builtin-symbolic-ref.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4
   5 static const char git_symbolic_ref_usage[] =
   6 "git-symbolic-ref [-q] name [ref]";
   7
   8 static void check_symref(const char *HEAD, int quiet)
   9 {
  10         unsigned char sha1[20];
  11         int flag;
  12         const char *refs_heads_master = resolve_ref(HEAD, sha1, 0, &flag);
  13
  14         if (!refs_heads_master)
  15                 die("No such ref: %s", HEAD);
  16         else if (!(flag & REF_ISSYMREF)) {
  17                 if (!quiet)
  18                         die("ref %s is not a symbolic ref", HEAD);
  19                 else
  20                         exit(1);
  21         }
  22         puts(refs_heads_master);
  23 }
  24
  25 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  26 {
  27         int quiet = 0;
  28
  29         git_config(git_default_config);
  30
  31         while (1 < argc) {
  32                 const char *arg = argv[1];
  33                 if (arg[0] != '-')
  34                         break;
  35                 else if (!strcmp("-q", arg))
  36                         quiet = 1;
  37                 else if (!strcmp("--", arg)) {
  38                         argc--;
  39                         argv++;
  40                         break;
  41                 }
  42                 else
  43                         die("unknown option %s", arg);
  44                 argc--;
  45                 argv++;
  46         }
  47
  48         switch (argc) {
  49         case 2:
  50                 check_symref(argv[1], quiet);
  51                 break;
  52         case 3:
  53                 create_symref(argv[1], argv[2]);
  54                 break;
  55         default:
  56                 usage(git_symbolic_ref_usage);
  57         }
  58         return 0;
  59 }