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         const 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         oid = fn(cb_data);
  38         if (!oid) {
  39                 if (opt->err_fd)
  40                         close(opt->err_fd);
  41                 return err;
  42         }
  43
  44         if (transport && transport->smart_options &&
  45             transport->smart_options->self_contained_and_connected &&
  46             transport->pack_lockfiles.nr == 1 &&
  47             strip_suffix(transport->pack_lockfiles.items[0].string,
  48                          ".keep", &base_len)) {
  49                 struct strbuf idx_file = STRBUF_INIT;
  50                 strbuf_add(&idx_file, transport->pack_lockfiles.items[0].string,
  51                            base_len);
  52                 strbuf_addstr(&idx_file, ".idx");
  53                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  54                 strbuf_release(&idx_file);
  55         }
  56
  57         if (has_promisor_remote()) {
  58                 /*
  59                  * For partial clones, we don't want to have to do a regular
  60                  * connectivity check because we have to enumerate and exclude
  61                  * all promisor objects (slow), and then the connectivity check
  62                  * itself becomes a no-op because in a partial clone every
  63                  * object is a promisor object. Instead, just make sure we
  64                  * received, in a promisor packfile, the objects pointed to by
  65                  * each wanted ref.
  66                  *
  67                  * Before checking for promisor packs, be sure we have the
  68                  * latest pack-files loaded into memory.
  69                  */
  70                 reprepare_packed_git(the_repository);
  71                 do {
  72                         struct packed_git *p;
  73
  74                         for (p = get_all_packs(the_repository); p; p = p->next) {
  75                                 if (!p->pack_promisor)
  76                                         continue;
  77                                 if (find_pack_entry_one(oid->hash, p))
  78                                         goto promisor_pack_found;
  79                         }
  80                         /*
  81                          * Fallback to rev-list with oid and the rest of the
  82                          * object IDs provided by fn.
  83                          */
  84                         goto no_promisor_pack_found;
  85 promisor_pack_found:
  86                         ;
  87                 } while ((oid = fn(cb_data)) != NULL);
  88                 return 0;
  89         }
  90
  91 no_promisor_pack_found:
  92         if (opt->shallow_file) {
  93                 strvec_push(&rev_list.args, "--shallow-file");
  94                 strvec_push(&rev_list.args, opt->shallow_file);
  95         }
  96         strvec_push(&rev_list.args,"rev-list");
  97         strvec_push(&rev_list.args, "--objects");
  98         strvec_push(&rev_list.args, "--stdin");
  99         if (has_promisor_remote())
 100                 strvec_push(&rev_list.args, "--exclude-promisor-objects");
 101         if (!opt->is_deepening_fetch) {
 102                 strvec_push(&rev_list.args, "--not");
 103                 strvec_push(&rev_list.args, "--all");
 104         }
 105         strvec_push(&rev_list.args, "--quiet");
 106         strvec_push(&rev_list.args, "--alternate-refs");
 107         if (opt->progress)
 108                 strvec_pushf(&rev_list.args, "--progress=%s",
 109                              _("Checking connectivity"));
 110
 111         rev_list.git_cmd = 1;
 112         if (opt->env)
 113                 strvec_pushv(&rev_list.env_array, opt->env);
 114         rev_list.in = -1;
 115         rev_list.no_stdout = 1;
 116         if (opt->err_fd)
 117                 rev_list.err = opt->err_fd;
 118         else
 119                 rev_list.no_stderr = opt->quiet;
 120
 121         if (start_command(&rev_list))
 122                 return error(_("Could not run 'git rev-list'"));
 123
 124         sigchain_push(SIGPIPE, SIG_IGN);
 125
 126         rev_list_in = xfdopen(rev_list.in, "w");
 127
 128         do {
 129                 /*
 130                  * If index-pack already checked that:
 131                  * - there are no dangling pointers in the new pack
 132                  * - the pack is self contained
 133                  * Then if the updated ref is in the new pack, then we
 134                  * are sure the ref is good and not sending it to
 135                  * rev-list for verification.
 136                  */
 137                 if (new_pack && find_pack_entry_one(oid->hash, new_pack))
 138                         continue;
 139
 140                 if (fprintf(rev_list_in, "%s\n", oid_to_hex(oid)) < 0)
 141                         break;
 142         } while ((oid = fn(cb_data)) != NULL);
 143
 144         if (ferror(rev_list_in) || fflush(rev_list_in)) {
 145                 if (errno != EPIPE && errno != EINVAL)
 146                         error_errno(_("failed write to rev-list"));
 147                 err = -1;
 148         }
 149
 150         if (fclose(rev_list_in))
 151                 err = error_errno(_("failed to close rev-list's stdin"));
 152
 153         sigchain_pop(SIGPIPE);
 154         return finish_command(&rev_list) || err;
 155 }