mirror of
https://github.com/git/git.git
synced 2024-10-31 14:27:54 +01:00
05207a2881
User notifications are presented as 'git cmd', and code comments are presented as '"cmd"' or 'git's cmd', rather than 'git-cmd'. Signed-off-by: Heikki Orsila <heikki.orsila@iki.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
668 lines
18 KiB
C
668 lines
18 KiB
C
/*
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* "git fetch"
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*/
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#include "cache.h"
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#include "refs.h"
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#include "commit.h"
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#include "builtin.h"
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#include "string-list.h"
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#include "remote.h"
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#include "transport.h"
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#include "run-command.h"
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#include "parse-options.h"
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static const char * const builtin_fetch_usage[] = {
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"git fetch [options] [<repository> <refspec>...]",
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NULL
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};
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enum {
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TAGS_UNSET = 0,
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TAGS_DEFAULT = 1,
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TAGS_SET = 2
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};
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static int append, force, keep, update_head_ok, verbose, quiet;
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static int tags = TAGS_DEFAULT;
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static const char *depth;
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static const char *upload_pack;
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static struct strbuf default_rla = STRBUF_INIT;
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static struct transport *transport;
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static struct option builtin_fetch_options[] = {
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OPT__QUIET(&quiet),
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OPT__VERBOSE(&verbose),
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OPT_BOOLEAN('a', "append", &append,
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"append to .git/FETCH_HEAD instead of overwriting"),
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OPT_STRING(0, "upload-pack", &upload_pack, "PATH",
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"path to upload pack on remote end"),
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OPT_BOOLEAN('f', "force", &force,
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"force overwrite of local branch"),
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OPT_SET_INT('t', "tags", &tags,
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"fetch all tags and associated objects", TAGS_SET),
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OPT_SET_INT('n', NULL, &tags,
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"do not fetch all tags (--no-tags)", TAGS_UNSET),
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OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
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OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
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"allow updating of HEAD ref"),
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OPT_STRING(0, "depth", &depth, "DEPTH",
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"deepen history of shallow clone"),
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OPT_END()
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};
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static void unlock_pack(void)
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{
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if (transport)
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transport_unlock_pack(transport);
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}
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static void unlock_pack_on_signal(int signo)
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{
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unlock_pack();
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signal(SIGINT, SIG_DFL);
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raise(signo);
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}
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static void add_merge_config(struct ref **head,
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const struct ref *remote_refs,
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struct branch *branch,
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struct ref ***tail)
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{
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int i;
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for (i = 0; i < branch->merge_nr; i++) {
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struct ref *rm, **old_tail = *tail;
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struct refspec refspec;
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for (rm = *head; rm; rm = rm->next) {
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if (branch_merge_matches(branch, i, rm->name)) {
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rm->merge = 1;
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break;
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}
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}
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if (rm)
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continue;
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/*
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* Not fetched to a tracking branch? We need to fetch
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* it anyway to allow this branch's "branch.$name.merge"
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* to be honored by 'git pull', but we do not have to
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* fail if branch.$name.merge is misconfigured to point
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* at a nonexisting branch. If we were indeed called by
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* 'git pull', it will notice the misconfiguration because
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* there is no entry in the resulting FETCH_HEAD marked
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* for merging.
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*/
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refspec.src = branch->merge[i]->src;
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refspec.dst = NULL;
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refspec.pattern = 0;
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refspec.force = 0;
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get_fetch_map(remote_refs, &refspec, tail, 1);
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for (rm = *old_tail; rm; rm = rm->next)
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rm->merge = 1;
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}
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}
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static void find_non_local_tags(struct transport *transport,
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struct ref **head,
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struct ref ***tail);
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static struct ref *get_ref_map(struct transport *transport,
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struct refspec *refs, int ref_count, int tags,
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int *autotags)
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{
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int i;
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struct ref *rm;
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struct ref *ref_map = NULL;
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struct ref **tail = &ref_map;
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const struct ref *remote_refs = transport_get_remote_refs(transport);
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if (ref_count || tags == TAGS_SET) {
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for (i = 0; i < ref_count; i++) {
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get_fetch_map(remote_refs, &refs[i], &tail, 0);
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if (refs[i].dst && refs[i].dst[0])
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*autotags = 1;
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}
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/* Merge everything on the command line, but not --tags */
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for (rm = ref_map; rm; rm = rm->next)
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rm->merge = 1;
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if (tags == TAGS_SET)
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get_fetch_map(remote_refs, tag_refspec, &tail, 0);
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} else {
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/* Use the defaults */
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struct remote *remote = transport->remote;
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struct branch *branch = branch_get(NULL);
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int has_merge = branch_has_merge_config(branch);
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if (remote && (remote->fetch_refspec_nr || has_merge)) {
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for (i = 0; i < remote->fetch_refspec_nr; i++) {
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get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
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if (remote->fetch[i].dst &&
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remote->fetch[i].dst[0])
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*autotags = 1;
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if (!i && !has_merge && ref_map &&
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!remote->fetch[0].pattern)
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ref_map->merge = 1;
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}
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/*
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* if the remote we're fetching from is the same
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* as given in branch.<name>.remote, we add the
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* ref given in branch.<name>.merge, too.
