connected.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "sigchain.h"
   4 #include "connected.h"
   5 #include "transport.h"
   6
   7 /*
   8  * If we feed all the commits we want to verify to this command
   9  *
  10  *  $ git rev-list --objects --stdin --not --all
  11  *
  12  * and if it does not error out, that means everything reachable from
  13  * these commits locally exists and is connected to our existing refs.
  14  * Note that this does _not_ validate the individual objects.
  15  *
  16  * Returns 0 if everything is connected, non-zero otherwise.
  17  */
  18 int check_connected(sha1_iterate_fn fn, void *cb_data,
  19                     struct check_connected_options *opt)
  20 {
  21         struct child_process rev_list = CHILD_PROCESS_INIT;
  22         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
  23         char commit[41];
  24         unsigned char sha1[20];
  25         int err = 0;
  26         struct packed_git *new_pack = NULL;
  27         struct transport *transport;
  28         size_t base_len;
  29
  30         if (!opt)
  31                 opt = &defaults;
  32         transport = opt->transport;
  33
  34         if (fn(cb_data, sha1))
  35                 return err;
  36
  37         if (transport && transport->smart_options &&
  38             transport->smart_options->self_contained_and_connected &&
  39             transport->pack_lockfile &&
  40             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
  41                 struct strbuf idx_file = STRBUF_INIT;
  42                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
  43                 strbuf_addstr(&idx_file, ".idx");
  44                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  45                 strbuf_release(&idx_file);
  46         }
  47
  48         if (opt->shallow_file) {
  49                 argv_array_push(&rev_list.args, "--shallow-file");
  50                 argv_array_push(&rev_list.args, opt->shallow_file);
  51         }
  52         argv_array_push(&rev_list.args,"rev-list");
  53         argv_array_push(&rev_list.args, "--objects");
  54         argv_array_push(&rev_list.args, "--stdin");
  55         argv_array_push(&rev_list.args, "--not");
  56         argv_array_push(&rev_list.args, "--all");
  57         argv_array_push(&rev_list.args, "--quiet");
  58
  59         rev_list.git_cmd = 1;
  60         rev_list.in = -1;
  61         rev_list.no_stdout = 1;
  62         rev_list.no_stderr = opt->quiet;
  63         if (start_command(&rev_list))
  64                 return error(_("Could not run 'git rev-list'"));
  65
  66         sigchain_push(SIGPIPE, SIG_IGN);
  67
  68         commit[40] = '\n';
  69         do {
  70                 /*
  71                  * If index-pack already checked that:
  72                  * - there are no dangling pointers in the new pack
  73                  * - the pack is self contained
  74                  * Then if the updated ref is in the new pack, then we
  75                  * are sure the ref is good and not sending it to
  76                  * rev-list for verification.
  77                  */
  78                 if (new_pack && find_pack_entry_one(sha1, new_pack))
  79                         continue;
  80
  81                 memcpy(commit, sha1_to_hex(sha1), 40);
  82                 if (write_in_full(rev_list.in, commit, 41) < 0) {
  83                         if (errno != EPIPE && errno != EINVAL)
  84                                 error_errno(_("failed write to rev-list"));
  85                         err = -1;
  86                         break;
  87                 }
  88         } while (!fn(cb_data, sha1));
  89
  90         if (close(rev_list.in))
  91                 err = error_errno(_("failed to close rev-list's stdin"));
  92
  93         sigchain_pop(SIGPIPE);
  94         return finish_command(&rev_list) || err;
  95 }