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