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![Thomas Rast](/assets/img/avatar_default.png)
memcpy() may only be used for disjoint memory areas, but when invoked from cmd_fetch_pack(), we have my_args == &args. (The argument cannot be removed entirely because transport.c invokes with its own variable.) Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
830 lines
19 KiB
C
830 lines
19 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 "exec_cmd.h"
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#include "pack.h"
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#include "sideband.h"
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#include "fetch-pack.h"
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#include "remote.h"
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#include "run-command.h"
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static int transfer_unpack_limit = -1;
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static int fetch_unpack_limit = -1;
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static int unpack_limit = 100;
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static struct fetch_pack_args args = {
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/* .uploadpack = */ "git-upload-pack",
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};
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static const char fetch_pack_usage[] =
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"git fetch-pack [--all] [--quiet|-q] [--keep|-k] [--thin] [--include-tag] [--upload-pack=<git-upload-pack>] [--depth=<n>] [--no-progress] [-v] [<host>:]<directory> [<refs>...]";
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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 int marked;
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/*
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* After sending this many "have"s if we do not get any new ACK , we
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* give up traversing our history.
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*/
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#define MAX_IN_VAIN 256
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static struct commit_list *rev_list;
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static int non_common_revs, multi_ack, use_sideband;
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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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if (parse_commit(commit))
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return;
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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, int flag, void *cb_data)
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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 == OBJ_COMMIT)
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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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static int clear_marks(const char *path, const unsigned char *sha1, int flag, void *cb_data)
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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 == OBJ_COMMIT)
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clear_commit_marks((struct commit *)o,
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COMMON | COMMON_REF | SEEN | POPPED);
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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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if (parse_commit(commit))
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return;
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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(void)
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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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parents = commit->parents;
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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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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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unsigned in_vain = 0;
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int got_continue = 0;
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if (marked)
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for_each_ref(clear_marks, NULL);
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marked = 1;
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for_each_ref(rev_list_insert_ref, NULL);
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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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if (!fetching)
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packet_write(fd[1], "want %s%s%s%s%s%s%s%s\n",
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sha1_to_hex(remote),
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(multi_ack ? " multi_ack" : ""),
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(use_sideband == 2 ? " side-band-64k" : ""),
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(use_sideband == 1 ? " side-band" : ""),
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(args.use_thin_pack ? " thin-pack" : ""),
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(args.no_progress ? " no-progress" : ""),
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(args.include_tag ? " include-tag" : ""),
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" ofs-delta");
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else
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packet_write(fd[1], "want %s\n", sha1_to_hex(remote));
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fetching++;
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}
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if (is_repository_shallow())
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write_shallow_commits(fd[1], 1);
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if (args.depth > 0)
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packet_write(fd[1], "deepen %d", args.depth);
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packet_flush(fd[1]);
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if (!fetching)
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return 1;
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if (args.depth > 0) {
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char line[1024];
