/src/git/builtin/fetch.c

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/*
 * "git fetch"
 */
#include "builtin.h"
#include "advice.h"
#include "config.h"
#include "gettext.h"
#include "environment.h"
#include "hex.h"
#include "repository.h"
#include "refs.h"
#include "refspec.h"
#include "object-name.h"
#include "object-store-ll.h"
#include "oidset.h"
#include "oid-array.h"
#include "commit.h"
#include "string-list.h"
#include "remote.h"
#include "transport.h"
#include "run-command.h"
#include "parse-options.h"
#include "sigchain.h"
#include "submodule-config.h"
#include "submodule.h"
#include "connected.h"
#include "strvec.h"
#include "utf8.h"
#include "pager.h"
#include "path.h"
#include "pkt-line.h"
#include "list-objects-filter-options.h"
#include "commit-reach.h"
#include "branch.h"
#include "promisor-remote.h"
#include "commit-graph.h"
#include "shallow.h"
#include "trace.h"
#include "trace2.h"
#include "bundle-uri.h"

#define FORCED_UPDATES_DELAY_WARNING_IN_MS (10 * 1000)

static const char * const builtin_fetch_usage[] = {
  N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  N_("git fetch [<options>] <group>"),
  N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  N_("git fetch --all [<options>]"),
  NULL
};

enum {
  TAGS_UNSET = 0,
  TAGS_DEFAULT = 1,
  TAGS_SET = 2
};

enum display_format {
  DISPLAY_FORMAT_FULL,
  DISPLAY_FORMAT_COMPACT,
  DISPLAY_FORMAT_PORCELAIN,
};

struct display_state {
  struct strbuf buf;

  int refcol_width;
  enum display_format format;

  char *url;
  int url_len, shown_url;
};

static uint64_t forced_updates_ms = 0;
static int prefetch = 0;
static int prune = -1; /* unspecified */
#define PRUNE_BY_DEFAULT 0 /* do we prune by default? */

static int prune_tags = -1; /* unspecified */
#define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */

static int append, dry_run, force, keep, update_head_ok;
static int write_fetch_head = 1;
static int verbosity, deepen_relative, set_upstream, refetch;
static int progress = -1;
static int tags = TAGS_DEFAULT, update_shallow, deepen;
static int atomic_fetch;
static enum transport_family family;
static const char *depth;
static const char *deepen_since;
static const char *upload_pack;
static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
static struct strbuf default_rla = STRBUF_INIT;
static struct transport *gtransport;
static struct transport *gsecondary;
static struct refspec refmap = REFSPEC_INIT_FETCH;
static struct list_objects_filter_options filter_options = LIST_OBJECTS_FILTER_INIT;
static struct string_list server_options = STRING_LIST_INIT_DUP;
static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;

struct fetch_config {
  enum display_format display_format;
  int all;
  int prune;
  int prune_tags;
  int show_forced_updates;
  int recurse_submodules;
  int parallel;
  int submodule_fetch_jobs;
};

static int git_fetch_config(const char *k, const char *v,
          const struct config_context *ctx, void *cb)
{
  struct fetch_config *fetch_config = cb;

  if (!strcmp(k, "fetch.all")) {
    fetch_config->all = git_config_bool(k, v);
    return 0;
  }

  if (!strcmp(k, "fetch.prune")) {
    fetch_config->prune = git_config_bool(k, v);
    return 0;
  }

  if (!strcmp(k, "fetch.prunetags")) {
    fetch_config->prune_tags = git_config_bool(k, v);
    return 0;
  }

  if (!strcmp(k, "fetch.showforcedupdates")) {
    fetch_config->show_forced_updates = git_config_bool(k, v);
    return 0;
  }

  if (!strcmp(k, "submodule.recurse")) {
    int r = git_config_bool(k, v) ?
      RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
    fetch_config->recurse_submodules = r;
    return 0;
  }

  if (!strcmp(k, "submodule.fetchjobs")) {
    fetch_config->submodule_fetch_jobs = parse_submodule_fetchjobs(k, v, ctx->kvi);
    return 0;
  } else if (!strcmp(k, "fetch.recursesubmodules")) {
    fetch_config->recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
    return 0;
  }

  if (!strcmp(k, "fetch.parallel")) {
    fetch_config->parallel = git_config_int(k, v, ctx->kvi);
    if (fetch_config->parallel < 0)
      die(_("fetch.parallel cannot be negative"));
    if (!fetch_config->parallel)
      fetch_config->parallel = online_cpus();
    return 0;
  }

  if (!strcmp(k, "fetch.output")) {
    if (!v)
      return config_error_nonbool(k);
    else if (!strcasecmp(v, "full"))
      fetch_config->display_format = DISPLAY_FORMAT_FULL;
    else if (!strcasecmp(v, "compact"))
      fetch_config->display_format = DISPLAY_FORMAT_COMPACT;
    else
      die(_("invalid value for '%s': '%s'"),
          "fetch.output", v);
  }

  return git_default_config(k, v, ctx, cb);
}

static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
{
  BUG_ON_OPT_NEG(unset);

  /*
   * "git fetch --refmap='' origin foo"
   * can be used to tell the command not to store anywhere
   */
  refspec_append(opt->value, arg);

  return 0;
}

static void unlock_pack(unsigned int flags)
{
  if (gtransport)
    transport_unlock_pack(gtransport, flags);
  if (gsecondary)
    transport_unlock_pack(gsecondary, flags);
}

static void unlock_pack_atexit(void)
{
  unlock_pack(0);
}

static void unlock_pack_on_signal(int signo)
{
  unlock_pack(TRANSPORT_UNLOCK_PACK_IN_SIGNAL_HANDLER);
  sigchain_pop(signo);
  raise(signo);
}

static void add_merge_config(struct ref **head,
         const struct ref *remote_refs,
               struct branch *branch,
               struct ref ***tail)
{
  int i;

  for (i = 0; i < branch->merge_nr; i++) {
    struct ref *rm, **old_tail = *tail;
    struct refspec_item refspec;

    for (rm = *head; rm; rm = rm->next) {
      if (branch_merge_matches(branch, i, rm->name)) {
        rm->fetch_head_status = FETCH_HEAD_MERGE;
        break;
      }
    }
    if (rm)
      continue;

    /*
     * Not fetched to a remote-tracking branch?  We need to fetch
     * it anyway to allow this branch's "branch.$name.merge"
     * to be honored by 'git pull', but we do not have to
     * fail if branch.$name.merge is misconfigured to point
     * at a nonexisting branch.  If we were indeed called by
     * 'git pull', it will notice the misconfiguration because
     * there is no entry in the resulting FETCH_HEAD marked
     * for merging.
     */
    memset(&refspec, 0, sizeof(refspec));
    refspec.src = branch->merge[i]->src;
    get_fetch_map(remote_refs, &refspec, tail, 1);
    for (rm = *old_tail; rm; rm = rm->next)
      rm->fetch_head_status = FETCH_HEAD_MERGE;
  }
}

static void create_fetch_oidset(struct ref **head, struct oidset *out)
{
  struct ref *rm = *head;
  while (rm) {
    oidset_insert(out, &rm->old_oid);
    rm = rm->next;
  }
}

struct refname_hash_entry {
  struct hashmap_entry ent;
  struct object_id oid;
  int ignore;
  char refname[FLEX_ARRAY];
};

static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data UNUSED,
          const struct hashmap_entry *eptr,
          const struct hashmap_entry *entry_or_key,
          const void *keydata)
{
  const struct refname_hash_entry *e1, *e2;

  e1 = container_of(eptr, const struct refname_hash_entry, ent);
  e2 = container_of(entry_or_key, const struct refname_hash_entry, ent);
  return strcmp(e1->refname, keydata ? keydata : e2->refname);
}

static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
               const char *refname,
               const struct object_id *oid)
{
  struct refname_hash_entry *ent;
  size_t len = strlen(refname);

  FLEX_ALLOC_MEM(ent, refname, refname, len);
  hashmap_entry_init(&ent->ent, strhash(refname));
  oidcpy(&ent->oid, oid);
  hashmap_add(map, &ent->ent);
  return ent;
}

static int add_one_refname(const char *refname, const char *referent UNUSED,
         const struct object_id *oid,
         int flag UNUSED, void *cbdata)
{
  struct hashmap *refname_map = cbdata;

  (void) refname_hash_add(refname_map, refname, oid);
  return 0;
}

static void refname_hash_init(struct hashmap *map)
{
  hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
}

static int refname_hash_exists(struct hashmap *map, const char *refname)
{
  return !!hashmap_get_from_hash(map, strhash(refname), refname);
}

static void clear_item(struct refname_hash_entry *item)
{
  item->ignore = 1;
}


static void add_already_queued_tags(const char *refname,
            const struct object_id *old_oid UNUSED,
            const struct object_id *new_oid,
            void *cb_data)
{
  struct hashmap *queued_tags = cb_data;
  if (starts_with(refname, "refs/tags/") && new_oid)
    (void) refname_hash_add(queued_tags, refname, new_oid);
}

static void find_non_local_tags(const struct ref *refs,
        struct ref_transaction *transaction,
        struct ref **head,
        struct ref ***tail)
{
  struct hashmap existing_refs;
  struct hashmap remote_refs;
  struct oidset fetch_oids = OIDSET_INIT;
  struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
  struct string_list_item *remote_ref_item;
  const struct ref *ref;
  struct refname_hash_entry *item = NULL;
  const int quick_flags = OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT;

  refname_hash_init(&existing_refs);
  refname_hash_init(&remote_refs);
  create_fetch_oidset(head, &fetch_oids);

  refs_for_each_ref(get_main_ref_store(the_repository), add_one_refname,
        &existing_refs);

