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https://github.com/git/git
synced 2024-08-27 19:49:21 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
'git-fetch remote no-such-ref' succeeded without fetching any ref from the remote. Detect such case and report an error. Note that this makes 'git-fetch remote master master' to fail, because the remote branch 'master' matches the first refspec, and the second refspec is left unmatched, which is detected by the error checking logic. This is somewhat unintuitive, but giving the same refspec more than once to git-fetch is useless in any case so it should not be much of a problem. I'd accept a patch to change this if somebody cares enough, though. Signed-off-by: Junio C Hamano <junkio@cox.net>
477 lines
10 KiB
C
477 lines
10 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "commit.h"
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#include "tag.h"
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#include <time.h>
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#include <sys/wait.h>
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static int quiet;
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static int verbose;
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static const char fetch_pack_usage[] =
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"git-fetch-pack [-q] [-v] [--exec=upload-pack] [host:]directory <refs>...";
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static const char *exec = "git-upload-pack";
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#define COMPLETE (1U << 0)
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#define COMMON (1U << 1)
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#define COMMON_REF (1U << 2)
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#define SEEN (1U << 3)
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#define POPPED (1U << 4)
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static struct commit_list *rev_list = NULL;
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static int non_common_revs = 0, multi_ack = 0;
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static void rev_list_push(struct commit *commit, int mark)
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{
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if (!(commit->object.flags & mark)) {
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commit->object.flags |= mark;
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if (!(commit->object.parsed))
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parse_commit(commit);
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insert_by_date(commit, &rev_list);
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if (!(commit->object.flags & COMMON))
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non_common_revs++;
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}
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}
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static int rev_list_insert_ref(const char *path, const unsigned char *sha1)
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{
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struct object *o = deref_tag(parse_object(sha1), path, 0);
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if (o && o->type == commit_type)
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rev_list_push((struct commit *)o, SEEN);
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return 0;
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}
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/*
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This function marks a rev and its ancestors as common.
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In some cases, it is desirable to mark only the ancestors (for example
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when only the server does not yet know that they are common).
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*/
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static void mark_common(struct commit *commit,
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int ancestors_only, int dont_parse)
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{
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if (commit != NULL && !(commit->object.flags & COMMON)) {
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struct object *o = (struct object *)commit;
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if (!ancestors_only)
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o->flags |= COMMON;
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if (!(o->flags & SEEN))
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rev_list_push(commit, SEEN);
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else {
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struct commit_list *parents;
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if (!ancestors_only && !(o->flags & POPPED))
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non_common_revs--;
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if (!o->parsed && !dont_parse)
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parse_commit(commit);
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for (parents = commit->parents;
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parents;
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parents = parents->next)
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mark_common(parents->item, 0, dont_parse);
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}
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}
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}
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/*
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Get the next rev to send, ignoring the common.
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*/
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static const unsigned char* get_rev()
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{
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struct commit *commit = NULL;
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while (commit == NULL) {
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unsigned int mark;
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struct commit_list* parents;
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if (rev_list == NULL || non_common_revs == 0)
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return NULL;
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commit = rev_list->item;
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if (!(commit->object.parsed))
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parse_commit(commit);
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commit->object.flags |= POPPED;
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if (!(commit->object.flags & COMMON))
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non_common_revs--;
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parents = commit->parents;
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if (commit->object.flags & COMMON) {
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/* do not send "have", and ignore ancestors */
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commit = NULL;
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mark = COMMON | SEEN;
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} else if (commit->object.flags & COMMON_REF)
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/* send "have", and ignore ancestors */
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mark = COMMON | SEEN;
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else
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/* send "have", also for its ancestors */
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mark = SEEN;
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while (parents) {
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if (!(parents->item->object.flags & SEEN))
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rev_list_push(parents->item, mark);
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if (mark & COMMON)
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mark_common(parents->item, 1, 0);
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parents = parents->next;
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}
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rev_list = rev_list->next;
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}
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return commit->object.sha1;
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}
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static int find_common(int fd[2], unsigned char *result_sha1,
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struct ref *refs)
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{
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int fetching;
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int count = 0, flushes = 0, retval;
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const unsigned char *sha1;
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for_each_ref(rev_list_insert_ref);
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fetching = 0;
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for ( ; refs ; refs = refs->next) {
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unsigned char *remote = refs->old_sha1;
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struct object *o;
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/*
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* If that object is complete (i.e. it is an ancestor of a
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* local ref), we tell them we have it but do not have to
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* tell them about its ancestors, which they already know
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* about.