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unsigned char sha1[20];
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int len;
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while ((len = packet_read_line(fd[0], line, sizeof(line)))) {
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if (!prefixcmp(line, "shallow ")) {
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if (get_sha1_hex(line + 8, sha1))
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die("invalid shallow line: %s", line);
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register_shallow(sha1);
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continue;
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}
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if (!prefixcmp(line, "unshallow ")) {
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if (get_sha1_hex(line + 10, sha1))
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die("invalid unshallow line: %s", line);
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if (!lookup_object(sha1))
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die("object not found: %s", line);
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/* make sure that it is parsed as shallow */
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if (!parse_object(sha1))
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die("error in object: %s", line);
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if (unregister_shallow(sha1))
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die("no shallow found: %s", line);
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continue;
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}
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die("expected shallow/unshallow, got %s", line);
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}
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}
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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 (args.verbose)
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fprintf(stderr, "have %s\n", sha1_to_hex(sha1));
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in_vain++;
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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 (args.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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in_vain = 0;
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got_continue = 1;
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}
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} while (ack);
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flushes--;
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if (got_continue && MAX_IN_VAIN < in_vain) {
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if (args.verbose)
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fprintf(stderr, "giving up\n");
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break; /* give up */
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}
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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 (args.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 (args.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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/* it is no error to fetch into a completely empty repo */
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return count ? retval : 0;
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}
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static struct commit_list *complete;
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static int mark_complete(const char *path, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct object *o = parse_object(sha1);
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while (o && o->type == OBJ_TAG) {
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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 == OBJ_COMMIT) {
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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 (args.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 **return_refs;
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struct ref *newlist = NULL;
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struct ref **newtail = &newlist;
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struct ref *ref, *next;
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struct ref *fastarray[32];
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if (nr_match && !args.fetch_all) {
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if (ARRAY_SIZE(fastarray) < nr_match)
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return_refs = xcalloc(nr_match, sizeof(struct ref *));
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else {
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return_refs = fastarray;
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memset(return_refs, 0, sizeof(struct ref *) * nr_match);
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}
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}
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else
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return_refs = NULL;
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for (ref = *refs; ref; ref = next) {
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next = ref->next;
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if (!memcmp(ref->name, "refs/", 5) &&
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check_ref_format(ref->name + 5))
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; /* trash */
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else if (args.fetch_all &&
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(!args.depth || prefixcmp(ref->name, "refs/tags/") )) {
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*newtail = ref;
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ref->next = NULL;
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newtail = &ref->next;
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continue;
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}
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else {
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int order = path_match(ref->name, nr_match, match);
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if (order) {
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return_refs[order-1] = ref;
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continue; /* we will link it later */