  /*
   * If we already have a transaction, then we need to filter out all
   * tags which have already been queued up.
   */
  if (transaction)
    ref_transaction_for_each_queued_update(transaction,
                   add_already_queued_tags,
                   &existing_refs);

  for (ref = refs; ref; ref = ref->next) {
    if (!starts_with(ref->name, "refs/tags/"))
      continue;

    /*
     * The peeled ref always follows the matching base
     * ref, so if we see a peeled ref that we don't want
     * to fetch then we can mark the ref entry in the list
     * as one to ignore by setting util to NULL.
     */
    if (ends_with(ref->name, "^{}")) {
      if (item &&
          !repo_has_object_file_with_flags(the_repository, &ref->old_oid, quick_flags) &&
          !oidset_contains(&fetch_oids, &ref->old_oid) &&
          !repo_has_object_file_with_flags(the_repository, &item->oid, quick_flags) &&
          !oidset_contains(&fetch_oids, &item->oid))
        clear_item(item);
      item = NULL;
      continue;
    }

    /*
     * If item is non-NULL here, then we previously saw a
     * ref not followed by a peeled reference, so we need
     * to check if it is a lightweight tag that we want to
     * fetch.
     */
    if (item &&
        !repo_has_object_file_with_flags(the_repository, &item->oid, quick_flags) &&
        !oidset_contains(&fetch_oids, &item->oid))
      clear_item(item);

    item = NULL;

    /* skip duplicates and refs that we already have */
    if (refname_hash_exists(&remote_refs, ref->name) ||
        refname_hash_exists(&existing_refs, ref->name))
      continue;

    item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
    string_list_insert(&remote_refs_list, ref->name);
  }
  hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);

  /*
   * We may have a final lightweight tag that needs to be
   * checked to see if it needs fetching.
   */
  if (item &&
      !repo_has_object_file_with_flags(the_repository, &item->oid, quick_flags) &&
      !oidset_contains(&fetch_oids, &item->oid))
    clear_item(item);

  /*
   * For all the tags in the remote_refs_list,
   * add them to the list of refs to be fetched
   */
  for_each_string_list_item(remote_ref_item, &remote_refs_list) {
    const char *refname = remote_ref_item->string;
    struct ref *rm;
    unsigned int hash = strhash(refname);

    item = hashmap_get_entry_from_hash(&remote_refs, hash, refname,
          struct refname_hash_entry, ent);
    if (!item)
      BUG("unseen remote ref?");

    /* Unless we have already decided to ignore this item... */
    if (item->ignore)
      continue;

    rm = alloc_ref(item->refname);
    rm->peer_ref = alloc_ref(item->refname);
    oidcpy(&rm->old_oid, &item->oid);
    **tail = rm;
    *tail = &rm->next;
  }
  hashmap_clear_and_free(&remote_refs, struct refname_hash_entry, ent);
  string_list_clear(&remote_refs_list, 0);
  oidset_clear(&fetch_oids);
}

static void filter_prefetch_refspec(struct refspec *rs)
{
  int i;

  if (!prefetch)
    return;

  for (i = 0; i < rs->nr; i++) {
    struct strbuf new_dst = STRBUF_INIT;
    char *old_dst;
    const char *sub = NULL;

    if (rs->items[i].negative)
      continue;
    if (!rs->items[i].dst ||
        (rs->items[i].src &&
         starts_with(rs->items[i].src,
         ref_namespace[NAMESPACE_TAGS].ref))) {
      int j;

      free(rs->items[i].src);
      free(rs->items[i].dst);

      for (j = i + 1; j < rs->nr; j++) {
        rs->items[j - 1] = rs->items[j];
        rs->raw[j - 1] = rs->raw[j];
      }
      rs->nr--;
      i--;
      continue;
    }

    old_dst = rs->items[i].dst;
    strbuf_addstr(&new_dst, ref_namespace[NAMESPACE_PREFETCH].ref);

    /*
     * If old_dst starts with "refs/", then place
     * sub after that prefix. Otherwise, start at
     * the beginning of the string.
     */
    if (!skip_prefix(old_dst, "refs/", &sub))
      sub = old_dst;
    strbuf_addstr(&new_dst, sub);

    rs->items[i].dst = strbuf_detach(&new_dst, NULL);
    rs->items[i].force = 1;

    free(old_dst);
  }
}

static struct ref *get_ref_map(struct remote *remote,
             const struct ref *remote_refs,
             struct refspec *rs,
             int tags, int *autotags)
{
  int i;
  struct ref *rm;
  struct ref *ref_map = NULL;
  struct ref **tail = &ref_map;

  /* opportunistically-updated references: */
  struct ref *orefs = NULL, **oref_tail = &orefs;

  struct hashmap existing_refs;
  int existing_refs_populated = 0;

  filter_prefetch_refspec(rs);
  if (remote)
    filter_prefetch_refspec(&remote->fetch);

  if (rs->nr) {
    struct refspec *fetch_refspec;

    for (i = 0; i < rs->nr; i++) {
      get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
      if (rs->items[i].dst && rs->items[i].dst[0])
        *autotags = 1;
    }
    /* Merge everything on the command line (but not --tags) */
    for (rm = ref_map; rm; rm = rm->next)
      rm->fetch_head_status = FETCH_HEAD_MERGE;

    /*
     * For any refs that we happen to be fetching via
     * command-line arguments, the destination ref might
     * have been missing or have been different than the
     * remote-tracking ref that would be derived from the
     * configured refspec.  In these cases, we want to
     * take the opportunity to update their configured
     * remote-tracking reference.  However, we do not want
     * to mention these entries in FETCH_HEAD at all, as
     * they would simply be duplicates of existing
     * entries, so we set them FETCH_HEAD_IGNORE below.
     *
     * We compute these entries now, based only on the
     * refspecs specified on the command line.  But we add
     * them to the list following the refspecs resulting
     * from the tags option so that one of the latter,
     * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
     * by ref_remove_duplicates() in favor of one of these
     * opportunistic entries with FETCH_HEAD_IGNORE.
     */
    if (refmap.nr)
      fetch_refspec = &refmap;
    else
      fetch_refspec = &remote->fetch;

    for (i = 0; i < fetch_refspec->nr; i++)
      get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
  } else if (refmap.nr) {
    die("--refmap option is only meaningful with command-line refspec(s)");
  } else {
    /* Use the defaults */
    struct branch *branch = branch_get(NULL);
    int has_merge = branch_has_merge_config(branch);
    if (remote &&
        (remote->fetch.nr ||
         /* Note: has_merge implies non-NULL branch->remote_name */
         (has_merge && !strcmp(branch->remote_name, remote->name)))) {
      for (i = 0; i < remote->fetch.nr; i++) {
        get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
        if (remote->fetch.items[i].dst &&
            remote->fetch.items[i].dst[0])
          *autotags = 1;
        if (!i && !has_merge && ref_map &&
            !remote->fetch.items[0].pattern)
          ref_map->fetch_head_status = FETCH_HEAD_MERGE;
      }
      /*
       * if the remote we're fetching from is the same
       * as given in branch.<name>.remote, we add the
       * ref given in branch.<name>.merge, too.
       *
       * Note: has_merge implies non-NULL branch->remote_name
       */
      if (has_merge &&
          !strcmp(branch->remote_name, remote->name))
        add_merge_config(&ref_map, remote_refs, branch, &tail);
    } else if (!prefetch) {
      ref_map = get_remote_ref(remote_refs, "HEAD");
      if (!ref_map)
        die(_("couldn't find remote ref HEAD"));
      ref_map->fetch_head_status = FETCH_HEAD_MERGE;
      tail = &ref_map->next;
    }
  }

  if (tags == TAGS_SET) {
    struct refspec_item tag_refspec;

    /* also fetch all tags */
    refspec_item_init(&tag_refspec, TAG_REFSPEC, 0);
    get_fetch_map(remote_refs, &tag_refspec, &tail, 0);
    refspec_item_clear(&tag_refspec);
  } else if (tags == TAGS_DEFAULT && *autotags) {
    find_non_local_tags(remote_refs, NULL, &ref_map, &tail);
  }

  /* Now append any refs to be updated opportunistically: */
  *tail = orefs;
  for (rm = orefs; rm; rm = rm->next) {
    rm->fetch_head_status = FETCH_HEAD_IGNORE;
    tail = &rm->next;
  }

  /*
   * apply negative refspecs first, before we remove duplicates. This is
   * necessary as negative refspecs might remove an otherwise conflicting
   * duplicate.
   */
  if (rs->nr)
    ref_map = apply_negative_refspecs(ref_map, rs);
  else
    ref_map = apply_negative_refspecs(ref_map, &remote->fetch);

  ref_map = ref_remove_duplicates(ref_map);

  for (rm = ref_map; rm; rm = rm->next) {
    if (rm->peer_ref) {
      const char *refname = rm->peer_ref->name;
      struct refname_hash_entry *peer_item;
      unsigned int hash = strhash(refname);

      if (!existing_refs_populated) {
        refname_hash_init(&existing_refs);
        refs_for_each_ref(get_main_ref_store(the_repository),
              add_one_refname,
              &existing_refs);
        existing_refs_populated = 1;
      }

      peer_item = hashmap_get_entry_from_hash(&existing_refs,
            hash, refname,
            struct refname_hash_entry, ent);
      if (peer_item) {
        struct object_id *old_oid = &peer_item->oid;
        oidcpy(&rm->peer_ref->old_oid, old_oid);
      }
    }
  }
  if (existing_refs_populated)
    hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);

  return ref_map;
}

#define STORE_REF_ERROR_OTHER 1
#define STORE_REF_ERROR_DF_CONFLICT 2

static int s_update_ref(const char *action,
      struct ref *ref,
      struct ref_transaction *transaction,
      int check_old)
{
  char *msg;
  char *rla = getenv("GIT_REFLOG_ACTION");
  struct ref_transaction *our_transaction = NULL;
  struct strbuf err = STRBUF_INIT;
  int ret;

  if (dry_run)
    return 0;
  if (!rla)
    rla = default_rla.buf;
  msg = xstrfmt("%s: %s", rla, action);

