#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "gettext.h"

#include "hex.h"

#include "odb.h"

#include "run-command.h"

#include "sigchain.h"

#include "connected.h"

#include "transport.h"

#include "packfile.h"

#include "promisor-remote.h"

/*

 * If we feed all the commits we want to verify to this command

 *

 *  $ git rev-list --objects --stdin --not --all

 *

 * and if it does not error out, that means everything reachable from

 * these commits locally exists and is connected to our existing refs.

 * Note that this does _not_ validate the individual objects.

 *

 * Returns 0 if everything is connected, non-zero otherwise.

 */

int check_connected(oid_iterate_fn fn, void *cb_data,

        struct check_connected_options *opt)

{

  struct child_process rev_list = CHILD_PROCESS_INIT;

  FILE *rev_list_in;

  struct check_connected_options defaults = CHECK_CONNECTED_INIT;

  const struct object_id *oid;

  int err = 0;

  struct packed_git *new_pack = NULL;

  struct transport *transport;

  size_t base_len;

  if (!opt)

    opt = &defaults;

  transport = opt->transport;

  oid = fn(cb_data);

  if (!oid) {

    if (opt->err_fd)

      close(opt->err_fd);

    return err;

  }

  if (repo_has_promisor_remote(the_repository)) {

    /*

     * For partial clones, we don't want to have to do a regular

     * connectivity check because we have to enumerate and exclude

     * all promisor objects (slow), and then the connectivity check

     * itself becomes a no-op because in a partial clone every

     * object is a promisor object. Instead, just make sure we

     * received, in a promisor packfile, the objects pointed to by

     * each wanted ref.

     *

     * Before checking for promisor packs, be sure we have the

     * latest pack-files loaded into memory.

     */

    odb_reprepare(the_repository->objects);

    do {

      struct packed_git *p;

      repo_for_each_pack(the_repository, p) {

        if (!p->pack_promisor)

          continue;

        if (find_pack_entry_one(oid, p))

          goto promisor_pack_found;

      }

      /*

       * Fallback to rev-list with oid and the rest of the

       * object IDs provided by fn.

       */

      goto no_promisor_pack_found;

promisor_pack_found:

      ;

    } while ((oid = fn(cb_data)) != NULL);

    return 0;

  }

no_promisor_pack_found:

  if (opt->shallow_file) {

    strvec_push(&rev_list.args, "--shallow-file");

    strvec_push(&rev_list.args, opt->shallow_file);

  }

  strvec_push(&rev_list.args,"rev-list");

  strvec_push(&rev_list.args, "--objects");

  strvec_push(&rev_list.args, "--stdin");

  if (repo_has_promisor_remote(the_repository))

    strvec_push(&rev_list.args, "--exclude-promisor-objects");

  if (!opt->is_deepening_fetch) {

    strvec_push(&rev_list.args, "--not");

    if (opt->exclude_hidden_refs_section)

      strvec_pushf(&rev_list.args, "--exclude-hidden=%s",

             opt->exclude_hidden_refs_section);

    strvec_push(&rev_list.args, "--all");

  }

  strvec_push(&rev_list.args, "--quiet");

  strvec_push(&rev_list.args, "--alternate-refs");

  if (opt->progress)

    strvec_pushf(&rev_list.args, "--progress=%s",

           _("Checking connectivity"));

  rev_list.git_cmd = 1;

  if (opt->env)

    strvec_pushv(&rev_list.env, opt->env);

  rev_list.in = -1;

  rev_list.no_stdout = 1;

  if (opt->err_fd)

    rev_list.err = opt->err_fd;

  else

    rev_list.no_stderr = opt->quiet;

  if (start_command(&rev_list))

    return error(_("Could not run 'git rev-list'"));

  sigchain_push(SIGPIPE, SIG_IGN);

  rev_list_in = xfdopen(rev_list.in, "w");

  if (transport && transport->smart_options &&

      transport->smart_options->self_contained_and_connected &&

      transport->pack_lockfiles.nr == 1 &&

      strip_suffix(transport->pack_lockfiles.items[0].string,

       ".keep", &base_len)) {

    struct strbuf idx_file = STRBUF_INIT;

    strbuf_add(&idx_file, transport->pack_lockfiles.items[0].string,

         base_len);

    strbuf_addstr(&idx_file, ".idx");

    new_pack = add_packed_git(the_repository, idx_file.buf,

            idx_file.len, 1);

    strbuf_release(&idx_file);

  }

  do {

    /*

     * If index-pack already checked that:

     * - there are no dangling pointers in the new pack

     * - the pack is self contained

     * Then if the updated ref is in the new pack, then we

     * are sure the ref is good and not sending it to

     * rev-list for verification.

     */

    if (new_pack && find_pack_entry_one(oid, new_pack))

      continue;

    if (fprintf(rev_list_in, "%s\n", oid_to_hex(oid)) < 0)

      break;

  } while ((oid = fn(cb_data)) != NULL);

  if (ferror(rev_list_in) || fflush(rev_list_in)) {

    if (errno != EPIPE && errno != EINVAL)

      error_errno(_("failed write to rev-list"));

    err = -1;

  }

  if (fclose(rev_list_in))

    err = error_errno(_("failed to close rev-list's stdin"));

  sigchain_pop(SIGPIPE);

  if (new_pack) {

    close_pack(new_pack);

    free(new_pack);

  }

  return finish_command(&rev_list) || err;

}