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*/
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if (has_merge &&
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!strcmp(branch->remote_name, remote->name))
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add_merge_config(&ref_map, remote_refs, branch, &tail);
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} else {
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ref_map = get_remote_ref(remote_refs, "HEAD");
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if (!ref_map)
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die("Couldn't find remote ref HEAD");
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ref_map->merge = 1;
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tail = &ref_map->next;
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}
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}
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if (tags == TAGS_DEFAULT && *autotags)
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find_non_local_tags(transport, &ref_map, &tail);
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ref_remove_duplicates(ref_map);
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return ref_map;
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}
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static int s_update_ref(const char *action,
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struct ref *ref,
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int check_old)
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{
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char msg[1024];
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char *rla = getenv("GIT_REFLOG_ACTION");
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static struct ref_lock *lock;
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if (!rla)
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rla = default_rla.buf;
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snprintf(msg, sizeof(msg), "%s: %s", rla, action);
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lock = lock_any_ref_for_update(ref->name,
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check_old ? ref->old_sha1 : NULL, 0);
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if (!lock)
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return 2;
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if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
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return 2;
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return 0;
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}
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#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
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#define REFCOL_WIDTH 10
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static int update_local_ref(struct ref *ref,
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const char *remote,
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int verbose,
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char *display)
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{
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struct commit *current = NULL, *updated;
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enum object_type type;
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struct branch *current_branch = branch_get(NULL);
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const char *pretty_ref = ref->name + (
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!prefixcmp(ref->name, "refs/heads/") ? 11 :
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!prefixcmp(ref->name, "refs/tags/") ? 10 :
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!prefixcmp(ref->name, "refs/remotes/") ? 13 :
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0);
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*display = 0;
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type = sha1_object_info(ref->new_sha1, NULL);
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if (type < 0)
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die("object %s not found", sha1_to_hex(ref->new_sha1));
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if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
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if (verbose)
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sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
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"[up to date]", REFCOL_WIDTH, remote,
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pretty_ref);
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return 0;
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}
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if (current_branch &&
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!strcmp(ref->name, current_branch->name) &&
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!(update_head_ok || is_bare_repository()) &&
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!is_null_sha1(ref->old_sha1)) {
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/*
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* If this is the head, and it's not okay to update
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* the head, and the old value of the head isn't empty...