  /*
   * If no transaction was passed to us, we manage the transaction
   * ourselves. Otherwise, we trust the caller to handle the transaction
   * lifecycle.
   */
  if (!transaction) {
    transaction = our_transaction = ref_store_transaction_begin(get_main_ref_store(the_repository),
                      &err);
    if (!transaction) {
      ret = STORE_REF_ERROR_OTHER;
      goto out;
    }
  }

  ret = ref_transaction_update(transaction, ref->name, &ref->new_oid,
             check_old ? &ref->old_oid : NULL,
             NULL, NULL, 0, msg, &err);
  if (ret) {
    ret = STORE_REF_ERROR_OTHER;
    goto out;
  }

  if (our_transaction) {
    switch (ref_transaction_commit(our_transaction, &err)) {
    case 0:
      break;
    case TRANSACTION_NAME_CONFLICT:
      ret = STORE_REF_ERROR_DF_CONFLICT;
      goto out;
    default:
      ret = STORE_REF_ERROR_OTHER;
      goto out;
    }
  }

out:
  ref_transaction_free(our_transaction);
  if (ret)
    error("%s", err.buf);
  strbuf_release(&err);
  free(msg);
  return ret;
}

static int refcol_width(const struct ref *ref_map, int compact_format)
{
  const struct ref *ref;
  int max, width = 10;

  max = term_columns();
  if (compact_format)
    max = max * 2 / 3;

  for (ref = ref_map; ref; ref = ref->next) {
    int rlen, llen = 0, len;

    if (ref->status == REF_STATUS_REJECT_SHALLOW ||
        !ref->peer_ref ||
        !strcmp(ref->name, "HEAD"))
      continue;

    /* uptodate lines are only shown on high verbosity level */
    if (verbosity <= 0 && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
      continue;

    rlen = utf8_strwidth(prettify_refname(ref->name));
    if (!compact_format)
      llen = utf8_strwidth(prettify_refname(ref->peer_ref->name));

    /*
     * rough estimation to see if the output line is too long and
     * should not be counted (we can't do precise calculation
     * anyway because we don't know if the error explanation part
     * will be printed in update_local_ref)
     */
    len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
    if (len >= max)
      continue;

    if (width < rlen)
      width = rlen;
  }

  return width;
}

static void display_state_init(struct display_state *display_state, struct ref *ref_map,
             const char *raw_url, enum display_format format)
{
  int i;

  memset(display_state, 0, sizeof(*display_state));
  strbuf_init(&display_state->buf, 0);
  display_state->format = format;

  if (raw_url)
    display_state->url = transport_anonymize_url(raw_url);
  else
    display_state->url = xstrdup("foreign");

  display_state->url_len = strlen(display_state->url);
  for (i = display_state->url_len - 1; display_state->url[i] == '/' && 0 <= i; i--)
    ;
  display_state->url_len = i + 1;
  if (4 < i && !strncmp(".git", display_state->url + i - 3, 4))
    display_state->url_len = i - 3;

  if (verbosity < 0)
    return;

  switch (display_state->format) {
  case DISPLAY_FORMAT_FULL:
  case DISPLAY_FORMAT_COMPACT:
    display_state->refcol_width = refcol_width(ref_map,
                 display_state->format == DISPLAY_FORMAT_COMPACT);
    break;
  case DISPLAY_FORMAT_PORCELAIN:
    /* We don't need to precompute anything here. */
    break;
  default:
    BUG("unexpected display format %d", display_state->format);
  }
}

static void display_state_release(struct display_state *display_state)
{
  strbuf_release(&display_state->buf);
  free(display_state->url);
}

static void print_remote_to_local(struct display_state *display_state,
          const char *remote, const char *local)
{
  strbuf_addf(&display_state->buf, "%-*s -> %s",
        display_state->refcol_width, remote, local);
}

static int find_and_replace(struct strbuf *haystack,
          const char *needle,
          const char *placeholder)
{
  const char *p = NULL;
  int plen, nlen;

  nlen = strlen(needle);
  if (ends_with(haystack->buf, needle))
    p = haystack->buf + haystack->len - nlen;
  else
    p = strstr(haystack->buf, needle);
  if (!p)
    return 0;

  if (p > haystack->buf && p[-1] != '/')
    return 0;

  plen = strlen(p);
  if (plen > nlen && p[nlen] != '/')
    return 0;

  strbuf_splice(haystack, p - haystack->buf, nlen,
          placeholder, strlen(placeholder));
  return 1;
}

static void print_compact(struct display_state *display_state,
        const char *remote, const char *local)
{
  struct strbuf r = STRBUF_INIT;
  struct strbuf l = STRBUF_INIT;

  if (!strcmp(remote, local)) {
    strbuf_addf(&display_state->buf, "%-*s -> *", display_state->refcol_width, remote);
    return;
  }

  strbuf_addstr(&r, remote);
  strbuf_addstr(&l, local);

  if (!find_and_replace(&r, local, "*"))
    find_and_replace(&l, remote, "*");
  print_remote_to_local(display_state, r.buf, l.buf);

  strbuf_release(&r);
  strbuf_release(&l);
}

static void display_ref_update(struct display_state *display_state, char code,
             const char *summary, const char *error,
             const char *remote, const char *local,
             const struct object_id *old_oid,
             const struct object_id *new_oid,
             int summary_width)
{
  FILE *f = stderr;

  if (verbosity < 0)
    return;

  strbuf_reset(&display_state->buf);

  switch (display_state->format) {
  case DISPLAY_FORMAT_FULL:
  case DISPLAY_FORMAT_COMPACT: {
    int width;

    if (!display_state->shown_url) {
      strbuf_addf(&display_state->buf, _("From %.*s\n"),
            display_state->url_len, display_state->url);
      display_state->shown_url = 1;
    }

    width = (summary_width + strlen(summary) - gettext_width(summary));
    remote = prettify_refname(remote);
    local = prettify_refname(local);

    strbuf_addf(&display_state->buf, " %c %-*s ", code, width, summary);

    if (display_state->format != DISPLAY_FORMAT_COMPACT)
      print_remote_to_local(display_state, remote, local);
    else
      print_compact(display_state, remote, local);

    if (error)
      strbuf_addf(&display_state->buf, "  (%s)", error);

    break;
  }
  case DISPLAY_FORMAT_PORCELAIN:
    strbuf_addf(&display_state->buf, "%c %s %s %s", code,
          oid_to_hex(old_oid), oid_to_hex(new_oid), local);
    f = stdout;
    break;
  default:
    BUG("unexpected display format %d", display_state->format);
  };
  strbuf_addch(&display_state->buf, '\n');

  fputs(display_state->buf.buf, f);
}

static int update_local_ref(struct ref *ref,
          struct ref_transaction *transaction,
          struct display_state *display_state,
          const struct ref *remote_ref,
          int summary_width,
          const struct fetch_config *config)
{
  struct commit *current = NULL, *updated;
  int fast_forward = 0;

  if (!repo_has_object_file(the_repository, &ref->new_oid))
    die(_("object %s not found"), oid_to_hex(&ref->new_oid));

  if (oideq(&ref->old_oid, &ref->new_oid)) {
    if (verbosity > 0)
      display_ref_update(display_state, '=', _("[up to date]"), NULL,
             remote_ref->name, ref->name,
             &ref->old_oid, &ref->new_oid, summary_width);
    return 0;
  }

  if (!update_head_ok &&
      !is_null_oid(&ref->old_oid) &&
      branch_checked_out(ref->name)) {
    /*
     * If this is the head, and it's not okay to update
     * the head, and the old value of the head isn't empty...
     */
    display_ref_update(display_state, '!', _("[rejected]"),
           _("can't fetch into checked-out branch"),
           remote_ref->name, ref->name,
           &ref->old_oid, &ref->new_oid, summary_width);
    return 1;
  }

  if (!is_null_oid(&ref->old_oid) &&
      starts_with(ref->name, "refs/tags/")) {
    if (force || ref->force) {
      int r;
      r = s_update_ref("updating tag", ref, transaction, 0);
      display_ref_update(display_state, r ? '!' : 't', _("[tag update]"),
             r ? _("unable to update local ref") : NULL,
             remote_ref->name, ref->name,
             &ref->old_oid, &ref->new_oid, summary_width);
      return r;
    } else {
      display_ref_update(display_state, '!', _("[rejected]"),
             _("would clobber existing tag"),
             remote_ref->name, ref->name,
             &ref->old_oid, &ref->new_oid, summary_width);
      return 1;
    }
  }

  current = lookup_commit_reference_gently(the_repository,
             &ref->old_oid, 1);
  updated = lookup_commit_reference_gently(the_repository,
             &ref->new_oid, 1);
  if (!current || !updated) {
    const char *msg;
    const char *what;
    int r;
    /*
     * Nicely describe the new ref we're fetching.
     * Base this on the remote's ref name, as it's
     * more likely to follow a standard layout.
     */
    if (starts_with(remote_ref->name, "refs/tags/")) {
      msg = "storing tag";
      what = _("[new tag]");
    } else if (starts_with(remote_ref->name, "refs/heads/")) {
      msg = "storing head";
      what = _("[new branch]");
    } else {
      msg = "storing ref";
      what = _("[new ref]");
    }

    r = s_update_ref(msg, ref, transaction, 0);
    display_ref_update(display_state, r ? '!' : '*', what,
           r ? _("unable to update local ref") : NULL,
           remote_ref->name, ref->name,
           &ref->old_oid, &ref->new_oid, summary_width);
    return r;
  }

  if (config->show_forced_updates) {
    uint64_t t_before = getnanotime();
    fast_forward = repo_in_merge_bases(the_repository, current,
               updated);
    if (fast_forward < 0)
      exit(128);
    forced_updates_ms += (getnanotime() - t_before) / 1000000;
  } else {
    fast_forward = 1;
  }