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}
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}
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free(ref);
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}
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if (!args.fetch_all) {
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int i;
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for (i = 0; i < nr_match; i++) {
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ref = return_refs[i];
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if (ref) {
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*newtail = ref;
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ref->next = NULL;
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newtail = &ref->next;
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}
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}
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if (return_refs != fastarray)
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free(return_refs);
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}
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*refs = newlist;
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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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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 == OBJ_COMMIT) {
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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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if (!args.depth) {
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for_each_ref(mark_complete, NULL);
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if (cutoff)
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mark_recent_complete_commits(cutoff);
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}
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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 != OBJ_COMMIT || !(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 (!args.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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hashcpy(ref->new_sha1, local);
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if (!args.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 sideband_demux(int fd, void *data)
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{
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int *xd = data;
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return recv_sideband("fetch-pack", xd[0], fd, 2);
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}
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static int get_pack(int xd[2], char **pack_lockfile)
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{
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struct async demux;
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const char *argv[20];
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char keep_arg[256];
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char hdr_arg[256];
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const char **av;
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int do_keep = args.keep_pack;
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struct child_process cmd;
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memset(&demux, 0, sizeof(demux));
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if (use_sideband) {
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/* xd[] is talking with upload-pack; subprocess reads from
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* xd[0], spits out band#2 to stderr, and feeds us band#1
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* through demux->out.
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*/
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demux.proc = sideband_demux;
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demux.data = xd;
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if (start_async(&demux))
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die("fetch-pack: unable to fork off sideband"
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" demultiplexer");
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}
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else
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demux.out = xd[0];
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memset(&cmd, 0, sizeof(cmd));
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cmd.argv = argv;
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av = argv;
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*hdr_arg = 0;
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if (!args.keep_pack && unpack_limit) {
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struct pack_header header;
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if (read_pack_header(demux.out, &header))
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die("protocol error: bad pack header");
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snprintf(hdr_arg, sizeof(hdr_arg),
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"--pack_header=%"PRIu32",%"PRIu32,
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ntohl(header.hdr_version), ntohl(header.hdr_entries));
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if (ntohl(header.hdr_entries) < unpack_limit)
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do_keep = 0;
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else
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do_keep = 1;
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}
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if (do_keep) {
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if (pack_lockfile)
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cmd.out = -1;
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*av++ = "index-pack";
|
|
*av++ = "--stdin";
|
|
if (!args.quiet && !args.no_progress)
|
|
*av++ = "-v";
|
|
if (args.use_thin_pack)
|
|
*av++ = "--fix-thin";
|
|
if (args.lock_pack || unpack_limit) {
|
|
int s = sprintf(keep_arg,
|
|
"--keep=fetch-pack %d on ", getpid());
|
|
if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
|
|
strcpy(keep_arg + s, "localhost");
|
|
*av++ = keep_arg;
|
|
}
|
|
}
|
|
else {
|
|
*av++ = "unpack-objects";
|
|
if (args.quiet)
|
|
*av++ = "-q";
|
|
}
|
|
if (*hdr_arg)
|
|
*av++ = hdr_arg;
|
|
*av++ = NULL;
|
|
|
|
cmd.in = demux.out;
|
|
cmd.git_cmd = 1;
|
|
if (start_command(&cmd))
|
|
die("fetch-pack: unable to fork off %s", argv[0]);
