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 static int check_everything_connected_real(sha1_iterate_fn fn,
  23                                            int quiet,
  24                                            void *cb_data,
  25                                            struct transport *transport,
  26                                            const char *shallow_file)
  27 {
  28         struct child_process rev_list;
  29         const char *argv[9];
  30         char commit[41];
  31         unsigned char sha1[20];
  32         int err = 0, ac = 0;
  33         struct packed_git *new_pack = NULL;
  34         size_t base_len;
  35
  36         if (fn(cb_data, sha1))
  37                 return err;
  38
  39         if (transport && transport->smart_options &&
  40             transport->smart_options->self_contained_and_connected &&
  41             transport->pack_lockfile &&
  42             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
  43                 struct strbuf idx_file = STRBUF_INIT;
  44                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
  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 (shallow_file) {
  51                 argv[ac++] = "--shallow-file";
  52                 argv[ac++] = shallow_file;
  53         }
  54         argv[ac++] = "rev-list";
  55         argv[ac++] = "--objects";
  56         argv[ac++] = "--stdin";
  57         argv[ac++] = "--not";
  58         argv[ac++] = "--all";
  59         if (quiet)
  60                 argv[ac++] = "--quiet";
  61         argv[ac] = NULL;
  62
  63         memset(&rev_list, 0, sizeof(rev_list));
  64         rev_list.argv = argv;
  65         rev_list.git_cmd = 1;
  66         rev_list.in = -1;
  67         rev_list.no_stdout = 1;
  68         rev_list.no_stderr = quiet;
  69         if (start_command(&rev_list))
  70                 return error(_("Could not run 'git rev-list'"));
  71
  72         sigchain_push(SIGPIPE, SIG_IGN);
  73
  74         commit[40] = '\n';
  75         do {
  76                 /*
  77                  * If index-pack already checked that:
  78                  * - there are no dangling pointers in the new pack
  79                  * - the pack is self contained
  80                  * Then if the updated ref is in the new pack, then we
  81                  * are sure the ref is good and not sending it to
  82                  * rev-list for verification.
  83                  */
  84                 if (new_pack && find_pack_entry_one(sha1, new_pack))
  85                         continue;
  86
  87                 memcpy(commit, sha1_to_hex(sha1), 40);
  88                 if (write_in_full(rev_list.in, commit, 41) < 0) {
  89                         if (errno != EPIPE && errno != EINVAL)
  90                                 error(_("failed write to rev-list: %s"),
  91                                       strerror(errno));
  92                         err = -1;
  93                         break;
  94                 }
  95         } while (!fn(cb_data, sha1));
  96
  97         if (close(rev_list.in)) {
  98                 error(_("failed to close rev-list's stdin: %s"), strerror(errno));
  99                 err = -1;
 100         }
 101
 102         sigchain_pop(SIGPIPE);
 103         return finish_command(&rev_list) || err;
 104 }
 105
 106 int check_everything_connected_with_transport(sha1_iterate_fn fn,
 107                                               int quiet,
 108                                               void *cb_data,
 109                                               struct transport *transport)
 110 {
 111         return check_everything_connected_real(fn, quiet, cb_data,
 112                                                transport, NULL);
 113 }
 114
 115 int check_shallow_connected(sha1_iterate_fn fn, int quiet, void *cb_data,
 116                             const char *shallow_file)
 117 {
 118         return check_everything_connected_real(fn, quiet, cb_data,
 119                                                NULL, shallow_file);
 120 }