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         N_("git symbolic-ref [<options>] <name> [<ref>]"),
   8         N_("git symbolic-ref -d [-q] <name>"),
   9         NULL
  10 };
  11
  12 static int check_symref(const char *HEAD, int quiet, int shorten, int print)
  13 {
  14         unsigned char sha1[20];
  15         int flag;
  16         const char *refname = resolve_ref_unsafe(HEAD, 0, sha1, &flag);
  17
  18         if (!refname)
  19                 die("No such ref: %s", HEAD);
  20         else if (!(flag & REF_ISSYMREF)) {
  21                 if (!quiet)
  22                         die("ref %s is not a symbolic ref", HEAD);
  23                 else
  24                         return 1;
  25         }
  26         if (print) {
  27                 if (shorten)
  28                         refname = shorten_unambiguous_ref(refname, 0);
  29                 puts(refname);
  30         }
  31         return 0;
  32 }
  33
  34 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  35 {
  36         int quiet = 0, delete = 0, shorten = 0, ret = 0;
  37         const char *msg = NULL;
  38         struct option options[] = {
  39                 OPT__QUIET(&quiet,
  40                         N_("suppress error message for non-symbolic (detached) refs")),
  41                 OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
  42                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
  43                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
  44                 OPT_END(),
  45         };
  46
  47         git_config(git_default_config, NULL);
  48         argc = parse_options(argc, argv, prefix, options,
  49                              git_symbolic_ref_usage, 0);
  50         if (msg && !*msg)
  51                 die("Refusing to perform update with empty message");
  52
  53         if (delete) {
  54                 if (argc != 1)
  55                         usage_with_options(git_symbolic_ref_usage, options);
  56                 ret = check_symref(argv[0], 1, 0, 0);
  57                 if (ret)
  58                         die("Cannot delete %s, not a symbolic ref", argv[0]);
  59                 if (!strcmp(argv[0], "HEAD"))
  60                         die("deleting '%s' is not allowed", argv[0]);
  61                 return delete_ref(NULL, argv[0], NULL, REF_NODEREF);
  62         }
  63
  64         switch (argc) {
  65         case 1:
  66                 ret = check_symref(argv[0], quiet, shorten, 1);
  67                 break;
  68         case 2:
  69                 if (!strcmp(argv[0], "HEAD") &&
  70                     !starts_with(argv[1], "refs/"))
  71                         die("Refusing to point HEAD outside of refs/");
  72                 ret = !!create_symref(argv[0], argv[1], msg);
  73                 break;
  74         default:
  75                 usage_with_options(git_symbolic_ref_usage, options);
  76         }
  77         return ret;
  78 }