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-rw-r--r--fetch-pack.c1157
1 files changed, 1157 insertions, 0 deletions
diff --git a/fetch-pack.c b/fetch-pack.c
new file mode 100644
index 0000000000..d07d85ce30
--- /dev/null
+++ b/fetch-pack.c
@@ -0,0 +1,1157 @@
+#include "cache.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 "prio-queue.h"
+#include "sha1-array.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 struct lock_file shallow_lock;
+static const char *alternate_shallow_file;
+
+/* Remember to update object flag allocation in object.h */
+#define COMPLETE (1U << 0)
+#define COMMON (1U << 1)
+#define COMMON_REF (1U << 2)
+#define SEEN (1U << 3)
+#define POPPED (1U << 4)
+#define ALTERNATE (1U << 5)
+
+static int marked;
+
+/*
+ * 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 struct prio_queue rev_list = { compare_commits_by_commit_date };
+static int non_common_revs, 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 char *refname,
+ const struct object_id *oid,
+ void *vcache)
+{
+ struct alternate_object_cache *cache = vcache;
+ struct object *obj = parse_object(oid->hash);
+
+ 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(void (*cb)(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(cache.items[i]);
+}
+
+static void rev_list_push(struct commit *commit, int mark)
+{
+ if (!(commit->object.flags & mark)) {
+ commit->object.flags |= mark;
+
+ if (parse_commit(commit))
+ return;
+
+ prio_queue_put(&rev_list, commit);
+
+ if (!(commit->object.flags & COMMON))
+ non_common_revs++;
+ }
+}
+
+static int rev_list_insert_ref(const char *refname, const unsigned char *sha1)
+{
+ struct object *o = deref_tag(parse_object(sha1), refname, 0);
+
+ if (o && o->type == OBJ_COMMIT)
+ rev_list_push((struct commit *)o, SEEN);
+
+ 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(refname, oid->hash);
+}
+
+static int clear_marks(const char *refname, const struct object_id *oid,
+ int flag, void *cb_data)
+{
+ struct object *o = deref_tag(parse_object(oid->hash), refname, 0);
+
+ if (o && o->type == OBJ_COMMIT)
+ clear_commit_marks((struct commit *)o,
+ COMMON | COMMON_REF | SEEN | POPPED);
+ return 0;
+}
+
+/*
+ This function marks a rev and its ancestors as common.
+ In some cases, it is desirable to mark only the ancestors (for example
+ when only the server does not yet know that they are common).
+*/
+
+static void mark_common(struct commit *commit,
+ int ancestors_only, int dont_parse)
+{
+ if (commit != NULL && !(commit->object.flags & COMMON)) {
+ struct object *o = (struct object *)commit;
+
+ if (!ancestors_only)
+ o->flags |= COMMON;
+
+ if (!(o->flags & SEEN))
+ rev_list_push(commit, SEEN);
+ else {
+ struct commit_list *parents;
+
+ if (!ancestors_only && !(o->flags & POPPED))
+ non_common_revs--;
+ if (!o->parsed && !dont_parse)
+ if (parse_commit(commit))
+ return;
+
+ for (parents = commit->parents;
+ parents;
+ parents = parents->next)
+ mark_common(parents->item, 0, dont_parse);
+ }
+ }
+}
+
+/*
+ Get the next rev to send, ignoring the common.
+*/
+
+static const unsigned char *get_rev(void)
+{
+ struct commit *commit = NULL;
+
+ while (commit == NULL) {
+ unsigned int mark;
+ struct commit_list *parents;
+
+ if (rev_list.nr == 0 || non_common_revs == 0)
+ return NULL;
+
+ commit = prio_queue_get(&rev_list);
+ parse_commit(commit);
+ parents = commit->parents;
+
+ commit->object.flags |= POPPED;
+ if (!(commit->object.flags & COMMON))
+ non_common_revs--;
+
+ if (commit->object.flags & COMMON) {
+ /* do not send "have", and ignore ancestors */
+ commit = NULL;
+ mark = COMMON | SEEN;
+ } else if (commit->object.flags & COMMON_REF)
+ /* send "have", and ignore ancestors */
+ mark = COMMON | SEEN;
+ else
+ /* send "have", also for its ancestors */
+ mark = SEEN;
+
+ while (parents) {
+ if (!(parents->item->object.flags & SEEN))
+ rev_list_push(parents->item, mark);
+ if (mark & COMMON)
+ mark_common(parents->item, 1, 0);
+ parents = parents->next;
+ }
+ }
+
+ return commit->object.oid.hash;
+}
+
+enum ack_type {
+ NAK = 0,
+ ACK,
+ ACK_continue,
+ ACK_common,
+ ACK_ready
+};
+
+static void consume_shallow_list(struct fetch_pack_args *args, int fd)
+{
+ 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.