  if (fast_forward) {
    struct strbuf quickref = STRBUF_INIT;
    int r;

    strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
    strbuf_addstr(&quickref, "..");
    strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
    r = s_update_ref("fast-forward", ref, transaction, 1);
    display_ref_update(display_state, r ? '!' : ' ', quickref.buf,
           r ? _("unable to update local ref") : NULL,
           remote_ref->name, ref->name,
           &ref->old_oid, &ref->new_oid, summary_width);
    strbuf_release(&quickref);
    return r;
  } else if (force || ref->force) {
    struct strbuf quickref = STRBUF_INIT;
    int r;
    strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
    strbuf_addstr(&quickref, "...");
    strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
    r = s_update_ref("forced-update", ref, transaction, 1);
    display_ref_update(display_state, r ? '!' : '+', quickref.buf,
           r ? _("unable to update local ref") : _("forced update"),
           remote_ref->name, ref->name,
           &ref->old_oid, &ref->new_oid, summary_width);
    strbuf_release(&quickref);
    return r;
  } else {
    display_ref_update(display_state, '!', _("[rejected]"), _("non-fast-forward"),
           remote_ref->name, ref->name,
           &ref->old_oid, &ref->new_oid, summary_width);
    return 1;
  }
}

static const struct object_id *iterate_ref_map(void *cb_data)
{
  struct ref **rm = cb_data;
  struct ref *ref = *rm;

  while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
    ref = ref->next;
  if (!ref)
    return NULL;
  *rm = ref->next;
  return &ref->old_oid;
}

struct fetch_head {
  FILE *fp;
  struct strbuf buf;
};

static int open_fetch_head(struct fetch_head *fetch_head)
{
  const char *filename = git_path_fetch_head(the_repository);

  if (write_fetch_head) {
    fetch_head->fp = fopen(filename, "a");
    if (!fetch_head->fp)
      return error_errno(_("cannot open '%s'"), filename);
    strbuf_init(&fetch_head->buf, 0);
  } else {
    fetch_head->fp = NULL;
  }

  return 0;
}

static void append_fetch_head(struct fetch_head *fetch_head,
            const struct object_id *old_oid,
            enum fetch_head_status fetch_head_status,
            const char *note,
            const char *url, size_t url_len)
{
  char old_oid_hex[GIT_MAX_HEXSZ + 1];
  const char *merge_status_marker;
  size_t i;

  if (!fetch_head->fp)
    return;

  switch (fetch_head_status) {
  case FETCH_HEAD_NOT_FOR_MERGE:
    merge_status_marker = "not-for-merge";
    break;
  case FETCH_HEAD_MERGE:
    merge_status_marker = "";
    break;
  default:
    /* do not write anything to FETCH_HEAD */
    return;
  }

  strbuf_addf(&fetch_head->buf, "%s\t%s\t%s",
        oid_to_hex_r(old_oid_hex, old_oid), merge_status_marker, note);
  for (i = 0; i < url_len; ++i)
    if ('\n' == url[i])
      strbuf_addstr(&fetch_head->buf, "\\n");
    else
      strbuf_addch(&fetch_head->buf, url[i]);
  strbuf_addch(&fetch_head->buf, '\n');

  /*
   * When using an atomic fetch, we do not want to update FETCH_HEAD if
   * any of the reference updates fails. We thus have to write all
   * updates to a buffer first and only commit it as soon as all
   * references have been successfully updated.
   */
  if (!atomic_fetch) {
    strbuf_write(&fetch_head->buf, fetch_head->fp);
    strbuf_reset(&fetch_head->buf);
  }
}

static void commit_fetch_head(struct fetch_head *fetch_head)
{
  if (!fetch_head->fp || !atomic_fetch)
    return;
  strbuf_write(&fetch_head->buf, fetch_head->fp);
}

static void close_fetch_head(struct fetch_head *fetch_head)
{
  if (!fetch_head->fp)
    return;

  fclose(fetch_head->fp);
  strbuf_release(&fetch_head->buf);
}

static const char warn_show_forced_updates[] =
N_("fetch normally indicates which branches had a forced update,\n"
   "but that check has been disabled; to re-enable, use '--show-forced-updates'\n"
   "flag or run 'git config fetch.showForcedUpdates true'");
static const char warn_time_show_forced_updates[] =
N_("it took %.2f seconds to check forced updates; you can use\n"
   "'--no-show-forced-updates' or run 'git config fetch.showForcedUpdates false'\n"
   "to avoid this check\n");

static int store_updated_refs(struct display_state *display_state,
            const char *remote_name,
            int connectivity_checked,
            struct ref_transaction *transaction, struct ref *ref_map,
            struct fetch_head *fetch_head,
            const struct fetch_config *config)
{
  int rc = 0;
  struct strbuf note = STRBUF_INIT;
  const char *what, *kind;
  struct ref *rm;
  int want_status;
  int summary_width = 0;

  if (verbosity >= 0)
    summary_width = transport_summary_width(ref_map);

  if (!connectivity_checked) {
    struct check_connected_options opt = CHECK_CONNECTED_INIT;

    opt.exclude_hidden_refs_section = "fetch";
    rm = ref_map;
    if (check_connected(iterate_ref_map, &rm, &opt)) {
      rc = error(_("%s did not send all necessary objects"),
           display_state->url);
      goto abort;
    }
  }

  /*
   * We do a pass for each fetch_head_status type in their enum order, so
   * merged entries are written before not-for-merge. That lets readers
   * use FETCH_HEAD as a refname to refer to the ref to be merged.
   */
  for (want_status = FETCH_HEAD_MERGE;
       want_status <= FETCH_HEAD_IGNORE;
       want_status++) {
    for (rm = ref_map; rm; rm = rm->next) {
      struct ref *ref = NULL;

      if (rm->status == REF_STATUS_REJECT_SHALLOW) {
        if (want_status == FETCH_HEAD_MERGE)
          warning(_("rejected %s because shallow roots are not allowed to be updated"),
            rm->peer_ref ? rm->peer_ref->name : rm->name);
        continue;
      }

      /*
       * When writing FETCH_HEAD we need to determine whether
       * we already have the commit or not. If not, then the
       * reference is not for merge and needs to be written
       * to the reflog after other commits which we already
       * have. We're not interested in this property though
       * in case FETCH_HEAD is not to be updated, so we can
       * skip the classification in that case.
       */
      if (fetch_head->fp) {
        struct commit *commit = NULL;

        /*
         * References in "refs/tags/" are often going to point
         * to annotated tags, which are not part of the
         * commit-graph. We thus only try to look up refs in
         * the graph which are not in that namespace to not
         * regress performance in repositories with many
         * annotated tags.
         */
        if (!starts_with(rm->name, "refs/tags/"))
          commit = lookup_commit_in_graph(the_repository, &rm->old_oid);
        if (!commit) {
          commit = lookup_commit_reference_gently(the_repository,
                    &rm->old_oid,
                    1);
          if (!commit)
            rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
        }
      }

      if (rm->fetch_head_status != want_status)
        continue;

      if (rm->peer_ref) {
        ref = alloc_ref(rm->peer_ref->name);
        oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
        oidcpy(&ref->new_oid, &rm->old_oid);
        ref->force = rm->peer_ref->force;
      }

      if (config->recurse_submodules != RECURSE_SUBMODULES_OFF &&
          (!rm->peer_ref || !oideq(&ref->old_oid, &ref->new_oid))) {
        check_for_new_submodule_commits(&rm->old_oid);
      }

      if (!strcmp(rm->name, "HEAD")) {
        kind = "";
        what = "";
      } else if (skip_prefix(rm->name, "refs/heads/", &what)) {
        kind = "branch";
      } else if (skip_prefix(rm->name, "refs/tags/", &what)) {
        kind = "tag";
      } else if (skip_prefix(rm->name, "refs/remotes/", &what)) {
        kind = "remote-tracking branch";
      } else {
        kind = "";
        what = rm->name;
      }

      strbuf_reset(&note);
      if (*what) {
        if (*kind)
          strbuf_addf(&note, "%s ", kind);
        strbuf_addf(&note, "'%s' of ", what);
      }

      append_fetch_head(fetch_head, &rm->old_oid,
            rm->fetch_head_status,
            note.buf, display_state->url,
            display_state->url_len);

      if (ref) {
        rc |= update_local_ref(ref, transaction, display_state,
                   rm, summary_width, config);
        free(ref);
      } else if (write_fetch_head || dry_run) {
        /*
         * Display fetches written to FETCH_HEAD (or
         * would be written to FETCH_HEAD, if --dry-run
         * is set).
         */
        display_ref_update(display_state, '*',
               *kind ? kind : "branch", NULL,
               rm->name,
               "FETCH_HEAD",
               &rm->new_oid, &rm->old_oid,
               summary_width);
      }
    }
  }

  if (rc & STORE_REF_ERROR_DF_CONFLICT)
    error(_("some local refs could not be updated; try running\n"
          " 'git remote prune %s' to remove any old, conflicting "
          "branches"), remote_name);

  if (advice_enabled(ADVICE_FETCH_SHOW_FORCED_UPDATES)) {
    if (!config->show_forced_updates) {
      warning(_(warn_show_forced_updates));
    } else if (forced_updates_ms > FORCED_UPDATES_DELAY_WARNING_IN_MS) {
      warning(_(warn_time_show_forced_updates),
        forced_updates_ms / 1000.0);
    }
  }

 abort:
  strbuf_release(&note);
  return rc;
}

/*
 * We would want to bypass the object transfer altogether if
 * everything we are going to fetch already exists and is connected
 * locally.
 */
static int check_exist_and_connected(struct ref *ref_map)
{
  struct ref *rm = ref_map;
  struct check_connected_options opt = CHECK_CONNECTED_INIT;
  struct ref *r;