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*/
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sprintf(display, "! %-*s %-*s -> %s (can't fetch in current branch)",
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SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
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pretty_ref);
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return 1;
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}
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if (!is_null_sha1(ref->old_sha1) &&
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!prefixcmp(ref->name, "refs/tags/")) {
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int r;
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r = s_update_ref("updating tag", ref, 0);
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sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '-',
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SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
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pretty_ref, r ? " (unable to update local ref)" : "");
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return r;
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}
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current = lookup_commit_reference_gently(ref->old_sha1, 1);
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updated = lookup_commit_reference_gently(ref->new_sha1, 1);
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if (!current || !updated) {
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const char *msg;
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const char *what;
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int r;
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if (!strncmp(ref->name, "refs/tags/", 10)) {
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msg = "storing tag";
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what = "[new tag]";
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}
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else {
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msg = "storing head";
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what = "[new branch]";
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}
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r = s_update_ref(msg, ref, 0);
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sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : '*',
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SUMMARY_WIDTH, what, REFCOL_WIDTH, remote, pretty_ref,
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r ? " (unable to update local ref)" : "");
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return r;
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}
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if (in_merge_bases(current, &updated, 1)) {
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char quickref[83];
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int r;
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strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
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strcat(quickref, "..");
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strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
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r = s_update_ref("fast forward", ref, 1);
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sprintf(display, "%c %-*s %-*s -> %s%s", r ? '!' : ' ',
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SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
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pretty_ref, r ? " (unable to update local ref)" : "");
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return r;
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} else if (force || ref->force) {
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char quickref[84];
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int r;
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strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
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strcat(quickref, "...");
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strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
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r = s_update_ref("forced-update", ref, 1);
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sprintf(display, "%c %-*s %-*s -> %s (%s)", r ? '!' : '+',
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SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote,
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pretty_ref,
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r ? "unable to update local ref" : "forced update");
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return r;
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} else {
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sprintf(display, "! %-*s %-*s -> %s (non fast forward)",
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SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
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pretty_ref);
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return 1;
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}
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}
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static int store_updated_refs(const char *url, const char *remote_name,
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struct ref *ref_map)
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{
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FILE *fp;
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struct commit *commit;
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int url_len, i, note_len, shown_url = 0, rc = 0;
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char note[1024];
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const char *what, *kind;
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struct ref *rm;
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char *filename = git_path("FETCH_HEAD");
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fp = fopen(filename, "a");
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if (!fp)
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return error("cannot open %s: %s\n", filename, strerror(errno));
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for (rm = ref_map; rm; rm = rm->next) {
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struct ref *ref = NULL;
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if (rm->peer_ref) {
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ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
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strcpy(ref->name, rm->peer_ref->name);
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hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
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hashcpy(ref->new_sha1, rm->old_sha1);
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ref->force = rm->peer_ref->force;
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}
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commit = lookup_commit_reference_gently(rm->old_sha1, 1);
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if (!commit)
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rm->merge = 0;
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if (!strcmp(rm->name, "HEAD")) {
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kind = "";
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what = "";
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}
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else if (!prefixcmp(rm->name, "refs/heads/")) {
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kind = "branch";
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what = rm->name + 11;
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}
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else if (!prefixcmp(rm->name, "refs/tags/")) {
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kind = "tag";
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what = rm->name + 10;
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}
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else if (!prefixcmp(rm->name, "refs/remotes/")) {
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kind = "remote branch";
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what = rm->name + 13;
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}
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else {
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kind = "";
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what = rm->name;
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}
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url_len = strlen(url);
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for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
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;
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url_len = i + 1;
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if (4 < i && !strncmp(".git", url + i - 3, 4))
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url_len = i - 3;
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note_len = 0;
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if (*what) {
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if (*kind)
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note_len += sprintf(note + note_len, "%s ",
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kind);
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note_len += sprintf(note + note_len, "'%s' of ", what);
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}
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note_len += sprintf(note + note_len, "%.*s", url_len, url);
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fprintf(fp, "%s\t%s\t%s\n",
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sha1_to_hex(commit ? commit->object.sha1 :
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rm->old_sha1),
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rm->merge ? "" : "not-for-merge",
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note);
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if (ref)
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rc |= update_local_ref(ref, what, verbose, note);
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else
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sprintf(note, "* %-*s %-*s -> FETCH_HEAD",
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SUMMARY_WIDTH, *kind ? kind : "branch",
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REFCOL_WIDTH, *what ? what : "HEAD");
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if (*note) {
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if (!shown_url) {
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fprintf(stderr, "From %.*s\n",
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url_len, url);
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shown_url = 1;
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}
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fprintf(stderr, " %s\n", note);
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}
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}
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fclose(fp);
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if (rc & 2)
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error("some local refs could not be updated; try running\n"
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" 'git remote prune %s' to remove any old, conflicting "
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"branches", remote_name);
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return rc;
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}
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/*
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* We would want to bypass the object transfer altogether if
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* everything we are going to fetch already exists and connected
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* locally.
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*
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* The refs we are going to fetch are in to_fetch (nr_heads in
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* total). If running
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*
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* $ git rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
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*
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* does not error out, that means everything reachable from the
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* refs we are going to fetch exists and is connected to some of
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* our existing refs.
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*/
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static int quickfetch(struct ref *ref_map)
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{
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struct child_process revlist;
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struct ref *ref;
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char **argv;
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int i, err;
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/*
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* If we are deepening a shallow clone we already have these
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* objects reachable. Running rev-list here will return with
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* a good (0) exit status and we'll bypass the fetch that we
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* really need to perform. Claiming failure now will ensure
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* we perform the network exchange to deepen our history.