+ */
+ char *line;
+ while ((line = packet_read_line(fd, NULL))) {
+ if (starts_with(line, "shallow "))
+ continue;
+ if (starts_with(line, "unshallow "))
+ continue;
+ die(_("git fetch-pack: expected shallow list"));
+ }
+ }
+}
+
+static enum ack_type get_ack(int fd, unsigned char *result_sha1)
+{
+ int len;
+ char *line = packet_read_line(fd, &len);
+ const char *arg;
+
+ if (!len)
+ die(_("git fetch-pack: expected ACK/NAK, got EOF"));
+ if (!strcmp(line, "NAK"))
+ return NAK;
+ if (skip_prefix(line, "ACK ", &arg)) {
+ if (!get_sha1_hex(arg, result_sha1)) {
+ arg += 40;
+ len -= arg - 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'"), 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
+ write_or_die(fd, buf->buf, buf->len);
+}
+
+static void insert_one_alternate_object(struct object *obj)
+{
+ rev_list_insert_ref(NULL, obj->oid.hash);
+}
+
+#define INITIAL_FLUSH 16
+#define PIPESAFE_FLUSH 32
+#define LARGE_FLUSH 16384
+
+static int next_flush(struct fetch_pack_args *args, int count)
+{
+ if (args->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 int find_common(struct fetch_pack_args *args,
+ int fd[2], unsigned char *result_sha1,
+ struct ref *refs)
+{
+ int fetching;
+ int count = 0, flushes = 0, flush_at = INITIAL_FLUSH, retval;
+ const unsigned char *sha1;
+ unsigned in_vain = 0;
+ int got_continue = 0;
+ int got_ready = 0;
+ struct strbuf req_buf = STRBUF_INIT;
+ size_t state_len = 0;
+
+ if (args->stateless_rpc && multi_ack == 1)
+ die(_("--stateless-rpc requires multi_ack_detailed"));
+ if (marked)
+ for_each_ref(clear_marks, NULL);
+ marked = 1;
+
+ for_each_ref(rev_list_insert_ref_oid, NULL);
+ for_each_cached_alternate(insert_one_alternate_object);
+
+ fetching = 0;
+ for ( ; refs ; refs = refs->next) {
+ unsigned char *remote = refs->old_oid.hash;
+ 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(remote)) != NULL) &&
+ (o->flags & COMPLETE)) {
+ continue;
+ }
+
+ remote_hex = sha1_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());
+ 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())
+ write_shallow_commits(&req_buf, 1, NULL);
+ if (args->depth > 0)
+ packet_buf_write(&req_buf, "deepen %d", args->depth);
+ if (args->deepen_since) {
+ unsigned long max_age = approxidate(args->deepen_since);
+ packet_buf_write(&req_buf, "deepen-since %lu", 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);
+ }
+ }
+ packet_buf_flush(&req_buf);
+ state_len = req_buf.len;
+
+ if (args->deepen) {
+ char *line;
+ const char *arg;
+ unsigned char sha1[20];
+
+ send_request(args, fd[1], &req_buf);
+ while ((line = packet_read_line(fd[0], NULL))) {
+ if (skip_prefix(line, "shallow ", &arg)) {
+ if (get_sha1_hex(arg, sha1))
+ die(_("invalid shallow line: %s"), line);
+ register_shallow(sha1);
+ continue;
+ }
+ if (skip_prefix(line, "unshallow ", &arg)) {
+ if (get_sha1_hex(arg, sha1))
+ die(_("invalid unshallow line: %s"), line);
+ if (!lookup_object(sha1))
+ die(_("object not found: %s"), line);
+ /* make sure that it is parsed as shallow */
+ if (!parse_object(sha1))
+ die(_("error in object: %s"), line);
+ if (unregister_shallow(sha1))
+ die(_("no shallow found: %s"), line);
+ continue;
+ }
+ die(_("expected shallow/unshallow, got %s"), 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;
+ while ((sha1 = get_rev())) {
+ packet_buf_write(&req_buf, "have %s\n", sha1_to_hex(sha1));
+ print_verbose(args, "have %s", sha1_to_hex(sha1));