  /*
   * If we are deepening a shallow clone we already have these
   * objects reachable.  Running rev-list here will return with
   * a good (0) exit status and we'll bypass the fetch that we
   * really need to perform.  Claiming failure now will ensure
   * we perform the network exchange to deepen our history.
   */
  if (deepen)
    return -1;

  /*
   * Similarly, if we need to refetch, we always want to perform a full
   * fetch ignoring existing objects.
   */
  if (refetch)
    return -1;


  /*
   * check_connected() allows objects to merely be promised, but
   * we need all direct targets to exist.
   */
  for (r = rm; r; r = r->next) {
    if (!repo_has_object_file_with_flags(the_repository, &r->old_oid,
                 OBJECT_INFO_SKIP_FETCH_OBJECT))
      return -1;
  }

  opt.quiet = 1;
  opt.exclude_hidden_refs_section = "fetch";
  return check_connected(iterate_ref_map, &rm, &opt);
}

static int fetch_and_consume_refs(struct display_state *display_state,
          struct transport *transport,
          struct ref_transaction *transaction,
          struct ref *ref_map,
          struct fetch_head *fetch_head,
          const struct fetch_config *config)
{
  int connectivity_checked = 1;
  int ret;

  /*
   * We don't need to perform a fetch in case we can already satisfy all
   * refs.
   */
  ret = check_exist_and_connected(ref_map);
  if (ret) {
    trace2_region_enter("fetch", "fetch_refs", the_repository);
    ret = transport_fetch_refs(transport, ref_map);
    trace2_region_leave("fetch", "fetch_refs", the_repository);
    if (ret)
      goto out;
    connectivity_checked = transport->smart_options ?
      transport->smart_options->connectivity_checked : 0;
  }

  trace2_region_enter("fetch", "consume_refs", the_repository);
  ret = store_updated_refs(display_state, transport->remote->name,
         connectivity_checked, transaction, ref_map,
         fetch_head, config);
  trace2_region_leave("fetch", "consume_refs", the_repository);

out:
  transport_unlock_pack(transport, 0);
  return ret;
}

static int prune_refs(struct display_state *display_state,
          struct refspec *rs,
          struct ref_transaction *transaction,
          struct ref *ref_map)
{
  int result = 0;
  struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
  struct strbuf err = STRBUF_INIT;
  const char *dangling_msg = dry_run
    ? _("   (%s will become dangling)")
    : _("   (%s has become dangling)");

  if (!dry_run) {
    if (transaction) {
      for (ref = stale_refs; ref; ref = ref->next) {
        result = ref_transaction_delete(transaction, ref->name, NULL,
                NULL, 0, "fetch: prune", &err);
        if (result)
          goto cleanup;
      }
    } else {
      struct string_list refnames = STRING_LIST_INIT_NODUP;

      for (ref = stale_refs; ref; ref = ref->next)
        string_list_append(&refnames, ref->name);

      result = refs_delete_refs(get_main_ref_store(the_repository),
              "fetch: prune", &refnames,
              0);
      string_list_clear(&refnames, 0);
    }
  }

  if (verbosity >= 0) {
    int summary_width = transport_summary_width(stale_refs);

    for (ref = stale_refs; ref; ref = ref->next) {
      display_ref_update(display_state, '-', _("[deleted]"), NULL,
             _("(none)"), ref->name,
             &ref->new_oid, &ref->old_oid,
             summary_width);
      refs_warn_dangling_symref(get_main_ref_store(the_repository),
              stderr, dangling_msg, ref->name);
    }
  }

cleanup:
  strbuf_release(&err);
  free_refs(stale_refs);
  return result;
}

static void check_not_current_branch(struct ref *ref_map)
{
  const char *path;
  for (; ref_map; ref_map = ref_map->next)
    if (ref_map->peer_ref &&
        starts_with(ref_map->peer_ref->name, "refs/heads/") &&
        (path = branch_checked_out(ref_map->peer_ref->name)))
      die(_("refusing to fetch into branch '%s' "
            "checked out at '%s'"),
          ref_map->peer_ref->name, path);
}

static int truncate_fetch_head(void)
{
  const char *filename = git_path_fetch_head(the_repository);
  FILE *fp = fopen_for_writing(filename);

  if (!fp)
    return error_errno(_("cannot open '%s'"), filename);
  fclose(fp);
  return 0;
}

static void set_option(struct transport *transport, const char *name, const char *value)
{
  int r = transport_set_option(transport, name, value);
  if (r < 0)
    die(_("option \"%s\" value \"%s\" is not valid for %s"),
        name, value, transport->url);
  if (r > 0)
    warning(_("option \"%s\" is ignored for %s"),
      name, transport->url);
}


static int add_oid(const char *refname UNUSED,
       const char *referent UNUSED,
       const struct object_id *oid,
       int flags UNUSED, void *cb_data)
{
  struct oid_array *oids = cb_data;

  oid_array_append(oids, oid);
  return 0;
}

static void add_negotiation_tips(struct git_transport_options *smart_options)
{
  struct oid_array *oids = xcalloc(1, sizeof(*oids));
  int i;

  for (i = 0; i < negotiation_tip.nr; i++) {
    const char *s = negotiation_tip.items[i].string;
    int old_nr;
    if (!has_glob_specials(s)) {
      struct object_id oid;
      if (repo_get_oid(the_repository, s, &oid))
        die(_("%s is not a valid object"), s);
      if (!has_object(the_repository, &oid, 0))
        die(_("the object %s does not exist"), s);
      oid_array_append(oids, &oid);
      continue;
    }
    old_nr = oids->nr;
    refs_for_each_glob_ref(get_main_ref_store(the_repository),
               add_oid, s, oids);
    if (old_nr == oids->nr)
      warning("ignoring --negotiation-tip=%s because it does not match any refs",
        s);
  }
  smart_options->negotiation_tips = oids;
}

static struct transport *prepare_transport(struct remote *remote, int deepen)
{
  struct transport *transport;

  transport = transport_get(remote, NULL);
  transport_set_verbosity(transport, verbosity, progress);
  transport->family = family;
  if (upload_pack)
    set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
  if (keep)
    set_option(transport, TRANS_OPT_KEEP, "yes");
  if (depth)
    set_option(transport, TRANS_OPT_DEPTH, depth);
  if (deepen && deepen_since)
    set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
  if (deepen && deepen_not.nr)
    set_option(transport, TRANS_OPT_DEEPEN_NOT,
         (const char *)&deepen_not);
  if (deepen_relative)
    set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
  if (update_shallow)
    set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
  if (refetch)
    set_option(transport, TRANS_OPT_REFETCH, "yes");
  if (filter_options.choice) {
    const char *spec =
      expand_list_objects_filter_spec(&filter_options);
    set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER, spec);
    set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
  }
  if (negotiation_tip.nr) {
    if (transport->smart_options)
      add_negotiation_tips(transport->smart_options);
    else
      warning("ignoring --negotiation-tip because the protocol does not support it");
  }
  return transport;
}

static int backfill_tags(struct display_state *display_state,
       struct transport *transport,
       struct ref_transaction *transaction,
       struct ref *ref_map,
       struct fetch_head *fetch_head,
       const struct fetch_config *config)
{
  int retcode, cannot_reuse;

  /*
   * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
   * when remote helper is used (setting it to an empty string
   * is not unsetting). We could extend the remote helper
   * protocol for that, but for now, just force a new connection
   * without deepen-since. Similar story for deepen-not.
   */
  cannot_reuse = transport->cannot_reuse ||
    deepen_since || deepen_not.nr;
  if (cannot_reuse) {
    gsecondary = prepare_transport(transport->remote, 0);
    transport = gsecondary;
  }

  transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
  transport_set_option(transport, TRANS_OPT_DEPTH, "0");
  transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
  retcode = fetch_and_consume_refs(display_state, transport, transaction, ref_map,
           fetch_head, config);

  if (gsecondary) {
    transport_disconnect(gsecondary);
    gsecondary = NULL;
  }

  return retcode;
}

static int do_fetch(struct transport *transport,
        struct refspec *rs,
        const struct fetch_config *config)
{
  struct ref_transaction *transaction = NULL;
  struct ref *ref_map = NULL;
  struct display_state display_state = { 0 };
  int autotags = (transport->remote->fetch_tags == 1);
  int retcode = 0;
  const struct ref *remote_refs;
  struct transport_ls_refs_options transport_ls_refs_options =
    TRANSPORT_LS_REFS_OPTIONS_INIT;
  int must_list_refs = 1;
  struct fetch_head fetch_head = { 0 };
  struct strbuf err = STRBUF_INIT;

  if (tags == TAGS_DEFAULT) {
    if (transport->remote->fetch_tags == 2)
      tags = TAGS_SET;
    if (transport->remote->fetch_tags == -1)
      tags = TAGS_UNSET;
  }

  /* if not appending, truncate FETCH_HEAD */
  if (!append && write_fetch_head) {
    retcode = truncate_fetch_head();
    if (retcode)
      goto cleanup;
  }

  if (rs->nr) {
    int i;

    refspec_ref_prefixes(rs, &transport_ls_refs_options.ref_prefixes);

