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691f1a28bf
This helps to notice when something's going wrong, especially on systems which lock open files. I used the following criteria when selecting the code for replacement: - it was already printing a warning for the unlink failures - it is in a function which already printing something or is called from such a function - it is in a static function, returning void and the function is only called from a builtin main function (cmd_) - it is in a function which handles emergency exit (signal handlers) - it is in a function which is obvously cleaning up the lockfiles Signed-off-by: Alex Riesen <raa.lkml@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "tag.h"
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#include "pack-refs.h"
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struct ref_to_prune {
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struct ref_to_prune *next;
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unsigned char sha1[20];
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char name[FLEX_ARRAY];
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};
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struct pack_refs_cb_data {
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unsigned int flags;
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struct ref_to_prune *ref_to_prune;
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FILE *refs_file;
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};
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static int do_not_prune(int flags)
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{
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/* If it is already packed or if it is a symref,
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* do not prune it.
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*/
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return (flags & (REF_ISSYMREF|REF_ISPACKED));
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}
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static int handle_one_ref(const char *path, const unsigned char *sha1,
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int flags, void *cb_data)
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{
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struct pack_refs_cb_data *cb = cb_data;
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int is_tag_ref;
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/* Do not pack the symbolic refs */
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if ((flags & REF_ISSYMREF))
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return 0;
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is_tag_ref = !prefixcmp(path, "refs/tags/");
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/* ALWAYS pack refs that were already packed or are tags */
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if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref && !(flags & REF_ISPACKED))
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return 0;
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fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
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if (is_tag_ref) {
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struct object *o = parse_object(sha1);
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if (o->type == OBJ_TAG) {
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o = deref_tag(o, path, 0);
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if (o)
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fprintf(cb->refs_file, "^%s\n",
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sha1_to_hex(o->sha1));
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}
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}
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if ((cb->flags & PACK_REFS_PRUNE) && !do_not_prune(flags)) {
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int namelen = strlen(path) + 1;
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struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
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hashcpy(n->sha1, sha1);
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strcpy(n->name, path);
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n->next = cb->ref_to_prune;
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cb->ref_to_prune = n;
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}
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return 0;
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}
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/* make sure nobody touched the ref, and unlink */
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static void prune_ref(struct ref_to_prune *r)
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{
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struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
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if (lock) {
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unlink_or_warn(git_path("%s", r->name));
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unlock_ref(lock);
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}
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}
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static void prune_refs(struct ref_to_prune *r)
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{
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while (r) {
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prune_ref(r);
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r = r->next;
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}
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}
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static struct lock_file packed;
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int pack_refs(unsigned int flags)
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{
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int fd;
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struct pack_refs_cb_data cbdata;
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memset(&cbdata, 0, sizeof(cbdata));
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cbdata.flags = flags;
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fd = hold_lock_file_for_update(&packed, git_path("packed-refs"),
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LOCK_DIE_ON_ERROR);
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cbdata.refs_file = fdopen(fd, "w");
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if (!cbdata.refs_file)
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die("unable to create ref-pack file structure (%s)",
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strerror(errno));
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/* perhaps other traits later as well */
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fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
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for_each_ref(handle_one_ref, &cbdata);
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if (ferror(cbdata.refs_file))
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die("failed to write ref-pack file");
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if (fflush(cbdata.refs_file) || fsync(fd) || fclose(cbdata.refs_file))
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die("failed to write ref-pack file (%s)", strerror(errno));
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/*
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* Since the lock file was fdopen()'ed and then fclose()'ed above,
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* assign -1 to the lock file descriptor so that commit_lock_file()
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* won't try to close() it.
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*/
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packed.fd = -1;
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if (commit_lock_file(&packed) < 0)
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die("unable to overwrite old ref-pack file (%s)", strerror(errno));
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if (cbdata.flags & PACK_REFS_PRUNE)
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prune_refs(cbdata.ref_to_prune);
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return 0;
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}
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