mirror of
https://github.com/git/git.git
synced 2024-10-30 13:57:54 +01:00
5085aef4c8
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
3205 lines
86 KiB
C
3205 lines
86 KiB
C
#include "../cache.h"
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#include "../config.h"
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#include "../refs.h"
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#include "refs-internal.h"
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#include "ref-cache.h"
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#include "packed-backend.h"
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#include "../iterator.h"
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#include "../dir-iterator.h"
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#include "../lockfile.h"
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#include "../object.h"
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#include "../dir.h"
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#include "../chdir-notify.h"
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#include "worktree.h"
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/*
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* This backend uses the following flags in `ref_update::flags` for
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* internal bookkeeping purposes. Their numerical values must not
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* conflict with REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, REF_HAVE_NEW,
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* REF_HAVE_OLD, or REF_IS_PRUNING, which are also stored in
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* `ref_update::flags`.
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*/
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/*
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* Used as a flag in ref_update::flags when a loose ref is being
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* pruned. This flag must only be used when REF_NO_DEREF is set.
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*/
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#define REF_IS_PRUNING (1 << 4)
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/*
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* Flag passed to lock_ref_sha1_basic() telling it to tolerate broken
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* refs (i.e., because the reference is about to be deleted anyway).
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*/
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#define REF_DELETING (1 << 5)
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/*
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* Used as a flag in ref_update::flags when the lockfile needs to be
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* committed.
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*/
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#define REF_NEEDS_COMMIT (1 << 6)
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/*
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* Used as a flag in ref_update::flags when we want to log a ref
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* update but not actually perform it. This is used when a symbolic
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* ref update is split up.
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*/
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#define REF_LOG_ONLY (1 << 7)
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/*
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* Used as a flag in ref_update::flags when the ref_update was via an
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* update to HEAD.
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*/
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#define REF_UPDATE_VIA_HEAD (1 << 8)
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/*
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* Used as a flag in ref_update::flags when the loose reference has
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* been deleted.
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*/
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#define REF_DELETED_LOOSE (1 << 9)
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struct ref_lock {
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char *ref_name;
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struct lock_file lk;
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struct object_id old_oid;
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};
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struct files_ref_store {
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struct ref_store base;
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unsigned int store_flags;
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char *gitcommondir;
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struct ref_cache *loose;
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struct ref_store *packed_ref_store;
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};
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static void clear_loose_ref_cache(struct files_ref_store *refs)
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{
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if (refs->loose) {
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free_ref_cache(refs->loose);
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refs->loose = NULL;
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}
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}
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/*
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* Create a new submodule ref cache and add it to the internal
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* set of caches.
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*/
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static struct ref_store *files_ref_store_create(const char *gitdir,
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unsigned int flags)
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{
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struct files_ref_store *refs = xcalloc(1, sizeof(*refs));
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struct ref_store *ref_store = (struct ref_store *)refs;
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struct strbuf sb = STRBUF_INIT;
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ref_store->gitdir = xstrdup(gitdir);
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base_ref_store_init(ref_store, &refs_be_files);
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refs->store_flags = flags;
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get_common_dir_noenv(&sb, gitdir);
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refs->gitcommondir = strbuf_detach(&sb, NULL);
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strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir);
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refs->packed_ref_store = packed_ref_store_create(sb.buf, flags);
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strbuf_release(&sb);
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chdir_notify_reparent("files-backend $GIT_DIR", &refs->base.gitdir);
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chdir_notify_reparent("files-backend $GIT_COMMONDIR",
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&refs->gitcommondir);
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return ref_store;
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}
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/*
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* Die if refs is not the main ref store. caller is used in any
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* necessary error messages.
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*/
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static void files_assert_main_repository(struct files_ref_store *refs,
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const char *caller)
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{
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if (refs->store_flags & REF_STORE_MAIN)
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return;
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BUG("operation %s only allowed for main ref store", caller);
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}
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/*
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* Downcast ref_store to files_ref_store. Die if ref_store is not a
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* files_ref_store. required_flags is compared with ref_store's
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* store_flags to ensure the ref_store has all required capabilities.
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* "caller" is used in any necessary error messages.
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*/
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static struct files_ref_store *files_downcast(struct ref_store *ref_store,
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unsigned int required_flags,
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const char *caller)
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{
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struct files_ref_store *refs;
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if (ref_store->be != &refs_be_files)
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BUG("ref_store is type \"%s\" not \"files\" in %s",
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ref_store->be->name, caller);
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refs = (struct files_ref_store *)ref_store;
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if ((refs->store_flags & required_flags) != required_flags)
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BUG("operation %s requires abilities 0x%x, but only have 0x%x",
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caller, required_flags, refs->store_flags);
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return refs;
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}
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static void files_reflog_path_other_worktrees(struct files_ref_store *refs,
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struct strbuf *sb,
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const char *refname)
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{
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const char *real_ref;
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const char *worktree_name;
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int length;
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if (parse_worktree_ref(refname, &worktree_name, &length, &real_ref))
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BUG("refname %s is not a other-worktree ref", refname);
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if (worktree_name)
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strbuf_addf(sb, "%s/worktrees/%.*s/logs/%s", refs->gitcommondir,
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length, worktree_name, real_ref);
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else
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strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir,
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real_ref);
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}
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static void files_reflog_path(struct files_ref_store *refs,
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struct strbuf *sb,
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const char *refname)
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{
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switch (ref_type(refname)) {
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case REF_TYPE_PER_WORKTREE:
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case REF_TYPE_PSEUDOREF:
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strbuf_addf(sb, "%s/logs/%s", refs->base.gitdir, refname);
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break;
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case REF_TYPE_OTHER_PSEUDOREF:
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case REF_TYPE_MAIN_PSEUDOREF:
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files_reflog_path_other_worktrees(refs, sb, refname);
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break;
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case REF_TYPE_NORMAL:
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strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname);
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break;
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default:
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BUG("unknown ref type %d of ref %s",
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ref_type(refname), refname);
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}
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}
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static void files_ref_path(struct files_ref_store *refs,
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struct strbuf *sb,
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const char *refname)
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{
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switch (ref_type(refname)) {
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case REF_TYPE_PER_WORKTREE:
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case REF_TYPE_PSEUDOREF:
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strbuf_addf(sb, "%s/%s", refs->base.gitdir, refname);
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break;
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case REF_TYPE_MAIN_PSEUDOREF:
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if (!skip_prefix(refname, "main-worktree/", &refname))
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BUG("ref %s is not a main pseudoref", refname);
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/* fallthrough */
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case REF_TYPE_OTHER_PSEUDOREF:
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case REF_TYPE_NORMAL:
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strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname);
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break;
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default:
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BUG("unknown ref type %d of ref %s",
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ref_type(refname), refname);
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}
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}
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/*
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* Manually add refs/bisect, refs/rewritten and refs/worktree, which, being
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* per-worktree, might not appear in the directory listing for
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* refs/ in the main repo.
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*/
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static void add_per_worktree_entries_to_dir(struct ref_dir *dir, const char *dirname)
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{
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const char *prefixes[] = { "refs/bisect/", "refs/worktree/", "refs/rewritten/" };
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int ip;
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if (strcmp(dirname, "refs/"))
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return;
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for (ip = 0; ip < ARRAY_SIZE(prefixes); ip++) {
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const char *prefix = prefixes[ip];
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int prefix_len = strlen(prefix);
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struct ref_entry *child_entry;
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int pos;
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pos = search_ref_dir(dir, prefix, prefix_len);
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if (pos >= 0)
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continue;
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child_entry = create_dir_entry(dir->cache, prefix, prefix_len, 1);
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add_entry_to_dir(dir, child_entry);
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}
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}
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/*
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* Read the loose references from the namespace dirname into dir
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* (without recursing). dirname must end with '/'. dir must be the
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* directory entry corresponding to dirname.
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*/
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static void loose_fill_ref_dir(struct ref_store *ref_store,
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struct ref_dir *dir, const char *dirname)
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{
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struct files_ref_store *refs =
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files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir");
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DIR *d;
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struct dirent *de;
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int dirnamelen = strlen(dirname);
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struct strbuf refname;
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struct strbuf path = STRBUF_INIT;
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size_t path_baselen;
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files_ref_path(refs, &path, dirname);
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path_baselen = path.len;
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d = opendir(path.buf);
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if (!d) {
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strbuf_release(&path);
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return;
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}
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strbuf_init(&refname, dirnamelen + 257);
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strbuf_add(&refname, dirname, dirnamelen);
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while ((de = readdir(d)) != NULL) {
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struct object_id oid;
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struct stat st;
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int flag;
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if (de->d_name[0] == '.')
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continue;
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if (ends_with(de->d_name, ".lock"))
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continue;
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strbuf_addstr(&refname, de->d_name);
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strbuf_addstr(&path, de->d_name);
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if (stat(path.buf, &st) < 0) {
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; /* silently ignore */
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} else if (S_ISDIR(st.st_mode)) {
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strbuf_addch(&refname, '/');
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add_entry_to_dir(dir,
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create_dir_entry(dir->cache, refname.buf,
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refname.len, 1));
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} else {
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if (!refs_resolve_ref_unsafe(&refs->base,
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refname.buf,
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RESOLVE_REF_READING,
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&oid, &flag)) {
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oidclr(&oid);
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flag |= REF_ISBROKEN;
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} else if (is_null_oid(&oid)) {
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/*
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* It is so astronomically unlikely
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* that null_oid is the OID of an
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* actual object that we consider its
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* appearance in a loose reference
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* file to be repo corruption
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* (probably due to a software bug).
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*/
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flag |= REF_ISBROKEN;
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}
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if (check_refname_format(refname.buf,
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REFNAME_ALLOW_ONELEVEL)) {
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if (!refname_is_safe(refname.buf))
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die("loose refname is dangerous: %s", refname.buf);
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oidclr(&oid);
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flag |= REF_BAD_NAME | REF_ISBROKEN;
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}
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add_entry_to_dir(dir,
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create_ref_entry(refname.buf, &oid, flag));
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}
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strbuf_setlen(&refname, dirnamelen);
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strbuf_setlen(&path, path_baselen);
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}
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strbuf_release(&refname);
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strbuf_release(&path);
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closedir(d);
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add_per_worktree_entries_to_dir(dir, dirname);
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}
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static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs)
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{
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if (!refs->loose) {
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/*
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* Mark the top-level directory complete because we
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* are about to read the only subdirectory that can
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* hold references:
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*/
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refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir);
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/* We're going to fill the top level ourselves: */
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refs->loose->root->flag &= ~REF_INCOMPLETE;
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/*
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* Add an incomplete entry for "refs/" (to be filled
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* lazily):
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*/
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add_entry_to_dir(get_ref_dir(refs->loose->root),
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create_dir_entry(refs->loose, "refs/", 5, 1));
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}
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return refs->loose;
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}
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static int files_read_raw_ref(struct ref_store *ref_store,
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const char *refname, struct object_id *oid,
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struct strbuf *referent, unsigned int *type)
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{
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struct files_ref_store *refs =
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files_downcast(ref_store, REF_STORE_READ, "read_raw_ref");
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struct strbuf sb_contents = STRBUF_INIT;
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struct strbuf sb_path = STRBUF_INIT;
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const char *path;
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const char *buf;
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struct stat st;
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int fd;
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int ret = -1;
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int save_errno;
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int remaining_retries = 3;
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*type = 0;
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strbuf_reset(&sb_path);
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files_ref_path(refs, &sb_path, refname);
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path = sb_path.buf;
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stat_ref:
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/*
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* We might have to loop back here to avoid a race
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* condition: first we lstat() the file, then we try
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* to read it as a link or as a file. But if somebody
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* changes the type of the file (file <-> directory
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* <-> symlink) between the lstat() and reading, then
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* we don't want to report that as an error but rather
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* try again starting with the lstat().
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*
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* We'll keep a count of the retries, though, just to avoid
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* any confusing situation sending us into an infinite loop.
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*/
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if (remaining_retries-- <= 0)
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goto out;
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if (lstat(path, &st) < 0) {
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if (errno != ENOENT)
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goto out;
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if (refs_read_raw_ref(refs->packed_ref_store, refname,
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oid, referent, type)) {
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errno = ENOENT;
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goto out;
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}
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ret = 0;
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goto out;
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}
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|
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/* Follow "normalized" - ie "refs/.." symlinks by hand */
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if (S_ISLNK(st.st_mode)) {
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strbuf_reset(&sb_contents);
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if (strbuf_readlink(&sb_contents, path, st.st_size) < 0) {
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if (errno == ENOENT || errno == EINVAL)
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/* inconsistent with lstat; retry */
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goto stat_ref;
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else
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goto out;
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}
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if (starts_with(sb_contents.buf, "refs/") &&
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!check_refname_format(sb_contents.buf, 0)) {
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strbuf_swap(&sb_contents, referent);
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*type |= REF_ISSYMREF;
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ret = 0;
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goto out;
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}
|
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/*
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* It doesn't look like a refname; fall through to just
|
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* treating it like a non-symlink, and reading whatever it
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* points to.
