#define USE_THE_REPOSITORY_VARIABLE

#define DISABLE_SIGN_COMPARE_WARNINGS

#include "git-compat-util.h"

#include "repository.h"

#include "config.h"

#include "date.h"

#include "environment.h"

#include "gettext.h"

#include "hex.h"

#include "lockfile.h"

#include "refs.h"

#include "pkt-line.h"

#include "commit.h"

#include "tag.h"

#include "pack.h"

#include "sideband.h"

#include "fetch-pack.h"

#include "remote.h"

#include "run-command.h"

#include "connect.h"

#include "trace2.h"

#include "version.h"

#include "oid-array.h"

#include "oidset.h"

#include "packfile.h"

#include "odb.h"

#include "path.h"

#include "connected.h"

#include "fetch-negotiator.h"

#include "fsck.h"

#include "shallow.h"

#include "commit-reach.h"

#include "commit-graph.h"

#include "sigchain.h"

#include "mergesort.h"

#include "prio-queue.h"

#include "promisor-remote.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 int advertise_sid;

static struct shallow_lock shallow_lock;

static const char *alternate_shallow_file;

static struct fsck_options fsck_options = FSCK_OPTIONS_MISSING_GITMODULES;

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)

#define COMMON    (1U << 6)

#define REACH_SCRATCH (1U << 7)

/*

 * 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) {

    odb_for_each_alternate_ref(the_repository->objects,

             cache_one_alternate, &cache);

    initialized = 1;

  }

  for (i = 0; i < cache.nr; i++)

    cb(negotiator, cache.items[i]);

}

static void die_in_commit_graph_only(const struct object_id *oid)

{

  die(_("You are attempting to fetch %s, which is in the commit graph file but not in the object database.\n"

        "This is probably due to repo corruption.\n"

        "If you are attempting to repair this repo corruption by refetching the missing object, use 'git fetch --refetch' with the missing object."),

        oid_to_hex(oid));

}

static struct commit *deref_without_lazy_fetch(const struct object_id *oid,

                 int mark_tags_complete_and_check_obj_db)

{

  enum object_type type;

  struct object_info info = { .typep = &type };

  struct commit *commit;

  commit = lookup_commit_in_graph(the_repository, oid);

  if (commit) {

    if (mark_tags_complete_and_check_obj_db) {

      if (!odb_has_object(the_repository->objects, oid,

              HAS_OBJECT_RECHECK_PACKED))

        die_in_commit_graph_only(oid);

    }

    return commit;

  }

  while (1) {

    if (odb_read_object_info_extended(the_repository->objects, 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_and_check_obj_db)

        tag->object.flags |= COMPLETE;

      oid = &tag->tagged->oid;

    } else {

      break;

    }

  }

  if (type == OBJ_COMMIT) {

    struct commit *commit = lookup_commit(the_repository, oid);

    if (!commit || repo_parse_commit(the_repository, commit))

      return NULL;

    return commit;

  }

  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 struct reference *ref, void *cb_data)

{

  return rev_list_insert_ref(cb_data, ref->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) {

    refs_for_each_rawref(get_main_ref_store(the_repository),

             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 void send_filter(struct fetch_pack_args *args,

      struct strbuf *req_buf,

      int server_supports_filter)

{

  if (args->filter_options.choice) {

    const char *spec =

      expand_list_objects_filter_spec(&args->filter_options);

    if (server_supports_filter) {

      print_verbose(args, _("Server supports filter"));

      packet_buf_write(req_buf, "filter %s", spec);

      trace2_data_string("fetch", the_repository,

             "filter/effective", spec);

    } else {

      warning("filtering not recognized by server, ignoring");

      trace2_data_string("fetch", the_repository,

             "filter/unsupported", spec);

    }

  } else {

    trace2_data_string("fetch", the_repository,

           "filter/none", "");

  }

}

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;

  int negotiation_round = 0, haves = 0;

  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(_("the option '%s' requires '%s'"), "--stateless-rpc", "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 (!args->refetch) {

      /*

      * 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 (advertise_sid)

        strbuf_addf(&c, " session-id=%s", trace2_session_id());

      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);

    }

  }

  send_filter(args, &req_buf, server_supports_filtering);

  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++;

    haves++;

    if (flush_at <= ++count) {

      int ack;

      negotiation_round++;

      trace2_region_enter_printf("negotiation_v0_v1", "round",

               the_repository, "%d",

               negotiation_round);

      trace2_data_intmax("negotiation_v0_v1", the_repository,

             "haves_added", haves);

      trace2_data_intmax("negotiation_v0_v1", the_repository,

             "in_vain", in_vain);

      haves = 0;

      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:

          trace2_region_leave_printf("negotiation_v0_v1", "round",

                   the_repository, "%d",

                   negotiation_round);

          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;

            haves++;

            /*

             * 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--;

      trace2_region_leave_printf("negotiation_v0_v1", "round",

               the_repository, "%d",

               negotiation_round);

      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);

  trace2_data_intmax("negotiation_v0_v1", the_repository, "total_rounds",

         negotiation_round);

  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 prio_queue complete = { compare_commits_by_commit_date };

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;

    prio_queue_put(&complete, commit);

  }

  return 0;

}

static int mark_complete_oid(const struct reference *ref, void *cb_data UNUSED)

{

  return mark_complete(ref->oid);

}

static void mark_recent_complete_commits(struct fetch_pack_args *args,

           timestamp_t cutoff)

{

  while (complete.nr) {

    struct commit *item = prio_queue_peek(&complete);

    if (item->date < cutoff)

      break;

    print_verbose(args, _("Marking %s as complete"),

            oid_to_hex(&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 *negotiator UNUSED,

            struct object *obj)

{

  mark_complete(&obj->oid);

}

/*

 * 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;

  if (args->refetch)

    return;

  save_commit_buffer = 0;

  trace2_region_enter("fetch-pack", "parse_remote_refs_and_find_cutoff", NULL);

  for (ref = *refs; ref; ref = ref->next) {

    struct commit *commit;

    commit = lookup_commit_in_graph(the_repository, &ref->old_oid);

    if (!commit) {

      struct object *o;

      if (!odb_has_object(the_repository->objects, &ref->old_oid, 0))

        continue;

      o = parse_object(the_repository, &ref->old_oid);

      if (!o || o->type != OBJ_COMMIT)

        continue;

      commit = (struct commit *)o;

    }

    /*

     * 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 (!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) {

    refs_for_each_rawref(get_main_ref_store(the_repository),

             mark_complete_oid, NULL);

    for_each_cached_alternate(NULL, mark_alternate_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 UNUSED, int out, void *data)

{

  int *xd = data;

  int ret;

  ret = recv_sideband("fetch-pack", xd[0], out);

  close(out);

  return ret;

}

static void create_promisor_file(const char *keep_name,

         struct ref **sought, int nr_sought)

{

  struct strbuf promisor_name = STRBUF_INIT;

  int suffix_stripped;

  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')",