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 #include "promisor-remote.h"
   9
  10 /*
  11  * If we feed all the commits we want to verify to this command
  12  *
  13  *  $ git rev-list --objects --stdin --not --all
  14  *
  15  * and if it does not error out, that means everything reachable from
  16  * these commits locally exists and is connected to our existing refs.
  17  * Note that this does _not_ validate the individual objects.
  18  *
  19  * Returns 0 if everything is connected, non-zero otherwise.
  20  */
  21 int check_connected(oid_iterate_fn fn, void *cb_data,
  22                     struct check_connected_options *opt)
  23 {
  24         struct child_process rev_list = CHILD_PROCESS_INIT;
  25         FILE *rev_list_in;
  26         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
  27         struct object_id oid;
  28         int err = 0;
  29         struct packed_git *new_pack = NULL;
  30         struct transport *transport;
  31         size_t base_len;
  32
  33         if (!opt)
  34                 opt = &defaults;
  35         transport = opt->transport;
  36
  37         if (fn(cb_data, &oid)) {
  38                 if (opt->err_fd)
  39                         close(opt->err_fd);
  40                 return err;
  41         }
  42
  43         if (transport && transport->smart_options &&
  44             transport->smart_options->self_contained_and_connected &&
  45             transport->pack_lockfiles.nr == 1 &&
  46             strip_suffix(transport->pack_lockfiles.items[0].string,
  47                          ".keep", &base_len)) {
  48                 struct strbuf idx_file = STRBUF_INIT;
  49                 strbuf_add(&idx_file, transport->pack_lockfiles.items[0].string,
  50                            base_len);
  51                 strbuf_addstr(&idx_file, ".idx");
  52                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  53                 strbuf_release(&idx_file);
  54         }
  55
  56         if (has_promisor_remote()) {
  57                 /*
  58                  * For partial clones, we don't want to have to do a regular
  59                  * connectivity check because we have to enumerate and exclude
  60                  * all promisor objects (slow), and then the connectivity check
  61                  * itself becomes a no-op because in a partial clone every
  62                  * object is a promisor object. Instead, just make sure we
  63                  * received, in a promisor packfile, the objects pointed to by
  64                  * each wanted ref.
  65                  *
  66                  * Before checking for promisor packs, be sure we have the
  67                  * latest pack-files loaded into memory.
  68                  */
  69                 reprepare_packed_git(the_repository);
  70                 do {
  71                         struct packed_git *p;
  72
  73                         for (p = get_all_packs(the_repository); p; p = p->next) {
  74                                 if (!p->pack_promisor)
  75                                         continue;
  76                                 if (find_pack_entry_one(oid.hash, p))
  77                                         goto promisor_pack_found;
  78                         }
  79                         /*
  80                          * Fallback to rev-list with oid and the rest of the
  81                          * object IDs provided by fn.
  82                          */
  83                         goto no_promisor_pack_found;
  84 promisor_pack_found:
  85                         ;
  86                 } while (!fn(cb_data, &oid));
  87                 return 0;
  88         }
  89
  90 no_promisor_pack_found:
  91         if (opt->shallow_file) {
  92                 strvec_push(&rev_list.args, "--shallow-file");
  93                 strvec_push(&rev_list.args, opt->shallow_file);
  94         }
  95         strvec_push(&rev_list.args,"rev-list");
  96         strvec_push(&rev_list.args, "--objects");
  97         strvec_push(&rev_list.args, "--stdin");
  98         if (has_promisor_remote())
  99                 strvec_push(&rev_list.args, "--exclude-promisor-objects");
 100         if (!opt->is_deepening_fetch) {
 101                 strvec_push(&rev_list.args, "--not");
 102                 strvec_push(&rev_list.args, "--all");
 103         }
 104         strvec_push(&rev_list.args, "--quiet");
 105         strvec_push(&rev_list.args, "--alternate-refs");
 106         if (opt->progress)
 107                 strvec_pushf(&rev_list.args, "--progress=%s",
 108                              _("Checking connectivity"));
 109
 110         rev_list.git_cmd = 1;
 111         rev_list.env = opt->env;
 112         rev_list.in = -1;
 113         rev_list.no_stdout = 1;
 114         if (opt->err_fd)
 115                 rev_list.err = opt->err_fd;
 116         else
 117                 rev_list.no_stderr = opt->quiet;
 118
 119         if (start_command(&rev_list))
 120                 return error(_("Could not run 'git rev-list'"));
 121
 122         sigchain_push(SIGPIPE, SIG_IGN);
 123
 124         rev_list_in = xfdopen(rev_list.in, "w");
 125
 126         do {
 127                 /*
 128                  * If index-pack already checked that:
 129                  * - there are no dangling pointers in the new pack
 130                  * - the pack is self contained
 131                  * Then if the updated ref is in the new pack, then we
 132                  * are sure the ref is good and not sending it to
 133                  * rev-list for verification.
 134                  */
 135                 if (new_pack && find_pack_entry_one(oid.hash, new_pack))
 136                         continue;
 137
 138                 if (fprintf(rev_list_in, "%s\n", oid_to_hex(&oid)) < 0)
 139                         break;
 140         } while (!fn(cb_data, &oid));
 141
 142         if (ferror(rev_list_in) || fflush(rev_list_in)) {
 143                 if (errno != EPIPE && errno != EINVAL)
 144                         error_errno(_("failed write to rev-list"));
 145                 err = -1;
 146         }
 147
 148         if (fclose(rev_list_in))
 149                 err = error_errno(_("failed to close rev-list's stdin"));
 150
 151         sigchain_pop(SIGPIPE);
 152         return finish_command(&rev_list) || err;
 153 }