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*
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* We use lookup_object here because we are only
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* interested in the case we *know* the object is
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* reachable and we have already scanned it.
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*/
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if (((o = lookup_object(remote)) != NULL) &&
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(o->flags & COMPLETE)) {
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continue;
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}
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packet_write(fd[1], "want %s%s\n", sha1_to_hex(remote),
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multi_ack ? " multi_ack" : "");
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fetching++;
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}
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packet_flush(fd[1]);
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if (!fetching)
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return 1;
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flushes = 0;
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retval = -1;
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while ((sha1 = get_rev())) {
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packet_write(fd[1], "have %s\n", sha1_to_hex(sha1));
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if (verbose)
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fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
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if (!(31 & ++count)) {
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int ack;
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packet_flush(fd[1]);
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flushes++;
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/*
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* We keep one window "ahead" of the other side, and
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* will wait for an ACK only on the next one
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*/
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if (count == 32)
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continue;
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do {
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ack = get_ack(fd[0], result_sha1);
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if (verbose && ack)
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fprintf(stderr, "got ack %d %s\n", ack,
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sha1_to_hex(result_sha1));
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if (ack == 1) {
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flushes = 0;
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multi_ack = 0;
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retval = 0;
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goto done;
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} else if (ack == 2) {
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struct commit *commit =
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lookup_commit(result_sha1);
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mark_common(commit, 0, 1);
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retval = 0;
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}
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} while (ack);
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flushes--;
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}
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}
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done:
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packet_write(fd[1], "done\n");
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if (verbose)
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fprintf(stderr, "done\n");
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if (retval != 0) {
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multi_ack = 0;
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flushes++;
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}
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while (flushes || multi_ack) {
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int ack = get_ack(fd[0], result_sha1);
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if (ack) {
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if (verbose)
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fprintf(stderr, "got ack (%d) %s\n", ack,
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sha1_to_hex(result_sha1));
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if (ack == 1)
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return 0;
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multi_ack = 1;
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continue;
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}
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flushes--;
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}
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return retval;
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}
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static struct commit_list *complete = NULL;
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static int mark_complete(const char *path, const unsigned char *sha1)
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{
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struct object *o = parse_object(sha1);
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while (o && o->type == tag_type) {
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struct tag *t = (struct tag *) o;
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if (!t->tagged)
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break; /* broken repository */
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o->flags |= COMPLETE;
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o = parse_object(t->tagged->sha1);
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}
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if (o && o->type == commit_type) {
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struct commit *commit = (struct commit *)o;
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commit->object.flags |= COMPLETE;
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insert_by_date(commit, &complete);
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}
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return 0;
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}
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static void mark_recent_complete_commits(unsigned long cutoff)
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{
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while (complete && cutoff <= complete->item->date) {
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if (verbose)
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fprintf(stderr, "Marking %s as complete\n",
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sha1_to_hex(complete->item->object.sha1));
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pop_most_recent_commit(&complete, COMPLETE);
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}
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}
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static void filter_refs(struct ref **refs, int nr_match, char **match)
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{
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struct ref *prev, *current, *next;
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if (!nr_match)
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return;
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for (prev = NULL, current = *refs; current; current = next) {
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next = current->next;
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if ((!memcmp(current->name, "refs/", 5) &&
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check_ref_format(current->name + 5)) ||
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!path_match(current->name, nr_match, match)) {
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if (prev == NULL)
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*refs = next;
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else
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prev->next = next;
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free(current);
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} else
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prev = current;
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}
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}
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static int everything_local(struct ref **refs, int nr_match, char **match)
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{
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struct ref *ref;
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int retval;
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unsigned long cutoff = 0;
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track_object_refs = 0;
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save_commit_buffer = 0;
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for (ref = *refs; ref; ref = ref->next) {
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struct object *o;
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o = parse_object(ref->old_sha1);
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if (!o)
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continue;
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/* We already have it -- which may mean that we were
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* in sync with the other side at some time after
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* that (it is OK if we guess wrong here).
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*/
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if (o->type == commit_type) {
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struct commit *commit = (struct commit *)o;
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if (!cutoff || cutoff < commit->date)
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cutoff = commit->date;
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}
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}
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for_each_ref(mark_complete);
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if (cutoff)
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mark_recent_complete_commits(cutoff);
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/*
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* Mark all complete remote refs as common refs.
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* Don't mark them common yet; the server has to be told so first.
