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                 if (opt->err_fd)
  36                         close(opt->err_fd);
  37                 return err;
  38         }
  39
  40         if (transport && transport->smart_options &&
  41             transport->smart_options->self_contained_and_connected &&
  42             transport->pack_lockfile &&
  43             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
  44                 struct strbuf idx_file = STRBUF_INIT;
  45                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
  46                 strbuf_addstr(&idx_file, ".idx");
  47                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  48                 strbuf_release(&idx_file);
  49         }
  50
  51         if (opt->shallow_file) {
  52                 argv_array_push(&rev_list.args, "--shallow-file");
  53                 argv_array_push(&rev_list.args, opt->shallow_file);
  54         }
  55         argv_array_push(&rev_list.args,"rev-list");
  56         argv_array_push(&rev_list.args, "--objects");
  57         argv_array_push(&rev_list.args, "--stdin");
  58         argv_array_push(&rev_list.args, "--not");
  59         argv_array_push(&rev_list.args, "--all");
  60         argv_array_push(&rev_list.args, "--quiet");
  61         if (opt->progress)
  62                 argv_array_pushf(&rev_list.args, "--progress=%s",
  63                                  _("Checking connectivity"));
  64
  65         rev_list.git_cmd = 1;
  66         rev_list.env = opt->env;
  67         rev_list.in = -1;
  68         rev_list.no_stdout = 1;
  69         if (opt->err_fd)
  70                 rev_list.err = opt->err_fd;
  71         else
  72                 rev_list.no_stderr = opt->quiet;
  73
  74         if (start_command(&rev_list))
  75                 return error(_("Could not run 'git rev-list'"));
  76
  77         sigchain_push(SIGPIPE, SIG_IGN);
  78
  79         commit[40] = '\n';
  80         do {
  81                 /*
  82                  * If index-pack already checked that:
  83                  * - there are no dangling pointers in the new pack
  84                  * - the pack is self contained
  85                  * Then if the updated ref is in the new pack, then we
  86                  * are sure the ref is good and not sending it to
  87                  * rev-list for verification.
  88                  */
  89                 if (new_pack && find_pack_entry_one(sha1, new_pack))
  90                         continue;
  91
  92                 memcpy(commit, sha1_to_hex(sha1), 40);
  93                 if (write_in_full(rev_list.in, commit, 41) < 0) {
  94                         if (errno != EPIPE && errno != EINVAL)
  95                                 error_errno(_("failed write to rev-list"));
  96                         err = -1;
  97                         break;
  98                 }
  99         } while (!fn(cb_data, sha1));
 100
 101         if (close(rev_list.in))
 102                 err = error_errno(_("failed to close rev-list's stdin"));
 103
 104         sigchain_pop(SIGPIPE);
 105         return finish_command(&rev_list) || err;
 106 }