connected.c

   1 #include "cache.h"
   2 #include "object-store.h"
   3 #include "run-command.h"
   4 #include "sigchain.h"
   5 #include "connected.h"
   6 #include "transport.h"
   7 #include "packfile.h"
   8
   9 /*
  10  * If we feed all the commits we want to verify to this command
  11  *
  12  *  $ git rev-list --objects --stdin --not --all
  13  *
  14  * and if it does not error out, that means everything reachable from
  15  * these commits locally exists and is connected to our existing refs.
  16  * Note that this does _not_ validate the individual objects.
  17  *
  18  * Returns 0 if everything is connected, non-zero otherwise.
  19  */
  20 int check_connected(oid_iterate_fn fn, void *cb_data,
  21                     struct check_connected_options *opt)
  22 {
  23         struct child_process rev_list = CHILD_PROCESS_INIT;
  24         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
  25         char commit[GIT_MAX_HEXSZ + 1];
  26         struct object_id oid;
  27         int err = 0;
  28         struct packed_git *new_pack = NULL;
  29         struct transport *transport;
  30         size_t base_len;
  31
  32         if (!opt)
  33                 opt = &defaults;
  34         transport = opt->transport;
  35
  36         if (fn(cb_data, &oid)) {
  37                 if (opt->err_fd)
  38                         close(opt->err_fd);
  39                 return err;
  40         }
  41
  42         if (transport && transport->smart_options &&
  43             transport->smart_options->self_contained_and_connected &&
  44             transport->pack_lockfile &&
  45             strip_suffix(transport->pack_lockfile, ".keep", &base_len)) {
  46                 struct strbuf idx_file = STRBUF_INIT;
  47                 strbuf_add(&idx_file, transport->pack_lockfile, base_len);
  48                 strbuf_addstr(&idx_file, ".idx");
  49                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  50                 strbuf_release(&idx_file);
  51         }
  52
  53         if (opt->check_refs_only) {
  54                 /*
  55                  * For partial clones, we don't want to have to do a regular
  56                  * connectivity check because we have to enumerate and exclude
  57                  * all promisor objects (slow), and then the connectivity check
  58                  * itself becomes a no-op because in a partial clone every
  59                  * object is a promisor object. Instead, just make sure we
  60                  * received the objects pointed to by each wanted ref.
  61                  */
  62                 do {
  63                         if (!repo_has_object_file(the_repository, &oid))
  64                                 return 1;
  65                 } while (!fn(cb_data, &oid));
  66                 return 0;
  67         }
  68
  69         if (opt->shallow_file) {
  70                 argv_array_push(&rev_list.args, "--shallow-file");
  71                 argv_array_push(&rev_list.args, opt->shallow_file);
  72         }
  73         argv_array_push(&rev_list.args,"rev-list");
  74         argv_array_push(&rev_list.args, "--objects");
  75         argv_array_push(&rev_list.args, "--stdin");
  76         if (repository_format_partial_clone)
  77                 argv_array_push(&rev_list.args, "--exclude-promisor-objects");
  78         if (!opt->is_deepening_fetch) {
  79                 argv_array_push(&rev_list.args, "--not");
  80                 argv_array_push(&rev_list.args, "--all");
  81         }
  82         argv_array_push(&rev_list.args, "--quiet");
  83         argv_array_push(&rev_list.args, "--alternate-refs");
  84         if (opt->progress)
  85                 argv_array_pushf(&rev_list.args, "--progress=%s",
  86                                  _("Checking connectivity"));
  87
  88         rev_list.git_cmd = 1;
  89         rev_list.env = opt->env;
  90         rev_list.in = -1;
  91         rev_list.no_stdout = 1;
  92         if (opt->err_fd)
  93                 rev_list.err = opt->err_fd;
  94         else
  95                 rev_list.no_stderr = opt->quiet;
  96
  97         if (start_command(&rev_list))
  98                 return error(_("Could not run 'git rev-list'"));
  99
 100         sigchain_push(SIGPIPE, SIG_IGN);
 101
 102         commit[GIT_SHA1_HEXSZ] = '\n';
 103         do {
 104                 /*
 105                  * If index-pack already checked that:
 106                  * - there are no dangling pointers in the new pack
 107                  * - the pack is self contained
 108                  * Then if the updated ref is in the new pack, then we
 109                  * are sure the ref is good and not sending it to
 110                  * rev-list for verification.
 111                  */
 112                 if (new_pack && find_pack_entry_one(oid.hash, new_pack))
 113                         continue;
 114
 115                 memcpy(commit, oid_to_hex(&oid), GIT_SHA1_HEXSZ);
 116                 if (write_in_full(rev_list.in, commit, GIT_SHA1_HEXSZ + 1) < 0) {
 117                         if (errno != EPIPE && errno != EINVAL)
 118                                 error_errno(_("failed write to rev-list"));
 119                         err = -1;
 120                         break;
 121                 }
 122         } while (!fn(cb_data, &oid));
 123
 124         if (close(rev_list.in))
 125                 err = error_errno(_("failed to close rev-list's stdin"));
 126
 127         sigchain_pop(SIGPIPE);
 128         return finish_command(&rev_list) || err;
 129 }