+ 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, 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, fd[0]);
+ do {
+ ack = get_ack(fd[0], result_sha1);
+ if (ack)
+ print_verbose(args, _("got %s %d %s"), "ack",
+ ack, sha1_to_hex(result_sha1));
+ 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(result_sha1);
+ if (!commit)
+ die(_("invalid commit %s"), sha1_to_hex(result_sha1));
+ if (args->stateless_rpc
+ && ack == ACK_common
+ && !(commit->object.flags & 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 = sha1_to_hex(result_sha1);
+ 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;
+ mark_common(commit, 0, 1);
+ retval = 0;
+ got_continue = 1;
+ if (ack == ACK_ready) {
+ clear_prio_queue(&rev_list);
+ got_ready = 1;
+ }
+ break;
+ }
+ }
+ } while (ack);
+ flushes--;
+ if (got_continue && MAX_IN_VAIN < in_vain) {
+ print_verbose(args, _("giving up"));
+ break; /* give up */
+ }
+ }
+ }
+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, fd[0]);
+ while (flushes || multi_ack) {
+ int ack = get_ack(fd[0], result_sha1);
+ if (ack) {
+ print_verbose(args, _("got %s (%d) %s"), "ack",
+ ack, sha1_to_hex(result_sha1));
+ 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 unsigned char *sha1)
+{
+ struct object *o = parse_object(sha1);
+
+ while (o && o->type == OBJ_TAG) {
+ struct tag *t = (struct tag *) o;
+ if (!t->tagged)
+ break; /* broken repository */
+ o->flags |= COMPLETE;
+ o = parse_object(t->tagged->oid.hash);
+ }
+ 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->hash);
+}
+
+static void mark_recent_complete_commits(struct fetch_pack_args *args,
+ unsigned long 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 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 *ref, *next;
+ int i;
+
+ 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 {
+ free(ref);
+ }
+ }
+
+ /* Append unmatched requests to the list */
+ for (i = 0; i < nr_sought; i++) {
+ unsigned char sha1[20];
+
+ ref = sought[i];
+ if (ref->match_status != REF_NOT_MATCHED)
+ continue;
+ if (get_sha1_hex(ref->name, sha1) ||
+ ref->name[40] != '\0' ||
+ hashcmp(sha1, ref->old_oid.hash))
+ continue;
+
+ if ((allow_unadvertised_object_request &
+ (ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1))) {
+ ref->match_status = REF_MATCHED;
+ *newtail = copy_ref(ref);
+ newtail = &(*newtail)->next;
+ } else {
+ ref->match_status = REF_UNADVERTISED_NOT_ALLOWED;
+ }
+ }
+ *refs = newlist;
+}
+
+static void mark_alternate_complete(struct object *obj)
+{
+ mark_complete(obj->oid.hash);
+}
+
+static int everything_local(struct fetch_pack_args *args,
+ struct ref **refs,
+ struct ref **sought, int nr_sought)
+{
+ struct ref *ref;
+ int retval;
+ unsigned long cutoff = 0;
+
+ save_commit_buffer = 0;
+
+ for (ref = *refs; ref; ref = ref->next) {
+ struct object *o;
+
+ if (!has_object_file(&ref->old_oid))
+ continue;
+
+ o = parse_object(ref->old_oid.hash);
+ 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(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(lookup_object(ref->old_oid.hash),
+ NULL, 0);
+
+ if (!o || o->type != OBJ_COMMIT || !(o->flags & COMPLETE))
+ continue;
+
+ if (!(o->flags & SEEN)) {
+ rev_list_push((struct commit *)o, COMMON_REF | SEEN);
+
+ mark_common((struct commit *)o, 1, 1);
+ }
+ }
+
+ filter_refs(args, refs, sought, nr_sought);
+
+ for (retval = 1, ref = *refs; ref ; ref = ref->next) {
+ const unsigned char *remote = ref->old_oid.hash;
+ struct object *o;