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*/
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}
|
|
|
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/* Is it a directory? */
|
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if (S_ISDIR(st.st_mode)) {
|
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/*
|
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* Even though there is a directory where the loose
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* ref is supposed to be, there could still be a
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* packed ref:
|
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*/
|
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if (refs_read_raw_ref(refs->packed_ref_store, refname,
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oid, referent, type)) {
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errno = EISDIR;
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goto out;
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|
}
|
|
ret = 0;
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|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Anything else, just open it and try to use it as
|
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* a ref
|
|
*/
|
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fd = open(path, O_RDONLY);
|
|
if (fd < 0) {
|
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if (errno == ENOENT && !S_ISLNK(st.st_mode))
|
|
/* inconsistent with lstat; retry */
|
|
goto stat_ref;
|
|
else
|
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goto out;
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}
|
|
strbuf_reset(&sb_contents);
|
|
if (strbuf_read(&sb_contents, fd, 256) < 0) {
|
|
int save_errno = errno;
|
|
close(fd);
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errno = save_errno;
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goto out;
|
|
}
|
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close(fd);
|
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strbuf_rtrim(&sb_contents);
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buf = sb_contents.buf;
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|
|
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ret = parse_loose_ref_contents(buf, oid, referent, type);
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|
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out:
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save_errno = errno;
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strbuf_release(&sb_path);
|
|
strbuf_release(&sb_contents);
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errno = save_errno;
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return ret;
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|
}
|
|
|
|
int parse_loose_ref_contents(const char *buf, struct object_id *oid,
|
|
struct strbuf *referent, unsigned int *type)
|
|
{
|
|
const char *p;
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if (skip_prefix(buf, "ref:", &buf)) {
|
|
while (isspace(*buf))
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buf++;
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|
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strbuf_reset(referent);
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|
strbuf_addstr(referent, buf);
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*type |= REF_ISSYMREF;
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return 0;
|
|
}
|
|
|
|
/*
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|
* FETCH_HEAD has additional data after the sha.
|
|
*/
|
|
if (parse_oid_hex(buf, oid, &p) ||
|
|
(*p != '\0' && !isspace(*p))) {
|
|
*type |= REF_ISBROKEN;
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
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return 0;
|
|
}
|
|
|
|
static void unlock_ref(struct ref_lock *lock)
|
|
{
|
|
rollback_lock_file(&lock->lk);
|
|
free(lock->ref_name);
|
|
free(lock);
|
|
}
|
|
|
|
/*
|
|
* Lock refname, without following symrefs, and set *lock_p to point
|
|
* at a newly-allocated lock object. Fill in lock->old_oid, referent,
|
|
* and type similarly to read_raw_ref().
|
|
*
|
|
* The caller must verify that refname is a "safe" reference name (in
|
|
* the sense of refname_is_safe()) before calling this function.
|
|
*
|
|
* If the reference doesn't already exist, verify that refname doesn't
|
|
* have a D/F conflict with any existing references. extras and skip
|
|
* are passed to refs_verify_refname_available() for this check.
|
|
*
|
|
* If mustexist is not set and the reference is not found or is
|
|
* broken, lock the reference anyway but clear old_oid.
|
|
*
|
|
* Return 0 on success. On failure, write an error message to err and
|
|
* return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR.
|
|
*
|
|
* Implementation note: This function is basically
|
|
*
|
|
* lock reference
|
|
* read_raw_ref()
|
|
*
|
|
* but it includes a lot more code to
|
|
* - Deal with possible races with other processes
|
|
* - Avoid calling refs_verify_refname_available() when it can be
|
|
* avoided, namely if we were successfully able to read the ref
|
|
* - Generate informative error messages in the case of failure
|
|
*/
|
|
static int lock_raw_ref(struct files_ref_store *refs,
|
|
const char *refname, int mustexist,
|
|
const struct string_list *extras,
|
|
const struct string_list *skip,
|
|
struct ref_lock **lock_p,
|
|
struct strbuf *referent,
|
|
unsigned int *type,
|
|
struct strbuf *err)
|
|
{
|
|
struct ref_lock *lock;
|
|
struct strbuf ref_file = STRBUF_INIT;
|
|
int attempts_remaining = 3;
|
|
int ret = TRANSACTION_GENERIC_ERROR;
|
|
|
|
assert(err);
|
|
files_assert_main_repository(refs, "lock_raw_ref");
|
|
|
|
*type = 0;
|
|
|
|
/* First lock the file so it can't change out from under us. */
|
|
|
|
*lock_p = lock = xcalloc(1, sizeof(*lock));
|
|
|
|
lock->ref_name = xstrdup(refname);
|
|
files_ref_path(refs, &ref_file, refname);
|
|
|
|
retry:
|
|
switch (safe_create_leading_directories(ref_file.buf)) {
|
|
case SCLD_OK:
|
|
break; /* success */
|
|
case SCLD_EXISTS:
|
|
/*
|
|
* Suppose refname is "refs/foo/bar". We just failed
|
|
* to create the containing directory, "refs/foo",
|
|
* because there was a non-directory in the way. This
|
|
* indicates a D/F conflict, probably because of
|
|
* another reference such as "refs/foo". There is no
|
|
* reason to expect this error to be transitory.
|
|
*/
|
|
if (refs_verify_refname_available(&refs->base, refname,
|
|
extras, skip, err)) {
|
|
if (mustexist) {
|
|
/*
|
|
* To the user the relevant error is
|
|
* that the "mustexist" reference is
|
|
* missing:
|
|
*/
|
|
strbuf_reset(err);
|
|
strbuf_addf(err, "unable to resolve reference '%s'",
|
|
refname);
|
|
} else {
|
|
/*
|
|
* The error message set by
|
|
* refs_verify_refname_available() is
|
|
* OK.
|
|
*/
|
|
ret = TRANSACTION_NAME_CONFLICT;
|
|
}
|
|
} else {
|
|
/*
|
|
* The file that is in the way isn't a loose
|
|
* reference. Report it as a low-level
|
|
* failure.
|
|
*/
|
|
strbuf_addf(err, "unable to create lock file %s.lock; "
|
|
"non-directory in the way",
|
|
ref_file.buf);
|
|
}
|
|
goto error_return;
|
|
case SCLD_VANISHED:
|
|
/* Maybe another process was tidying up. Try again. */
|
|
if (--attempts_remaining > 0)
|
|
goto retry;
|
|
/* fall through */
|
|
default:
|
|
strbuf_addf(err, "unable to create directory for %s",
|
|
ref_file.buf);
|
|
goto error_return;
|
|
}
|
|
|
|
if (hold_lock_file_for_update_timeout(
|
|
&lock->lk, ref_file.buf, LOCK_NO_DEREF,
|
|
get_files_ref_lock_timeout_ms()) < 0) {
|
|
if (errno == ENOENT && --attempts_remaining > 0) {
|
|
/*
|
|
* Maybe somebody just deleted one of the
|
|
* directories leading to ref_file. Try
|
|
* again:
|
|
*/
|
|
goto retry;
|
|
} else {
|
|
unable_to_lock_message(ref_file.buf, errno, err);
|
|
goto error_return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now we hold the lock and can read the reference without
|
|
* fear that its value will change.
|
|
*/
|
|
|
|
if (files_read_raw_ref(&refs->base, refname,
|
|
&lock->old_oid, referent, type)) {
|
|
if (errno == ENOENT) {
|
|
if (mustexist) {
|
|
/* Garden variety missing reference. */
|
|
strbuf_addf(err, "unable to resolve reference '%s'",
|
|
refname);
|
|
goto error_return;
|
|
} else {
|
|
/*
|
|
* Reference is missing, but that's OK. We
|
|
* know that there is not a conflict with
|
|
* another loose reference because
|
|
* (supposing that we are trying to lock
|
|
* reference "refs/foo/bar"):
|
|
*
|
|
* - We were successfully able to create
|
|
* the lockfile refs/foo/bar.lock, so we
|
|
* know there cannot be a loose reference
|
|
* named "refs/foo".
|
|
*
|
|
* - We got ENOENT and not EISDIR, so we
|
|
* know that there cannot be a loose
|
|
* reference named "refs/foo/bar/baz".
|
|
*/
|
|
}
|
|
} else if (errno == EISDIR) {
|
|
/*
|
|
* There is a directory in the way. It might have
|
|
* contained references that have been deleted. If
|
|
* we don't require that the reference already
|
|
* exists, try to remove the directory so that it
|
|
* doesn't cause trouble when we want to rename the
|
|
* lockfile into place later.
|
|
*/
|
|
if (mustexist) {
|
|
/* Garden variety missing reference. */
|
|
strbuf_addf(err, "unable to resolve reference '%s'",
|
|
refname);
|
|
goto error_return;
|
|
} else if (remove_dir_recursively(&ref_file,
|
|
REMOVE_DIR_EMPTY_ONLY)) {
|
|
if (refs_verify_refname_available(
|
|
&refs->base, refname,
|
|
extras, skip, err)) {
|
|
/*
|
|
* The error message set by
|
|
* verify_refname_available() is OK.
|
|
*/
|
|
ret = TRANSACTION_NAME_CONFLICT;
|
|
goto error_return;
|
|
} else {
|
|
/*
|
|
* We can't delete the directory,
|
|
* but we also don't know of any
|
|
* references that it should
|
|
* contain.
|
|
*/
|
|
strbuf_addf(err, "there is a non-empty directory '%s' "
|
|
"blocking reference '%s'",
|
|
ref_file.buf, refname);
|
|
goto error_return;
|
|
}
|
|
}
|
|
} else if (errno == EINVAL && (*type & REF_ISBROKEN)) {
|
|
strbuf_addf(err, "unable to resolve reference '%s': "
|
|
"reference broken", refname);
|
|
goto error_return;
|
|
} else {
|
|
strbuf_addf(err, "unable to resolve reference '%s': %s",
|
|
refname, strerror(errno));
|
|
goto error_return;
|
|
}
|
|
|
|
/*
|
|
* If the ref did not exist and we are creating it,
|
|
* make sure there is no existing packed ref that
|
|
* conflicts with refname:
|
|
*/
|
|
if (refs_verify_refname_available(
|
|
refs->packed_ref_store, refname,
|
|
extras, skip, err))
|
|
goto error_return;
|
|
}
|
|
|
|
ret = 0;
|
|
goto out;
|
|
|
|
error_return:
|
|
unlock_ref(lock);
|
|
*lock_p = NULL;
|
|
|
|
out:
|
|
strbuf_release(&ref_file);
|
|
return ret;
|
|
}
|
|
|
|
struct files_ref_iterator {
|
|
struct ref_iterator base;
|
|
|
|
struct ref_iterator *iter0;
|
|
unsigned int flags;
|
|
};
|
|
|
|
static int files_ref_iterator_advance(struct ref_iterator *ref_iterator)
|
|
{
|
|
struct files_ref_iterator *iter =
|
|
(struct files_ref_iterator *)ref_iterator;
|
|
int ok;
|
|
|
|
while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) {
|
|
if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY &&
|
|
ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE)
|
|
continue;
|
|
|
|
if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
|
|
!ref_resolves_to_object(iter->iter0->refname,
|
|
iter->iter0->oid,
|
|
iter->iter0->flags))
|
|
continue;
|
|
|
|
iter->base.refname = iter->iter0->refname;
|
|
iter->base.oid = iter->iter0->oid;
|
|
iter->base.flags = iter->iter0->flags;
|
|
return ITER_OK;
|
|
}
|
|
|
|
iter->iter0 = NULL;
|
|
if (ref_iterator_abort(ref_iterator) != ITER_DONE)
|
|
ok = ITER_ERROR;
|
|
|
|
return ok;
|
|
}
|
|
|
|
static int files_ref_iterator_peel(struct ref_iterator *ref_iterator,
|
|
struct object_id *peeled)
|
|
{
|
|
struct files_ref_iterator *iter =
|
|
(struct files_ref_iterator *)ref_iterator;
|
|
|
|
return ref_iterator_peel(iter->iter0, peeled);
|
|
}
|
|
|
|
static int files_ref_iterator_abort(struct ref_iterator *ref_iterator)
|
|
{
|
|
struct files_ref_iterator *iter =
|
|
(struct files_ref_iterator *)ref_iterator;
|
|
int ok = ITER_DONE;
|
|
|
|
if (iter->iter0)
|
|
ok = ref_iterator_abort(iter->iter0);
|
|
|
|
base_ref_iterator_free(ref_iterator);
|
|
return ok;
|
|
}
|
|
|
|
static struct ref_iterator_vtable files_ref_iterator_vtable = {
|
|
files_ref_iterator_advance,
|
|
files_ref_iterator_peel,
|
|
files_ref_iterator_abort
|
|
};
|
|
|
|
static struct ref_iterator *files_ref_iterator_begin(
|
|
struct ref_store *ref_store,
|
|
const char *prefix, unsigned int flags)
|
|
{
|
|
struct files_ref_store *refs;
|
|
struct ref_iterator *loose_iter, *packed_iter, *overlay_iter;
|
|
struct files_ref_iterator *iter;
|
|
struct ref_iterator *ref_iterator;
|
|
unsigned int required_flags = REF_STORE_READ;
|
|
|
|
if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN))
|
|
required_flags |= REF_STORE_ODB;
|
|
|
|
refs = files_downcast(ref_store, required_flags, "ref_iterator_begin");
|
|
|
|
/*
|
|
* We must make sure that all loose refs are read before
|
|
* accessing the packed-refs file; this avoids a race
|
|
* condition if loose refs are migrated to the packed-refs
|
|
* file by a simultaneous process, but our in-memory view is
|
|
* from before the migration. We ensure this as follows:
|
|
* First, we call start the loose refs iteration with its
|
|
* `prime_ref` argument set to true. This causes the loose
|
|
* references in the subtree to be pre-read into the cache.