    /*
     * We can avoid listing refs if all of them are exact
     * OIDs
     */
    must_list_refs = 0;
    for (i = 0; i < rs->nr; i++) {
      if (!rs->items[i].exact_sha1) {
        must_list_refs = 1;
        break;
      }
    }
  } else {
    struct branch *branch = branch_get(NULL);

    if (transport->remote->fetch.nr)
      refspec_ref_prefixes(&transport->remote->fetch,
               &transport_ls_refs_options.ref_prefixes);
    if (branch_has_merge_config(branch) &&
        !strcmp(branch->remote_name, transport->remote->name)) {
      int i;
      for (i = 0; i < branch->merge_nr; i++) {
        strvec_push(&transport_ls_refs_options.ref_prefixes,
              branch->merge[i]->src);
      }
    }
  }

  if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
    must_list_refs = 1;
    if (transport_ls_refs_options.ref_prefixes.nr)
      strvec_push(&transport_ls_refs_options.ref_prefixes,
            "refs/tags/");
  }

  if (must_list_refs) {
    trace2_region_enter("fetch", "remote_refs", the_repository);
    remote_refs = transport_get_remote_refs(transport,
              &transport_ls_refs_options);
    trace2_region_leave("fetch", "remote_refs", the_repository);
  } else
    remote_refs = NULL;

  transport_ls_refs_options_release(&transport_ls_refs_options);

  ref_map = get_ref_map(transport->remote, remote_refs, rs,
            tags, &autotags);
  if (!update_head_ok)
    check_not_current_branch(ref_map);

  retcode = open_fetch_head(&fetch_head);
  if (retcode)
    goto cleanup;

  display_state_init(&display_state, ref_map, transport->url,
         config->display_format);

  if (atomic_fetch) {
    transaction = ref_store_transaction_begin(get_main_ref_store(the_repository),
                &err);
    if (!transaction) {
      retcode = -1;
      goto cleanup;
    }
  }

  if (tags == TAGS_DEFAULT && autotags)
    transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
  if (prune) {
    /*
     * We only prune based on refspecs specified
     * explicitly (via command line or configuration); we
     * don't care whether --tags was specified.
     */
    if (rs->nr) {
      retcode = prune_refs(&display_state, rs, transaction, ref_map);
    } else {
      retcode = prune_refs(&display_state, &transport->remote->fetch,
               transaction, ref_map);
    }
    if (retcode != 0)
      retcode = 1;
  }

  if (fetch_and_consume_refs(&display_state, transport, transaction, ref_map,
           &fetch_head, config)) {
    retcode = 1;
    goto cleanup;
  }

  /*
   * If neither --no-tags nor --tags was specified, do automated tag
   * following.
   */
  if (tags == TAGS_DEFAULT && autotags) {
    struct ref *tags_ref_map = NULL, **tail = &tags_ref_map;

    find_non_local_tags(remote_refs, transaction, &tags_ref_map, &tail);
    if (tags_ref_map) {
      /*
       * If backfilling of tags fails then we want to tell
       * the user so, but we have to continue regardless to
       * populate upstream information of the references we
       * have already fetched above. The exception though is
       * when `--atomic` is passed: in that case we'll abort
       * the transaction and don't commit anything.
       */
      if (backfill_tags(&display_state, transport, transaction, tags_ref_map,
            &fetch_head, config))
        retcode = 1;
    }

    free_refs(tags_ref_map);
  }

  if (transaction) {
    if (retcode)
      goto cleanup;

    retcode = ref_transaction_commit(transaction, &err);
    if (retcode)
      goto cleanup;
  }

  commit_fetch_head(&fetch_head);

  if (set_upstream) {
    struct branch *branch = branch_get("HEAD");
    struct ref *rm;
    struct ref *source_ref = NULL;

    /*
     * We're setting the upstream configuration for the
     * current branch. The relevant upstream is the
     * fetched branch that is meant to be merged with the
     * current one, i.e. the one fetched to FETCH_HEAD.
     *
     * When there are several such branches, consider the
     * request ambiguous and err on the safe side by doing
     * nothing and just emit a warning.
     */
    for (rm = ref_map; rm; rm = rm->next) {
      if (!rm->peer_ref) {
        if (source_ref) {
          warning(_("multiple branches detected, incompatible with --set-upstream"));
          goto cleanup;
        } else {
          source_ref = rm;
        }
      }
    }
    if (source_ref) {
      if (!branch) {
        const char *shortname = source_ref->name;
        skip_prefix(shortname, "refs/heads/", &shortname);

        warning(_("could not set upstream of HEAD to '%s' from '%s' when "
            "it does not point to any branch."),
          shortname, transport->remote->name);
        goto cleanup;
      }

      if (!strcmp(source_ref->name, "HEAD") ||
          starts_with(source_ref->name, "refs/heads/"))
        install_branch_config(0,
                  branch->name,
                  transport->remote->name,
                  source_ref->name);
      else if (starts_with(source_ref->name, "refs/remotes/"))
        warning(_("not setting upstream for a remote remote-tracking branch"));
      else if (starts_with(source_ref->name, "refs/tags/"))
        warning(_("not setting upstream for a remote tag"));
      else
        warning(_("unknown branch type"));
    } else {
      warning(_("no source branch found;\n"
          "you need to specify exactly one branch with the --set-upstream option"));
    }
  }

cleanup:
  if (retcode) {
    if (err.len) {
      error("%s", err.buf);
      strbuf_reset(&err);
    }
    if (transaction && ref_transaction_abort(transaction, &err) &&
        err.len)
      error("%s", err.buf);
    transaction = NULL;
  }

  if (transaction)
    ref_transaction_free(transaction);
  display_state_release(&display_state);
  close_fetch_head(&fetch_head);
  strbuf_release(&err);
  free_refs(ref_map);
  return retcode;
}

static int get_one_remote_for_fetch(struct remote *remote, void *priv)
{
  struct string_list *list = priv;
  if (!remote->skip_default_update)
    string_list_append(list, remote->name);
  return 0;
}

struct remote_group_data {
  const char *name;
  struct string_list *list;
};

static int get_remote_group(const char *key, const char *value,
          const struct config_context *ctx UNUSED,
          void *priv)
{
  struct remote_group_data *g = priv;

  if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
    /* split list by white space */
    while (*value) {
      size_t wordlen = strcspn(value, " \t\n");

      if (wordlen >= 1)
        string_list_append_nodup(g->list,
               xstrndup(value, wordlen));
      value += wordlen + (value[wordlen] != '\0');
    }
  }

  return 0;
}

static int add_remote_or_group(const char *name, struct string_list *list)
{
  int prev_nr = list->nr;
  struct remote_group_data g;
  g.name = name; g.list = list;

  git_config(get_remote_group, &g);
  if (list->nr == prev_nr) {
    struct remote *remote = remote_get(name);
    if (!remote_is_configured(remote, 0))
      return 0;
    string_list_append(list, remote->name);
  }
  return 1;
}

static void add_options_to_argv(struct strvec *argv,
        const struct fetch_config *config)
{
  if (dry_run)
    strvec_push(argv, "--dry-run");
  if (prune != -1)
    strvec_push(argv, prune ? "--prune" : "--no-prune");
  if (prune_tags != -1)
    strvec_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
  if (update_head_ok)
    strvec_push(argv, "--update-head-ok");
  if (force)
    strvec_push(argv, "--force");
  if (keep)
    strvec_push(argv, "--keep");
  if (config->recurse_submodules == RECURSE_SUBMODULES_ON)
    strvec_push(argv, "--recurse-submodules");
  else if (config->recurse_submodules == RECURSE_SUBMODULES_OFF)
    strvec_push(argv, "--no-recurse-submodules");
  else if (config->recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
    strvec_push(argv, "--recurse-submodules=on-demand");
  if (tags == TAGS_SET)
    strvec_push(argv, "--tags");
  else if (tags == TAGS_UNSET)
    strvec_push(argv, "--no-tags");
  if (verbosity >= 2)
    strvec_push(argv, "-v");
  if (verbosity >= 1)
    strvec_push(argv, "-v");
  else if (verbosity < 0)
    strvec_push(argv, "-q");
  if (family == TRANSPORT_FAMILY_IPV4)
    strvec_push(argv, "--ipv4");
  else if (family == TRANSPORT_FAMILY_IPV6)
    strvec_push(argv, "--ipv6");
  if (!write_fetch_head)
    strvec_push(argv, "--no-write-fetch-head");
  if (config->display_format == DISPLAY_FORMAT_PORCELAIN)
    strvec_pushf(argv, "--porcelain");
}

/* Fetch multiple remotes in parallel */

struct parallel_fetch_state {
  const char **argv;
  struct string_list *remotes;
  int next, result;
  const struct fetch_config *config;
};

static int fetch_next_remote(struct child_process *cp,
           struct strbuf *out UNUSED,
           void *cb, void **task_cb)
{
  struct parallel_fetch_state *state = cb;
  char *remote;

  if (state->next < 0 || state->next >= state->remotes->nr)
    return 0;

  remote = state->remotes->items[state->next++].string;
  *task_cb = remote;

  strvec_pushv(&cp->args, state->argv);
  strvec_push(&cp->args, remote);
  cp->git_cmd = 1;

  if (verbosity >= 0 && state->config->display_format != DISPLAY_FORMAT_PORCELAIN)
    printf(_("Fetching %s\n"), remote);

  return 1;
}

static int fetch_failed_to_start(struct strbuf *out UNUSED,
         void *cb, void *task_cb)
{
  struct parallel_fetch_state *state = cb;
  const char *remote = task_cb;

  state->result = error(_("could not fetch %s"), remote);

  return 0;
}

static int fetch_finished(int result, struct strbuf *out,
        void *cb, void *task_cb)
{
  struct parallel_fetch_state *state = cb;
  const char *remote = task_cb;

  if (result) {
    strbuf_addf(out, _("could not fetch '%s' (exit code: %d)\n"),
          remote, result);
    state->result = -1;
  }

  return 0;
}

static int fetch_multiple(struct string_list *list, int max_children,
        const struct fetch_config *config)
{
  int i, result = 0;
  struct strvec argv = STRVEC_INIT;

  if (!append && write_fetch_head) {
    int errcode = truncate_fetch_head();
    if (errcode)
      return errcode;
  }

  /*
   * Cancel out the fetch.bundleURI config when running subprocesses,
   * to avoid fetching from the same bundle list multiple times.
   */
  strvec_pushl(&argv, "-c", "fetch.bundleURI=",
         "fetch", "--append", "--no-auto-gc",
         "--no-write-commit-graph", NULL);
  add_options_to_argv(&argv, config);

  if (max_children != 1 && list->nr != 1) {
    struct parallel_fetch_state state = { argv.v, list, 0, 0, config };
    const struct run_process_parallel_opts opts = {
      .tr2_category = "fetch",
      .tr2_label = "parallel/fetch",

