diff options
Diffstat (limited to 'third_party/git/fetch-pack.c')
| -rw-r--r-- | third_party/git/fetch-pack.c | 1947 |
1 files changed, 0 insertions, 1947 deletions
diff --git a/third_party/git/fetch-pack.c b/third_party/git/fetch-pack.c deleted file mode 100644 index b10c4323155b..000000000000 --- a/third_party/git/fetch-pack.c +++ /dev/null @@ -1,1947 +0,0 @@ -#include "cache.h" -#include "repository.h" -#include "config.h" -#include "lockfile.h" -#include "refs.h" -#include "pkt-line.h" -#include "commit.h" -#include "tag.h" -#include "exec-cmd.h" -#include "pack.h" -#include "sideband.h" -#include "fetch-pack.h" -#include "remote.h" -#include "run-command.h" -#include "connect.h" -#include "transport.h" -#include "version.h" -#include "oid-array.h" -#include "oidset.h" -#include "packfile.h" -#include "object-store.h" -#include "connected.h" -#include "fetch-negotiator.h" -#include "fsck.h" -#include "shallow.h" - -static int transfer_unpack_limit = -1; -static int fetch_unpack_limit = -1; -static int unpack_limit = 100; -static int prefer_ofs_delta = 1; -static int no_done; -static int deepen_since_ok; -static int deepen_not_ok; -static int fetch_fsck_objects = -1; -static int transfer_fsck_objects = -1; -static int agent_supported; -static int server_supports_filtering; -static struct shallow_lock shallow_lock; -static const char *alternate_shallow_file; -static struct strbuf fsck_msg_types = STRBUF_INIT; -static struct string_list uri_protocols = STRING_LIST_INIT_DUP; - -/* Remember to update object flag allocation in object.h */ -#define COMPLETE (1U << 0) -#define ALTERNATE (1U << 1) - -/* - * After sending this many "have"s if we do not get any new ACK , we - * give up traversing our history. - */ -#define MAX_IN_VAIN 256 - -static int multi_ack, use_sideband; -/* Allow specifying sha1 if it is a ref tip. */ -#define ALLOW_TIP_SHA1 01 -/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */ -#define ALLOW_REACHABLE_SHA1 02 -static unsigned int allow_unadvertised_object_request; - -__attribute__((format (printf, 2, 3))) -static inline void print_verbose(const struct fetch_pack_args *args, - const char *fmt, ...) -{ - va_list params; - - if (!args->verbose) - return; - - va_start(params, fmt); - vfprintf(stderr, fmt, params); - va_end(params); - fputc('\n', stderr); -} - -struct alternate_object_cache { - struct object **items; - size_t nr, alloc; -}; - -static void cache_one_alternate(const struct object_id *oid, - void *vcache) -{ - struct alternate_object_cache *cache = vcache; - struct object *obj = parse_object(the_repository, oid); - - if (!obj || (obj->flags & ALTERNATE)) - return; - - obj->flags |= ALTERNATE; - ALLOC_GROW(cache->items, cache->nr + 1, cache->alloc); - cache->items[cache->nr++] = obj; -} - -static void for_each_cached_alternate(struct fetch_negotiator *negotiator, - void (*cb)(struct fetch_negotiator *, - struct object *)) -{ - static int initialized; - static struct alternate_object_cache cache; - size_t i; - - if (!initialized) { - for_each_alternate_ref(cache_one_alternate, &cache); - initialized = 1; - } - - for (i = 0; i < cache.nr; i++) - cb(negotiator, cache.items[i]); -} - -static struct commit *deref_without_lazy_fetch(const struct object_id *oid, - int mark_tags_complete) -{ - enum object_type type; - struct object_info info = { .typep = &type }; - - while (1) { - if (oid_object_info_extended(the_repository, oid, &info, - OBJECT_INFO_SKIP_FETCH_OBJECT | OBJECT_INFO_QUICK)) - return NULL; - if (type == OBJ_TAG) { - struct tag *tag = (struct tag *) - parse_object(the_repository, oid); - - if (!tag->tagged) - return NULL; - if (mark_tags_complete) - tag->object.flags |= COMPLETE; - oid = &tag->tagged->oid; - } else { - break; - } - } - if (type == OBJ_COMMIT) - return (struct commit *) parse_object(the_repository, oid); - return NULL; -} - -static int rev_list_insert_ref(struct fetch_negotiator *negotiator, - const struct object_id *oid) -{ - struct commit *c = deref_without_lazy_fetch(oid, 0); - - if (c) - negotiator->add_tip(negotiator, c); - return 0; -} - -static int rev_list_insert_ref_oid(const char *refname, const struct object_id *oid, - int flag, void *cb_data) -{ - return rev_list_insert_ref(cb_data, oid); -} - -enum ack_type { - NAK = 0, - ACK, - ACK_continue, - ACK_common, - ACK_ready -}; - -static void consume_shallow_list(struct fetch_pack_args *args, - struct packet_reader *reader) -{ - if (args->stateless_rpc && args->deepen) { - /* If we sent a depth we will get back "duplicate" - * shallow and unshallow commands every time there - * is a block of have lines exchanged. - */ - while (packet_reader_read(reader) == PACKET_READ_NORMAL) { - if (starts_with(reader->line, "shallow ")) - continue; - if (starts_with(reader->line, "unshallow ")) - continue; - die(_("git fetch-pack: expected shallow list")); - } - if (reader->status != PACKET_READ_FLUSH) - die(_("git fetch-pack: expected a flush packet after shallow list")); - } -} - -static enum ack_type get_ack(struct packet_reader *reader, - struct object_id *result_oid) -{ - int len; - const char *arg; - - if (packet_reader_read(reader) != PACKET_READ_NORMAL) - die(_("git fetch-pack: expected ACK/NAK, got a flush packet")); - len = reader->pktlen; - - if (!strcmp(reader->line, "NAK")) - return NAK; - if (skip_prefix(reader->line, "ACK ", &arg)) { - const char *p; - if (!parse_oid_hex(arg, result_oid, &p)) { - len -= p - reader->line; - if (len < 1) - return ACK; - if (strstr(p, "continue")) - return ACK_continue; - if (strstr(p, "common")) - return ACK_common; - if (strstr(p, "ready")) - return ACK_ready; - return ACK; - } - } - die(_("git fetch-pack: expected ACK/NAK, got '%s'"), reader->line); -} - -static void send_request(struct fetch_pack_args *args, - int fd, struct strbuf *buf) -{ - if (args->stateless_rpc) { - send_sideband(fd, -1, buf->buf, buf->len, LARGE_PACKET_MAX); - packet_flush(fd); - } else { - if (write_in_full(fd, buf->buf, buf->len) < 0) - die_errno(_("unable to write to remote")); - } -} - -static void insert_one_alternate_object(struct fetch_negotiator *negotiator, - struct object *obj) -{ - rev_list_insert_ref(negotiator, &obj->oid); -} - -#define INITIAL_FLUSH 16 -#define PIPESAFE_FLUSH 32 -#define LARGE_FLUSH 16384 - -static int next_flush(int stateless_rpc, int count) -{ - if (stateless_rpc) { - if (count < LARGE_FLUSH) - count <<= 1; - else - count = count * 11 / 10; - } else { - if (count < PIPESAFE_FLUSH) - count <<= 1; - else - count += PIPESAFE_FLUSH; - } - return count; -} - -static void mark_tips(struct fetch_negotiator *negotiator, - const struct oid_array *negotiation_tips) -{ - int i; - - if (!negotiation_tips) { - for_each_rawref(rev_list_insert_ref_oid, negotiator); - return; - } - - for (i = 0; i < negotiation_tips->nr; i++) - rev_list_insert_ref(negotiator, &negotiation_tips->oid[i]); - return; -} - -static int find_common(struct fetch_negotiator *negotiator, - struct fetch_pack_args *args, - int fd[2], struct object_id *result_oid, - struct ref *refs) -{ - int fetching; - int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval; - const struct object_id *oid; - unsigned in_vain = 0; - int got_continue = 0; - int got_ready = 0; - struct strbuf req_buf = STRBUF_INIT; - size_t state_len = 0; - struct packet_reader reader; - - if (args->stateless_rpc && multi_ack == 1) - die(_("--stateless-rpc requires multi_ack_detailed")); - - packet_reader_init(&reader, fd[0], NULL, 0, - PACKET_READ_CHOMP_NEWLINE | - PACKET_READ_DIE_ON_ERR_PACKET); - - mark_tips(negotiator, args->negotiation_tips); - for_each_cached_alternate(negotiator, insert_one_alternate_object); - - fetching = 0; - for ( ; refs ; refs = refs->next) { - struct object_id *remote = &refs->old_oid; - const char *remote_hex; - struct object *o; - - /* - * If that object is complete (i.e. it is an ancestor of a - * local ref), we tell them we have it but do not have to - * tell them about its ancestors, which they already know - * about. - * - * We use lookup_object here because we are only - * interested in the case we *know* the object is - * reachable and we have already scanned it. - */ - if (((o = lookup_object(the_repository, remote)) != NULL) && - (o->flags & COMPLETE)) { - continue; - } - - remote_hex = oid_to_hex(remote); - if (!fetching) { - struct strbuf c = STRBUF_INIT; - if (multi_ack == 2) strbuf_addstr(&c, " multi_ack_detailed"); - if (multi_ack == 1) strbuf_addstr(&c, " multi_ack"); - if (no_done) strbuf_addstr(&c, " no-done"); - if (use_sideband == 2) strbuf_addstr(&c, " side-band-64k"); - if (use_sideband == 1) strbuf_addstr(&c, " side-band"); - if (args->deepen_relative) strbuf_addstr(&c, " deepen-relative"); - if (args->use_thin_pack) strbuf_addstr(&c, " thin-pack"); - if (args->no_progress) strbuf_addstr(&c, " no-progress"); - if (args->include_tag) strbuf_addstr(&c, " include-tag"); - if (prefer_ofs_delta) strbuf_addstr(&c, " ofs-delta"); - if (deepen_since_ok) strbuf_addstr(&c, " deepen-since"); - if (deepen_not_ok) strbuf_addstr(&c, " deepen-not"); - if (agent_supported) strbuf_addf(&c, " agent=%s", - git_user_agent_sanitized()); - if (args->filter_options.choice) - strbuf_addstr(&c, " filter"); - packet_buf_write(&req_buf, "want %s%s\n", remote_hex, c.buf); - strbuf_release(&c); - } else - packet_buf_write(&req_buf, "want %s\n", remote_hex); - fetching++; - } - - if (!fetching) { - strbuf_release(&req_buf); - packet_flush(fd[1]); - return 1; - } - - if (is_repository_shallow(the_repository)) - write_shallow_commits(&req_buf, 1, NULL); - if (args->depth > 0) - packet_buf_write(&req_buf, "deepen %d", args->depth); - if (args->deepen_since) { - timestamp_t max_age = approxidate(args->deepen_since); - packet_buf_write(&req_buf, "deepen-since %"PRItime, max_age); - } - if (args->deepen_not) { - int i; - for (i = 0; i < args->deepen_not->nr; i++) { - struct string_list_item *s = args->deepen_not->items + i; - packet_buf_write(&req_buf, "deepen-not %s", s->string); - } - } - if (server_supports_filtering && args->filter_options.choice) { - const char *spec = - expand_list_objects_filter_spec(&args->filter_options); - packet_buf_write(&req_buf, "filter %s", spec); - } - packet_buf_flush(&req_buf); - state_len = req_buf.len; - - if (args->deepen) { - const char *arg; - struct object_id oid; - - send_request(args, fd[1], &req_buf); - while (packet_reader_read(&reader) == PACKET_READ_NORMAL) { - if (skip_prefix(reader.line, "shallow ", &arg)) { - if (get_oid_hex(arg, &oid)) - die(_("invalid shallow line: %s"), reader.line); - register_shallow(the_repository, &oid); - continue; - } - if (skip_prefix(reader.line, "unshallow ", &arg)) { - if (get_oid_hex(arg, &oid)) - die(_("invalid unshallow line: %s"), reader.line); - if (!lookup_object(the_repository, &oid)) - die(_("object not found: %s"), reader.line); - /* make sure that it is parsed as shallow */ - if (!parse_object(the_repository, &oid)) - die(_("error in object: %s"), reader.line); - if (unregister_shallow(&oid)) - die(_("no shallow found: %s"), reader.line); - continue; - } - die(_("expected shallow/unshallow, got %s"), reader.line); - } - } else if (!args->stateless_rpc) - send_request(args, fd[1], &req_buf); - - if (!args->stateless_rpc) { - /* If we aren't using the stateless-rpc interface - * we don't need to retain the headers. - */ - strbuf_setlen(&req_buf, 0); - state_len = 0; - } - - trace2_region_enter("fetch-pack", "negotiation_v0_v1", the_repository); - flushes = 0; - retval = -1; - while ((oid = negotiator->next(negotiator))) { - packet_buf_write(&req_buf, "have %s\n", oid_to_hex(oid)); - print_verbose(args, "have %s", oid_to_hex(oid)); - in_vain++; - if (flush_at <= ++count) { - int ack; - - packet_buf_flush(&req_buf); - send_request(args, fd[1], &req_buf); - strbuf_setlen(&req_buf, state_len); - flushes++; - flush_at = next_flush(args->stateless_rpc, count); - - /* - * We keep one window "ahead" of the other side, and - * will wait for an ACK only on the next one - */ - if (!args->stateless_rpc && count == INITIAL_FLUSH) - continue; - - consume_shallow_list(args, &reader); - do { - ack = get_ack(&reader, result_oid); - if (ack) - print_verbose(args, _("got %s %d %s"), "ack", - ack, oid_to_hex(result_oid)); - switch (ack) { - case ACK: - flushes = 0; - multi_ack = 0; - retval = 0; - goto done; - case ACK_common: - case ACK_ready: - case ACK_continue: { - struct commit *commit = - lookup_commit(the_repository, - result_oid); - int was_common; - - if (!commit) - die(_("invalid commit %s"), oid_to_hex(result_oid)); - was_common = negotiator->ack(negotiator, commit); - if (args->stateless_rpc - && ack == ACK_common - && !was_common) { - /* We need to replay the have for this object - * on the next RPC request so the peer knows - * it is in common with us. - */ - const char *hex = oid_to_hex(result_oid); - packet_buf_write(&req_buf, "have %s\n", hex); - state_len = req_buf.len; - /* - * Reset in_vain because an ack - * for this commit has not been - * seen. - */ - in_vain = 0; - } else if (!args->stateless_rpc - || ack != ACK_common) - in_vain = 0; - retval = 0; - got_continue = 1; - if (ack == ACK_ready) - got_ready = 1; - break; - } - } - } while (ack); - flushes--; - if (got_continue && MAX_IN_VAIN < in_vain) { - print_verbose(args, _("giving up")); - break; /* give up */ - } - if (got_ready) - break; - } - } -done: - trace2_region_leave("fetch-pack", "negotiation_v0_v1", the_repository); - if (!got_ready || !no_done) { - packet_buf_write(&req_buf, "done\n"); - send_request(args, fd[1], &req_buf); - } - print_verbose(args, _("done")); - if (retval != 0) { - multi_ack = 0; - flushes++; - } - strbuf_release(&req_buf); - - if (!got_ready || !no_done) - consume_shallow_list(args, &reader); - while (flushes || multi_ack) { - int ack = get_ack(&reader, result_oid); - if (ack) { - print_verbose(args, _("got %s (%d) %s"), "ack", - ack, oid_to_hex(result_oid)); - if (ack == ACK) - return 0; - multi_ack = 1; - continue; - } - flushes--; - } - /* it is no error to fetch into a completely empty repo */ - return count ? retval : 0; -} - -static struct commit_list *complete; - -static int mark_complete(const struct object_id *oid) -{ - struct commit *commit = deref_without_lazy_fetch(oid, 1); - - if (commit && !