|
|
* (If they've already been read, that's OK; we only need to
|
|
* guarantee that they're read before the packed refs, not
|
|
* *how much* before.) After that, we call
|
|
* packed_ref_iterator_begin(), which internally checks
|
|
* whether the packed-ref cache is up to date with what is on
|
|
* disk, and re-reads it if not.
|
|
*/
|
|
|
|
loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs),
|
|
prefix, 1);
|
|
|
|
/*
|
|
* The packed-refs file might contain broken references, for
|
|
* example an old version of a reference that points at an
|
|
* object that has since been garbage-collected. This is OK as
|
|
* long as there is a corresponding loose reference that
|
|
* overrides it, and we don't want to emit an error message in
|
|
* this case. So ask the packed_ref_store for all of its
|
|
* references, and (if needed) do our own check for broken
|
|
* ones in files_ref_iterator_advance(), after we have merged
|
|
* the packed and loose references.
|
|
*/
|
|
packed_iter = refs_ref_iterator_begin(
|
|
refs->packed_ref_store, prefix, 0,
|
|
DO_FOR_EACH_INCLUDE_BROKEN);
|
|
|
|
overlay_iter = overlay_ref_iterator_begin(loose_iter, packed_iter);
|
|
|
|
iter = xcalloc(1, sizeof(*iter));
|
|
ref_iterator = &iter->base;
|
|
base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable,
|
|
overlay_iter->ordered);
|
|
iter->iter0 = overlay_iter;
|
|
iter->flags = flags;
|
|
|
|
return ref_iterator;
|
|
}
|
|
|
|
/*
|
|
* Verify that the reference locked by lock has the value old_oid
|
|
* (unless it is NULL). Fail if the reference doesn't exist and
|
|
* mustexist is set. Return 0 on success. On error, write an error
|
|
* message to err, set errno, and return a negative value.
|
|
*/
|
|
static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock,
|
|
const struct object_id *old_oid, int mustexist,
|
|
struct strbuf *err)
|
|
{
|
|
assert(err);
|
|
|
|
if (refs_read_ref_full(ref_store, lock->ref_name,
|
|
mustexist ? RESOLVE_REF_READING : 0,
|
|
&lock->old_oid, NULL)) {
|
|
if (old_oid) {
|
|
int save_errno = errno;
|
|
strbuf_addf(err, "can't verify ref '%s'", lock->ref_name);
|
|
errno = save_errno;
|
|
return -1;
|
|
} else {
|
|
oidclr(&lock->old_oid);
|
|
return 0;
|
|
}
|
|
}
|
|
if (old_oid && !oideq(&lock->old_oid, old_oid)) {
|
|
strbuf_addf(err, "ref '%s' is at %s but expected %s",
|
|
lock->ref_name,
|
|
oid_to_hex(&lock->old_oid),
|
|
oid_to_hex(old_oid));
|
|
errno = EBUSY;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int remove_empty_directories(struct strbuf *path)
|
|
{
|
|
/*
|
|
* we want to create a file but there is a directory there;
|
|
* if that is an empty directory (or a directory that contains
|
|
* only empty directories), remove them.
|
|
*/
|
|
return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY);
|
|
}
|
|
|
|
static int create_reflock(const char *path, void *cb)
|
|
{
|
|
struct lock_file *lk = cb;
|
|
|
|
return hold_lock_file_for_update_timeout(
|
|
lk, path, LOCK_NO_DEREF,
|
|
get_files_ref_lock_timeout_ms()) < 0 ? -1 : 0;
|
|
}
|
|
|
|
/*
|
|
* Locks a ref returning the lock on success and NULL on failure.
|
|
* On failure errno is set to something meaningful.
|
|
*/
|
|
static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs,
|
|
const char *refname,
|
|
const struct object_id *old_oid,
|
|
const struct string_list *extras,
|
|
const struct string_list *skip,
|
|
unsigned int flags, int *type,
|
|
struct strbuf *err)
|
|
{
|
|
struct strbuf ref_file = STRBUF_INIT;
|
|
struct ref_lock *lock;
|
|
int last_errno = 0;
|
|
int mustexist = (old_oid && !is_null_oid(old_oid));
|
|
int resolve_flags = RESOLVE_REF_NO_RECURSE;
|
|
int resolved;
|
|
|
|
files_assert_main_repository(refs, "lock_ref_oid_basic");
|
|
assert(err);
|
|
|
|
lock = xcalloc(1, sizeof(struct ref_lock));
|
|
|
|
if (mustexist)
|
|
resolve_flags |= RESOLVE_REF_READING;
|
|
if (flags & REF_DELETING)
|
|
resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME;
|
|
|
|
files_ref_path(refs, &ref_file, refname);
|
|
resolved = !!refs_resolve_ref_unsafe(&refs->base,
|
|
refname, resolve_flags,
|
|
&lock->old_oid, type);
|
|
if (!resolved && errno == EISDIR) {
|
|
/*
|
|
* we are trying to lock foo but we used to
|
|
* have foo/bar which now does not exist;
|
|
* it is normal for the empty directory 'foo'
|
|
* to remain.
|
|
*/
|
|
if (remove_empty_directories(&ref_file)) {
|
|
last_errno = errno;
|
|
if (!refs_verify_refname_available(
|
|
&refs->base,
|
|
refname, extras, skip, err))
|
|
strbuf_addf(err, "there are still refs under '%s'",
|
|
refname);
|
|
goto error_return;
|
|
}
|
|
resolved = !!refs_resolve_ref_unsafe(&refs->base,
|
|
refname, resolve_flags,
|
|
&lock->old_oid, type);
|
|
}
|
|
if (!resolved) {
|
|
last_errno = errno;
|
|
if (last_errno != ENOTDIR ||
|
|
!refs_verify_refname_available(&refs->base, refname,
|
|
extras, skip, err))
|
|
strbuf_addf(err, "unable to resolve reference '%s': %s",
|
|
refname, strerror(last_errno));
|
|
|
|
goto error_return;
|
|
}
|
|
|
|
/*
|
|
* If the ref did not exist and we are creating it, make sure
|
|
* there is no existing packed ref whose name begins with our
|
|
* refname, nor a packed ref whose name is a proper prefix of
|
|
* our refname.
|
|
*/
|
|
if (is_null_oid(&lock->old_oid) &&
|
|
refs_verify_refname_available(refs->packed_ref_store, refname,
|
|
extras, skip, err)) {
|
|
last_errno = ENOTDIR;
|
|
goto error_return;
|
|
}
|
|
|
|
lock->ref_name = xstrdup(refname);
|
|
|
|
if (raceproof_create_file(ref_file.buf, create_reflock, &lock->lk)) {
|
|
last_errno = errno;
|
|
unable_to_lock_message(ref_file.buf, errno, err);
|
|
goto error_return;
|
|
}
|
|
|
|
if (verify_lock(&refs->base, lock, old_oid, mustexist, err)) {
|
|
last_errno = errno;
|
|
goto error_return;
|
|
}
|
|
goto out;
|
|
|
|
error_return:
|
|
unlock_ref(lock);
|
|
lock = NULL;
|
|
|
|
out:
|
|
strbuf_release(&ref_file);
|
|
errno = last_errno;
|
|
return lock;
|
|
}
|
|
|
|
struct ref_to_prune {
|
|
struct ref_to_prune *next;
|
|
struct object_id oid;
|
|
char name[FLEX_ARRAY];
|
|
};
|
|
|
|
enum {
|
|
REMOVE_EMPTY_PARENTS_REF = 0x01,
|
|
REMOVE_EMPTY_PARENTS_REFLOG = 0x02
|
|
};
|
|
|
|
/*
|
|
* Remove empty parent directories associated with the specified
|
|
* reference and/or its reflog, but spare [logs/]refs/ and immediate
|
|
* subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or
|
|
* REMOVE_EMPTY_PARENTS_REFLOG.
|
|
*/
|
|
static void try_remove_empty_parents(struct files_ref_store *refs,
|
|
const char *refname,
|
|
unsigned int flags)
|
|
{
|
|
struct strbuf buf = STRBUF_INIT;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
char *p, *q;
|
|
int i;
|
|
|
|
strbuf_addstr(&buf, refname);
|
|
p = buf.buf;
|
|
for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */
|
|
while (*p && *p != '/')
|
|
p++;
|
|
/* tolerate duplicate slashes; see check_refname_format() */
|
|
while (*p == '/')
|
|
p++;
|
|
}
|
|
q = buf.buf + buf.len;
|
|
while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) {
|
|
while (q > p && *q != '/')
|
|
q--;
|
|
while (q > p && *(q-1) == '/')
|
|
q--;
|
|
if (q == p)
|
|
break;
|
|
strbuf_setlen(&buf, q - buf.buf);
|
|
|
|
strbuf_reset(&sb);
|
|
files_ref_path(refs, &sb, buf.buf);
|
|
if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf))
|
|
flags &= ~REMOVE_EMPTY_PARENTS_REF;
|
|
|
|
strbuf_reset(&sb);
|
|
files_reflog_path(refs, &sb, buf.buf);
|
|
if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf))
|
|
flags &= ~REMOVE_EMPTY_PARENTS_REFLOG;
|
|
}
|
|
strbuf_release(&buf);
|
|
strbuf_release(&sb);
|
|
}
|
|
|
|
/* make sure nobody touched the ref, and unlink */
|
|
static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r)
|
|
{
|
|
struct ref_transaction *transaction;
|
|
struct strbuf err = STRBUF_INIT;
|
|
int ret = -1;
|
|
|
|
if (check_refname_format(r->name, 0))
|
|
return;
|
|
|
|
transaction = ref_store_transaction_begin(&refs->base, &err);
|
|
if (!transaction)
|
|
goto cleanup;
|
|
ref_transaction_add_update(
|
|
transaction, r->name,
|
|
REF_NO_DEREF | REF_HAVE_NEW | REF_HAVE_OLD | REF_IS_PRUNING,
|
|
&null_oid, &r->oid, NULL);
|
|
if (ref_transaction_commit(transaction, &err))
|
|
goto cleanup;
|
|
|
|
ret = 0;
|
|
|
|
cleanup:
|
|
if (ret)
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
ref_transaction_free(transaction);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Prune the loose versions of the references in the linked list
|
|
* `*refs_to_prune`, freeing the entries in the list as we go.
|
|
*/
|
|
static void prune_refs(struct files_ref_store *refs, struct ref_to_prune **refs_to_prune)
|
|
{
|
|
while (*refs_to_prune) {
|
|
struct ref_to_prune *r = *refs_to_prune;
|
|
*refs_to_prune = r->next;
|
|
prune_ref(refs, r);
|
|
free(r);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return true if the specified reference should be packed.
|
|
*/
|
|
static int should_pack_ref(const char *refname,
|
|
const struct object_id *oid, unsigned int ref_flags,
|
|
unsigned int pack_flags)
|
|
{
|
|
/* Do not pack per-worktree refs: */
|
|
if (ref_type(refname) != REF_TYPE_NORMAL)
|
|
return 0;
|
|
|
|
/* Do not pack non-tags unless PACK_REFS_ALL is set: */
|
|
if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/"))
|
|
return 0;
|
|
|
|
/* Do not pack symbolic refs: */
|
|
if (ref_flags & REF_ISSYMREF)
|
|
return 0;
|
|
|
|
/* Do not pack broken refs: */
|
|
if (!ref_resolves_to_object(refname, oid, ref_flags))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int files_pack_refs(struct ref_store *ref_store, unsigned int flags)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB,
|
|
"pack_refs");
|
|
struct ref_iterator *iter;
|
|
int ok;
|
|
struct ref_to_prune *refs_to_prune = NULL;
|
|
struct strbuf err = STRBUF_INIT;
|
|
struct ref_transaction *transaction;
|
|
|
|
transaction = ref_store_transaction_begin(refs->packed_ref_store, &err);
|
|
if (!transaction)
|
|
return -1;
|
|
|
|
packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err);
|
|
|
|
iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0);
|
|
while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
|
|
/*
|
|
* If the loose reference can be packed, add an entry
|
|
* in the packed ref cache. If the reference should be
|
|
* pruned, also add it to refs_to_prune.
