connected.c

   1 #include "git-compat-util.h"
   2 #include "gettext.h"
   3 #include "hex.h"
   4 #include "object-store.h"
   5 #include "run-command.h"
   6 #include "sigchain.h"
   7 #include "connected.h"
   8 #include "transport.h"
   9 #include "packfile.h"
  10 #include "promisor-remote.h"
  11
  12 /*
  13  * If we feed all the commits we want to verify to this command
  14  *
  15  *  $ git rev-list --objects --stdin --not --all
  16  *
  17  * and if it does not error out, that means everything reachable from
  18  * these commits locally exists and is connected to our existing refs.
  19  * Note that this does _not_ validate the individual objects.
  20  *
  21  * Returns 0 if everything is connected, non-zero otherwise.
  22  */
  23 int check_connected(oid_iterate_fn fn, void *cb_data,
  24                     struct check_connected_options *opt)
  25 {
  26         struct child_process rev_list = CHILD_PROCESS_INIT;
  27         FILE *rev_list_in;
  28         struct check_connected_options defaults = CHECK_CONNECTED_INIT;
  29         const struct object_id *oid;
  30         int err = 0;
  31         struct packed_git *new_pack = NULL;
  32         struct transport *transport;
  33         size_t base_len;
  34
  35         if (!opt)
  36                 opt = &defaults;
  37         transport = opt->transport;
  38
  39         oid = fn(cb_data);
  40         if (!oid) {
  41                 if (opt->err_fd)
  42                         close(opt->err_fd);
  43                 return err;
  44         }
  45
  46         if (transport && transport->smart_options &&
  47             transport->smart_options->self_contained_and_connected &&
  48             transport->pack_lockfiles.nr == 1 &&
  49             strip_suffix(transport->pack_lockfiles.items[0].string,
  50                          ".keep", &base_len)) {
  51                 struct strbuf idx_file = STRBUF_INIT;
  52                 strbuf_add(&idx_file, transport->pack_lockfiles.items[0].string,
  53                            base_len);
  54                 strbuf_addstr(&idx_file, ".idx");
  55                 new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
  56                 strbuf_release(&idx_file);
  57         }
  58
  59         if (repo_has_promisor_remote(the_repository)) {
  60                 /*
  61                  * For partial clones, we don't want to have to do a regular
  62                  * connectivity check because we have to enumerate and exclude
  63                  * all promisor objects (slow), and then the connectivity check
  64                  * itself becomes a no-op because in a partial clone every
  65                  * object is a promisor object. Instead, just make sure we
  66                  * received, in a promisor packfile, the objects pointed to by
  67                  * each wanted ref.
  68                  *
  69                  * Before checking for promisor packs, be sure we have the
  70                  * latest pack-files loaded into memory.
  71                  */
  72                 reprepare_packed_git(the_repository);
  73                 do {
  74                         struct packed_git *p;
  75
  76                         for (p = get_all_packs(the_repository); p; p = p->next) {
  77                                 if (!p->pack_promisor)
  78                                         continue;
  79                                 if (find_pack_entry_one(oid->hash, p))
  80                                         goto promisor_pack_found;
  81                         }
  82                         /*
  83                          * Fallback to rev-list with oid and the rest of the
  84                          * object IDs provided by fn.
  85                          */
  86                         goto no_promisor_pack_found;
  87 promisor_pack_found:
  88                         ;
  89                 } while ((oid = fn(cb_data)) != NULL);
  90                 free(new_pack);
  91                 return 0;
  92         }
  93
  94 no_promisor_pack_found:
  95         if (opt->shallow_file) {
  96                 strvec_push(&rev_list.args, "--shallow-file");
  97                 strvec_push(&rev_list.args, opt->shallow_file);
  98         }
  99         strvec_push(&rev_list.args,"rev-list");
 100         strvec_push(&rev_list.args, "--objects");
 101         strvec_push(&rev_list.args, "--stdin");
 102         if (repo_has_promisor_remote(the_repository))
 103                 strvec_push(&rev_list.args, "--exclude-promisor-objects");
 104         if (!opt->is_deepening_fetch) {
 105                 strvec_push(&rev_list.args, "--not");
 106                 if (opt->exclude_hidden_refs_section)
 107                         strvec_pushf(&rev_list.args, "--exclude-hidden=%s",
 108                                      opt->exclude_hidden_refs_section);
 109                 strvec_push(&rev_list.args, "--all");
 110         }
 111         strvec_push(&rev_list.args, "--quiet");
 112         strvec_push(&rev_list.args, "--alternate-refs");
 113         if (opt->progress)
 114                 strvec_pushf(&rev_list.args, "--progress=%s",
 115                              _("Checking connectivity"));
 116
 117         rev_list.git_cmd = 1;
 118         if (opt->env)
 119                 strvec_pushv(&rev_list.env, opt->env);
 120         rev_list.in = -1;
 121         rev_list.no_stdout = 1;
 122         if (opt->err_fd)
 123                 rev_list.err = opt->err_fd;
 124         else
 125                 rev_list.no_stderr = opt->quiet;
 126
 127         if (start_command(&rev_list)) {
 128                 free(new_pack);
 129                 return error(_("Could not run 'git rev-list'"));
 130         }
 131
 132         sigchain_push(SIGPIPE, SIG_IGN);
 133
 134         rev_list_in = xfdopen(rev_list.in, "w");
 135
 136         do {
 137                 /*
 138                  * If index-pack already checked that:
 139                  * - there are no dangling pointers in the new pack
 140                  * - the pack is self contained
 141                  * Then if the updated ref is in the new pack, then we
 142                  * are sure the ref is good and not sending it to
 143                  * rev-list for verification.
 144                  */
 145                 if (new_pack && find_pack_entry_one(oid->hash, new_pack))
 146                         continue;
 147
 148                 if (fprintf(rev_list_in, "%s\n", oid_to_hex(oid)) < 0)
 149                         break;
 150         } while ((oid = fn(cb_data)) != NULL);
 151
 152         if (ferror(rev_list_in) || fflush(rev_list_in)) {
 153                 if (errno != EPIPE && errno != EINVAL)
 154                         error_errno(_("failed write to rev-list"));
 155                 err = -1;
 156         }
 157
 158         if (fclose(rev_list_in))
 159                 err = error_errno(_("failed to close rev-list's stdin"));
 160
 161         sigchain_pop(SIGPIPE);
 162         free(new_pack);
 163         return finish_command(&rev_list) || err;
 164 }