      .processes = max_children,

      .get_next_task = &fetch_next_remote,
      .start_failure = &fetch_failed_to_start,
      .task_finished = &fetch_finished,
      .data = &state,
    };

    strvec_push(&argv, "--end-of-options");

    run_processes_parallel(&opts);
    result = state.result;
  } else
    for (i = 0; i < list->nr; i++) {
      const char *name = list->items[i].string;
      struct child_process cmd = CHILD_PROCESS_INIT;

      strvec_pushv(&cmd.args, argv.v);
      strvec_push(&cmd.args, name);
      if (verbosity >= 0 && config->display_format != DISPLAY_FORMAT_PORCELAIN)
        printf(_("Fetching %s\n"), name);
      cmd.git_cmd = 1;
      if (run_command(&cmd)) {
        error(_("could not fetch %s"), name);
        result = 1;
      }
    }

  strvec_clear(&argv);
  return !!result;
}

/*
 * Fetching from the promisor remote should use the given filter-spec
 * or inherit the default filter-spec from the config.
 */
static inline void fetch_one_setup_partial(struct remote *remote)
{
  /*
   * Explicit --no-filter argument overrides everything, regardless
   * of any prior partial clones and fetches.
   */
  if (filter_options.no_filter)
    return;

  /*
   * If no prior partial clone/fetch and the current fetch DID NOT
   * request a partial-fetch, do a normal fetch.
   */
  if (!repo_has_promisor_remote(the_repository) && !filter_options.choice)
    return;

  /*
   * If this is a partial-fetch request, we enable partial on
   * this repo if not already enabled and remember the given
   * filter-spec as the default for subsequent fetches to this
   * remote if there is currently no default filter-spec.
   */
  if (filter_options.choice) {
    partial_clone_register(remote->name, &filter_options);
    return;
  }

  /*
   * Do a partial-fetch from the promisor remote using either the
   * explicitly given filter-spec or inherit the filter-spec from
   * the config.
   */
  if (!filter_options.choice)
    partial_clone_get_default_filter_spec(&filter_options, remote->name);
  return;
}

static int fetch_one(struct remote *remote, int argc, const char **argv,
         int prune_tags_ok, int use_stdin_refspecs,
         const struct fetch_config *config)
{
  struct refspec rs = REFSPEC_INIT_FETCH;
  int i;
  int exit_code;
  int maybe_prune_tags;
  int remote_via_config = remote_is_configured(remote, 0);

  if (!remote)
    die(_("no remote repository specified; please specify either a URL or a\n"
          "remote name from which new revisions should be fetched"));

  gtransport = prepare_transport(remote, 1);

  if (prune < 0) {
    /* no command line request */
    if (0 <= remote->prune)
      prune = remote->prune;
    else if (0 <= config->prune)
      prune = config->prune;
    else
      prune = PRUNE_BY_DEFAULT;
  }

  if (prune_tags < 0) {
    /* no command line request */
    if (0 <= remote->prune_tags)
      prune_tags = remote->prune_tags;
    else if (0 <= config->prune_tags)
      prune_tags = config->prune_tags;
    else
      prune_tags = PRUNE_TAGS_BY_DEFAULT;
  }

  maybe_prune_tags = prune_tags_ok && prune_tags;
  if (maybe_prune_tags && remote_via_config)
    refspec_append(&remote->fetch, TAG_REFSPEC);

  if (maybe_prune_tags && (argc || !remote_via_config))
    refspec_append(&rs, TAG_REFSPEC);

  for (i = 0; i < argc; i++) {
    if (!strcmp(argv[i], "tag")) {
      i++;
      if (i >= argc)
        die(_("you need to specify a tag name"));

      refspec_appendf(&rs, "refs/tags/%s:refs/tags/%s",
          argv[i], argv[i]);
    } else {
      refspec_append(&rs, argv[i]);
    }
  }

  if (use_stdin_refspecs) {
    struct strbuf line = STRBUF_INIT;
    while (strbuf_getline_lf(&line, stdin) != EOF)
      refspec_append(&rs, line.buf);
    strbuf_release(&line);
  }

  if (server_options.nr)
    gtransport->server_options = &server_options;

  sigchain_push_common(unlock_pack_on_signal);
  atexit(unlock_pack_atexit);
  sigchain_push(SIGPIPE, SIG_IGN);
  exit_code = do_fetch(gtransport, &rs, config);
  sigchain_pop(SIGPIPE);
  refspec_clear(&rs);
  transport_disconnect(gtransport);
  gtransport = NULL;
  return exit_code;
}

int cmd_fetch(int argc, const char **argv, const char *prefix)
{
  struct fetch_config config = {
    .display_format = DISPLAY_FORMAT_FULL,
    .prune = -1,
    .prune_tags = -1,
    .show_forced_updates = 1,
    .recurse_submodules = RECURSE_SUBMODULES_DEFAULT,
    .parallel = 1,
    .submodule_fetch_jobs = -1,
  };
  const char *submodule_prefix = "";
  const char *bundle_uri;
  struct string_list list = STRING_LIST_INIT_DUP;
  struct remote *remote = NULL;
  int all = -1, multiple = 0;
  int result = 0;
  int prune_tags_ok = 1;
  int enable_auto_gc = 1;
  int unshallow = 0;
  int max_jobs = -1;
  int recurse_submodules_cli = RECURSE_SUBMODULES_DEFAULT;
  int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
  int fetch_write_commit_graph = -1;
  int stdin_refspecs = 0;
  int negotiate_only = 0;
  int porcelain = 0;
  int i;

  struct option builtin_fetch_options[] = {
    OPT__VERBOSITY(&verbosity),
    OPT_BOOL(0, "all", &all,
       N_("fetch from all remotes")),
    OPT_BOOL(0, "set-upstream", &set_upstream,
       N_("set upstream for git pull/fetch")),
    OPT_BOOL('a', "append", &append,
       N_("append to .git/FETCH_HEAD instead of overwriting")),
    OPT_BOOL(0, "atomic", &atomic_fetch,
       N_("use atomic transaction to update references")),
    OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
         N_("path to upload pack on remote end")),
    OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
    OPT_BOOL('m', "multiple", &multiple,
       N_("fetch from multiple remotes")),
    OPT_SET_INT('t', "tags", &tags,
          N_("fetch all tags and associated objects"), TAGS_SET),
    OPT_SET_INT('n', NULL, &tags,
          N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
    OPT_INTEGER('j', "jobs", &max_jobs,
          N_("number of submodules fetched in parallel")),
    OPT_BOOL(0, "prefetch", &prefetch,
       N_("modify the refspec to place all refs within refs/prefetch/")),
    OPT_BOOL('p', "prune", &prune,
       N_("prune remote-tracking branches no longer on remote")),
    OPT_BOOL('P', "prune-tags", &prune_tags,
       N_("prune local tags no longer on remote and clobber changed tags")),
    OPT_CALLBACK_F(0, "recurse-submodules", &recurse_submodules_cli, N_("on-demand"),
          N_("control recursive fetching of submodules"),
          PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules),
    OPT_BOOL(0, "dry-run", &dry_run,
       N_("dry run")),
    OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
    OPT_BOOL(0, "write-fetch-head", &write_fetch_head,
       N_("write fetched references to the FETCH_HEAD file")),
    OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
    OPT_BOOL('u', "update-head-ok", &update_head_ok,
          N_("allow updating of HEAD ref")),
    OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
    OPT_STRING(0, "depth", &depth, N_("depth"),
         N_("deepen history of shallow clone")),
    OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
         N_("deepen history of shallow repository based on time")),
    OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
        N_("deepen history of shallow clone, excluding rev")),
    OPT_INTEGER(0, "deepen", &deepen_relative,
          N_("deepen history of shallow clone")),
    OPT_SET_INT_F(0, "unshallow", &unshallow,
            N_("convert to a complete repository"),
            1, PARSE_OPT_NONEG),
    OPT_SET_INT_F(0, "refetch", &refetch,
            N_("re-fetch without negotiating common commits"),
            1, PARSE_OPT_NONEG),
    { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
         N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
    OPT_CALLBACK_F(0, "recurse-submodules-default",
         &recurse_submodules_default, N_("on-demand"),
         N_("default for recursive fetching of submodules "
            "(lower priority than config files)"),
         PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules),
    OPT_BOOL(0, "update-shallow", &update_shallow,
       N_("accept refs that update .git/shallow")),
    OPT_CALLBACK_F(0, "refmap", &refmap, N_("refmap"),
             N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg),
    OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
    OPT_IPVERSION(&family),
    OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
        N_("report that we have only objects reachable from this object")),
    OPT_BOOL(0, "negotiate-only", &negotiate_only,
       N_("do not fetch a packfile; instead, print ancestors of negotiation tips")),
    OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
    OPT_BOOL(0, "auto-maintenance", &enable_auto_gc,
       N_("run 'maintenance --auto' after fetching")),
    OPT_BOOL(0, "auto-gc", &enable_auto_gc,
       N_("run 'maintenance --auto' after fetching")),
    OPT_BOOL(0, "show-forced-updates", &config.show_forced_updates,
       N_("check for forced-updates on all updated branches")),
    OPT_BOOL(0, "write-commit-graph", &fetch_write_commit_graph,
       N_("write the commit-graph after fetching")),
    OPT_BOOL(0, "stdin", &stdin_refspecs,
       N_("accept refspecs from stdin")),
    OPT_END()
  };

  packet_trace_identity("fetch");