|
|
*/
|
|
if (!should_pack_ref(iter->refname, iter->oid, iter->flags,
|
|
flags))
|
|
continue;
|
|
|
|
/*
|
|
* Add a reference creation for this reference to the
|
|
* packed-refs transaction:
|
|
*/
|
|
if (ref_transaction_update(transaction, iter->refname,
|
|
iter->oid, NULL,
|
|
REF_NO_DEREF, NULL, &err))
|
|
die("failure preparing to create packed reference %s: %s",
|
|
iter->refname, err.buf);
|
|
|
|
/* Schedule the loose reference for pruning if requested. */
|
|
if ((flags & PACK_REFS_PRUNE)) {
|
|
struct ref_to_prune *n;
|
|
FLEX_ALLOC_STR(n, name, iter->refname);
|
|
oidcpy(&n->oid, iter->oid);
|
|
n->next = refs_to_prune;
|
|
refs_to_prune = n;
|
|
}
|
|
}
|
|
if (ok != ITER_DONE)
|
|
die("error while iterating over references");
|
|
|
|
if (ref_transaction_commit(transaction, &err))
|
|
die("unable to write new packed-refs: %s", err.buf);
|
|
|
|
ref_transaction_free(transaction);
|
|
|
|
packed_refs_unlock(refs->packed_ref_store);
|
|
|
|
prune_refs(refs, &refs_to_prune);
|
|
strbuf_release(&err);
|
|
return 0;
|
|
}
|
|
|
|
static int files_delete_refs(struct ref_store *ref_store, const char *msg,
|
|
struct string_list *refnames, unsigned int flags)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE, "delete_refs");
|
|
struct strbuf err = STRBUF_INIT;
|
|
int i, result = 0;
|
|
|
|
if (!refnames->nr)
|
|
return 0;
|
|
|
|
if (packed_refs_lock(refs->packed_ref_store, 0, &err))
|
|
goto error;
|
|
|
|
if (refs_delete_refs(refs->packed_ref_store, msg, refnames, flags)) {
|
|
packed_refs_unlock(refs->packed_ref_store);
|
|
goto error;
|
|
}
|
|
|
|
packed_refs_unlock(refs->packed_ref_store);
|
|
|
|
for (i = 0; i < refnames->nr; i++) {
|
|
const char *refname = refnames->items[i].string;
|
|
|
|
if (refs_delete_ref(&refs->base, msg, refname, NULL, flags))
|
|
result |= error(_("could not remove reference %s"), refname);
|
|
}
|
|
|
|
strbuf_release(&err);
|
|
return result;
|
|
|
|
error:
|
|
/*
|
|
* If we failed to rewrite the packed-refs file, then it is
|
|
* unsafe to try to remove loose refs, because doing so might
|
|
* expose an obsolete packed value for a reference that might
|
|
* even point at an object that has been garbage collected.
|
|
*/
|
|
if (refnames->nr == 1)
|
|
error(_("could not delete reference %s: %s"),
|
|
refnames->items[0].string, err.buf);
|
|
else
|
|
error(_("could not delete references: %s"), err.buf);
|
|
|
|
strbuf_release(&err);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* People using contrib's git-new-workdir have .git/logs/refs ->
|
|
* /some/other/path/.git/logs/refs, and that may live on another device.
|
|
*
|
|
* IOW, to avoid cross device rename errors, the temporary renamed log must
|
|
* live into logs/refs.
|
|
*/
|
|
#define TMP_RENAMED_LOG "refs/.tmp-renamed-log"
|
|
|
|
struct rename_cb {
|
|
const char *tmp_renamed_log;
|
|
int true_errno;
|
|
};
|
|
|
|
static int rename_tmp_log_callback(const char *path, void *cb_data)
|
|
{
|
|
struct rename_cb *cb = cb_data;
|
|
|
|
if (rename(cb->tmp_renamed_log, path)) {
|
|
/*
|
|
* rename(a, b) when b is an existing directory ought
|
|
* to result in ISDIR, but Solaris 5.8 gives ENOTDIR.
|
|
* Sheesh. Record the true errno for error reporting,
|
|
* but report EISDIR to raceproof_create_file() so
|
|
* that it knows to retry.
|
|
*/
|
|
cb->true_errno = errno;
|
|
if (errno == ENOTDIR)
|
|
errno = EISDIR;
|
|
return -1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname)
|
|
{
|
|
struct strbuf path = STRBUF_INIT;
|
|
struct strbuf tmp = STRBUF_INIT;
|
|
struct rename_cb cb;
|
|
int ret;
|
|
|
|
files_reflog_path(refs, &path, newrefname);
|
|
files_reflog_path(refs, &tmp, TMP_RENAMED_LOG);
|
|
cb.tmp_renamed_log = tmp.buf;
|
|
ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb);
|
|
if (ret) {
|
|
if (errno == EISDIR)
|
|
error("directory not empty: %s", path.buf);
|
|
else
|
|
error("unable to move logfile %s to %s: %s",
|
|
tmp.buf, path.buf,
|
|
strerror(cb.true_errno));
|
|
}
|
|
|
|
strbuf_release(&path);
|
|
strbuf_release(&tmp);
|
|
return ret;
|
|
}
|
|
|
|
static int write_ref_to_lockfile(struct ref_lock *lock,
|
|
const struct object_id *oid, struct strbuf *err);
|
|
static int commit_ref_update(struct files_ref_store *refs,
|
|
struct ref_lock *lock,
|
|
const struct object_id *oid, const char *logmsg,
|
|
struct strbuf *err);
|
|
|
|
static int files_copy_or_rename_ref(struct ref_store *ref_store,
|
|
const char *oldrefname, const char *newrefname,
|
|
const char *logmsg, int copy)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE, "rename_ref");
|
|
struct object_id orig_oid;
|
|
int flag = 0, logmoved = 0;
|
|
struct ref_lock *lock;
|
|
struct stat loginfo;
|
|
struct strbuf sb_oldref = STRBUF_INIT;
|
|
struct strbuf sb_newref = STRBUF_INIT;
|
|
struct strbuf tmp_renamed_log = STRBUF_INIT;
|
|
int log, ret;
|
|
struct strbuf err = STRBUF_INIT;
|
|
|
|
files_reflog_path(refs, &sb_oldref, oldrefname);
|
|
files_reflog_path(refs, &sb_newref, newrefname);
|
|
files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG);
|
|
|
|
log = !lstat(sb_oldref.buf, &loginfo);
|
|
if (log && S_ISLNK(loginfo.st_mode)) {
|
|
ret = error("reflog for %s is a symlink", oldrefname);
|
|
goto out;
|
|
}
|
|
|
|
if (!refs_resolve_ref_unsafe(&refs->base, oldrefname,
|
|
RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
|
|
&orig_oid, &flag)) {
|
|
ret = error("refname %s not found", oldrefname);
|
|
goto out;
|
|
}
|
|
|
|
if (flag & REF_ISSYMREF) {
|
|
if (copy)
|
|
ret = error("refname %s is a symbolic ref, copying it is not supported",
|
|
oldrefname);
|
|
else
|
|
ret = error("refname %s is a symbolic ref, renaming it is not supported",
|
|
oldrefname);
|
|
goto out;
|
|
}
|
|
if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) {
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (!copy && log && rename(sb_oldref.buf, tmp_renamed_log.buf)) {
|
|
ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
if (copy && log && copy_file(tmp_renamed_log.buf, sb_oldref.buf, 0644)) {
|
|
ret = error("unable to copy logfile logs/%s to logs/"TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
goto out;
|
|
}
|
|
|
|
if (!copy && refs_delete_ref(&refs->base, logmsg, oldrefname,
|
|
&orig_oid, REF_NO_DEREF)) {
|
|
error("unable to delete old %s", oldrefname);
|
|
goto rollback;
|
|
}
|
|
|
|
/*
|
|
* Since we are doing a shallow lookup, oid is not the
|
|
* correct value to pass to delete_ref as old_oid. But that
|
|
* doesn't matter, because an old_oid check wouldn't add to
|
|
* the safety anyway; we want to delete the reference whatever
|
|
* its current value.
|
|
*/
|
|
if (!copy && !refs_read_ref_full(&refs->base, newrefname,
|
|
RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
|
|
NULL, NULL) &&
|
|
refs_delete_ref(&refs->base, NULL, newrefname,
|
|
NULL, REF_NO_DEREF)) {
|
|
if (errno == EISDIR) {
|
|
struct strbuf path = STRBUF_INIT;
|
|
int result;
|
|
|
|
files_ref_path(refs, &path, newrefname);
|
|
result = remove_empty_directories(&path);
|
|
strbuf_release(&path);
|
|
|
|
if (result) {
|
|
error("Directory not empty: %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
} else {
|
|
error("unable to delete existing %s", newrefname);
|
|
goto rollback;
|
|
}
|
|
}
|
|
|
|
if (log && rename_tmp_log(refs, newrefname))
|
|
goto rollback;
|
|
|
|
logmoved = log;
|
|
|
|
lock = lock_ref_oid_basic(refs, newrefname, NULL, NULL, NULL,
|
|
REF_NO_DEREF, NULL, &err);
|
|
if (!lock) {
|
|
if (copy)
|
|
error("unable to copy '%s' to '%s': %s", oldrefname, newrefname, err.buf);
|
|
else
|
|
error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf);
|
|
strbuf_release(&err);
|
|
goto rollback;
|
|
}
|
|
oidcpy(&lock->old_oid, &orig_oid);
|
|
|
|
if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
|
|
commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) {
|
|
error("unable to write current sha1 into %s: %s", newrefname, err.buf);
|
|
strbuf_release(&err);
|
|
goto rollback;
|
|
}
|
|
|
|
ret = 0;
|
|
goto out;
|
|
|
|
rollback:
|
|
lock = lock_ref_oid_basic(refs, oldrefname, NULL, NULL, NULL,
|
|
REF_NO_DEREF, NULL, &err);
|
|
if (!lock) {
|
|
error("unable to lock %s for rollback: %s", oldrefname, err.buf);
|
|
strbuf_release(&err);
|
|
goto rollbacklog;
|
|
}
|
|
|
|
flag = log_all_ref_updates;
|
|
log_all_ref_updates = LOG_REFS_NONE;
|
|
if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
|
|
commit_ref_update(refs, lock, &orig_oid, NULL, &err)) {
|
|
error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
|
|
strbuf_release(&err);
|
|
}
|
|
log_all_ref_updates = flag;
|
|
|
|
rollbacklog:
|
|
if (logmoved && rename(sb_newref.buf, sb_oldref.buf))
|
|
error("unable to restore logfile %s from %s: %s",
|
|
oldrefname, newrefname, strerror(errno));
|
|
if (!logmoved && log &&
|
|
rename(tmp_renamed_log.buf, sb_oldref.buf))
|
|
error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s",
|
|
oldrefname, strerror(errno));
|
|
ret = 1;
|
|
out:
|
|
strbuf_release(&sb_newref);
|
|
strbuf_release(&sb_oldref);
|
|
strbuf_release(&tmp_renamed_log);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int files_rename_ref(struct ref_store *ref_store,
|
|
const char *oldrefname, const char *newrefname,
|
|
const char *logmsg)
|
|
{
|
|
return files_copy_or_rename_ref(ref_store, oldrefname,
|
|
newrefname, logmsg, 0);
|
|
}
|
|
|
|
static int files_copy_ref(struct ref_store *ref_store,
|
|
const char *oldrefname, const char *newrefname,
|
|
const char *logmsg)
|
|
{
|
|
return files_copy_or_rename_ref(ref_store, oldrefname,
|
|
newrefname, logmsg, 1);
|
|
}
|
|
|
|
static int close_ref_gently(struct ref_lock *lock)
|
|
{
|
|
if (close_lock_file_gently(&lock->lk))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int commit_ref(struct ref_lock *lock)
|
|
{
|
|
char *path = get_locked_file_path(&lock->lk);
|
|
struct stat st;
|
|
|
|
if (!lstat(path, &st) && S_ISDIR(st.st_mode)) {
|
|
/*
|
|
* There is a directory at the path we want to rename
|
|
* the lockfile to. Hopefully it is empty; try to
|
|
* delete it.
|
|
*/
|
|
size_t len = strlen(path);
|
|
struct strbuf sb_path = STRBUF_INIT;
|
|
|
|
strbuf_attach(&sb_path, path, len, len);
|
|
|
|
/*
|
|
* If this fails, commit_lock_file() will also fail
|
|
* and will report the problem.
|
|
*/
|
|
remove_empty_directories(&sb_path);
|
|
strbuf_release(&sb_path);
|
|
} else {
|
|
free(path);
|
|
}
|
|
|
|
if (commit_lock_file(&lock->lk))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int open_or_create_logfile(const char *path, void *cb)
|
|
{
|
|
int *fd = cb;
|
|
|
|
*fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666);
|
|
return (*fd < 0) ? -1 : 0;
|
|
}
|
|
|
|
/*
|
|
* Create a reflog for a ref. If force_create = 0, only create the
|
|
* reflog for certain refs (those for which should_autocreate_reflog
|
|
* returns non-zero). Otherwise, create it regardless of the reference
|
|
* name. If the logfile already existed or was created, return 0 and
|
|
* set *logfd to the file descriptor opened for appending to the file.
|
|
* If no logfile exists and we decided not to create one, return 0 and
|
|
* set *logfd to -1. On failure, fill in *err, set *logfd to -1, and
|
|
* return -1.
|
|
*/
|
|
static int log_ref_setup(struct files_ref_store *refs,
|
|
const char *refname, int force_create,
|
|
int *logfd, struct strbuf *err)
|
|
{
|
|
struct strbuf logfile_sb = STRBUF_INIT;
|
|
char *logfile;
|
|
|
|
files_reflog_path(refs, &logfile_sb, refname);
|
|
logfile = strbuf_detach(&logfile_sb, NULL);
|
|
|
|
if (force_create || should_autocreate_reflog(refname)) {
|
|
if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) {
|
|
if (errno == ENOENT)
|
|
strbuf_addf(err, "unable to create directory for '%s': "
|
|
"%s", logfile, strerror(errno));
|
|
else if (errno == EISDIR)
|
|
strbuf_addf(err, "there are still logs under '%s'",
|
|
logfile);
|
|
else
|
|
strbuf_addf(err, "unable to append to '%s': %s",
|
|
logfile, strerror(errno));
|
|
|
|
goto error;
|
|
}
|
|
} else {
|
|
*logfd = open(logfile, O_APPEND | O_WRONLY, 0666);
|
|
if (*logfd < 0) {
|
|
if (errno == ENOENT || errno == EISDIR) {
|
|
/*
|
|
* The logfile doesn't already exist,
|
|
* but that is not an error; it only
|
|
* means that we won't write log
|
|
* entries to it.