(commit->object.flags & COMPLETE)) { - commit->object.flags |= COMPLETE; - commit_list_insert(commit, &complete); - } - return 0; -} - -static int mark_complete_oid(const char *refname, const struct object_id *oid, - int flag, void *cb_data) -{ - return mark_complete(oid); -} - -static void mark_recent_complete_commits(struct fetch_pack_args *args, - timestamp_t cutoff) -{ - while (complete && cutoff <= complete->item->date) { - print_verbose(args, _("Marking %s as complete"), - oid_to_hex(&complete->item->object.oid)); - pop_most_recent_commit(&complete, COMPLETE); - } -} - -static void add_refs_to_oidset(struct oidset *oids, struct ref *refs) -{ - for (; refs; refs = refs->next) - oidset_insert(oids, &refs->old_oid); -} - -static int is_unmatched_ref(const struct ref *ref) -{ - struct object_id oid; - const char *p; - return ref->match_status == REF_NOT_MATCHED && - !parse_oid_hex(ref->name, &oid, &p) && - *p == '\0' && - oideq(&oid, &ref->old_oid); -} - -static void filter_refs(struct fetch_pack_args *args, - struct ref **refs, - struct ref **sought, int nr_sought) -{ - struct ref *newlist = NULL; - struct ref **newtail = &newlist; - struct ref *unmatched = NULL; - struct ref *ref, *next; - struct oidset tip_oids = OIDSET_INIT; - int i; - int strict = !(allow_unadvertised_object_request & - (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1)); - - i = 0; - for (ref = *refs; ref; ref = next) { - int keep = 0; - next = ref->next; - - if (starts_with(ref->name, "refs/") && - check_refname_format(ref->name, 0)) { - /* - * trash or a peeled value; do not even add it to - * unmatched list - */ - free_one_ref(ref); - continue; - } else { - while (i < nr_sought) { - int cmp = strcmp(ref->name, sought[i]->name); - if (cmp < 0) - break; /* definitely do not have it */ - else if (cmp == 0) { - keep = 1; /* definitely have it */ - sought[i]->match_status = REF_MATCHED; - } - i++; - } - - if (!keep && args->fetch_all && - (!args->deepen || !starts_with(ref->name, "refs/tags/"))) - keep = 1; - } - - if (keep) { - *newtail = ref; - ref->next = NULL; - newtail = &ref->next; - } else { - ref->next = unmatched; - unmatched = ref; - } - } - - if (strict) { - for (i = 0; i < nr_sought; i++) { - ref = sought[i]; - if (!is_unmatched_ref(ref)) - continue; - - add_refs_to_oidset(&tip_oids, unmatched); - add_refs_to_oidset(&tip_oids, newlist); - break; - } - } - - /* Append unmatched requests to the list */ - for (i = 0; i < nr_sought; i++) { - ref = sought[i]; - if (!is_unmatched_ref(ref)) - continue; - - if (!strict || oidset_contains(&tip_oids, &ref->old_oid)) { - ref->match_status = REF_MATCHED; - *newtail = copy_ref(ref); - newtail = &(*newtail)->next; - } else { - ref->match_status = REF_UNADVERTISED_NOT_ALLOWED; - } - } - - oidset_clear(&tip_oids); - free_refs(unmatched); - - *refs = newlist; -} - -static void mark_alternate_complete(struct fetch_negotiator *unused, - struct object *obj) -{ - mark_complete(&obj->oid); -} - -struct loose_object_iter { - struct oidset *loose_object_set; - struct ref *refs; -}; - -/* - * Mark recent commits available locally and reachable from a local ref as - * COMPLETE. - * - * The cutoff time for recency is determined by this heuristic: it is the - * earliest commit time of the objects in refs that are commits and that we know - * the commit time of. - */ -static void mark_complete_and_common_ref(struct fetch_negotiator *negotiator, - struct fetch_pack_args *args, - struct ref **refs) -{ - struct ref *ref; - int old_save_commit_buffer = save_commit_buffer; - timestamp_t cutoff = 0; - - save_commit_buffer = 0; - - trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL); - for (ref = *refs; ref; ref = ref->next) { - struct object *o; - - if (!has_object_file_with_flags(&ref->old_oid, - OBJECT_INFO_QUICK | - OBJECT_INFO_SKIP_FETCH_OBJECT)) - continue; - o = parse_object(the_repository, &ref->old_oid); - if (!o) - continue; - - /* - * We already have it -- which may mean that we were - * in sync with the other side at some time after - * that (it is OK if we guess wrong here). - */ - if (o->type == OBJ_COMMIT) { - struct commit *commit = (struct commit *)o; - if (!cutoff || cutoff < commit->date) - cutoff = commit->date; - } - } - trace2_region_leave("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL); - - /* - * This block marks all local refs as COMPLETE, and then recursively marks all - * parents of those refs as COMPLETE. - */ - trace2_region_enter("fetch-pack", "mark_complete_local_refs", NULL); - if (!args->deepen) { - for_each_rawref(mark_complete_oid, NULL); - for_each_cached_alternate(NULL, mark_alternate_complete); - commit_list_sort_by_date(&complete); - if (cutoff) - mark_recent_complete_commits(args, cutoff); - } - trace2_region_leave("fetch-pack", "mark_complete_local_refs", NULL); - - /* - * Mark all complete remote refs as common refs. - * Don't mark them common yet; the server has to be told so first. - */ - trace2_region_enter("fetch-pack", "mark_common_remote_refs", NULL); - for (ref = *refs; ref; ref = ref->next) { - struct commit *c = deref_without_lazy_fetch(&ref->old_oid, 0); - - if (!c || !(c->object.flags & COMPLETE)) - continue; - - negotiator->known_common(negotiator, c); - } - trace2_region_leave("fetch-pack", "mark_common_remote_refs", NULL); - - save_commit_buffer = old_save_commit_buffer; -} - -/* - * Returns 1 if every object pointed to by the given remote refs is available - * locally and reachable from a local ref, and 0 otherwise. - */ -static int everything_local(struct fetch_pack_args *args, - struct ref **refs) -{ - struct ref *ref; - int retval; - - for (retval = 1, ref = *refs; ref ; ref = ref->next) { - const struct object_id *remote = &ref->old_oid; - struct object *o; - - o = lookup_object(the_repository, remote); - if (!o || !