  /* Record the command line for the reflog */
  strbuf_addstr(&default_rla, "fetch");
  for (i = 1; i < argc; i++) {
    /* This handles non-URLs gracefully */
    char *anon = transport_anonymize_url(argv[i]);

    strbuf_addf(&default_rla, " %s", anon);
    free(anon);
  }

  git_config(git_fetch_config, &config);
  if (the_repository->gitdir) {
    prepare_repo_settings(the_repository);
    the_repository->settings.command_requires_full_index = 0;
  }

  argc = parse_options(argc, argv, prefix,
           builtin_fetch_options, builtin_fetch_usage, 0);

  if (recurse_submodules_cli != RECURSE_SUBMODULES_DEFAULT)
    config.recurse_submodules = recurse_submodules_cli;

  if (negotiate_only) {
    switch (recurse_submodules_cli) {
    case RECURSE_SUBMODULES_OFF:
    case RECURSE_SUBMODULES_DEFAULT:
      /*
       * --negotiate-only should never recurse into
       * submodules. Skip it by setting recurse_submodules to
       * RECURSE_SUBMODULES_OFF.
       */
      config.recurse_submodules = RECURSE_SUBMODULES_OFF;
      break;

    default:
      die(_("options '%s' and '%s' cannot be used together"),
          "--negotiate-only", "--recurse-submodules");
    }
  }

  if (config.recurse_submodules != RECURSE_SUBMODULES_OFF) {
    int *sfjc = config.submodule_fetch_jobs == -1
          ? &config.submodule_fetch_jobs : NULL;
    int *rs = config.recurse_submodules == RECURSE_SUBMODULES_DEFAULT
        ? &config.recurse_submodules : NULL;

    fetch_config_from_gitmodules(sfjc, rs);
  }


  if (porcelain) {
    switch (recurse_submodules_cli) {
    case RECURSE_SUBMODULES_OFF:
    case RECURSE_SUBMODULES_DEFAULT:
      /*
       * Reference updates in submodules would be ambiguous
       * in porcelain mode, so we reject this combination.
       */
      config.recurse_submodules = RECURSE_SUBMODULES_OFF;
      break;

    default:
      die(_("options '%s' and '%s' cannot be used together"),
          "--porcelain", "--recurse-submodules");
    }

    config.display_format = DISPLAY_FORMAT_PORCELAIN;
  }

  if (negotiate_only && !negotiation_tip.nr)
    die(_("--negotiate-only needs one or more --negotiation-tip=*"));

  if (deepen_relative) {
    if (deepen_relative < 0)
      die(_("negative depth in --deepen is not supported"));
    if (depth)
      die(_("options '%s' and '%s' cannot be used together"), "--deepen", "--depth");
    depth = xstrfmt("%d", deepen_relative);
  }
  if (unshallow) {
    if (depth)
      die(_("options '%s' and '%s' cannot be used together"), "--depth", "--unshallow");
    else if (!is_repository_shallow(the_repository))
      die(_("--unshallow on a complete repository does not make sense"));
    else
      depth = xstrfmt("%d", INFINITE_DEPTH);
  }

  /* no need to be strict, transport_set_option() will validate it again */
  if (depth && atoi(depth) < 1)
    die(_("depth %s is not a positive number"), depth);
  if (depth || deepen_since || deepen_not.nr)
    deepen = 1;

  /* FETCH_HEAD never gets updated in --dry-run mode */
  if (dry_run)
    write_fetch_head = 0;

  if (!max_jobs)
    max_jobs = online_cpus();

  if (!git_config_get_string_tmp("fetch.bundleuri", &bundle_uri) &&
      fetch_bundle_uri(the_repository, bundle_uri, NULL))
    warning(_("failed to fetch bundles from '%s'"), bundle_uri);

  if (all < 0) {
    /*
     * no --[no-]all given;
     * only use config option if no remote was explicitly specified
     */
    all = (!argc) ? config.all : 0;
  }

  if (all) {
    if (argc == 1)
      die(_("fetch --all does not take a repository argument"));
    else if (argc > 1)
      die(_("fetch --all does not make sense with refspecs"));

    (void) for_each_remote(get_one_remote_for_fetch, &list);

    /* do not do fetch_multiple() of one */
    if (list.nr == 1)
      remote = remote_get(list.items[0].string);
  } else if (argc == 0) {
    /* No arguments -- use default remote */
    remote = remote_get(NULL);
  } else if (multiple) {
    /* All arguments are assumed to be remotes or groups */
    for (i = 0; i < argc; i++)
      if (!add_remote_or_group(argv[i], &list))
        die(_("no such remote or remote group: %s"),
            argv[i]);
  } else {
    /* Single remote or group */
    (void) add_remote_or_group(argv[0], &list);
    if (list.nr > 1) {
      /* More than one remote */
      if (argc > 1)
        die(_("fetching a group and specifying refspecs does not make sense"));
    } else {
      /* Zero or one remotes */
      remote = remote_get(argv[0]);
      prune_tags_ok = (argc == 1);
      argc--;
      argv++;
    }
  }
  string_list_remove_duplicates(&list, 0);

  if (negotiate_only) {
    struct oidset acked_commits = OIDSET_INIT;
    struct oidset_iter iter;
    const struct object_id *oid;

    trace2_region_enter("fetch", "negotiate-only", the_repository);
    if (!remote)
      die(_("must supply remote when using --negotiate-only"));
    gtransport = prepare_transport(remote, 1);
    if (gtransport->smart_options) {
      gtransport->smart_options->acked_commits = &acked_commits;
    } else {
      warning(_("protocol does not support --negotiate-only, exiting"));
      result = 1;
      trace2_region_leave("fetch", "negotiate-only", the_repository);
      goto cleanup;
    }
    if (server_options.nr)
      gtransport->server_options = &server_options;
    result = transport_fetch_refs(gtransport, NULL);

    oidset_iter_init(&acked_commits, &iter);
    while ((oid = oidset_iter_next(&iter)))
      printf("%s\n", oid_to_hex(oid));
    oidset_clear(&acked_commits);
    trace2_region_leave("fetch", "negotiate-only", the_repository);
  } else if (remote) {
    if (filter_options.choice || repo_has_promisor_remote(the_repository)) {
      trace2_region_enter("fetch", "setup-partial", the_repository);
      fetch_one_setup_partial(remote);
      trace2_region_leave("fetch", "setup-partial", the_repository);
    }
    trace2_region_enter("fetch", "fetch-one", the_repository);
    result = fetch_one(remote, argc, argv, prune_tags_ok, stdin_refspecs,
           &config);
    trace2_region_leave("fetch", "fetch-one", the_repository);
  } else {
    int max_children = max_jobs;

    if (filter_options.choice)
      die(_("--filter can only be used with the remote "
            "configured in extensions.partialclone"));

    if (atomic_fetch)
      die(_("--atomic can only be used when fetching "
            "from one remote"));

    if (stdin_refspecs)
      die(_("--stdin can only be used when fetching "
            "from one remote"));

    if (max_children < 0)
      max_children = config.parallel;

    /* TODO should this also die if we have a previous partial-clone? */
    trace2_region_enter("fetch", "fetch-multiple", the_repository);
    result = fetch_multiple(&list, max_children, &config);
    trace2_region_leave("fetch", "fetch-multiple", the_repository);
  }

  /*
   * This is only needed after fetch_one(), which does not fetch
   * submodules by itself.
   *
   * When we fetch from multiple remotes, fetch_multiple() has
   * already updated submodules to grab commits necessary for
   * the fetched history from each remote, so there is no need
   * to fetch submodules from here.
   */
  if (!result && remote && (config.recurse_submodules != RECURSE_SUBMODULES_OFF)) {
    struct strvec options = STRVEC_INIT;
    int max_children = max_jobs;

    if (max_children < 0)
      max_children = config.submodule_fetch_jobs;
    if (max_children < 0)
      max_children = config.parallel;

    add_options_to_argv(&options, &config);
    trace2_region_enter_printf("fetch", "recurse-submodule", the_repository, "%s", submodule_prefix);
    result = fetch_submodules(the_repository,
            &options,
            submodule_prefix,
            config.recurse_submodules,
            recurse_submodules_default,
            verbosity < 0,
            max_children);
    trace2_region_leave_printf("fetch", "recurse-submodule", the_repository, "%s", submodule_prefix);
    strvec_clear(&options);
  }

  /*
   * Skip irrelevant tasks because we know objects were not
   * fetched.
   *
   * NEEDSWORK: as a future optimization, we can return early
   * whenever objects were not fetched e.g. if we already have all
   * of them.
   */
  if (negotiate_only)
    goto cleanup;

  prepare_repo_settings(the_repository);
  if (fetch_write_commit_graph > 0 ||
      (fetch_write_commit_graph < 0 &&
       the_repository->settings.fetch_write_commit_graph)) {
    int commit_graph_flags = COMMIT_GRAPH_WRITE_SPLIT;

    if (progress)
      commit_graph_flags |= COMMIT_GRAPH_WRITE_PROGRESS;

    trace2_region_enter("fetch", "write-commit-graph", the_repository);
    write_commit_graph_reachable(the_repository->objects->odb,
               commit_graph_flags,
               NULL);
    trace2_region_leave("fetch", "write-commit-graph", the_repository);
  }

  if (enable_auto_gc) {
    if (refetch) {
      /*
       * Hint auto-maintenance strongly to encourage repacking,
       * but respect config settings disabling it.
       */
      int opt_val;
      if (git_config_get_int("gc.autopacklimit", &opt_val))
        opt_val = -1;
      if (opt_val != 0)
        git_config_push_parameter("gc.autoPackLimit=1");

      if (git_config_get_int("maintenance.incremental-repack.auto", &opt_val))
        opt_val = -1;
      if (opt_val != 0)
        git_config_push_parameter("maintenance.incremental-repack.auto=-1");
    }
    run_auto_maintenance(verbosity < 0);
  }

 cleanup:
  string_list_clear(&list, 0);
  return result;
}

Coverage Report

Created: 2024-09-08 06:24