|
|
*/
|
|
;
|
|
} else {
|
|
strbuf_addf(err, "unable to append to '%s': %s",
|
|
logfile, strerror(errno));
|
|
goto error;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (*logfd >= 0)
|
|
adjust_shared_perm(logfile);
|
|
|
|
free(logfile);
|
|
return 0;
|
|
|
|
error:
|
|
free(logfile);
|
|
return -1;
|
|
}
|
|
|
|
static int files_create_reflog(struct ref_store *ref_store,
|
|
const char *refname, int force_create,
|
|
struct strbuf *err)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE, "create_reflog");
|
|
int fd;
|
|
|
|
if (log_ref_setup(refs, refname, force_create, &fd, err))
|
|
return -1;
|
|
|
|
if (fd >= 0)
|
|
close(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int log_ref_write_fd(int fd, const struct object_id *old_oid,
|
|
const struct object_id *new_oid,
|
|
const char *committer, const char *msg)
|
|
{
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int ret = 0;
|
|
|
|
strbuf_addf(&sb, "%s %s %s", oid_to_hex(old_oid), oid_to_hex(new_oid), committer);
|
|
if (msg && *msg) {
|
|
strbuf_addch(&sb, '\t');
|
|
strbuf_addstr(&sb, msg);
|
|
}
|
|
strbuf_addch(&sb, '\n');
|
|
if (write_in_full(fd, sb.buf, sb.len) < 0)
|
|
ret = -1;
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
static int files_log_ref_write(struct files_ref_store *refs,
|
|
const char *refname, const struct object_id *old_oid,
|
|
const struct object_id *new_oid, const char *msg,
|
|
int flags, struct strbuf *err)
|
|
{
|
|
int logfd, result;
|
|
|
|
if (log_all_ref_updates == LOG_REFS_UNSET)
|
|
log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL;
|
|
|
|
result = log_ref_setup(refs, refname,
|
|
flags & REF_FORCE_CREATE_REFLOG,
|
|
&logfd, err);
|
|
|
|
if (result)
|
|
return result;
|
|
|
|
if (logfd < 0)
|
|
return 0;
|
|
result = log_ref_write_fd(logfd, old_oid, new_oid,
|
|
git_committer_info(0), msg);
|
|
if (result) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int save_errno = errno;
|
|
|
|
files_reflog_path(refs, &sb, refname);
|
|
strbuf_addf(err, "unable to append to '%s': %s",
|
|
sb.buf, strerror(save_errno));
|
|
strbuf_release(&sb);
|
|
close(logfd);
|
|
return -1;
|
|
}
|
|
if (close(logfd)) {
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int save_errno = errno;
|
|
|
|
files_reflog_path(refs, &sb, refname);
|
|
strbuf_addf(err, "unable to append to '%s': %s",
|
|
sb.buf, strerror(save_errno));
|
|
strbuf_release(&sb);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write oid into the open lockfile, then close the lockfile. On
|
|
* errors, rollback the lockfile, fill in *err and return -1.
|
|
*/
|
|
static int write_ref_to_lockfile(struct ref_lock *lock,
|
|
const struct object_id *oid, struct strbuf *err)
|
|
{
|
|
static char term = '\n';
|
|
struct object *o;
|
|
int fd;
|
|
|
|
o = parse_object(the_repository, oid);
|
|
if (!o) {
|
|
strbuf_addf(err,
|
|
"trying to write ref '%s' with nonexistent object %s",
|
|
lock->ref_name, oid_to_hex(oid));
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
|
|
strbuf_addf(err,
|
|
"trying to write non-commit object %s to branch '%s'",
|
|
oid_to_hex(oid), lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
fd = get_lock_file_fd(&lock->lk);
|
|
if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 ||
|
|
write_in_full(fd, &term, 1) < 0 ||
|
|
close_ref_gently(lock) < 0) {
|
|
strbuf_addf(err,
|
|
"couldn't write '%s'", get_lock_file_path(&lock->lk));
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Commit a change to a loose reference that has already been written
|
|
* to the loose reference lockfile. Also update the reflogs if
|
|
* necessary, using the specified lockmsg (which can be NULL).
|
|
*/
|
|
static int commit_ref_update(struct files_ref_store *refs,
|
|
struct ref_lock *lock,
|
|
const struct object_id *oid, const char *logmsg,
|
|
struct strbuf *err)
|
|
{
|
|
files_assert_main_repository(refs, "commit_ref_update");
|
|
|
|
clear_loose_ref_cache(refs);
|
|
if (files_log_ref_write(refs, lock->ref_name,
|
|
&lock->old_oid, oid,
|
|
logmsg, 0, err)) {
|
|
char *old_msg = strbuf_detach(err, NULL);
|
|
strbuf_addf(err, "cannot update the ref '%s': %s",
|
|
lock->ref_name, old_msg);
|
|
free(old_msg);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
|
|
if (strcmp(lock->ref_name, "HEAD") != 0) {
|
|
/*
|
|
* Special hack: If a branch is updated directly and HEAD
|
|
* points to it (may happen on the remote side of a push
|
|
* for example) then logically the HEAD reflog should be
|
|
* updated too.
|
|
* A generic solution implies reverse symref information,
|
|
* but finding all symrefs pointing to the given branch
|
|
* would be rather costly for this rare event (the direct
|
|
* update of a branch) to be worth it. So let's cheat and
|
|
* check with HEAD only which should cover 99% of all usage
|
|
* scenarios (even 100% of the default ones).
|
|
*/
|
|
int head_flag;
|
|
const char *head_ref;
|
|
|
|
head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD",
|
|
RESOLVE_REF_READING,
|
|
NULL, &head_flag);
|
|
if (head_ref && (head_flag & REF_ISSYMREF) &&
|
|
!strcmp(head_ref, lock->ref_name)) {
|
|
struct strbuf log_err = STRBUF_INIT;
|
|
if (files_log_ref_write(refs, "HEAD",
|
|
&lock->old_oid, oid,
|
|
logmsg, 0, &log_err)) {
|
|
error("%s", log_err.buf);
|
|
strbuf_release(&log_err);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (commit_ref(lock)) {
|
|
strbuf_addf(err, "couldn't set '%s'", lock->ref_name);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
|
|
static int create_ref_symlink(struct ref_lock *lock, const char *target)
|
|
{
|
|
int ret = -1;
|
|
#ifndef NO_SYMLINK_HEAD
|
|
char *ref_path = get_locked_file_path(&lock->lk);
|
|
unlink(ref_path);
|
|
ret = symlink(target, ref_path);
|
|
free(ref_path);
|
|
|
|
if (ret)
|
|
fprintf(stderr, "no symlink - falling back to symbolic ref\n");
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
static void update_symref_reflog(struct files_ref_store *refs,
|
|
struct ref_lock *lock, const char *refname,
|
|
const char *target, const char *logmsg)
|
|
{
|
|
struct strbuf err = STRBUF_INIT;
|
|
struct object_id new_oid;
|
|
if (logmsg &&
|
|
!refs_read_ref_full(&refs->base, target,
|
|
RESOLVE_REF_READING, &new_oid, NULL) &&
|
|
files_log_ref_write(refs, refname, &lock->old_oid,
|
|
&new_oid, logmsg, 0, &err)) {
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
}
|
|
}
|
|
|
|
static int create_symref_locked(struct files_ref_store *refs,
|
|
struct ref_lock *lock, const char *refname,
|
|
const char *target, const char *logmsg)
|
|
{
|
|
if (prefer_symlink_refs && !create_ref_symlink(lock, target)) {
|
|
update_symref_reflog(refs, lock, refname, target, logmsg);
|
|
return 0;
|
|
}
|
|
|
|
if (!fdopen_lock_file(&lock->lk, "w"))
|
|
return error("unable to fdopen %s: %s",
|
|
lock->lk.tempfile->filename.buf, strerror(errno));
|
|
|
|
update_symref_reflog(refs, lock, refname, target, logmsg);
|
|
|
|
/* no error check; commit_ref will check ferror */
|
|
fprintf(lock->lk.tempfile->fp, "ref: %s\n", target);
|
|
if (commit_ref(lock) < 0)
|
|
return error("unable to write symref for %s: %s", refname,
|
|
strerror(errno));
|
|
return 0;
|
|
}
|
|
|
|
static int files_create_symref(struct ref_store *ref_store,
|
|
const char *refname, const char *target,
|
|
const char *logmsg)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE, "create_symref");
|
|
struct strbuf err = STRBUF_INIT;
|
|
struct ref_lock *lock;
|
|
int ret;
|
|
|
|
lock = lock_ref_oid_basic(refs, refname, NULL,
|
|
NULL, NULL, REF_NO_DEREF, NULL,
|
|
&err);
|
|
if (!lock) {
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
return -1;
|
|
}
|
|
|
|
ret = create_symref_locked(refs, lock, refname, target, logmsg);
|
|
unlock_ref(lock);
|
|
return ret;
|
|
}
|
|
|
|
static int files_reflog_exists(struct ref_store *ref_store,
|
|
const char *refname)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_READ, "reflog_exists");
|
|
struct strbuf sb = STRBUF_INIT;
|
|
struct stat st;
|
|
int ret;
|
|
|
|
files_reflog_path(refs, &sb, refname);
|
|
ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
static int files_delete_reflog(struct ref_store *ref_store,
|
|
const char *refname)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog");
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int ret;
|
|
|
|
files_reflog_path(refs, &sb, refname);
|
|
ret = remove_path(sb.buf);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
struct object_id ooid, noid;
|
|
char *email_end, *message;
|
|
timestamp_t timestamp;
|
|
int tz;
|
|
const char *p = sb->buf;
|
|
|
|
/* old SP new SP name <email> SP time TAB msg LF */
|
|
if (!sb->len || sb->buf[sb->len - 1] != '\n' ||
|
|
parse_oid_hex(p, &ooid, &p) || *p++ != ' ' ||
|
|
parse_oid_hex(p, &noid, &p) || *p++ != ' ' ||
|
|
!(email_end = strchr(p, '>')) ||
|
|
email_end[1] != ' ' ||
|
|
!(timestamp = parse_timestamp(email_end + 2, &message, 10)) ||
|
|
!message || message[0] != ' ' ||
|
|
(message[1] != '+' && message[1] != '-') ||
|
|
!isdigit(message[2]) || !isdigit(message[3]) ||
|
|
!isdigit(message[4]) || !isdigit(message[5]))
|
|
return 0; /* corrupt? */
|
|
email_end[1] = '\0';
|
|
tz = strtol(message + 1, NULL, 10);
|
|
if (message[6] != '\t')
|
|
message += 6;
|
|
else
|
|
message += 7;
|
|
return fn(&ooid, &noid, p, timestamp, tz, message, cb_data);
|
|
}
|
|
|
|
static char *find_beginning_of_line(char *bob, char *scan)
|
|
{
|
|
while (bob < scan && *(--scan) != '\n')
|
|
; /* keep scanning backwards */
|
|
/*
|
|
* Return either beginning of the buffer, or LF at the end of
|
|
* the previous line.
|
|
*/
|
|
return scan;
|
|
}
|
|
|
|
static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store,
|
|
const char *refname,
|
|
each_reflog_ent_fn fn,
|
|
void *cb_data)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_READ,
|
|
"for_each_reflog_ent_reverse");
|
|
struct strbuf sb = STRBUF_INIT;
|
|
FILE *logfp;
|
|
long pos;
|
|
int ret = 0, at_tail = 1;
|
|
|
|
files_reflog_path(refs, &sb, refname);
|
|
logfp = fopen(sb.buf, "r");
|
|
strbuf_release(&sb);
|
|
if (!logfp)
|
|
return -1;
|
|
|
|
/* Jump to the end */
|
|
if (fseek(logfp, 0, SEEK_END) < 0)
|
|
ret = error("cannot seek back reflog for %s: %s",
|
|
refname, strerror(errno));
|
|
pos = ftell(logfp);
|
|
while (!ret && 0 < pos) {
|
|
int cnt;
|
|
size_t nread;
|
|
char buf[BUFSIZ];
|
|
char *endp, *scanp;
|
|
|
|
/* Fill next block from the end */
|
|
cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos;
|
|
if (fseek(logfp, pos - cnt, SEEK_SET)) {
|
|
ret = error("cannot seek back reflog for %s: %s",
|
|
refname, strerror(errno));
|
|
break;
|
|
}
|
|
nread = fread(buf, cnt, 1, logfp);
|
|
if (nread != 1) {
|
|
ret = error("cannot read %d bytes from reflog for %s: %s",
|
|
cnt, refname, strerror(errno));
|
|
break;
|
|
}
|
|
pos -= cnt;
|
|
|
|
scanp = endp = buf + cnt;
|
|
if (at_tail && scanp[-1] == '\n')
|
|
/* Looking at the final LF at the end of the file */
|
|
scanp--;
|
|
at_tail = 0;
|
|
|
|
while (buf < scanp) {
|
|
/*
|
|
* terminating LF of the previous line, or the beginning
|
|
* of the buffer.
|
|
*/
|
|
char *bp;
|
|
|
|
bp = find_beginning_of_line(buf, scanp);
|
|
|
|
if (*bp == '\n') {
|
|
/*
|
|
* The newline is the end of the previous line,
|
|
* so we know we have complete line starting
|
|
* at (bp + 1). Prefix it onto any prior data
|
|
* we collected for the line and process it.
