connected.c

   1 #include "cache.h"
   2 #include "object-store.h"
   3 #include "run-command.h"
   4 #include "sigchain.h"
   5 #include "connected.h"
   6 #include "transport.h"
   7 #include "packfile.h"
   8 #include "promisor-remote.h"
   9
  10 /*
  11  * If we feed all the commits we want to verify to this command
  12  *
  13  *  $ git rev-list --objects --stdin --not --all
  14  *
  15  * and if it does not error out, that means everything reachable from
  16  * these commits locally exists and is connected to our existing refs.
  17  * Note that this does _not_ validate the individual objects.
  18  *
  19  * Returns 0 if everything is connected, non-zero otherwise.
  20  */
  21 int check_connected(oid_iterate_fn fn, void *cb_data,
  22                     struct check_connected_options *opt)
  23 {
  24         struct child_process rev_list = CHILD_PROCESS_INIT;
  25         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
  26         char commit[GIT_MAX_HEXSZ + 1];
  27         struct object_id oid;
  28         int err = 0;
  29         struct packed_git *new_pack = NULL;
  30         struct transport *transport;
  31         size_t base_len;
  32         const unsigned hexsz = the_hash_algo->hexsz;
  33
  34         if (!opt)
  35                 opt = &defaults;
  36         transport = opt->transport;
  37
  38         if (fn(cb_data, &oid)) {
  39                 if (opt->err_fd)
  40                         close(opt->err_fd);
  41                 return err;
  42         }
  43
  44         if (transport && transport->smart_options &&
  45             transport->smart_options->self_contained_and_connected &&
  46             transport->pack_lockfile &&
  47             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
  48                 struct strbuf idx_file = STRBUF_INIT;
  49                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
  50                 strbuf_addstr(&idx_file, ".idx");
  51                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  52                 strbuf_release(&idx_file);
  53         }
  54
  55         if (has_promisor_remote()) {
  56                 /*
  57                  * For partial clones, we don't want to have to do a regular
  58                  * connectivity check because we have to enumerate and exclude
  59                  * all promisor objects (slow), and then the connectivity check
  60                  * itself becomes a no-op because in a partial clone every
  61                  * object is a promisor object. Instead, just make sure we
  62                  * received, in a promisor packfile, the objects pointed to by
  63                  * each wanted ref.
  64                  *
  65                  * Before checking for promisor packs, be sure we have the
  66                  * latest pack-files loaded into memory.
  67                  */
  68                 reprepare_packed_git(the_repository);
  69                 do {
  70                         struct packed_git *p;
  71
  72                         for (p = get_all_packs(the_repository); p; p = p->next) {
  73                                 if (!p->pack_promisor)
  74                                         continue;
  75                                 if (find_pack_entry_one(oid.hash, p))
  76                                         goto promisor_pack_found;
  77                         }
  78                         /*
  79                          * Fallback to rev-list with oid and the rest of the
  80                          * object IDs provided by fn.
  81                          */
  82                         goto no_promisor_pack_found;
  83 promisor_pack_found:
  84                         ;
  85                 } while (!fn(cb_data, &oid));
  86                 return 0;
  87         }
  88
  89 no_promisor_pack_found:
  90         if (opt->shallow_file) {
  91                 argv_array_push(&rev_list.args, "--shallow-file");
  92                 argv_array_push(&rev_list.args, opt->shallow_file);
  93         }
  94         argv_array_push(&rev_list.args,"rev-list");
  95         argv_array_push(&rev_list.args, "--objects");
  96         argv_array_push(&rev_list.args, "--stdin");
  97         if (has_promisor_remote())
  98                 argv_array_push(&rev_list.args, "--exclude-promisor-objects");
  99         if (!opt->is_deepening_fetch) {
 100                 argv_array_push(&rev_list.args, "--not");
 101                 argv_array_push(&rev_list.args, "--all");
 102         }
 103         argv_array_push(&rev_list.args, "--quiet");
 104         argv_array_push(&rev_list.args, "--alternate-refs");
 105         if (opt->progress)
 106                 argv_array_pushf(&rev_list.args, "--progress=%s",
 107                                  _("Checking connectivity"));
 108
 109         rev_list.git_cmd = 1;
 110         rev_list.env = opt->env;
 111         rev_list.in = -1;
 112         rev_list.no_stdout = 1;
 113         if (opt->err_fd)
 114                 rev_list.err = opt->err_fd;
 115         else
 116                 rev_list.no_stderr = opt->quiet;
 117
 118         if (start_command(&rev_list))
 119                 return error(_("Could not run 'git rev-list'"));
 120
 121         sigchain_push(SIGPIPE, SIG_IGN);
 122
 123         commit[hexsz] = '\n';
 124         do {
 125                 /*
 126                  * If index-pack already checked that:
 127                  * - there are no dangling pointers in the new pack
 128                  * - the pack is self contained
 129                  * Then if the updated ref is in the new pack, then we
 130                  * are sure the ref is good and not sending it to
 131                  * rev-list for verification.
 132                  */
 133                 if (new_pack && find_pack_entry_one(oid.hash, new_pack))
 134                         continue;
 135
 136                 memcpy(commit, oid_to_hex(&oid), hexsz);
 137                 if (write_in_full(rev_list.in, commit, hexsz + 1) < 0) {
 138                         if (errno != EPIPE && errno != EINVAL)
 139                                 error_errno(_("failed write to rev-list"));
 140                         err = -1;
 141                         break;
 142                 }
 143         } while (!fn(cb_data, &oid));
 144
 145         if (close(rev_list.in))
 146                 err = error_errno(_("failed to close rev-list's stdin"));
 147
 148         sigchain_pop(SIGPIPE);
 149         return finish_command(&rev_list) || err;
 150 }