(o->flags & COMPLETE)) { - retval = 0; - print_verbose(args, "want %s (%s)", oid_to_hex(remote), - ref->name); - continue; - } - print_verbose(args, _("already have %s (%s)"), oid_to_hex(remote), - ref->name); - } - - return retval; -} - -static int sideband_demux(int in, int out, void *data) -{ - int *xd = data; - int ret; - - ret = recv_sideband("fetch-pack", xd[0], out); - close(out); - return ret; -} - -static void write_promisor_file(const char *keep_name, - struct ref **sought, int nr_sought) -{ - struct strbuf promisor_name = STRBUF_INIT; - int suffix_stripped; - FILE *output; - int i; - - strbuf_addstr(&promisor_name, keep_name); - suffix_stripped = strbuf_strip_suffix(&promisor_name, ".keep"); - if (!suffix_stripped) - BUG("name of pack lockfile should end with .keep (was '%s')", - keep_name); - strbuf_addstr(&promisor_name, ".promisor"); - - output = xfopen(promisor_name.buf, "w"); - for (i = 0; i < nr_sought; i++) - fprintf(output, "%s %s\n", oid_to_hex(&sought[i]->old_oid), - sought[i]->name); - fclose(output); - - strbuf_release(&promisor_name); -} - -/* - * Pass 1 as "only_packfile" if the pack received is the only pack in this - * fetch request (that is, if there were no packfile URIs provided). - */ -static int get_pack(struct fetch_pack_args *args, - int xd[2], struct string_list *pack_lockfiles, - int only_packfile, - struct ref **sought, int nr_sought) -{ - struct async demux; - int do_keep = args->keep_pack; - const char *cmd_name; - struct pack_header header; - int pass_header = 0; - struct child_process cmd = CHILD_PROCESS_INIT; - int ret; - - memset(&demux, 0, sizeof(demux)); - if (use_sideband) { - /* xd[] is talking with upload-pack; subprocess reads from - * xd[0], spits out band#2 to stderr, and feeds us band#1 - * through demux->out. - */ - demux.proc = sideband_demux; - demux.data = xd; - demux.out = -1; - demux.isolate_sigpipe = 1; - if (start_async(&demux)) - die(_("fetch-pack: unable to fork off sideband demultiplexer")); - } - else - demux.out = xd[0]; - - if (!args->keep_pack && unpack_limit) { - - if (read_pack_header(demux.out, &header)) - die(_("protocol error: bad pack header")); - pass_header = 1; - if (ntohl(header.hdr_entries) < unpack_limit) - do_keep = 0; - else - do_keep = 1; - } - - if (alternate_shallow_file) { - strvec_push(&cmd.args, "--shallow-file"); - strvec_push(&cmd.args, alternate_shallow_file); - } - - if (do_keep || args->from_promisor) { - if (pack_lockfiles) - cmd.out = -1; - cmd_name = "index-pack"; - strvec_push(&cmd.args, cmd_name); - strvec_push(&cmd.args, "--stdin"); - if (!args->quiet && !args->no_progress) - strvec_push(&cmd.args, "-v"); - if (args->use_thin_pack) - strvec_push(&cmd.args, "--fix-thin"); - if (do_keep && (args->lock_pack || unpack_limit)) { - char hostname[HOST_NAME_MAX + 1]; - if (xgethostname(hostname, sizeof(hostname))) - xsnprintf(hostname, sizeof(hostname), "localhost"); - strvec_pushf(&cmd.args, - "--keep=fetch-pack %"PRIuMAX " on %s", - (uintmax_t)getpid(), hostname); - } - if (only_packfile && args->check_self_contained_and_connected) - strvec_push(&cmd.args, "--check-self-contained-and-connected"); - else - /* - * We cannot perform any connectivity checks because - * not all packs have been downloaded; let the caller - * have this responsibility. - */ - args->check_self_contained_and_connected = 0; - - if (args->from_promisor) - /* - * write_promisor_file() may be called afterwards but - * we still need index-pack to know that this is a - * promisor pack. For example, if transfer.fsckobjects - * is true, index-pack needs to know that .gitmodules - * is a promisor object (so that it won't complain if - * it is missing). - */ - strvec_push(&cmd.args, "--promisor"); - } - else { - cmd_name = "unpack-objects"; - strvec_push(&cmd.args, cmd_name); - if (args->quiet || args->no_progress) - strvec_push(&cmd.args, "-q"); - args->check_self_contained_and_connected = 0; - } - - if (pass_header) - strvec_pushf(&cmd.args, "--pack_header=%"PRIu32",%"PRIu32, - ntohl(header.hdr_version), - ntohl(header.hdr_entries)); - if (fetch_fsck_objects >= 0 - ? fetch_fsck_objects - : transfer_fsck_objects >= 0 - ? transfer_fsck_objects - : 0) { - if (args->from_promisor || !only_packfile) - /* - * We cannot use --strict in index-pack because it - * checks both broken objects and links, but we only - * want to check for broken objects. - */ - strvec_push(&cmd.args, "--fsck-objects"); - else - strvec_pushf(&cmd.args, "--strict%s", - fsck_msg_types.buf); - } - - cmd.in = demux.out; - cmd.git_cmd = 1; - if (start_command(&cmd)) - die(_("fetch-pack: unable to fork off %s"), cmd_name); - if (do_keep && pack_lockfiles) { - string_list_append_nodup(pack_lockfiles, - index_pack_lockfile(cmd.out)); - close(cmd.out); - } - - if (!use_sideband) - /* Closed by start_command() */ - xd[0] = -1; - - ret = finish_command(&cmd); - if (!ret || (args->check_self_contained_and_connected && ret == 1)) - args->self_contained_and_connected = - args->check_self_contained_and_connected && - ret == 0; - else - die(_("%s failed"), cmd_name); - if (use_sideband && finish_async(&demux)) - die(_("error in sideband demultiplexer")); - - /* - * Now that index-pack has succeeded, write the promisor file using the - * obtained .keep filename if necessary - */ - if (do_keep && pack_lockfiles && pack_lockfiles->nr && args->from_promisor) - write_promisor_file(pack_lockfiles->items[0].string, sought, nr_sought); - - return 0; -} - -static int cmp_ref_by_name(const void *a_, const void *b_) -{ - const struct ref *a = *((const struct ref **)a_); - const struct ref *b = *((const struct ref **)b_); - return strcmp(a->name, b->name); -} - -static struct ref *do_fetch_pack(struct fetch_pack_args *args, - int fd[2], - const struct ref *orig_ref, - struct ref **sought, int nr_sought, - struct shallow_info *si, - struct string_list *pack_lockfiles) -{ - struct repository *r = the_repository; - struct ref *ref = copy_ref_list(orig_ref); - struct object_id oid; - const char *agent_feature; - int agent_len; - struct fetch_negotiator negotiator_alloc; - struct fetch_negotiator *negotiator; - - negotiator = &negotiator_alloc; - fetch_negotiator_init(r, negotiator); - - sort_ref_list(&ref, ref_compare_name); - QSORT(sought, nr_sought, cmp_ref_by_name); - - if ((agent_feature = server_feature_value("agent", &agent_len))) { - agent_supported = 1; - if (agent_len) - print_verbose(args, _("Server version is %.