|
|
*/
|
|
strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1));
|
|
scanp = bp;
|
|
endp = bp + 1;
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
strbuf_reset(&sb);
|
|
if (ret)
|
|
break;
|
|
} else if (!pos) {
|
|
/*
|
|
* We are at the start of the buffer, and the
|
|
* start of the file; there is no previous
|
|
* line, and we have everything for this one.
|
|
* Process it, and we can end the loop.
|
|
*/
|
|
strbuf_splice(&sb, 0, 0, buf, endp - buf);
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
strbuf_reset(&sb);
|
|
break;
|
|
}
|
|
|
|
if (bp == buf) {
|
|
/*
|
|
* We are at the start of the buffer, and there
|
|
* is more file to read backwards. Which means
|
|
* we are in the middle of a line. Note that we
|
|
* may get here even if *bp was a newline; that
|
|
* just means we are at the exact end of the
|
|
* previous line, rather than some spot in the
|
|
* middle.
|
|
*
|
|
* Save away what we have to be combined with
|
|
* the data from the next read.
|
|
*/
|
|
strbuf_splice(&sb, 0, 0, buf, endp - buf);
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
if (!ret && sb.len)
|
|
BUG("reverse reflog parser had leftover data");
|
|
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
static int files_for_each_reflog_ent(struct ref_store *ref_store,
|
|
const char *refname,
|
|
each_reflog_ent_fn fn, void *cb_data)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_READ,
|
|
"for_each_reflog_ent");
|
|
FILE *logfp;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
int ret = 0;
|
|
|
|
files_reflog_path(refs, &sb, refname);
|
|
logfp = fopen(sb.buf, "r");
|
|
strbuf_release(&sb);
|
|
if (!logfp)
|
|
return -1;
|
|
|
|
while (!ret && !strbuf_getwholeline(&sb, logfp, '\n'))
|
|
ret = show_one_reflog_ent(&sb, fn, cb_data);
|
|
fclose(logfp);
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
struct files_reflog_iterator {
|
|
struct ref_iterator base;
|
|
|
|
struct ref_store *ref_store;
|
|
struct dir_iterator *dir_iterator;
|
|
struct object_id oid;
|
|
};
|
|
|
|
static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator)
|
|
{
|
|
struct files_reflog_iterator *iter =
|
|
(struct files_reflog_iterator *)ref_iterator;
|
|
struct dir_iterator *diter = iter->dir_iterator;
|
|
int ok;
|
|
|
|
while ((ok = dir_iterator_advance(diter)) == ITER_OK) {
|
|
int flags;
|
|
|
|
if (!S_ISREG(diter->st.st_mode))
|
|
continue;
|
|
if (diter->basename[0] == '.')
|
|
continue;
|
|
if (ends_with(diter->basename, ".lock"))
|
|
continue;
|
|
|
|
if (refs_read_ref_full(iter->ref_store,
|
|
diter->relative_path, 0,
|
|
&iter->oid, &flags)) {
|
|
error("bad ref for %s", diter->path.buf);
|
|
continue;
|
|
}
|
|
|
|
iter->base.refname = diter->relative_path;
|
|
iter->base.oid = &iter->oid;
|
|
iter->base.flags = flags;
|
|
return ITER_OK;
|
|
}
|
|
|
|
iter->dir_iterator = NULL;
|
|
if (ref_iterator_abort(ref_iterator) == ITER_ERROR)
|
|
ok = ITER_ERROR;
|
|
return ok;
|
|
}
|
|
|
|
static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator,
|
|
struct object_id *peeled)
|
|
{
|
|
BUG("ref_iterator_peel() called for reflog_iterator");
|
|
}
|
|
|
|
static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator)
|
|
{
|
|
struct files_reflog_iterator *iter =
|
|
(struct files_reflog_iterator *)ref_iterator;
|
|
int ok = ITER_DONE;
|
|
|
|
if (iter->dir_iterator)
|
|
ok = dir_iterator_abort(iter->dir_iterator);
|
|
|
|
base_ref_iterator_free(ref_iterator);
|
|
return ok;
|
|
}
|
|
|
|
static struct ref_iterator_vtable files_reflog_iterator_vtable = {
|
|
files_reflog_iterator_advance,
|
|
files_reflog_iterator_peel,
|
|
files_reflog_iterator_abort
|
|
};
|
|
|
|
static struct ref_iterator *reflog_iterator_begin(struct ref_store *ref_store,
|
|
const char *gitdir)
|
|
{
|
|
struct dir_iterator *diter;
|
|
struct files_reflog_iterator *iter;
|
|
struct ref_iterator *ref_iterator;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
strbuf_addf(&sb, "%s/logs", gitdir);
|
|
|
|
diter = dir_iterator_begin(sb.buf, 0);
|
|
if (!diter) {
|
|
strbuf_release(&sb);
|
|
return empty_ref_iterator_begin();
|
|
}
|
|
|
|
iter = xcalloc(1, sizeof(*iter));
|
|
ref_iterator = &iter->base;
|
|
|
|
base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable, 0);
|
|
iter->dir_iterator = diter;
|
|
iter->ref_store = ref_store;
|
|
strbuf_release(&sb);
|
|
|
|
return ref_iterator;
|
|
}
|
|
|
|
static enum iterator_selection reflog_iterator_select(
|
|
struct ref_iterator *iter_worktree,
|
|
struct ref_iterator *iter_common,
|
|
void *cb_data)
|
|
{
|
|
if (iter_worktree) {
|
|
/*
|
|
* We're a bit loose here. We probably should ignore
|
|
* common refs if they are accidentally added as
|
|
* per-worktree refs.
|
|
*/
|
|
return ITER_SELECT_0;
|
|
} else if (iter_common) {
|
|
if (ref_type(iter_common->refname) == REF_TYPE_NORMAL)
|
|
return ITER_SELECT_1;
|
|
|
|
/*
|
|
* The main ref store may contain main worktree's
|
|
* per-worktree refs, which should be ignored
|
|
*/
|
|
return ITER_SKIP_1;
|
|
} else
|
|
return ITER_DONE;
|
|
}
|
|
|
|
static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_READ,
|
|
"reflog_iterator_begin");
|
|
|
|
if (!strcmp(refs->base.gitdir, refs->gitcommondir)) {
|
|
return reflog_iterator_begin(ref_store, refs->gitcommondir);
|
|
} else {
|
|
return merge_ref_iterator_begin(
|
|
0, reflog_iterator_begin(ref_store, refs->base.gitdir),
|
|
reflog_iterator_begin(ref_store, refs->gitcommondir),
|
|
reflog_iterator_select, refs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If update is a direct update of head_ref (the reference pointed to
|
|
* by HEAD), then add an extra REF_LOG_ONLY update for HEAD.
|
|
*/
|
|
static int split_head_update(struct ref_update *update,
|
|
struct ref_transaction *transaction,
|
|
const char *head_ref,
|
|
struct string_list *affected_refnames,
|
|
struct strbuf *err)
|
|
{
|
|
struct string_list_item *item;
|
|
struct ref_update *new_update;
|
|
|
|
if ((update->flags & REF_LOG_ONLY) ||
|
|
(update->flags & REF_IS_PRUNING) ||
|
|
(update->flags & REF_UPDATE_VIA_HEAD))
|
|
return 0;
|
|
|
|
if (strcmp(update->refname, head_ref))
|
|
return 0;
|
|
|
|
/*
|
|
* First make sure that HEAD is not already in the
|
|
* transaction. This check is O(lg N) in the transaction
|
|
* size, but it happens at most once per transaction.
|
|
*/
|
|
if (string_list_has_string(affected_refnames, "HEAD")) {
|
|
/* An entry already existed */
|
|
strbuf_addf(err,
|
|
"multiple updates for 'HEAD' (including one "
|
|
"via its referent '%s') are not allowed",
|
|
update->refname);
|
|
return TRANSACTION_NAME_CONFLICT;
|
|
}
|
|
|
|
new_update = ref_transaction_add_update(
|
|
transaction, "HEAD",
|
|
update->flags | REF_LOG_ONLY | REF_NO_DEREF,
|
|
&update->new_oid, &update->old_oid,
|
|
update->msg);
|
|
|
|
/*
|
|
* Add "HEAD". This insertion is O(N) in the transaction
|
|
* size, but it happens at most once per transaction.
|
|
* Add new_update->refname instead of a literal "HEAD".
|
|
*/
|
|
if (strcmp(new_update->refname, "HEAD"))
|
|
BUG("%s unexpectedly not 'HEAD'", new_update->refname);
|
|
item = string_list_insert(affected_refnames, new_update->refname);
|
|
item->util = new_update;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* update is for a symref that points at referent and doesn't have
|
|
* REF_NO_DEREF set. Split it into two updates:
|
|
* - The original update, but with REF_LOG_ONLY and REF_NO_DEREF set
|
|
* - A new, separate update for the referent reference
|
|
* Note that the new update will itself be subject to splitting when
|
|
* the iteration gets to it.
|
|
*/
|
|
static int split_symref_update(struct ref_update *update,
|
|
const char *referent,
|
|
struct ref_transaction *transaction,
|
|
struct string_list *affected_refnames,
|
|
struct strbuf *err)
|
|
{
|
|
struct string_list_item *item;
|
|
struct ref_update *new_update;
|
|
unsigned int new_flags;
|
|
|
|
/*
|
|
* First make sure that referent is not already in the
|
|
* transaction. This check is O(lg N) in the transaction
|
|
* size, but it happens at most once per symref in a
|
|
* transaction.
|
|
*/
|
|
if (string_list_has_string(affected_refnames, referent)) {
|
|
/* An entry already exists */
|
|
strbuf_addf(err,
|
|
"multiple updates for '%s' (including one "
|
|
"via symref '%s') are not allowed",
|
|
referent, update->refname);
|
|
return TRANSACTION_NAME_CONFLICT;
|
|
}
|
|
|
|
new_flags = update->flags;
|
|
if (!strcmp(update->refname, "HEAD")) {
|
|
/*
|
|
* Record that the new update came via HEAD, so that
|
|
* when we process it, split_head_update() doesn't try
|
|
* to add another reflog update for HEAD. Note that
|
|
* this bit will be propagated if the new_update
|
|
* itself needs to be split.
|
|
*/
|
|
new_flags |= REF_UPDATE_VIA_HEAD;
|
|
}
|
|
|
|
new_update = ref_transaction_add_update(
|
|
transaction, referent, new_flags,
|
|
&update->new_oid, &update->old_oid,
|
|
update->msg);
|
|
|
|
new_update->parent_update = update;
|
|
|
|
/*
|
|
* Change the symbolic ref update to log only. Also, it
|
|
* doesn't need to check its old OID value, as that will be
|
|
* done when new_update is processed.
|
|
*/
|
|
update->flags |= REF_LOG_ONLY | REF_NO_DEREF;
|
|
update->flags &= ~REF_HAVE_OLD;
|
|
|
|
/*
|
|
* Add the referent. This insertion is O(N) in the transaction
|
|
* size, but it happens at most once per symref in a
|
|
* transaction. Make sure to add new_update->refname, which will
|
|
* be valid as long as affected_refnames is in use, and NOT
|
|
* referent, which might soon be freed by our caller.
|
|
*/
|
|
item = string_list_insert(affected_refnames, new_update->refname);
|
|
if (item->util)
|
|
BUG("%s unexpectedly found in affected_refnames",
|
|
new_update->refname);
|
|
item->util = new_update;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the refname under which update was originally requested.
|
|
*/
|
|
static const char *original_update_refname(struct ref_update *update)
|
|
{
|
|
while (update->parent_update)
|
|
update = update->parent_update;
|
|
|
|
return update->refname;
|
|
}
|
|
|
|
/*
|
|
* Check whether the REF_HAVE_OLD and old_oid values stored in update
|
|
* are consistent with oid, which is the reference's current value. If
|
|
* everything is OK, return 0; otherwise, write an error message to
|
|
* err and return -1.
|
|
*/
|
|
static int check_old_oid(struct ref_update *update, struct object_id *oid,
|
|
struct strbuf *err)
|
|
{
|
|
if (!(update->flags & REF_HAVE_OLD) ||
|
|
oideq(oid, &update->old_oid))
|
|
return 0;
|
|
|
|
if (is_null_oid(&update->old_oid))
|
|
strbuf_addf(err, "cannot lock ref '%s': "
|
|
"reference already exists",
|
|
original_update_refname(update));
|
|
else if (is_null_oid(oid))
|
|
strbuf_addf(err, "cannot lock ref '%s': "
|
|
"reference is missing but expected %s",
|
|
original_update_refname(update),
|
|
oid_to_hex(&update->old_oid));
|
|
else
|
|
strbuf_addf(err, "cannot lock ref '%s': "
|
|
"is at %s but expected %s",
|
|
original_update_refname(update),
|
|
oid_to_hex(oid),
|
|
oid_to_hex(&update->old_oid));
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Prepare for carrying out update:
|
|
* - Lock the reference referred to by update.
|
|
* - Read the reference under lock.
|
|
* - Check that its old OID value (if specified) is correct, and in
|
|
* any case record it in update->lock->old_oid for later use when
|
|
* writing the reflog.
