connected.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "sigchain.h"
   4 #include "connected.h"
   5
   6 /*
   7  * If we feed all the commits we want to verify to this command
   8  *
   9  *  $ git rev-list --objects --stdin --not --all
  10  *
  11  * and if it does not error out, that means everything reachable from
  12  * these commits locally exists and is connected to our existing refs.
  13  * Note that this does _not_ validate the individual objects.
  14  *
  15  * Returns 0 if everything is connected, non-zero otherwise.
  16  */
  17 int check_everything_connected(sha1_iterate_fn fn, int quiet, void *cb_data)
  18 {
  19         struct child_process rev_list;
  20         const char *argv[] = {"rev-list", "--objects",
  21                               "--stdin", "--not", "--all", NULL, NULL};
  22         char commit[41];
  23         unsigned char sha1[20];
  24         int err = 0;
  25
  26         if (fn(cb_data, sha1))
  27                 return err;
  28
  29         if (quiet)
  30                 argv[5] = "--quiet";
  31
  32         memset(&rev_list, 0, sizeof(rev_list));
  33         rev_list.argv = argv;
  34         rev_list.git_cmd = 1;
  35         rev_list.in = -1;
  36         rev_list.no_stdout = 1;
  37         rev_list.no_stderr = quiet;
  38         if (start_command(&rev_list))
  39                 return error(_("Could not run 'git rev-list'"));
  40
  41         sigchain_push(SIGPIPE, SIG_IGN);
  42
  43         commit[40] = '\n';
  44         do {
  45                 memcpy(commit, sha1_to_hex(sha1), 40);
  46                 if (write_in_full(rev_list.in, commit, 41) < 0) {
  47                         if (errno != EPIPE && errno != EINVAL)
  48                                 error(_("failed write to rev-list: %s"),
  49                                       strerror(errno));
  50                         err = -1;
  51                         break;
  52                 }
  53         } while (!fn(cb_data, sha1));
  54
  55         if (close(rev_list.in)) {
  56                 error(_("failed to close rev-list's stdin: %s"), strerror(errno));
  57                 err = -1;
  58         }
  59
  60         sigchain_pop(SIGPIPE);
  61         return finish_command(&rev_list) || err;
  62 }