#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 "sha1-array.h" #include "oidset.h" #include "packfile.h" #include "object-store.h" #include "connected.h" #include "fetch-negotiator.h" #include "fsck.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 lock_file shallow_lock; static const char *alternate_shallow_file; static char *negotiation_algorithm; static struct strbuf fsck_msg_types = STRBUF_INIT; /* 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 int rev_list_insert_ref(struct fetch_negotiator *negotiator, const char *refname, const struct object_id *oid) { struct object *o = deref_tag(the_repository, parse_object(the_repository, oid), refname, 0); if (o && o->type == OBJ_COMMIT) negotiator->add_tip(negotiator, (struct commit *)o); 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, refname, 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)) { if (!get_oid_hex(arg, result_oid)) { arg += 40; len -= arg - reader->line; if (len < 1) return ACK; if (strstr(arg, "continue")) return ACK_continue; if (strstr(arg, "common")) return ACK_common; if (strstr(arg, "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, NULL, &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_ref(rev_list_insert_ref_oid, negotiator); return; } for (i = 0; i < negotiation_tips->nr; i++) rev_list_insert_ref(negotiator, NULL, &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); if (!args->no_dependents) { 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. * * Do this only if args->no_dependents is false (if it is true, * we cannot trust the object flags). */ if (!args->no_dependents && ((o = lookup_object(the_repository, remote->hash)) != 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) { struct strbuf expanded_filter_spec = STRBUF_INIT; expand_list_objects_filter_spec(&args->filter_options, &expanded_filter_spec); packet_buf_write(&req_buf, "filter %s", expanded_filter_spec.buf); strbuf_release(&expanded_filter_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.hash)) 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; } flushes = 0; retval = -1; if (args->no_dependents) goto done; 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: 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 object *o = parse_object(the_repository, oid); while (o && o->type == OBJ_TAG) { struct tag *t = (struct tag *) o; if (!t->tagged) break; /* broken repository */ o->flags |= COMPLETE; o = parse_object(the_repository, &t->tagged->oid); } if (o && o->type == OBJ_COMMIT) { struct commit *commit = (struct commit *)o; if (!(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 */ 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); for (ref = unmatched; ref; ref = next) { next = ref->next; free(ref); } *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. If args->no_dependents is false, also mark COMPLETE remote refs as * COMMON_REF (otherwise, we are not planning to participate in negotiation, and * thus do not need COMMON_REF marks). * * 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; for (ref = *refs; ref; ref = ref->next) { struct object *o; if (!has_object_file_with_flags(&ref->old_oid, OBJECT_INFO_QUICK)) 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; } } if (!args->deepen) { for_each_ref(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); } /* * Mark all complete remote refs as common refs. * Don't mark them common yet; the server has to be told so first. */ for (ref = *refs; ref; ref = ref->next) { struct object *o = deref_tag(the_repository, lookup_object(the_repository, ref->old_oid.hash), NULL, 0); if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE)) continue; negotiator->known_common(negotiator, (struct commit *)o); } 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->hash); 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 int get_pack(struct fetch_pack_args *args, int xd[2], char **pack_lockfile) { 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) { argv_array_push(&cmd.args, "--shallow-file"); argv_array_push(&cmd.args, alternate_shallow_file); } if (do_keep || args->from_promisor) { if (pack_lockfile) cmd.out = -1; cmd_name = "index-pack"; argv_array_push(&cmd.args, cmd_name); argv_array_push(&cmd.args, "--stdin"); if (!args->quiet && !args->no_progress) argv_array_push(&cmd.args, "-v"); if (args->use_thin_pack) argv_array_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"); argv_array_pushf(&cmd.args, "--keep=fetch-pack %"PRIuMAX " on %s", (uintmax_t)getpid(), hostname); } if (args->check_self_contained_and_connected) argv_array_push(&cmd.args, "--check-self-contained-and-connected"); if (args->from_promisor) argv_array_push(&cmd.args, "--promisor"); } else { cmd_name = "unpack-objects"; argv_array_push(&cmd.args, cmd_name); if (args->quiet || args->no_progress) argv_array_push(&cmd.args, "-q"); args->check_self_contained_and_connected = 0; } if (pass_header) argv_array_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) /* * We cannot use --strict in index-pack because it * checks both broken objects and links, but we only * want to check for broken objects. */ argv_array_push(&cmd.args, "--fsck-objects"); else argv_array_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_lockfile) { *pack_lockfile = 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")); 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, char **pack_lockfile) { struct ref *ref = copy_ref_list(orig_ref); struct object_id oid; const char *agent_feature; int agent_len; struct fetch_negotiator negotiator; fetch_negotiator_init(&negotiator, negotiation_algorithm); sort_ref_list(&ref, ref_compare_name); QSORT(sought, nr_sought, cmp_ref_by_name); if ((args->depth > 0 || is_repository_shallow(the_repository)) && !server_supports("shallow")) 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 multi_ack_detailed")); multi_ack = 2; if (server_supports("no-done")) { print_verbose(args, _("Server supports no-done")); if (args->stateless_rpc) no_done = 1; } } else if (server_supports("multi_ack")) { print_verbose(args, _("Server supports multi_ack")); multi_ack = 1; } if (server_supports("side-band-64k")) { print_verbose(args, _("Server supports side-band-64k")); use_sideband = 2; } else if (server_supports("side-band")) { print_verbose(args, _("Server supports side-band")); use_sideband = 1; } if (server_supports("allow-tip-sha1-in-want")) { print_verbose(args, _("Server supports 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 allow-reachable-sha1-in-want")); allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1; } if (!server_supports("thin-pack")) args->use_thin_pack = 0; if (!server_supports("no-progress")) args->no_progress = 0; if (!server_supports("include-tag")) args->include_tag = 0; if (server_supports("ofs-delta")) print_verbose(args, _("Server supports ofs-delta")); else prefer_ofs_delta = 0; if (server_supports("filter")) { server_supports_filtering = 1; print_verbose(args, _("Server supports filter")); } else if (args->filter_options.choice) { warning("filtering not recognized by server, ignoring"); } 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("deepen-since")) deepen_since_ok = 1; else if (args->deepen_since) die(_("Server does not support --shallow-since")); if (server_supports("deepen-not")) deepen_not_ok = 1; else if (args->deepen_not) die(_("Server does not support --shallow-exclude")); if (!server_supports("deepen-relative") && args->deepen_relative) die(_("Server does not support --deepen")); if (!args->no_dependents) { 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; } } else { filter_refs(args, &ref, sought, nr_sought); } 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_lockfile)) die(_("git fetch-pack: fetch failed.")); all_done: 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(int no_dependents, 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. * * Do this only if args->no_dependents is false (if it is true, * we cannot trust the object flags). */ if (!no_dependents && ((o = lookup_object(the_repository, remote->hash)) != 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, 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 || *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, const struct fetch_pack_args *args, const struct ref *wants, struct oidset *common, int *haves_to_send, int *in_vain, int sideband_all) { int ret = 0; 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_write_fmt(fd_out, "server-option=%s", args->server_options->items[i].string); } 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) { struct strbuf expanded_filter_spec = STRBUF_INIT; print_verbose(args, _("Server supports filter")); expand_list_objects_filter_spec(&args->filter_options, &expanded_filter_spec); packet_buf_write(&req_buf, "filter %s", expanded_filter_spec.buf); strbuf_release(&expanded_filter_spec); } else if (args->filter_options.choice) { warning("filtering not recognized by server, ignoring"); } /* add wants */ add_wants(args->no_dependents, wants, &req_buf); if (args->no_dependents) { packet_buf_write(&req_buf, "done"); ret = 1; } else { /* Add all of the common commits we've found in previous rounds */ add_common(&req_buf, common); /* Add initial haves */ ret = add_haves(negotiator, &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; } static int 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; if (!get_oid_hex(arg, &oid)) { struct commit *commit; oidset_insert(common, &oid); commit = lookup_commit(the_repository, &oid); 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 0 if no common, 1 if there are common, or 2 if ready */ return received_ready ? 