connected.c

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