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https://github.com/git/git
synced 2024-08-27 11:39:22 +00:00
![Shawn O. Pearce](/assets/img/avatar_default.png)
If the situation is the following on the remote and L is the common base between both sides: T - tag1 S - tag2 / / L - A - O - O - B \ \ origin/master master and we have decided to fetch "master" to acquire the range L..B we can also nab tag S at the same time during the first connection, as we can clearly see from the refs advertised by upload-pack that S^{} = B and master = B. Unfortunately we still cannot nab T at the same time as we are not able to see that T^{} will also be in the range implied by L..B. Such computations must be performed on the remote side (not yet supported) or on the client side as post-processing (the current behavior). This optimization is an extension of the previous one in that it helps on projects which tend to publish both a new commit and a new tag, then lay idle for a while before publishing anything else. Most followers are able to download both the new commit and the new tag in one connection, rather than two. git.git tends to follow such patterns with its roughly once-daily updates from Junio. A protocol extension and additional server side logic would be necessary to also ensure T is grabbed on the first connection. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
652 lines
17 KiB
C
652 lines
17 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 "path-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_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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struct refspec refspec;
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refspec.src = "refs/tags/";
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refspec.dst = "refs/tags/";
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refspec.pattern = 1;
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refspec.force = 0;
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get_fetch_map(remote_refs, &refspec, &tail, 0);
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}
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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 1;
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if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
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return 1;
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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 (!*ref->name) {
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/* Not storing */
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if (verbose)
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sprintf(display, "* branch %s -> FETCH_HEAD", remote);
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return 0;
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}
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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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sprintf(display, "- %-*s %-*s -> %s",
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SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
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pretty_ref);
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return s_update_ref("updating tag", ref, 0);
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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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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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sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
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REFCOL_WIDTH, remote, pretty_ref);
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return s_update_ref(msg, ref, 0);
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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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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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sprintf(display, " %-*s %-*s -> %s", SUMMARY_WIDTH, quickref,
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REFCOL_WIDTH, remote, pretty_ref);
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return s_update_ref("fast forward", ref, 1);
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} else if (force || ref->force) {
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char quickref[84];
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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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sprintf(display, "+ %-*s %-*s -> %s (forced update)",
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SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote, pretty_ref);
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return s_update_ref("forced-update", ref, 1);
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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, 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;
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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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update_local_ref(ref, what, verbose, note);
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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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}
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fclose(fp);
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return 0;
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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, 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 path_list *list = (struct path_list *)cbdata;
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path_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 path_list existing_refs = { NULL, 0, 0, 0 };
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struct path_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;
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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 (!path_list_has_path(&existing_refs, ref_name) &&
|
|
!path_list_has_path(&new_refs, ref_name) &&
|
|
(has_sha1_file(ref->old_sha1) ||
|
|
will_fetch(head, ref->old_sha1))) {
|
|
path_list_insert(ref_name, &new_refs);
|
|
|
|
rm = alloc_ref(strlen(ref_name) + 1);
|
|
strcpy(rm->name, ref_name);
|
|
rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
|
|
strcpy(rm->peer_ref->name, ref_name);
|
|
hashcpy(rm->old_sha1, ref_sha1);
|
|
|
|
**tail = rm;
|
|
*tail = &rm->next;
|
|
}
|
|
free(ref_name);
|
|
}
|
|
path_list_clear(&existing_refs, 0);
|
|
path_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 (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_DEPTH, "0");
|
|
fetch_refs(transport, ref_map);
|
|
}
|
|
free_refs(ref_map);
|
|
}
|
|
|
|
transport_disconnect(transport);
|
|
|
|
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;
|
|
|
|
/* 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++;
|
|
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);
|
|
return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
|
|
}
|