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*/
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for (ref = *refs; ref; ref = ref->next) {
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struct object *o = deref_tag(lookup_object(ref->old_sha1),
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NULL, 0);
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if (!o || o->type != commit_type || !(o->flags & COMPLETE))
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continue;
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if (!(o->flags & SEEN)) {
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rev_list_push((struct commit *)o, COMMON_REF | SEEN);
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mark_common((struct commit *)o, 1, 1);
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}
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}
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filter_refs(refs, nr_match, match);
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for (retval = 1, ref = *refs; ref ; ref = ref->next) {
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const unsigned char *remote = ref->old_sha1;
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unsigned char local[20];
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struct object *o;
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o = lookup_object(remote);
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if (!o || !(o->flags & COMPLETE)) {
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retval = 0;
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if (!verbose)
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continue;
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fprintf(stderr,
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"want %s (%s)\n", sha1_to_hex(remote),
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ref->name);
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continue;
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}
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memcpy(ref->new_sha1, local, 20);
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if (!verbose)
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continue;
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fprintf(stderr,
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"already have %s (%s)\n", sha1_to_hex(remote),
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ref->name);
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}
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return retval;
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}
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static int fetch_pack(int fd[2], int nr_match, char **match)
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{
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struct ref *ref;
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unsigned char sha1[20];
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int status;
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pid_t pid;
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get_remote_heads(fd[0], &ref, 0, NULL, 0);
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if (server_supports("multi_ack")) {
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if (verbose)
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fprintf(stderr, "Server supports multi_ack\n");
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multi_ack = 1;
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}
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if (!ref) {
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packet_flush(fd[1]);
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die("no matching remote head");
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}
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if (everything_local(&ref, nr_match, match)) {
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packet_flush(fd[1]);
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goto all_done;
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}
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if (find_common(fd, sha1, ref) < 0)
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fprintf(stderr, "warning: no common commits\n");
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pid = fork();
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if (pid < 0)
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die("git-fetch-pack: unable to fork off git-unpack-objects");
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if (!pid) {
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dup2(fd[0], 0);
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close(fd[0]);
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close(fd[1]);
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execlp("git-unpack-objects", "git-unpack-objects",
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quiet ? "-q" : NULL, NULL);
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die("git-unpack-objects exec failed");
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}
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close(fd[0]);
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close(fd[1]);
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while (waitpid(pid, &status, 0) < 0) {
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if (errno != EINTR)
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die("waiting for git-unpack-objects: %s", strerror(errno));
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}
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if (WIFEXITED(status)) {
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int code = WEXITSTATUS(status);
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if (code)
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die("git-unpack-objects died with error code %d", code);
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all_done:
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while (ref) {
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printf("%s %s\n",
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sha1_to_hex(ref->old_sha1), ref->name);
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ref = ref->next;
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}
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return 0;
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}
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if (WIFSIGNALED(status)) {
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int sig = WTERMSIG(status);
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die("git-unpack-objects died of signal %d", sig);
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}
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die("Sherlock Holmes! git-unpack-objects died of unnatural causes %d!", status);
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}
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int main(int argc, char **argv)
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{
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int i, ret, nr_heads;
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char *dest = NULL, **heads;
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int fd[2];
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pid_t pid;
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nr_heads = 0;
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heads = NULL;
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for (i = 1; i < argc; i++) {
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char *arg = argv[i];
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if (*arg == '-') {
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if (!strncmp("--exec=", arg, 7)) {
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exec = arg + 7;
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continue;
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}
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if (!strcmp("-q", arg)) {
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quiet = 1;
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continue;
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}
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if (!strcmp("-v", arg)) {
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verbose = 1;
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continue;
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}
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usage(fetch_pack_usage);
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}
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dest = arg;
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heads = argv + i + 1;
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nr_heads = argc - i - 1;
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break;
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}
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if (!dest)
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usage(fetch_pack_usage);
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pid = git_connect(fd, dest, exec);
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if (pid < 0)
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return 1;
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ret = fetch_pack(fd, nr_heads, heads);
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close(fd[0]);
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close(fd[1]);
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finish_connect(pid);
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if (!ret && nr_heads) {
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/* If the heads to pull were given, we should have
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* consumed all of them by matching the remote.
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* Otherwise, 'git-fetch remote no-such-ref' would
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* silently succeed without issuing an error.
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*/
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for (i = 0; i < nr_heads; i++)
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if (heads[i] && heads[i][0]) {
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error("no such remote ref %s", heads[i]);
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ret = 1;
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}
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}
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return ret;
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}
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