builtin/mktag.c

   1 #include "builtin.h"
   2 #include "gettext.h"
   3 #include "hex.h"
   4 #include "parse-options.h"
   5 #include "strbuf.h"
   6 #include "replace-object.h"
   7 #include "object-file.h"
   8 #include "object-store-ll.h"
   9 #include "fsck.h"
  10 #include "config.h"
  11
  12 static char const * const builtin_mktag_usage[] = {
  13         "git mktag",
  14         NULL
  15 };
  16 static int option_strict = 1;
  17
  18 static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
  19
  20 static int mktag_fsck_error_func(struct fsck_options *o UNUSED,
  21                                  const struct object_id *oid UNUSED,
  22                                  enum object_type object_type UNUSED,
  23                                  enum fsck_msg_type msg_type,
  24                                  enum fsck_msg_id msg_id UNUSED,
  25                                  const char *message)
  26 {
  27         switch (msg_type) {
  28         case FSCK_WARN:
  29                 if (!option_strict) {
  30                         fprintf_ln(stderr, _("warning: tag input does not pass fsck: %s"), message);
  31                         return 0;
  32
  33                 }
  34                 /* fallthrough */
  35         case FSCK_ERROR:
  36                 /*
  37                  * We treat both warnings and errors as errors, things
  38                  * like missing "tagger" lines are "only" warnings
  39                  * under fsck, we've always considered them an error.
  40                  */
  41                 fprintf_ln(stderr, _("error: tag input does not pass fsck: %s"), message);
  42                 return 1;
  43         default:
  44                 BUG(_("%d (FSCK_IGNORE?) should never trigger this callback"),
  45                     msg_type);
  46         }
  47 }
  48
  49 static int verify_object_in_tag(struct object_id *tagged_oid, int *tagged_type)
  50 {
  51         int ret;
  52         enum object_type type;
  53         unsigned long size;
  54         void *buffer;
  55         const struct object_id *repl;
  56
  57         buffer = repo_read_object_file(the_repository, tagged_oid, &type,
  58                                        &size);
  59         if (!buffer)
  60                 die(_("could not read tagged object '%s'"),
  61                     oid_to_hex(tagged_oid));
  62         if (type != *tagged_type)
  63                 die(_("object '%s' tagged as '%s', but is a '%s' type"),
  64                     oid_to_hex(tagged_oid),
  65                     type_name(*tagged_type), type_name(type));
  66
  67         repl = lookup_replace_object(the_repository, tagged_oid);
  68         ret = check_object_signature(the_repository, repl, buffer, size,
  69                                      *tagged_type);
  70         free(buffer);
  71
  72         return ret;
  73 }
  74
  75 int cmd_mktag(int argc, const char **argv, const char *prefix)
  76 {
  77         static struct option builtin_mktag_options[] = {
  78                 OPT_BOOL(0, "strict", &option_strict,
  79                          N_("enable more strict checking")),
  80                 OPT_END(),
  81         };
  82         struct strbuf buf = STRBUF_INIT;
  83         struct object_id tagged_oid;
  84         int tagged_type;
  85         struct object_id result;
  86
  87         argc = parse_options(argc, argv, prefix,
  88                              builtin_mktag_options,
  89                              builtin_mktag_usage, 0);
  90
  91         if (strbuf_read(&buf, 0, 0) < 0)
  92                 die_errno(_("could not read from stdin"));
  93
  94         fsck_options.error_func = mktag_fsck_error_func;
  95         fsck_set_msg_type_from_ids(&fsck_options, FSCK_MSG_EXTRA_HEADER_ENTRY,
  96                                    FSCK_WARN);
  97         /* config might set fsck.extraHeaderEntry=* again */
  98         git_config(git_fsck_config, &fsck_options);
  99         if (fsck_tag_standalone(NULL, buf.buf, buf.len, &fsck_options,
 100                                 &tagged_oid, &tagged_type))
 101                 die(_("tag on stdin did not pass our strict fsck check"));
 102
 103         if (verify_object_in_tag(&tagged_oid, &tagged_type) < 0)
 104                 die(_("tag on stdin did not refer to a valid object"));
 105
 106         if (write_object_file(buf.buf, buf.len, OBJ_TAG, &result) < 0)
 107                 die(_("unable to write tag file"));
 108
 109         strbuf_release(&buf);
 110         puts(oid_to_hex(&result));
 111         return 0;
 112 }