|
|
* - If it is a symref update without REF_NO_DEREF, split it up into a
|
|
* REF_LOG_ONLY update of the symref and add a separate update for
|
|
* the referent to transaction.
|
|
* - If it is an update of head_ref, add a corresponding REF_LOG_ONLY
|
|
* update of HEAD.
|
|
*/
|
|
static int lock_ref_for_update(struct files_ref_store *refs,
|
|
struct ref_update *update,
|
|
struct ref_transaction *transaction,
|
|
const char *head_ref,
|
|
struct string_list *affected_refnames,
|
|
struct strbuf *err)
|
|
{
|
|
struct strbuf referent = STRBUF_INIT;
|
|
int mustexist = (update->flags & REF_HAVE_OLD) &&
|
|
!is_null_oid(&update->old_oid);
|
|
int ret = 0;
|
|
struct ref_lock *lock;
|
|
|
|
files_assert_main_repository(refs, "lock_ref_for_update");
|
|
|
|
if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid))
|
|
update->flags |= REF_DELETING;
|
|
|
|
if (head_ref) {
|
|
ret = split_head_update(update, transaction, head_ref,
|
|
affected_refnames, err);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
ret = lock_raw_ref(refs, update->refname, mustexist,
|
|
affected_refnames, NULL,
|
|
&lock, &referent,
|
|
&update->type, err);
|
|
if (ret) {
|
|
char *reason;
|
|
|
|
reason = strbuf_detach(err, NULL);
|
|
strbuf_addf(err, "cannot lock ref '%s': %s",
|
|
original_update_refname(update), reason);
|
|
free(reason);
|
|
goto out;
|
|
}
|
|
|
|
update->backend_data = lock;
|
|
|
|
if (update->type & REF_ISSYMREF) {
|
|
if (update->flags & REF_NO_DEREF) {
|
|
/*
|
|
* We won't be reading the referent as part of
|
|
* the transaction, so we have to read it here
|
|
* to record and possibly check old_oid:
|
|
*/
|
|
if (refs_read_ref_full(&refs->base,
|
|
referent.buf, 0,
|
|
&lock->old_oid, NULL)) {
|
|
if (update->flags & REF_HAVE_OLD) {
|
|
strbuf_addf(err, "cannot lock ref '%s': "
|
|
"error reading reference",
|
|
original_update_refname(update));
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto out;
|
|
}
|
|
} else if (check_old_oid(update, &lock->old_oid, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto out;
|
|
}
|
|
} else {
|
|
/*
|
|
* Create a new update for the reference this
|
|
* symref is pointing at. Also, we will record
|
|
* and verify old_oid for this update as part
|
|
* of processing the split-off update, so we
|
|
* don't have to do it here.
|
|
*/
|
|
ret = split_symref_update(update,
|
|
referent.buf, transaction,
|
|
affected_refnames, err);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
} else {
|
|
struct ref_update *parent_update;
|
|
|
|
if (check_old_oid(update, &lock->old_oid, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If this update is happening indirectly because of a
|
|
* symref update, record the old OID in the parent
|
|
* update:
|
|
*/
|
|
for (parent_update = update->parent_update;
|
|
parent_update;
|
|
parent_update = parent_update->parent_update) {
|
|
struct ref_lock *parent_lock = parent_update->backend_data;
|
|
oidcpy(&parent_lock->old_oid, &lock->old_oid);
|
|
}
|
|
}
|
|
|
|
if ((update->flags & REF_HAVE_NEW) &&
|
|
!(update->flags & REF_DELETING) &&
|
|
!(update->flags & REF_LOG_ONLY)) {
|
|
if (!(update->type & REF_ISSYMREF) &&
|
|
oideq(&lock->old_oid, &update->new_oid)) {
|
|
/*
|
|
* The reference already has the desired
|
|
* value, so we don't need to write it.
|
|
*/
|
|
} else if (write_ref_to_lockfile(lock, &update->new_oid,
|
|
err)) {
|
|
char *write_err = strbuf_detach(err, NULL);
|
|
|
|
/*
|
|
* The lock was freed upon failure of
|
|
* write_ref_to_lockfile():
|
|
*/
|
|
update->backend_data = NULL;
|
|
strbuf_addf(err,
|
|
"cannot update ref '%s': %s",
|
|
update->refname, write_err);
|
|
free(write_err);
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto out;
|
|
} else {
|
|
update->flags |= REF_NEEDS_COMMIT;
|
|
}
|
|
}
|
|
if (!(update->flags & REF_NEEDS_COMMIT)) {
|
|
/*
|
|
* We didn't call write_ref_to_lockfile(), so
|
|
* the lockfile is still open. Close it to
|
|
* free up the file descriptor:
|
|
*/
|
|
if (close_ref_gently(lock)) {
|
|
strbuf_addf(err, "couldn't close '%s.lock'",
|
|
update->refname);
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
strbuf_release(&referent);
|
|
return ret;
|
|
}
|
|
|
|
struct files_transaction_backend_data {
|
|
struct ref_transaction *packed_transaction;
|
|
int packed_refs_locked;
|
|
};
|
|
|
|
/*
|
|
* Unlock any references in `transaction` that are still locked, and
|
|
* mark the transaction closed.
|
|
*/
|
|
static void files_transaction_cleanup(struct files_ref_store *refs,
|
|
struct ref_transaction *transaction)
|
|
{
|
|
size_t i;
|
|
struct files_transaction_backend_data *backend_data =
|
|
transaction->backend_data;
|
|
struct strbuf err = STRBUF_INIT;
|
|
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
struct ref_lock *lock = update->backend_data;
|
|
|
|
if (lock) {
|
|
unlock_ref(lock);
|
|
update->backend_data = NULL;
|
|
}
|
|
}
|
|
|
|
if (backend_data) {
|
|
if (backend_data->packed_transaction &&
|
|
ref_transaction_abort(backend_data->packed_transaction, &err)) {
|
|
error("error aborting transaction: %s", err.buf);
|
|
strbuf_release(&err);
|
|
}
|
|
|
|
if (backend_data->packed_refs_locked)
|
|
packed_refs_unlock(refs->packed_ref_store);
|
|
|
|
free(backend_data);
|
|
}
|
|
|
|
transaction->state = REF_TRANSACTION_CLOSED;
|
|
}
|
|
|
|
static int files_transaction_prepare(struct ref_store *ref_store,
|
|
struct ref_transaction *transaction,
|
|
struct strbuf *err)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE,
|
|
"ref_transaction_prepare");
|
|
size_t i;
|
|
int ret = 0;
|
|
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
|
|
char *head_ref = NULL;
|
|
int head_type;
|
|
struct files_transaction_backend_data *backend_data;
|
|
struct ref_transaction *packed_transaction = NULL;
|
|
|
|
assert(err);
|
|
|
|
if (!transaction->nr)
|
|
goto cleanup;
|
|
|
|
backend_data = xcalloc(1, sizeof(*backend_data));
|
|
transaction->backend_data = backend_data;
|
|
|
|
/*
|
|
* Fail if a refname appears more than once in the
|
|
* transaction. (If we end up splitting up any updates using
|
|
* split_symref_update() or split_head_update(), those
|
|
* functions will check that the new updates don't have the
|
|
* same refname as any existing ones.) Also fail if any of the
|
|
* updates use REF_IS_PRUNING without REF_NO_DEREF.
|
|
*/
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
struct string_list_item *item =
|
|
string_list_append(&affected_refnames, update->refname);
|
|
|
|
if ((update->flags & REF_IS_PRUNING) &&
|
|
!(update->flags & REF_NO_DEREF))
|
|
BUG("REF_IS_PRUNING set without REF_NO_DEREF");
|
|
|
|
/*
|
|
* We store a pointer to update in item->util, but at
|
|
* the moment we never use the value of this field
|
|
* except to check whether it is non-NULL.
|
|
*/
|
|
item->util = update;
|
|
}
|
|
string_list_sort(&affected_refnames);
|
|
if (ref_update_reject_duplicates(&affected_refnames, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Special hack: If a branch is updated directly and HEAD
|
|
* points to it (may happen on the remote side of a push
|
|
* for example) then logically the HEAD reflog should be
|
|
* updated too.
|
|
*
|
|
* A generic solution would require reverse symref lookups,
|
|
* but finding all symrefs pointing to a given branch would be
|
|
* rather costly for this rare event (the direct update of a
|
|
* branch) to be worth it. So let's cheat and check with HEAD
|
|
* only, which should cover 99% of all usage scenarios (even
|
|
* 100% of the default ones).
|
|
*
|
|
* So if HEAD is a symbolic reference, then record the name of
|
|
* the reference that it points to. If we see an update of
|
|
* head_ref within the transaction, then split_head_update()
|
|
* arranges for the reflog of HEAD to be updated, too.
|
|
*/
|
|
head_ref = refs_resolve_refdup(ref_store, "HEAD",
|
|
RESOLVE_REF_NO_RECURSE,
|
|
NULL, &head_type);
|
|
|
|
if (head_ref && !(head_type & REF_ISSYMREF)) {
|
|
FREE_AND_NULL(head_ref);
|
|
}
|
|
|
|
/*
|
|
* Acquire all locks, verify old values if provided, check
|
|
* that new values are valid, and write new values to the
|
|
* lockfiles, ready to be activated. Only keep one lockfile
|
|
* open at a time to avoid running out of file descriptors.
|
|
* Note that lock_ref_for_update() might append more updates
|
|
* to the transaction.
|
|
*/
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
|
|
ret = lock_ref_for_update(refs, update, transaction,
|
|
head_ref, &affected_refnames, err);
|
|
if (ret)
|
|
goto cleanup;
|
|
|
|
if (update->flags & REF_DELETING &&
|
|
!(update->flags & REF_LOG_ONLY) &&
|
|
!(update->flags & REF_IS_PRUNING)) {
|
|
/*
|
|
* This reference has to be deleted from
|
|
* packed-refs if it exists there.
|
|
*/
|
|
if (!packed_transaction) {
|
|
packed_transaction = ref_store_transaction_begin(
|
|
refs->packed_ref_store, err);
|
|
if (!packed_transaction) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
backend_data->packed_transaction =
|
|
packed_transaction;
|
|
}
|
|
|
|
ref_transaction_add_update(
|
|
packed_transaction, update->refname,
|
|
REF_HAVE_NEW | REF_NO_DEREF,
|
|
&update->new_oid, NULL,
|
|
NULL);
|
|
}
|
|
}
|
|
|
|
if (packed_transaction) {
|
|
if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
backend_data->packed_refs_locked = 1;
|
|
|
|
if (is_packed_transaction_needed(refs->packed_ref_store,
|
|
packed_transaction)) {
|
|
ret = ref_transaction_prepare(packed_transaction, err);
|
|
/*
|
|
* A failure during the prepare step will abort
|
|
* itself, but not free. Do that now, and disconnect
|
|
* from the files_transaction so it does not try to
|
|
* abort us when we hit the cleanup code below.
|
|
*/
|
|
if (ret) {
|
|
ref_transaction_free(packed_transaction);
|
|
backend_data->packed_transaction = NULL;
|
|
}
|
|
} else {
|
|
/*
|
|
* We can skip rewriting the `packed-refs`
|
|
* file. But we do need to leave it locked, so
|
|
* that somebody else doesn't pack a reference
|
|
* that we are trying to delete.
|
|
*
|
|
* We need to disconnect our transaction from
|
|
* backend_data, since the abort (whether successful or
|
|
* not) will free it.
|
|
*/
|
|
backend_data->packed_transaction = NULL;
|
|
if (ref_transaction_abort(packed_transaction, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
|
|
cleanup:
|
|
free(head_ref);
|
|
string_list_clear(&affected_refnames, 0);
|
|
|
|
if (ret)
|
|
files_transaction_cleanup(refs, transaction);
|
|
else
|
|
transaction->state = REF_TRANSACTION_PREPARED;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int files_transaction_finish(struct ref_store *ref_store,
|
|
struct ref_transaction *transaction,
|
|
struct strbuf *err)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, 0, "ref_transaction_finish");
|
|
size_t i;
|
|
int ret = 0;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
struct files_transaction_backend_data *backend_data;
|
|
struct ref_transaction *packed_transaction;
|
|
|
|
|
|
assert(err);
|
|
|
|
if (!transaction->nr) {
|
|
transaction->state = REF_TRANSACTION_CLOSED;
|
|
return 0;
|
|
}
|
|
|
|
backend_data = transaction->backend_data;
|
|
packed_transaction = backend_data->packed_transaction;
|
|
|
|
/* Perform updates first so live commits remain referenced */
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
struct ref_lock *lock = update->backend_data;
|
|
|
|
if (update->flags & REF_NEEDS_COMMIT ||
|
|
update->flags & REF_LOG_ONLY) {
|
|
if (files_log_ref_write(refs,
|
|
lock->ref_name,
|
|
&lock->old_oid,
|
|
&update->new_oid,
|
|
update->msg, update->flags,
|
|
err)) {
|
|
char *old_msg = strbuf_detach(err, NULL);
|
|
|
|
strbuf_addf(err, "cannot update the ref '%s': %s",
|
|
lock->ref_name, old_msg);
|
|
free(old_msg);
|
|
unlock_ref(lock);
|
|
update->backend_data = NULL;
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
if (update->flags & REF_NEEDS_COMMIT) {
|
|
clear_loose_ref_cache(refs);
|
|
if (commit_ref(lock)) {
|
|
strbuf_addf(err, "couldn't set '%s'", lock->ref_name);
|
|
unlock_ref(lock);
|
|
update->backend_data = NULL;
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now that updates are safely completed, we can perform
|
|
* deletes. First delete the reflogs of any references that
|
|
* will be deleted, since (in the unexpected event of an
|
|
* error) leaving a reference without a reflog is less bad
|
|
* than leaving a reflog without a reference (the latter is a
|
|
* mildly invalid repository state):
|
|
*/
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
if (update->flags & REF_DELETING &&
|
|
!(update->flags & REF_LOG_ONLY) &&
|
|
!(update->flags & REF_IS_PRUNING)) {
|
|
strbuf_reset(&sb);
|
|
files_reflog_path(refs, &sb, update->refname);
|
|
if (!unlink_or_warn(sb.buf))
|
|
try_remove_empty_parents(refs, update->refname,
|
|
REMOVE_EMPTY_PARENTS_REFLOG);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform deletes now that updates are safely completed.
