builtin/symbolic-ref.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4 #include "parse-options.h"
   5
   6 static const char * const git_symbolic_ref_usage[] = {
   7         "git symbolic-ref [options] name [ref]",
   8         NULL
   9 };
  10
  11 static void check_symref(const char *HEAD, int quiet)
  12 {
  13         unsigned char sha1[20];
  14         int flag;
  15         const char *refs_heads_master = resolve_ref_unsafe(HEAD, sha1, 0, &flag);
  16
  17         if (!refs_heads_master)
  18                 die("No such ref: %s", HEAD);
  19         else if (!(flag & REF_ISSYMREF)) {
  20                 if (!quiet)
  21                         die("ref %s is not a symbolic ref", HEAD);
  22                 else
  23                         exit(1);
  24         }
  25         puts(refs_heads_master);
  26 }
  27
  28 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  29 {
  30         int quiet = 0;
  31         const char *msg = NULL;
  32         struct option options[] = {
  33                 OPT__QUIET(&quiet,
  34                         "suppress error message for non-symbolic (detached) refs"),
  35                 OPT_STRING('m', NULL, &msg, "reason", "reason of the update"),
  36                 OPT_END(),
  37         };
  38
  39         git_config(git_default_config, NULL);
  40         argc = parse_options(argc, argv, prefix, options,
  41                              git_symbolic_ref_usage, 0);
  42         if (msg &&!*msg)
  43                 die("Refusing to perform update with empty message");
  44         switch (argc) {
  45         case 1:
  46                 check_symref(argv[0], quiet);
  47                 break;
  48         case 2:
  49                 if (!strcmp(argv[0], "HEAD") &&
  50                     prefixcmp(argv[1], "refs/"))
  51                         die("Refusing to point HEAD outside of refs/");
  52                 create_symref(argv[0], argv[1], msg);
  53                 break;
  54         default:
  55                 usage_with_options(git_symbolic_ref_usage, options);
  56         }
  57         return 0;
  58 }