connected.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "sigchain.h"
   4 #include "connected.h"
   5 #include "transport.h"
   6 #include "packfile.h"
   7
   8 /*
   9  * If we feed all the commits we want to verify to this command
  10  *
  11  *  $ git rev-list --objects --stdin --not --all
  12  *
  13  * and if it does not error out, that means everything reachable from
  14  * these commits locally exists and is connected to our existing refs.
  15  * Note that this does _not_ validate the individual objects.
  16  *
  17  * Returns 0 if everything is connected, non-zero otherwise.
  18  */
  19 int check_connected(oid_iterate_fn fn, void *cb_data,
  20                     struct check_connected_options *opt)
  21 {
  22         struct child_process rev_list = CHILD_PROCESS_INIT;
  23         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
  24         char commit[GIT_MAX_HEXSZ + 1];
  25         struct object_id oid;
  26         int err = 0;
  27         struct packed_git *new_pack = NULL;
  28         struct transport *transport;
  29         size_t base_len;
  30
  31         if (!opt)
  32                 opt = &defaults;
  33         transport = opt->transport;
  34
  35         if (fn(cb_data, &oid)) {
  36                 if (opt->err_fd)
  37                         close(opt->err_fd);
  38                 return err;
  39         }
  40
  41         if (transport && transport->smart_options &&
  42             transport->smart_options->self_contained_and_connected &&
  43             transport->pack_lockfile &&
  44             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
  45                 struct strbuf idx_file = STRBUF_INIT;
  46                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
  47                 strbuf_addstr(&idx_file, ".idx");
  48                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  49                 strbuf_release(&idx_file);
  50         }
  51
  52         if (opt->shallow_file) {
  53                 argv_array_push(&rev_list.args, "--shallow-file");
  54                 argv_array_push(&rev_list.args, opt->shallow_file);
  55         }
  56         argv_array_push(&rev_list.args,"rev-list");
  57         argv_array_push(&rev_list.args, "--objects");
  58         argv_array_push(&rev_list.args, "--stdin");
  59         argv_array_push(&rev_list.args, "--not");
  60         argv_array_push(&rev_list.args, "--all");
  61         argv_array_push(&rev_list.args, "--quiet");
  62         if (opt->progress)
  63                 argv_array_pushf(&rev_list.args, "--progress=%s",
  64                                  _("Checking connectivity"));
  65
  66         rev_list.git_cmd = 1;
  67         rev_list.env = opt->env;
  68         rev_list.in = -1;
  69         rev_list.no_stdout = 1;
  70         if (opt->err_fd)
  71                 rev_list.err = opt->err_fd;
  72         else
  73                 rev_list.no_stderr = opt->quiet;
  74
  75         if (start_command(&rev_list))
  76                 return error(_("Could not run 'git rev-list'"));
  77
  78         sigchain_push(SIGPIPE, SIG_IGN);
  79
  80         commit[GIT_SHA1_HEXSZ] = '\n';
  81         do {
  82                 /*
  83                  * If index-pack already checked that:
  84                  * - there are no dangling pointers in the new pack
  85                  * - the pack is self contained
  86                  * Then if the updated ref is in the new pack, then we
  87                  * are sure the ref is good and not sending it to
  88                  * rev-list for verification.
  89                  */
  90                 if (new_pack && find_pack_entry_one(oid.hash, new_pack))
  91                         continue;
  92
  93                 memcpy(commit, oid_to_hex(&oid), GIT_SHA1_HEXSZ);
  94                 if (write_in_full(rev_list.in, commit, GIT_SHA1_HEXSZ + 1) < 0) {
  95                         if (errno != EPIPE && errno != EINVAL)
  96                                 error_errno(_("failed write to rev-list"));
  97                         err = -1;
  98                         break;
  99                 }
 100         } while (!fn(cb_data, &oid));
 101
 102         if (close(rev_list.in))
 103                 err = error_errno(_("failed to close rev-list's stdin"));
 104
 105         sigchain_pop(SIGPIPE);
 106         return finish_command(&rev_list) || err;
 107 }