|
|
*
|
|
* First delete any packed versions of the references, while
|
|
* retaining the packed-refs lock:
|
|
*/
|
|
if (packed_transaction) {
|
|
ret = ref_transaction_commit(packed_transaction, err);
|
|
ref_transaction_free(packed_transaction);
|
|
packed_transaction = NULL;
|
|
backend_data->packed_transaction = NULL;
|
|
if (ret)
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Now delete the loose versions of the references: */
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
struct ref_lock *lock = update->backend_data;
|
|
|
|
if (update->flags & REF_DELETING &&
|
|
!(update->flags & REF_LOG_ONLY)) {
|
|
if (!(update->type & REF_ISPACKED) ||
|
|
update->type & REF_ISSYMREF) {
|
|
/* It is a loose reference. */
|
|
strbuf_reset(&sb);
|
|
files_ref_path(refs, &sb, lock->ref_name);
|
|
if (unlink_or_msg(sb.buf, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
update->flags |= REF_DELETED_LOOSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
clear_loose_ref_cache(refs);
|
|
|
|
cleanup:
|
|
files_transaction_cleanup(refs, transaction);
|
|
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
|
|
if (update->flags & REF_DELETED_LOOSE) {
|
|
/*
|
|
* The loose reference was deleted. Delete any
|
|
* empty parent directories. (Note that this
|
|
* can only work because we have already
|
|
* removed the lockfile.)
|
|
*/
|
|
try_remove_empty_parents(refs, update->refname,
|
|
REMOVE_EMPTY_PARENTS_REF);
|
|
}
|
|
}
|
|
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
static int files_transaction_abort(struct ref_store *ref_store,
|
|
struct ref_transaction *transaction,
|
|
struct strbuf *err)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, 0, "ref_transaction_abort");
|
|
|
|
files_transaction_cleanup(refs, transaction);
|
|
return 0;
|
|
}
|
|
|
|
static int ref_present(const char *refname,
|
|
const struct object_id *oid, int flags, void *cb_data)
|
|
{
|
|
struct string_list *affected_refnames = cb_data;
|
|
|
|
return string_list_has_string(affected_refnames, refname);
|
|
}
|
|
|
|
static int files_initial_transaction_commit(struct ref_store *ref_store,
|
|
struct ref_transaction *transaction,
|
|
struct strbuf *err)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE,
|
|
"initial_ref_transaction_commit");
|
|
size_t i;
|
|
int ret = 0;
|
|
struct string_list affected_refnames = STRING_LIST_INIT_NODUP;
|
|
struct ref_transaction *packed_transaction = NULL;
|
|
|
|
assert(err);
|
|
|
|
if (transaction->state != REF_TRANSACTION_OPEN)
|
|
BUG("commit called for transaction that is not open");
|
|
|
|
/* Fail if a refname appears more than once in the transaction: */
|
|
for (i = 0; i < transaction->nr; i++)
|
|
string_list_append(&affected_refnames,
|
|
transaction->updates[i]->refname);
|
|
string_list_sort(&affected_refnames);
|
|
if (ref_update_reject_duplicates(&affected_refnames, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* It's really undefined to call this function in an active
|
|
* repository or when there are existing references: we are
|
|
* only locking and changing packed-refs, so (1) any
|
|
* simultaneous processes might try to change a reference at
|
|
* the same time we do, and (2) any existing loose versions of
|
|
* the references that we are setting would have precedence
|
|
* over our values. But some remote helpers create the remote
|
|
* "HEAD" and "master" branches before calling this function,
|
|
* so here we really only check that none of the references
|
|
* that we are creating already exists.
|
|
*/
|
|
if (refs_for_each_rawref(&refs->base, ref_present,
|
|
&affected_refnames))
|
|
BUG("initial ref transaction called with existing refs");
|
|
|
|
packed_transaction = ref_store_transaction_begin(refs->packed_ref_store, err);
|
|
if (!packed_transaction) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
struct ref_update *update = transaction->updates[i];
|
|
|
|
if ((update->flags & REF_HAVE_OLD) &&
|
|
!is_null_oid(&update->old_oid))
|
|
BUG("initial ref transaction with old_sha1 set");
|
|
if (refs_verify_refname_available(&refs->base, update->refname,
|
|
&affected_refnames, NULL,
|
|
err)) {
|
|
ret = TRANSACTION_NAME_CONFLICT;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Add a reference creation for this reference to the
|
|
* packed-refs transaction:
|
|
*/
|
|
ref_transaction_add_update(packed_transaction, update->refname,
|
|
update->flags & ~REF_HAVE_OLD,
|
|
&update->new_oid, &update->old_oid,
|
|
NULL);
|
|
}
|
|
|
|
if (packed_refs_lock(refs->packed_ref_store, 0, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (initial_ref_transaction_commit(packed_transaction, err)) {
|
|
ret = TRANSACTION_GENERIC_ERROR;
|
|
}
|
|
|
|
packed_refs_unlock(refs->packed_ref_store);
|
|
cleanup:
|
|
if (packed_transaction)
|
|
ref_transaction_free(packed_transaction);
|
|
transaction->state = REF_TRANSACTION_CLOSED;
|
|
string_list_clear(&affected_refnames, 0);
|
|
return ret;
|
|
}
|
|
|
|
struct expire_reflog_cb {
|
|
unsigned int flags;
|
|
reflog_expiry_should_prune_fn *should_prune_fn;
|
|
void *policy_cb;
|
|
FILE *newlog;
|
|
struct object_id last_kept_oid;
|
|
};
|
|
|
|
static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
|
|
const char *email, timestamp_t timestamp, int tz,
|
|
const char *message, void *cb_data)
|
|
{
|
|
struct expire_reflog_cb *cb = cb_data;
|
|
struct expire_reflog_policy_cb *policy_cb = cb->policy_cb;
|
|
|
|
if (cb->flags & EXPIRE_REFLOGS_REWRITE)
|
|
ooid = &cb->last_kept_oid;
|
|
|
|
if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz,
|
|
message, policy_cb)) {
|
|
if (!cb->newlog)
|
|
printf("would prune %s", message);
|
|
else if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
|
|
printf("prune %s", message);
|
|
} else {
|
|
if (cb->newlog) {
|
|
fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s",
|
|
oid_to_hex(ooid), oid_to_hex(noid),
|
|
email, timestamp, tz, message);
|
|
oidcpy(&cb->last_kept_oid, noid);
|
|
}
|
|
if (cb->flags & EXPIRE_REFLOGS_VERBOSE)
|
|
printf("keep %s", message);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int files_reflog_expire(struct ref_store *ref_store,
|
|
const char *refname, const struct object_id *oid,
|
|
unsigned int flags,
|
|
reflog_expiry_prepare_fn prepare_fn,
|
|
reflog_expiry_should_prune_fn should_prune_fn,
|
|
reflog_expiry_cleanup_fn cleanup_fn,
|
|
void *policy_cb_data)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire");
|
|
struct lock_file reflog_lock = LOCK_INIT;
|
|
struct expire_reflog_cb cb;
|
|
struct ref_lock *lock;
|
|
struct strbuf log_file_sb = STRBUF_INIT;
|
|
char *log_file;
|
|
int status = 0;
|
|
int type;
|
|
struct strbuf err = STRBUF_INIT;
|
|
|
|
memset(&cb, 0, sizeof(cb));
|
|
cb.flags = flags;
|
|
cb.policy_cb = policy_cb_data;
|
|
cb.should_prune_fn = should_prune_fn;
|
|
|
|
/*
|
|
* The reflog file is locked by holding the lock on the
|
|
* reference itself, plus we might need to update the
|
|
* reference if --updateref was specified:
|
|
*/
|
|
lock = lock_ref_oid_basic(refs, refname, oid,
|
|
NULL, NULL, REF_NO_DEREF,
|
|
&type, &err);
|
|
if (!lock) {
|
|
error("cannot lock ref '%s': %s", refname, err.buf);
|
|
strbuf_release(&err);
|
|
return -1;
|
|
}
|
|
if (!refs_reflog_exists(ref_store, refname)) {
|
|
unlock_ref(lock);
|
|
return 0;
|
|
}
|
|
|
|
files_reflog_path(refs, &log_file_sb, refname);
|
|
log_file = strbuf_detach(&log_file_sb, NULL);
|
|
if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
|
|
/*
|
|
* Even though holding $GIT_DIR/logs/$reflog.lock has
|
|
* no locking implications, we use the lock_file
|
|
* machinery here anyway because it does a lot of the
|
|
* work we need, including cleaning up if the program
|
|
* exits unexpectedly.
|
|
*/
|
|
if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) {
|
|
struct strbuf err = STRBUF_INIT;
|
|
unable_to_lock_message(log_file, errno, &err);
|
|
error("%s", err.buf);
|
|
strbuf_release(&err);
|
|
goto failure;
|
|
}
|
|
cb.newlog = fdopen_lock_file(&reflog_lock, "w");
|
|
if (!cb.newlog) {
|
|
error("cannot fdopen %s (%s)",
|
|
get_lock_file_path(&reflog_lock), strerror(errno));
|
|
goto failure;
|
|
}
|
|
}
|
|
|
|
(*prepare_fn)(refname, oid, cb.policy_cb);
|
|
refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb);
|
|
(*cleanup_fn)(cb.policy_cb);
|
|
|
|
if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) {
|
|
/*
|
|
* It doesn't make sense to adjust a reference pointed
|
|
* to by a symbolic ref based on expiring entries in
|
|
* the symbolic reference's reflog. Nor can we update
|
|
* a reference if there are no remaining reflog
|
|
* entries.
|
|
*/
|
|
int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) &&
|
|
!(type & REF_ISSYMREF) &&
|
|
!is_null_oid(&cb.last_kept_oid);
|
|
|
|
if (close_lock_file_gently(&reflog_lock)) {
|
|
status |= error("couldn't write %s: %s", log_file,
|
|
strerror(errno));
|
|
rollback_lock_file(&reflog_lock);
|
|
} else if (update &&
|
|
(write_in_full(get_lock_file_fd(&lock->lk),
|
|
oid_to_hex(&cb.last_kept_oid), the_hash_algo->hexsz) < 0 ||
|
|
write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 ||
|
|
close_ref_gently(lock) < 0)) {
|
|
status |= error("couldn't write %s",
|
|
get_lock_file_path(&lock->lk));
|
|
rollback_lock_file(&reflog_lock);
|
|
} else if (commit_lock_file(&reflog_lock)) {
|
|
status |= error("unable to write reflog '%s' (%s)",
|
|
log_file, strerror(errno));
|
|
} else if (update && commit_ref(lock)) {
|
|
status |= error("couldn't set %s", lock->ref_name);
|
|
}
|
|
}
|
|
free(log_file);
|
|
unlock_ref(lock);
|
|
return status;
|
|
|
|
failure:
|
|
rollback_lock_file(&reflog_lock);
|
|
free(log_file);
|
|
unlock_ref(lock);
|
|
return -1;
|
|
}
|
|
|
|
static int files_init_db(struct ref_store *ref_store, struct strbuf *err)
|
|
{
|
|
struct files_ref_store *refs =
|
|
files_downcast(ref_store, REF_STORE_WRITE, "init_db");
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
/*
|
|
* Create .git/refs/{heads,tags}
|
|
*/
|
|
files_ref_path(refs, &sb, "refs/heads");
|
|
safe_create_dir(sb.buf, 1);
|
|
|
|
strbuf_reset(&sb);
|
|
files_ref_path(refs, &sb, "refs/tags");
|
|
safe_create_dir(sb.buf, 1);
|
|
|
|
strbuf_release(&sb);
|
|
return 0;
|
|
}
|
|
|
|
struct ref_storage_be refs_be_files = {
|
|
NULL,
|
|
"files",
|
|
files_ref_store_create,
|
|
files_init_db,
|
|
files_transaction_prepare,
|
|
files_transaction_finish,
|
|
files_transaction_abort,
|
|
files_initial_transaction_commit,
|
|
|
|
files_pack_refs,
|
|
files_create_symref,
|
|
files_delete_refs,
|
|
files_rename_ref,
|
|
files_copy_ref,
|
|
|
|
files_ref_iterator_begin,
|
|
files_read_raw_ref,
|
|
|
|
files_reflog_iterator_begin,
|
|
files_for_each_reflog_ent,
|
|
files_for_each_reflog_ent_reverse,
|
|
files_reflog_exists,
|
|
files_create_reflog,
|
|
files_delete_reflog,
|
|
files_reflog_expire
|
|
};
|