+
+ o = lookup_object(remote);
+ if (!o || !(o->flags & COMPLETE)) {
+ retval = 0;
+ print_verbose(args, "want %s (%s)", sha1_to_hex(remote),
+ ref->name);
+ continue;
+ }
+ print_verbose(args, _("already have %s (%s)"), sha1_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) {
+ 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 (args->lock_pack || unpack_limit) {
+ char hostname[256];
+ if (gethostname(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");
+ }
+ 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)
+ argv_array_push(&cmd.args, "--strict");
+
+ 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);
+ unsigned char sha1[20];
+ const char *agent_feature;
+ int agent_len;
+
+ sort_ref_list(&ref, ref_compare_name);
+ QSORT(sought, nr_sought, cmp_ref_by_name);
+
+ if ((args->depth > 0 || is_repository_shallow()) && !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 ((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 (everything_local(args, &ref, sought, nr_sought)) {
+ packet_flush(fd[1]);
+ goto all_done;
+ }
+ if (find_common(args, fd, sha1, 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:
+ return ref;
+}
+
+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(git_default_config, 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 sha1_array ref = SHA1_ARRAY_INIT;
+ int *status;
+ int i;
+
+ if (args->deepen && alternate_shallow_file) {
+ if (*alternate_shallow_file == '\0') { /* --unshallow */
+ unlink_or_warn(git_path_shallow());
+ rollback_lock_file(&shallow_lock);
+ } else
+ commit_lock_file(&shallow_lock);
+ 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 sha1_array extra = SHA1_ARRAY_INIT;
+ unsigned char (*sha1)[20] = si->shallow->sha1;
+ for (i = 0; i < si->shallow->nr; i++)
+ if (has_sha1_file(sha1[i]))
+ sha1_array_append(&extra, sha1[i]);
+ if (extra.nr) {
+ setup_alternate_shallow(&shallow_lock,
+ &alternate_shallow_file,
+ &extra);
+ commit_lock_file(&shallow_lock);
+ }
+ sha1_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++)
+ sha1_array_append(&ref, sought[i]->old_oid.hash);
+ 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 sha1_array extra = SHA1_ARRAY_INIT;
+ unsigned char (*sha1)[20] = si->shallow->sha1;
+ assign_shallow_commits_to_refs(si, NULL, NULL);
+ if (!si->nr_ours && !si->nr_theirs) {
+ sha1_array_clear(&ref);
+ return;
+ }
+ for (i = 0; i < si->nr_ours; i++)
+ sha1_array_append(&extra, sha1[si->ours[i]]);
+ for (i = 0; i < si->nr_theirs; i++)
+ sha1_array_append(&extra, sha1[si->theirs[i]]);
+ setup_alternate_shallow(&shallow_lock,
+ &alternate_shallow_file,
+ &extra);
+ commit_lock_file(&shallow_lock);
+ sha1_array_clear(&extra);
+ sha1_array_clear(&ref);
+ 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);
+ sha1_array_clear(&ref);
+}
+
+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 sha1_array *shallow,
+ char **pack_lockfile)
+{
+ struct ref *ref_cpy;
+ struct shallow_info si;
+
+ fetch_pack_setup();
+ if (nr_sought)
+ nr_sought = remove_duplicates_in_refs(sought, nr_sought);
+
+ if (!ref) {
+ packet_flush(fd[1]);
+ die(_("no matching remote head"));
+ }
+ prepare_shallow_info(&si, shallow);
+ ref_cpy = do_fetch_pack(args, fd, ref, sought, nr_sought,
+ &si, pack_lockfile);
+ reprepare_packed_git();
+ update_shallow(args, sought, nr_sought, &si);
+ 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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-20 00:23:26 +0000