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*/
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if (depth)
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return -1;
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for (i = 0, ref = ref_map; ref; ref = ref->next)
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i++;
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if (!i)
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return 0;
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argv = xmalloc(sizeof(*argv) * (i + 6));
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i = 0;
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argv[i++] = xstrdup("rev-list");
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argv[i++] = xstrdup("--quiet");
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argv[i++] = xstrdup("--objects");
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for (ref = ref_map; ref; ref = ref->next)
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argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
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argv[i++] = xstrdup("--not");
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argv[i++] = xstrdup("--all");
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argv[i++] = NULL;
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memset(&revlist, 0, sizeof(revlist));
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revlist.argv = (const char**)argv;
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revlist.git_cmd = 1;
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revlist.no_stdin = 1;
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revlist.no_stdout = 1;
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revlist.no_stderr = 1;
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err = run_command(&revlist);
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for (i = 0; argv[i]; i++)
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free(argv[i]);
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free(argv);
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return err;
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}
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static int fetch_refs(struct transport *transport, struct ref *ref_map)
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{
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int ret = quickfetch(ref_map);
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if (ret)
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ret = transport_fetch_refs(transport, ref_map);
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if (!ret)
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ret |= store_updated_refs(transport->url,
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transport->remote->name,
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ref_map);
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transport_unlock_pack(transport);
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return ret;
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}
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static int add_existing(const char *refname, const unsigned char *sha1,
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int flag, void *cbdata)
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{
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struct string_list *list = (struct string_list *)cbdata;
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string_list_insert(refname, list);
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return 0;
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}
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static int will_fetch(struct ref **head, const unsigned char *sha1)
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{
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struct ref *rm = *head;
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while (rm) {
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if (!hashcmp(rm->old_sha1, sha1))
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return 1;
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rm = rm->next;
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}
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return 0;
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}
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static void find_non_local_tags(struct transport *transport,
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struct ref **head,
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struct ref ***tail)
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{
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struct string_list existing_refs = { NULL, 0, 0, 0 };
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struct string_list new_refs = { NULL, 0, 0, 1 };
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char *ref_name;
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int ref_name_len;