2 : (received_ack ? 1 : 0); } static void receive_shallow_info(struct fetch_pack_args *args, struct packet_reader *reader) { int line_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); register_shallow(the_repository, &oid); line_received = 1; 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.hash)) 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); line_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 (line_received) { setup_alternate_shallow(&shallow_lock, &alternate_shallow_file, NULL); args->deepen = 1; } else { alternate_shallow_file = NULL; } } 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; int i; if (parse_oid_hex(reader->line, &oid, &end) || *end++ != ' ') die(_("expected wanted-ref, got '%s'"), reader->line); for (i = 0; i < nr_sought; i++) { if (!strcmp(end, sought[i]->name)) { oidcpy(&sought[i]->old_oid, &oid); break; } } if (i == nr_sought) die(_("unexpected wanted-ref: '%s'"), reader->line); } if (reader->status != PACKET_READ_DELIM) die(_("error processing wanted refs: %d"), reader->status); } enum fetch_state { FETCH_CHECK_LOCAL = 0, FETCH_SEND_REQUEST, FETCH_PROCESS_ACKS, FETCH_GET_PACK, FETCH_DONE, }; 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, char **pack_lockfile) { 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; int haves_to_send = INITIAL_FLUSH; struct fetch_negotiator negotiator; fetch_negotiator_init(&negotiator, negotiation_algorithm); 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 */ if (!args->no_dependents) { 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); } else { filter_refs(args, &ref, sought, nr_sought); state = FETCH_SEND_REQUEST; } break; case FETCH_SEND_REQUEST: if (send_fetch_request(&negotiator, fd[1], args, ref, &common, &haves_to_send, &in_vain, reader.use_sideband)) state = FETCH_GET_PACK; else state = FETCH_PROCESS_ACKS; break; case FETCH_PROCESS_ACKS: /* Process ACKs/NAKs */ switch (process_acks(&negotiator, &reader, &common)) { case 2: state = FETCH_GET_PACK; break; case 1: in_vain = 0; /* fallthrough */ default: state = FETCH_SEND_REQUEST; break; } break; case FETCH_GET_PACK: /* Check for shallow-info section */ if (process_section_header(&reader, "shallow-info", 1)) receive_shallow_info(args, &reader); if (process_section_header(&reader, "wanted-refs", 1)) receive_wanted_refs(&reader, sought, nr_sought); /* get the pack */ process_section_header(&reader, "packfile", 0); if (get_pack(args, fd, pack_lockfile)) die(_("git fetch-pack: fetch failed.")); state = FETCH_DONE; break; case FETCH_DONE: continue; } } 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); git_config_get_string("fetch.negotiationalgorithm", &negotiation_algorithm); 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_lock_file(&shallow_lock); } else commit_lock_file(&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_lock_file(&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_lock_file(&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[], struct child_process *conn, const struct ref *ref, const char *dest, struct ref **sought, int nr_sought, struct oid_array *shallow, char **pack_lockfile, enum protocol_version version) { struct ref *ref_cpy; struct shallow_info si; fetch_pack_setup(); if (nr_sought) nr_sought = remove_duplicates_in_refs(sought, nr_sought); if (args->no_dependents && !args->filter_options.choice) { /* * The protocol does not support requesting that only the * wanted objects be sent, so approximate this by setting a * "blob:none" filter if no filter is already set. This works * for all object types: note that wanted blobs will still be * sent because they are directly specified as a "want". * * NEEDSWORK: Add an option in the protocol to request that * only the wanted objects be sent, and implement it. */ parse_list_objects_filter(&args->filter_options, "blob:none"); } 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, pack_lockfile); } else { prepare_shallow_info(&si, shallow); ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought, &si, pack_lockfile); } 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_lock_file(&shallow_lock); goto cleanup; } args->connectivity_checked = 1; } update_shallow(args, sought, nr_sought, &si); cleanup: clear_shallow_info(&si); 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; }