*s"), - agent_len, agent_feature); - } - - if (server_supports("shallow")) - print_verbose(args, _("Server supports %s"), "shallow"); - else if (args->depth > 0 || is_repository_shallow(r)) - die(_("Server does not support shallow clients")); - if (args->depth > 0 || args->deepen_since || args->deepen_not) - args->deepen = 1; - if (server_supports("multi_ack_detailed")) { - print_verbose(args, _("Server supports %s"), "multi_ack_detailed"); - multi_ack = 2; - if (server_supports("no-done")) { - print_verbose(args, _("Server supports %s"), "no-done"); - if (args->stateless_rpc) - no_done = 1; - } - } - else if (server_supports("multi_ack")) { - print_verbose(args, _("Server supports %s"), "multi_ack"); - multi_ack = 1; - } - if (server_supports("side-band-64k")) { - print_verbose(args, _("Server supports %s"), "side-band-64k"); - use_sideband = 2; - } - else if (server_supports("side-band")) { - print_verbose(args, _("Server supports %s"), "side-band"); - use_sideband = 1; - } - if (server_supports("allow-tip-sha1-in-want")) { - print_verbose(args, _("Server supports %s"), "allow-tip-sha1-in-want"); - allow_unadvertised_object_request |= ALLOW_TIP_SHA1; - } - if (server_supports("allow-reachable-sha1-in-want")) { - print_verbose(args, _("Server supports %s"), "allow-reachable-sha1-in-want"); - allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1; - } - if (server_supports("thin-pack")) - print_verbose(args, _("Server supports %s"), "thin-pack"); - else - args->use_thin_pack = 0; - if (server_supports("no-progress")) - print_verbose(args, _("Server supports %s"), "no-progress"); - else - args->no_progress = 0; - if (server_supports("include-tag")) - print_verbose(args, _("Server supports %s"), "include-tag"); - else - args->include_tag = 0; - if (server_supports("ofs-delta")) - print_verbose(args, _("Server supports %s"), "ofs-delta"); - else - prefer_ofs_delta = 0; - - if (server_supports("filter")) { - server_supports_filtering = 1; - print_verbose(args, _("Server supports %s"), "filter"); - } else if (args->filter_options.choice) { - warning("filtering not recognized by server, ignoring"); - } - - if (server_supports("deepen-since")) { - print_verbose(args, _("Server supports %s"), "deepen-since"); - deepen_since_ok = 1; - } else if (args->deepen_since) - die(_("Server does not support --shallow-since")); - if (server_supports("deepen-not")) { - print_verbose(args, _("Server supports %s"), "deepen-not"); - deepen_not_ok = 1; - } else if (args->deepen_not) - die(_("Server does not support --shallow-exclude")); - if (server_supports("deepen-relative")) - print_verbose(args, _("Server supports %s"), "deepen-relative"); - else if (args->deepen_relative) - die(_("Server does not support --deepen")); - if (!server_supports_hash(the_hash_algo->name, NULL)) - die(_("Server does not support this repository's object format")); - - mark_complete_and_common_ref(negotiator, args, &ref); - filter_refs(args, &ref, sought, nr_sought); - if (everything_local(args, &ref)) { - packet_flush(fd[1]); - goto all_done; - } - if (find_common(negotiator, args, fd, &oid, ref) < 0) - if (!args->keep_pack) - /* When cloning, it is not unusual to have - * no common commit. - */ - warning(_("no common commits")); - - if (args->stateless_rpc) - packet_flush(fd[1]); - if (args->deepen) - setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, - NULL); - else if (si->nr_ours || si->nr_theirs) - alternate_shallow_file = setup_temporary_shallow(si->shallow); - else - alternate_shallow_file = NULL; - if (get_pack(args, fd, pack_lockfiles, 1, sought, nr_sought)) - die(_("git fetch-pack: fetch failed.")); - - all_done: - if (negotiator) - negotiator->release(negotiator); - return ref; -} - -static void add_shallow_requests(struct strbuf *req_buf, - const struct fetch_pack_args *args) -{ - if (is_repository_shallow(the_repository)) - write_shallow_commits(req_buf, 1, NULL); - if (args->depth > 0) - packet_buf_write(req_buf, "deepen %d", args->depth); - if (args->deepen_since) { - timestamp_t max_age = approxidate(args->deepen_since); - packet_buf_write(req_buf, "deepen-since %"PRItime, max_age); - } - if (args->deepen_not) { - int i; - for (i = 0; i < args->deepen_not->nr; i++) { - struct string_list_item *s = args->deepen_not->items + i; - packet_buf_write(req_buf, "deepen-not %s", s->string); - } - } - if (args->deepen_relative) - packet_buf_write(req_buf, "deepen-relative\n"); -} - -static void add_wants(const struct ref *wants, struct strbuf *req_buf) -{ - int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0); - - for ( ; wants ; wants = wants->next) { - const struct object_id *remote = &wants->old_oid; - struct object *o; - - /* - * If that object is complete (i.e. it is an ancestor of a - * local ref), we tell them we have it but do not have to - * tell them about its ancestors, which they already know - * about. - * - * We use lookup_object here because we are only - * interested in the case we *know* the object is - * reachable and we have already scanned it. - */ - if (((o = lookup_object(the_repository, remote)) != NULL) && - (o->flags & COMPLETE)) { - continue; - } - - if (!use_ref_in_want || wants->exact_oid) - packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote)); - else - packet_buf_write(req_buf, "want-ref %s\n", wants->name); - } -} - -static void add_common(struct strbuf *req_buf, struct oidset *common) -{ - struct oidset_iter iter; - const struct object_id *oid; - oidset_iter_init(common, &iter); - - while ((oid = oidset_iter_next(&iter))) { - packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid)); - } -} - -static int add_haves(struct fetch_negotiator *negotiator, - int seen_ack, - struct strbuf *req_buf, - int *haves_to_send, int *in_vain) -{ - int ret = 0; - int haves_added = 0; - const struct object_id *oid; - - while ((oid = negotiator->next(negotiator))) { - packet_buf_write(req_buf, "have %s\n", oid_to_hex(oid)); - if (++haves_added >= *haves_to_send) - break; - } - - *in_vain += haves_added; - if (!haves_added || (seen_ack && *in_vain >= MAX_IN_VAIN)) { - /* Send Done */ - packet_buf_write(req_buf, "done\n"); - ret = 1; - } - - /* Increase haves to send on next round */ - *haves_to_send = next_flush(1, *haves_to_send); - - return ret; -} - -static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out, - struct fetch_pack_args *args, - const struct ref *wants, struct oidset *common, - int *haves_to_send, int *in_vain, - int sideband_all, int seen_ack) -{ - int ret = 0; - const char *hash_name; - struct strbuf req_buf = STRBUF_INIT; - - if (server_supports_v2("fetch", 1)) - packet_buf_write(&req_buf, "command=fetch"); - if (server_supports_v2("agent", 0)) - packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized()); - if (args->server_options && args->server_options->nr && - server_supports_v2("server-option", 1)) { - int i; - for (i = 0; i < args->server_options->nr; i++) - packet_buf_write(&req_buf, "server-option=%s", - args->server_options->items[i].string); - } - - if (server_feature_v2("object-format", &hash_name)) { - int hash_algo = hash_algo_by_name(hash_name); - if (hash_algo_by_ptr(the_hash_algo) != hash_algo) - die(_("mismatched algorithms: client %s; server %s"), - the_hash_algo->name, hash_name); - packet_write_fmt(fd_out, "object-format=%s", the_hash_algo->name); - } else if (hash_algo_by_ptr(the_hash_algo) != GIT_HASH_SHA1) { - die(_("the server does not support algorithm '%s'"), - the_hash_algo->name); - } - - packet_buf_delim(&req_buf); - if (args->use_thin_pack) - packet_buf_write(&req_buf, "thin-pack"); - if (args->no_progress) - packet_buf_write(&req_buf, "no-progress"); - if (args->include_tag) - packet_buf_write(&req_buf, "include-tag"); - if (prefer_ofs_delta) - packet_buf_write(&req_buf, "ofs-delta"); - if (sideband_all) - packet_buf_write(&req_buf, "sideband-all"); - - /* Add shallow-info and deepen request */ - if (server_supports_feature("fetch", "shallow", 0)) - add_shallow_requests(&req_buf, args); - else if (is_repository_shallow(the_repository) || args->deepen) - die(_("Server does not support shallow requests")); - - /* Add filter */ - if (server_supports_feature("fetch", "filter", 0) && - args->filter_options.choice) { - const char *spec = - expand_list_objects_filter_spec(&args->filter_options); - print_verbose(args, _("Server supports filter")); - packet_buf_write(&req_buf, "filter %s", spec); - } else if (args->filter_options.choice) { - warning("filtering not recognized by server, ignoring"); - } - - if (server_supports_feature("fetch", "packfile-uris", 0)) { - int i; - struct strbuf to_send = STRBUF_INIT; - - for (i = 0; i < uri_protocols.nr; i++) { - const char *s = uri_protocols.items[i].string; - - if (!strcmp(s, "https") || !strcmp(s, "http")) { - if (to_send.len) - strbuf_addch(&to_send, ','); - strbuf_addstr(&to_send, s); - } - } - if (to_send.len) { - packet_buf_write(&req_buf, "packfile-uris %s", - to_send.buf); - strbuf_release(&to_send); - } - } - - /* add wants */ - add_wants(wants, &req_buf); - - /* Add all of the common commits we've found in previous rounds */ - add_common(&req_buf, common); - - /* Add initial haves */ - ret = add_haves(negotiator, seen_ack, &req_buf, - haves_to_send, in_vain); - - /* Send request */ - packet_buf_flush(&req_buf); - if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0) - die_errno(_("unable to write request to remote")); - - strbuf_release(&req_buf); - return ret; -} - -/* - * Processes a section header in a server's response and checks if it matches - * `section`. If the value of `peek` is 1, the header line will be peeked (and - * not consumed); if 0, the line will be consumed and the function will die if - * the section header doesn't match what was expected. - */ -static int process_section_header(struct packet_reader *reader, - const char *section, int peek) -{ - int ret; - - if (packet_reader_peek(reader) != PACKET_READ_NORMAL) - die(_("error reading section header '%s'"), section); - - ret = !strcmp(reader->line, section); - - if (!peek) { - if (!ret) - die(_("expected '%s', received '%s'"), - section, reader->line); - packet_reader_read(reader); - } - - return ret; -} - -enum common_found { - /* - * No commit was found to be possessed by both the client and the - * server, and "ready" was not received. - */ - NO_COMMON_FOUND, - - /* - * At least one commit was found to be possessed by both the client and - * the server, and "ready" was not received. - */ - COMMON_FOUND, - - /* - * "ready" was received, indicating that the server is ready to send - * the packfile without any further negotiation. - */ - READY -}; - -static enum common_found process_acks(struct fetch_negotiator *negotiator, - struct packet_reader *reader, - struct oidset *common) -{ - /* received */ - int received_ready = 0; - int received_ack = 0; - - process_section_header(reader, "acknowledgments", 0); - while (packet_reader_read(reader) == PACKET_READ_NORMAL) { - const char *arg; - - if (!strcmp(reader->line, "NAK")) - continue; - - if (skip_prefix(reader->line, "ACK ", &arg)) { - struct object_id oid; - received_ack = 1; - if (!get_oid_hex(arg, &oid)) { - struct commit *commit; - oidset_insert(common, &oid); - commit = lookup_commit(the_repository, &oid); - if (negotiator) - negotiator->ack(negotiator, commit); - } - continue; - } - - if (!strcmp(reader->line, "ready")) { - received_ready = 1; - continue; - } - - die(_("unexpected acknowledgment line: '%s'"), reader->line); - } - - if (reader->status != PACKET_READ_FLUSH && - reader->status != PACKET_READ_DELIM) - die(_("error processing acks: %d"), reader->status); - - /* - * If an "acknowledgments" section is sent, a packfile is sent if and - * only if "ready" was sent in this section. The other sections - * ("shallow-info" and "wanted-refs") are sent only if a packfile is - * sent. Therefore, a DELIM is expected if "ready" is sent, and a FLUSH - * otherwise. - */ - if (received_ready && reader->status != PACKET_READ_DELIM) - die(_("expected packfile to be sent after 'ready'")); - if (!received_ready && reader->status != PACKET_READ_FLUSH) - die(_("expected no other sections to be sent after no 'ready'")); - - return received_ready ? READY : - (received_ack ? COMMON_FOUND : NO_COMMON_FOUND); -} - -static void receive_shallow_info(struct fetch_pack_args *args, - struct packet_reader *reader, - struct oid_array *shallows, - struct shallow_info *si) -{ - int unshallow_received = 0; - - process_section_header(reader, "shallow-info", 0); - while (packet_reader_read(reader) == PACKET_READ_NORMAL) { - const char *arg; - struct object_id oid; - - if (skip_prefix(reader->line, "shallow ", &arg)) { - if (get_oid_hex(arg, &oid)) - die(_("invalid shallow line: %s"), reader->line); - oid_array_append(shallows, &oid); - continue; - } - if (skip_prefix(reader->line, "unshallow ", &arg)) { - if (get_oid_hex(arg, &oid)) - die(_("invalid unshallow line: %s"), reader->line); - if (!lookup_object(the_repository, &oid)) - die(_("object not found: %s"), reader->line); - /* make sure that it is parsed as shallow */ - if (!parse_object(the_repository, &oid)) - die(_("error in object: %s"), reader->line); - if (unregister_shallow(&oid)) - die(_("no shallow found: %s"), reader->line); - unshallow_received = 1; - continue; - } - die(_("expected shallow/unshallow, got %s"), reader->line); - } - - if (reader->status != PACKET_READ_FLUSH && - reader->status != PACKET_READ_DELIM) - die(_("error processing shallow info: %d"), reader->status); - - if (args->deepen || unshallow_received) { - /* - * Treat these as shallow lines caused by our depth settings. - * In v0, these lines cannot cause refs to be rejected; do the - * same. - */ - int i; - - for (i = 0; i < shallows->nr; i++) - register_shallow(the_repository, &shallows->oid[i]); - setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, - NULL); - args->deepen = 1; - } else if (shallows->nr) { - /* - * Treat these as shallow lines caused by the remote being - * shallow. In v0, remote refs that reach these objects are - * rejected (unless --update-shallow is set); do the same. - */ - prepare_shallow_info(si, shallows); - if (si->nr_ours || si->nr_theirs) - alternate_shallow_file = - setup_temporary_shallow(si->shallow); - else - alternate_shallow_file = NULL; - } else { - alternate_shallow_file = NULL; - } -} - -static int cmp_name_ref(const void *name, const