|
|
if (do_keep && pack_lockfile) {
|
|
*pack_lockfile = index_pack_lockfile(cmd.out);
|
|
close(cmd.out);
|
|
}
|
|
|
|
if (finish_command(&cmd))
|
|
die("%s failed", argv[0]);
|
|
if (use_sideband && finish_async(&demux))
|
|
die("error in sideband demultiplexer");
|
|
return 0;
|
|
}
|
|
|
|
static struct ref *do_fetch_pack(int fd[2],
|
|
const struct ref *orig_ref,
|
|
int nr_match,
|
|
char **match,
|
|
char **pack_lockfile)
|
|
{
|
|
struct ref *ref = copy_ref_list(orig_ref);
|
|
unsigned char sha1[20];
|
|
|
|
if (is_repository_shallow() && !server_supports("shallow"))
|
|
die("Server does not support shallow clients");
|
|
if (server_supports("multi_ack")) {
|
|
if (args.verbose)
|
|
fprintf(stderr, "Server supports multi_ack\n");
|
|
multi_ack = 1;
|
|
}
|
|
if (server_supports("side-band-64k")) {
|
|
if (args.verbose)
|
|
fprintf(stderr, "Server supports side-band-64k\n");
|
|
use_sideband = 2;
|
|
}
|
|
else if (server_supports("side-band")) {
|
|
if (args.verbose)
|
|
fprintf(stderr, "Server supports side-band\n");
|
|
use_sideband = 1;
|
|
}
|
|
if (everything_local(&ref, nr_match, match)) {
|
|
packet_flush(fd[1]);
|
|
goto all_done;
|
|
}
|
|
if (find_common(fd, sha1, ref) < 0)
|
|
if (!args.keep_pack)
|
|
/* When cloning, it is not unusual to have
|
|
* no common commit.
|
|
*/
|
|
fprintf(stderr, "warning: no common commits\n");
|
|
|
|
if (get_pack(fd, pack_lockfile))
|
|
die("git fetch-pack: fetch failed.");
|
|
|
|
all_done:
|
|
return ref;
|
|
}
|
|
|
|
static int remove_duplicates(int nr_heads, char **heads)
|
|
{
|
|
int src, dst;
|
|
|
|
for (src = dst = 0; src < nr_heads; src++) {
|
|
/* If heads[src] is different from any of
|
|
* heads[0..dst], push it in.
|
|
*/
|
|
int i;
|
|
for (i = 0; i < dst; i++) {
|
|
if (!strcmp(heads[i], heads[src]))
|
|
break;
|
|
}
|
|
if (i < dst)
|
|
continue;
|
|
if (src != dst)
|
|
heads[dst] = heads[src];
|
|
dst++;
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
static int fetch_pack_config(const char *var, const char *value, void *cb)
|
|
{
|
|
if (strcmp(var, "fetch.unpacklimit") == 0) {
|
|
fetch_unpack_limit = git_config_int(var, value);
|
|
return 0;
|
|
}
|
|
|
|
if (strcmp(var, "transfer.unpacklimit") == 0) {
|
|
transfer_unpack_limit = git_config_int(var, value);
|
|
return 0;
|
|
}
|
|
|
|
return git_default_config(var, value, cb);
|
|
}
|
|
|
|
static struct lock_file lock;
|
|
|
|
static void fetch_pack_setup(void)
|
|
{
|
|
static int did_setup;
|
|
if (did_setup)
|
|
return;
|
|
git_config(fetch_pack_config, NULL);
|
|
if (0 <= transfer_unpack_limit)
|
|
unpack_limit = transfer_unpack_limit;
|
|
else if (0 <= fetch_unpack_limit)
|
|
unpack_limit = fetch_unpack_limit;
|
|
did_setup = 1;
|
|
}
|
|
|
|
int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
|
|
{
|
|
int i, ret, nr_heads;
|
|
struct ref *ref = NULL;
|
|
char *dest = NULL, **heads;
|
|
int fd[2];
|
|
struct child_process *conn;
|
|
|
|
nr_heads = 0;
|
|
heads = NULL;
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
|
|
if (*arg == '-') {
|
|
if (!prefixcmp(arg, "--upload-pack=")) {
|
|
args.uploadpack = arg + 14;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--exec=")) {
|
|
args.uploadpack = arg + 7;
|
|
continue;
|
|
}
|
|
if (!strcmp("--quiet", arg) || !strcmp("-q", arg)) {
|
|
args.quiet = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--keep", arg) || !strcmp("-k", arg)) {
|
|
args.lock_pack = args.keep_pack;
|
|
args.keep_pack = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--thin", arg)) {
|
|
args.use_thin_pack = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--include-tag", arg)) {
|
|
args.include_tag = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("--all", arg)) {
|
|
args.fetch_all = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp("-v", arg)) {
|
|
args.verbose = 1;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--depth=")) {
|
|
args.depth = strtol(arg + 8, NULL, 0);
|
|
continue;
|
|
}
|
|
if (!strcmp("--no-progress", arg)) {
|
|
args.no_progress = 1;
|
|
continue;
|
|
}
|
|
usage(fetch_pack_usage);
|
|
}
|
|
dest = (char *)arg;
|
|
heads = (char **)(argv + i + 1);
|
|
nr_heads = argc - i - 1;
|
|
break;
|
|
}
|
|
if (!dest)
|
|
usage(fetch_pack_usage);
|
|
|
|
conn = git_connect(fd, (char *)dest, args.uploadpack,
|
|
args.verbose ? CONNECT_VERBOSE : 0);
|
|
if (conn) {
|
|
get_remote_heads(fd[0], &ref, 0, NULL, 0);
|
|
|
|
ref = fetch_pack(&args, fd, conn, ref, dest, nr_heads, heads, NULL);
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
if (finish_connect(conn))
|
|
ref = NULL;
|
|
} else {
|
|
ref = NULL;
|
|
}
|
|
ret = !ref;
|
|
|
|
if (!ret && nr_heads) {
|
|
/* If the heads to pull were given, we should have
|
|
* consumed all of them by matching the remote.
|
|
* Otherwise, 'git fetch remote no-such-ref' would
|
|
* silently succeed without issuing an error.
|
|
*/
|
|
for (i = 0; i < nr_heads; i++)
|
|
if (heads[i] && heads[i][0]) {
|
|
error("no such remote ref %s", heads[i]);
|
|
ret = 1;
|
|
}
|
|
}
|
|
while (ref) {
|
|
printf("%s %s\n",
|
|
sha1_to_hex(ref->old_sha1), ref->name);
|
|
ref = ref->next;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct ref *fetch_pack(struct fetch_pack_args *my_args,
|
|
int fd[], struct child_process *conn,
|
|
const struct ref *ref,
|
|
const char *dest,
|
|
int nr_heads,
|
|
char **heads,
|
|
char **pack_lockfile)
|
|
{
|
|
struct stat st;
|
|
struct ref *ref_cpy;
|
|
|
|
fetch_pack_setup();
|
|
if (&args != my_args)
|
|
memcpy(&args, my_args, sizeof(args));
|
|
if (args.depth > 0) {
|
|
if (stat(git_path("shallow"), &st))
|
|
st.st_mtime = 0;
|
|
}
|
|
|
|
if (heads && nr_heads)
|
|
nr_heads = remove_duplicates(nr_heads, heads);
|
|
if (!ref) {
|
|
packet_flush(fd[1]);
|
|
die("no matching remote head");
|
|
}
|
|
ref_cpy = do_fetch_pack(fd, ref, nr_heads, heads, pack_lockfile);
|
|
|
|
if (args.depth > 0) {
|
|
struct cache_time mtime;
|
|
char *shallow = git_path("shallow");
|
|
int fd;
|
|
|
|
mtime.sec = st.st_mtime;
|
|
#ifdef USE_NSEC
|
|
mtime.usec = st.st_mtim.usec;
|
|
#endif
|
|
if (stat(shallow, &st)) {
|
|
if (mtime.sec)
|
|
die("shallow file was removed during fetch");
|
|
} else if (st.st_mtime != mtime.sec
|
|
#ifdef USE_NSEC
|
|
|| st.st_mtim.usec != mtime.usec
|
|
#endif
|
|
)
|
|
die("shallow file was changed during fetch");
|
|
|
|
fd = hold_lock_file_for_update(&lock, shallow,
|
|
LOCK_DIE_ON_ERROR);
|
|
if (!write_shallow_commits(fd, 0)) {
|
|
unlink(shallow);
|
|
rollback_lock_file(&lock);
|
|
} else {
|
|
commit_lock_file(&lock);
|
|
}
|
|
}
|
|
|
|
reprepare_packed_git();
|
|
return ref_cpy;
|
|
}
|