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const unsigned char *ref_sha1;
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const struct ref *tag_ref;
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struct ref *rm = NULL;
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const struct ref *ref;
|
|
|
|
for_each_ref(add_existing, &existing_refs);
|
|
for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
|
|
if (prefixcmp(ref->name, "refs/tags"))
|
|
continue;
|
|
|
|
ref_name = xstrdup(ref->name);
|
|
ref_name_len = strlen(ref_name);
|
|
ref_sha1 = ref->old_sha1;
|
|
|
|
if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
|
|
ref_name[ref_name_len - 3] = 0;
|
|
tag_ref = transport_get_remote_refs(transport);
|
|
while (tag_ref) {
|
|
if (!strcmp(tag_ref->name, ref_name)) {
|
|
ref_sha1 = tag_ref->old_sha1;
|
|
break;
|
|
}
|
|
tag_ref = tag_ref->next;
|
|
}
|
|
}
|
|
|
|
if (!string_list_has_string(&existing_refs, ref_name) &&
|
|
!string_list_has_string(&new_refs, ref_name) &&
|
|
(has_sha1_file(ref->old_sha1) ||
|
|
will_fetch(head, ref->old_sha1))) {
|
|
string_list_insert(ref_name, &new_refs);
|
|
|
|
rm = alloc_ref_from_str(ref_name);
|
|
rm->peer_ref = alloc_ref_from_str(ref_name);
|
|
hashcpy(rm->old_sha1, ref_sha1);
|
|
|
|
**tail = rm;
|
|
*tail = &rm->next;
|
|
}
|
|
free(ref_name);
|
|
}
|
|
string_list_clear(&existing_refs, 0);
|
|
string_list_clear(&new_refs, 0);
|
|
}
|
|
|
|
static int do_fetch(struct transport *transport,
|
|
struct refspec *refs, int ref_count)
|
|
{
|
|
struct ref *ref_map;
|
|
struct ref *rm;
|
|
int autotags = (transport->remote->fetch_tags == 1);
|
|
if (transport->remote->fetch_tags == 2 && tags != TAGS_UNSET)
|
|
tags = TAGS_SET;
|
|
if (transport->remote->fetch_tags == -1)
|
|
tags = TAGS_UNSET;
|
|
|
|
if (!transport->get_refs_list || !transport->fetch)
|
|
die("Don't know how to fetch from %s", transport->url);
|
|
|
|
/* if not appending, truncate FETCH_HEAD */
|
|
if (!append) {
|
|
char *filename = git_path("FETCH_HEAD");
|
|
FILE *fp = fopen(filename, "w");
|
|
if (!fp)
|
|
return error("cannot open %s: %s\n", filename, strerror(errno));
|
|
fclose(fp);
|
|
}
|
|
|
|
ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
|
|
|
|
for (rm = ref_map; rm; rm = rm->next) {
|
|
if (rm->peer_ref)
|
|
read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
|
|
}
|
|
|
|
if (tags == TAGS_DEFAULT && autotags)
|
|
transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
|
|
if (fetch_refs(transport, ref_map)) {
|
|
free_refs(ref_map);
|
|
return 1;
|
|
}
|
|
free_refs(ref_map);
|
|
|
|
/* if neither --no-tags nor --tags was specified, do automated tag
|
|
* following ... */
|
|
if (tags == TAGS_DEFAULT && autotags) {
|
|
struct ref **tail = &ref_map;
|
|
ref_map = NULL;
|
|
find_non_local_tags(transport, &ref_map, &tail);
|
|
if (ref_map) {
|
|
transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
|
|
transport_set_option(transport, TRANS_OPT_DEPTH, "0");
|
|
fetch_refs(transport, ref_map);
|
|
}
|
|
free_refs(ref_map);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void set_option(const char *name, const char *value)
|
|
{
|
|
int r = transport_set_option(transport, name, value);
|
|
if (r < 0)
|
|
die("Option \"%s\" value \"%s\" is not valid for %s\n",
|
|
name, value, transport->url);
|
|
if (r > 0)
|
|
warning("Option \"%s\" is ignored for %s\n",
|
|
name, transport->url);
|
|
}
|
|
|
|
int cmd_fetch(int argc, const char **argv, const char *prefix)
|
|
{
|
|
struct remote *remote;
|
|
int i;
|
|
static const char **refs = NULL;
|
|
int ref_nr = 0;
|
|
int exit_code;
|
|
|
|
/* Record the command line for the reflog */
|
|
strbuf_addstr(&default_rla, "fetch");
|
|
for (i = 1; i < argc; i++)
|
|
strbuf_addf(&default_rla, " %s", argv[i]);
|
|
|
|
argc = parse_options(argc, argv,
|
|
builtin_fetch_options, builtin_fetch_usage, 0);
|
|
|
|
if (argc == 0)
|
|
remote = remote_get(NULL);
|
|
else
|
|
remote = remote_get(argv[0]);
|
|
|
|
transport = transport_get(remote, remote->url[0]);
|
|
if (verbose >= 2)
|
|
transport->verbose = 1;
|
|
if (quiet)
|
|
transport->verbose = -1;
|
|
if (upload_pack)
|
|
set_option(TRANS_OPT_UPLOADPACK, upload_pack);
|
|
if (keep)
|
|
set_option(TRANS_OPT_KEEP, "yes");
|
|
if (depth)
|
|
set_option(TRANS_OPT_DEPTH, depth);
|
|
|
|
if (!transport->url)
|
|
die("Where do you want to fetch from today?");
|
|
|
|
if (argc > 1) {
|
|
int j = 0;
|
|
refs = xcalloc(argc + 1, sizeof(const char *));
|
|
for (i = 1; i < argc; i++) {
|
|
if (!strcmp(argv[i], "tag")) {
|
|
char *ref;
|
|
i++;
|
|
if (i >= argc)
|
|
die("You need to specify a tag name.");
|
|
ref = xmalloc(strlen(argv[i]) * 2 + 22);
|
|
strcpy(ref, "refs/tags/");
|
|
strcat(ref, argv[i]);
|
|
strcat(ref, ":refs/tags/");
|
|
strcat(ref, argv[i]);
|
|
refs[j++] = ref;
|
|
} else
|
|
refs[j++] = argv[i];
|
|
}
|
|
refs[j] = NULL;
|
|
ref_nr = j;
|
|
}
|
|
|
|
signal(SIGINT, unlock_pack_on_signal);
|
|
atexit(unlock_pack);
|
|
exit_code = do_fetch(transport,
|
|
parse_fetch_refspec(ref_nr, refs), ref_nr);
|
|
transport_disconnect(transport);
|
|
transport = NULL;
|
|
return exit_code;
|
|
}
|