void *ref) -{ - return strcmp(name, (*(struct ref **)ref)->name); -} - -static void receive_wanted_refs(struct packet_reader *reader, - struct ref **sought, int nr_sought) -{ - process_section_header(reader, "wanted-refs", 0); - while (packet_reader_read(reader) == PACKET_READ_NORMAL) { - struct object_id oid; - const char *end; - struct ref **found; - - if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ') - die(_("expected wanted-ref, got '%s'"), reader->line); - - found = bsearch(end, sought, nr_sought, sizeof(*sought), - cmp_name_ref); - if (!found) - die(_("unexpected wanted-ref: '%s'"), reader->line); - oidcpy(&(*found)->old_oid, &oid); - } - - if (reader->status != PACKET_READ_DELIM) - die(_("error processing wanted refs: %d"), reader->status); -} - -static void receive_packfile_uris(struct packet_reader *reader, - struct string_list *uris) -{ - process_section_header(reader, "packfile-uris", 0); - while (packet_reader_read(reader) == PACKET_READ_NORMAL) { - if (reader->pktlen < the_hash_algo->hexsz || - reader->line[the_hash_algo->hexsz] != ' ') - die("expected '<hash> <uri>', got: %s\n", reader->line); - - string_list_append(uris, reader->line); - } - if (reader->status != PACKET_READ_DELIM) - die("expected DELIM"); -} - -enum fetch_state { - FETCH_CHECK_LOCAL = 0, - FETCH_SEND_REQUEST, - FETCH_PROCESS_ACKS, - FETCH_GET_PACK, - FETCH_DONE, -}; - -static void do_check_stateless_delimiter(const struct fetch_pack_args *args, - struct packet_reader *reader) -{ - check_stateless_delimiter(args->stateless_rpc, reader, - _("git fetch-pack: expected response end packet")); -} - -static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, - int fd[2], - const struct ref *orig_ref, - struct ref **sought, int nr_sought, - struct oid_array *shallows, - struct shallow_info *si, - struct string_list *pack_lockfiles) -{ - struct repository *r = the_repository; - struct ref *ref = copy_ref_list(orig_ref); - enum fetch_state state = FETCH_CHECK_LOCAL; - struct oidset common = OIDSET_INIT; - struct packet_reader reader; - int in_vain = 0, negotiation_started = 0; - int haves_to_send = INITIAL_FLUSH; - struct fetch_negotiator negotiator_alloc; - struct fetch_negotiator *negotiator; - int seen_ack = 0; - struct string_list packfile_uris = STRING_LIST_INIT_DUP; - int i; - - negotiator = &negotiator_alloc; - fetch_negotiator_init(r, negotiator); - - packet_reader_init(&reader, fd[0], NULL, 0, - PACKET_READ_CHOMP_NEWLINE | - PACKET_READ_DIE_ON_ERR_PACKET); - if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) && - server_supports_feature("fetch", "sideband-all", 0)) { - reader.use_sideband = 1; - reader.me = "fetch-pack"; - } - - while (state != FETCH_DONE) { - switch (state) { - case FETCH_CHECK_LOCAL: - sort_ref_list(&ref, ref_compare_name); - QSORT(sought, nr_sought, cmp_ref_by_name); - - /* v2 supports these by default */ - allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1; - use_sideband = 2; - if (args->depth > 0 || args->deepen_since || args->deepen_not) - args->deepen = 1; - - /* Filter 'ref' by 'sought' and those that aren't local */ - mark_complete_and_common_ref(negotiator, args, &ref); - filter_refs(args, &ref, sought, nr_sought); - if (everything_local(args, &ref)) - state = FETCH_DONE; - else - state = FETCH_SEND_REQUEST; - - mark_tips(negotiator, args->negotiation_tips); - for_each_cached_alternate(negotiator, - insert_one_alternate_object); - break; - case FETCH_SEND_REQUEST: - if (!negotiation_started) { - negotiation_started = 1; - trace2_region_enter("fetch-pack", - "negotiation_v2", - the_repository); - } - if (send_fetch_request(negotiator, fd[1], args, ref, - &common, - &haves_to_send, &in_vain, - reader.use_sideband, - seen_ack)) - state = FETCH_GET_PACK; - else - state = FETCH_PROCESS_ACKS; - break; - case FETCH_PROCESS_ACKS: - /* Process ACKs/NAKs */ - switch (process_acks(negotiator, &reader, &common)) { - case READY: - /* - * Don't check for response delimiter; get_pack() will - * read the rest of this response. - */ - state = FETCH_GET_PACK; - break; - case COMMON_FOUND: - in_vain = 0; - seen_ack = 1; - /* fallthrough */ - case NO_COMMON_FOUND: - do_check_stateless_delimiter(args, &reader); - state = FETCH_SEND_REQUEST; - break; - } - break; - case FETCH_GET_PACK: - trace2_region_leave("fetch-pack", - "negotiation_v2", - the_repository); - /* Check for shallow-info section */ - if (process_section_header(&reader, "shallow-info", 1)) - receive_shallow_info(args, &reader, shallows, si); - - if (process_section_header(&reader, "wanted-refs", 1)) - receive_wanted_refs(&reader, sought, nr_sought); - - /* get the pack(s) */ - if (process_section_header(&reader, "packfile-uris", 1)) - receive_packfile_uris(&reader, &packfile_uris); - process_section_header(&reader, "packfile", 0); - if (get_pack(args, fd, pack_lockfiles, - !packfile_uris.nr, sought, nr_sought)) - die(_("git fetch-pack: fetch failed.")); - do_check_stateless_delimiter(args, &reader); - - state = FETCH_DONE; - break; - case FETCH_DONE: - continue; - } - } - - for (i = 0; i < packfile_uris.nr; i++) { - struct child_process cmd = CHILD_PROCESS_INIT; - char packname[GIT_MAX_HEXSZ + 1]; - const char *uri = packfile_uris.items[i].string + - the_hash_algo->hexsz + 1; - - strvec_push(&cmd.args, "http-fetch"); - strvec_pushf(&cmd.args, "--packfile=%.*s", - (int) the_hash_algo->hexsz, - packfile_uris.items[i].string); - strvec_push(&cmd.args, uri); - cmd.git_cmd = 1; - cmd.no_stdin = 1; - cmd.out = -1; - if (start_command(&cmd)) - die("fetch-pack: unable to spawn http-fetch"); - - if (read_in_full(cmd.out, packname, 5) < 0 || - memcmp(packname, "keep\t", 5)) - die("fetch-pack: expected keep then TAB at start of http-fetch output"); - - if (read_in_full(cmd.out, packname, - the_hash_algo->hexsz + 1) < 0 || - packname[the_hash_algo->hexsz] != '\n') - die("fetch-pack: expected hash then LF at end of http-fetch output"); - - packname[the_hash_algo->hexsz] = '\0'; - - close(cmd.out); - - if (finish_command(&cmd)) - die("fetch-pack: unable to finish http-fetch"); - - if (memcmp(packfile_uris.items[i].string, packname, - the_hash_algo->hexsz)) - die("fetch-pack: pack downloaded from %s does not match expected hash %.*s", - uri, (int) the_hash_algo->hexsz, - packfile_uris.items[i].string); - - string_list_append_nodup(pack_lockfiles, - xstrfmt("%s/pack/pack-%s.keep", - get_object_directory(), - packname)); - } - string_list_clear(&packfile_uris, 0); - - if (negotiator) - negotiator->release(negotiator); - - oidset_clear(&common); - return ref; -} - -static int fetch_pack_config_cb(const char *var, const char *value, void *cb) -{ - if (strcmp(var, "fetch.fsck.skiplist") == 0) { - const char *path; - - if (git_config_pathname(&path, var, value)) - return 1; - strbuf_addf(&fsck_msg_types, "%cskiplist=%s", - fsck_msg_types.len ? ',' : '=', path); - free((char *)path); - return 0; - } - - if (skip_prefix(var, "fetch.fsck.", &var)) { - if (is_valid_msg_type(var, value)) - strbuf_addf(&fsck_msg_types, "%c%s=%s", - fsck_msg_types.len ? ',' : '=', var, value); - else - warning("Skipping unknown msg id '%s'", var); - return 0; - } - - return git_default_config(var, value, cb); -} - -static void fetch_pack_config(void) -{ - git_config_get_int("fetch.unpacklimit", &fetch_unpack_limit); - git_config_get_int("transfer.unpacklimit", &transfer_unpack_limit); - git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta); - git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects); - git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects); - if (!uri_protocols.nr) { - char *str; - - if (!git_config_get_string("fetch.uriprotocols", &str) && str) { - string_list_split(&uri_protocols, str, ',', -1); - free(str); - } - } - - git_config(fetch_pack_config_cb, NULL); -} - -static void fetch_pack_setup(void) -{ - static int did_setup; - if (did_setup) - return; - fetch_pack_config(); - if (0 <= transfer_unpack_limit) - unpack_limit = transfer_unpack_limit; - else if (0 <= fetch_unpack_limit) - unpack_limit = fetch_unpack_limit; - did_setup = 1; -} - -static int remove_duplicates_in_refs(struct ref **ref, int nr) -{ - struct string_list names = STRING_LIST_INIT_NODUP; - int src, dst; - - for (src = dst = 0; src < nr; src++) { - struct string_list_item *item; - item = string_list_insert(&names, ref[src]->name); - if (item->util) - continue; /* already have it */ - item->util = ref[src]; - if (src != dst) - ref[dst] = ref[src]; - dst++; - } - for (src = dst; src < nr; src++) - ref[src] = NULL; - string_list_clear(&names, 0); - return dst; -} - -static void update_shallow(struct fetch_pack_args *args, - struct ref **sought, int nr_sought, - struct shallow_info *si) -{ - struct oid_array ref = OID_ARRAY_INIT; - int *status; - int i; - - if (args->deepen && alternate_shallow_file) { - if (*alternate_shallow_file == '\0') { /* --unshallow */ - unlink_or_warn(git_path_shallow(the_repository)); - rollback_shallow_file(the_repository, &shallow_lock); - } else - commit_shallow_file(the_repository, &shallow_lock); - alternate_shallow_file = NULL; - return; - } - - if (!si->shallow || !si->shallow->nr) - return; - - if (args->cloning) { - /* - * remote is shallow, but this is a clone, there are - * no objects in repo to worry about. Accept any - * shallow points that exist in the pack (iow in repo - * after get_pack() and reprepare_packed_git()) - */ - struct oid_array extra = OID_ARRAY_INIT; - struct object_id *oid = si->shallow->oid; - for (i = 0; i < si->shallow->nr; i++) - if (has_object_file(&oid[i])) - oid_array_append(&extra, &oid[i]); - if (extra.nr) { - setup_alternate_shallow(&shallow_lock, - &alternate_shallow_file, - &extra); - commit_shallow_file(the_repository, &shallow_lock); - alternate_shallow_file = NULL; - } - oid_array_clear(&extra); - return; - } - - if (!si->nr_ours && !si->nr_theirs) - return; - - remove_nonexistent_theirs_shallow(si); - if (!si->nr_ours && !si->nr_theirs) - return; - for (i = 0; i < nr_sought; i++) - oid_array_append(&ref, &sought[i]->old_oid); - si->ref = &ref; - - if (args->update_shallow) { - /* - * remote is also shallow, .git/shallow may be updated - * so all refs can be accepted. Make sure we only add - * shallow roots that are actually reachable from new - * refs. - */ - struct oid_array extra = OID_ARRAY_INIT; - struct object_id *oid = si->shallow->oid; - assign_shallow_commits_to_refs(si, NULL, NULL); - if (!si->nr_ours && !si->nr_theirs) { - oid_array_clear(&ref); - return; - } - for (i = 0; i < si->nr_ours; i++) - oid_array_append(&extra, &oid[si->ours[i]]); - for (i = 0; i < si->nr_theirs; i++) - oid_array_append(&extra, &oid[si->theirs[i]]); - setup_alternate_shallow(&shallow_lock, - &alternate_shallow_file, - &extra); - commit_shallow_file(the_repository, &shallow_lock); - oid_array_clear(&extra); - oid_array_clear(&ref); - alternate_shallow_file = NULL; - return; - } - - /* - * remote is also shallow, check what ref is safe to update - * without updating .git/shallow - */ - status = xcalloc(nr_sought, sizeof(*status)); - assign_shallow_commits_to_refs(si, NULL, status); - if (si->nr_ours || si->nr_theirs) { - for (i = 0; i < nr_sought; i++) - if (status[i]) - sought[i]->status = REF_STATUS_REJECT_SHALLOW; - } - free(status); - oid_array_clear(&ref); -} - -static int iterate_ref_map(void *cb_data, struct object_id *oid) -{ - struct ref **rm = cb_data; - struct ref *ref = *rm; - - if (!ref) - return -1; /* end of the list */ - *rm = ref->next; - oidcpy(oid, &ref->old_oid); - return 0; -} - -struct ref *fetch_pack(struct fetch_pack_args *args, - int fd[], - const struct ref *ref, - struct ref **sought, int nr_sought, - struct oid_array *shallow, - struct string_list *pack_lockfiles, - enum protocol_version version) -{ - struct ref *ref_cpy; - struct shallow_info si; - struct oid_array shallows_scratch = OID_ARRAY_INIT; - - fetch_pack_setup(); - if (nr_sought) - nr_sought = remove_duplicates_in_refs(sought, nr_sought); - - if (version != protocol_v2 && !ref) { - packet_flush(fd[1]); - die(_("no matching remote head")); - } - if (version == protocol_v2) { - if (shallow->nr) - BUG("Protocol V2 does not provide shallows at this point in the fetch"); - memset(&si, 0, sizeof(si)); - ref_cpy = do_fetch_pack_v2(args, fd, ref, sought, nr_sought, - &shallows_scratch, &si, - pack_lockfiles); - } else { - prepare_shallow_info(&si, shallow); - ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought, - &si, pack_lockfiles); - } - reprepare_packed_git(the_repository); - - if (!args->cloning && args->deepen) { - struct check_connected_options opt = CHECK_CONNECTED_INIT; - struct ref *iterator = ref_cpy; - opt.shallow_file = alternate_shallow_file; - if (args->deepen) - opt.is_deepening_fetch = 1; - if (check_connected(iterate_ref_map, &iterator, &opt)) { - error(_("remote did not send all necessary objects")); - free_refs(ref_cpy); - ref_cpy = NULL; - rollback_shallow_file(the_repository, &shallow_lock); - goto cleanup; - } - args->connectivity_checked = 1; - } - - update_shallow(args, sought, nr_sought, &si); -cleanup: - clear_shallow_info(&si); - oid_array_clear(&shallows_scratch); - return ref_cpy; -} - -int report_unmatched_refs(struct ref **sought, int nr_sought) -{ - int i, ret = 0; - - for (i = 0; i < nr_sought; i++) { - if (!sought[i]) - continue; - switch (sought[i]->match_status) { - case REF_MATCHED: - continue; - case REF_NOT_MATCHED: - error(_("no such remote ref %s"), sought[i]->name); - break; - case REF_UNADVERTISED_NOT_ALLOWED: - error(_("Server does not allow request for unadvertised object %s"), - sought[i]->name); - break; - } - ret = 1; - } - return ret; -} |