builtin/symbolic-ref.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "cache.h"
   4 #include "refs.h"
   5 #include "parse-options.h"
   6
   7 static const char * const git_symbolic_ref_usage[] = {
   8         N_("git symbolic-ref [<options>] <name> [<ref>]"),
   9         N_("git symbolic-ref -d [-q] <name>"),
  10         NULL
  11 };
  12
  13 static int check_symref(const char *HEAD, int quiet, int shorten, int print)
  14 {
  15         unsigned char sha1[20];
  16         int flag;
  17         const char *refname = resolve_ref_unsafe(HEAD, 0, sha1, &flag);
  18
  19         if (!refname)
  20                 die("No such ref: %s", HEAD);
  21         else if (!(flag & REF_ISSYMREF)) {
  22                 if (!quiet)
  23                         die("ref %s is not a symbolic ref", HEAD);
  24                 else
  25                         return 1;
  26         }
  27         if (print) {
  28                 if (shorten)
  29                         refname = shorten_unambiguous_ref(refname, 0);
  30                 puts(refname);
  31         }
  32         return 0;
  33 }
  34
  35 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  36 {
  37         int quiet = 0, delete = 0, shorten = 0, ret = 0;
  38         const char *msg = NULL;
  39         struct option options[] = {
  40                 OPT__QUIET(&quiet,
  41                         N_("suppress error message for non-symbolic (detached) refs")),
  42                 OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
  43                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
  44                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
  45                 OPT_END(),
  46         };
  47
  48         git_config(git_default_config, NULL);
  49         argc = parse_options(argc, argv, prefix, options,
  50                              git_symbolic_ref_usage, 0);
  51         if (msg && !*msg)
  52                 die("Refusing to perform update with empty message");
  53
  54         if (delete) {
  55                 if (argc != 1)
  56                         usage_with_options(git_symbolic_ref_usage, options);
  57                 ret = check_symref(argv[0], 1, 0, 0);
  58                 if (ret)
  59                         die("Cannot delete %s, not a symbolic ref", argv[0]);
  60                 if (!strcmp(argv[0], "HEAD"))
  61                         die("deleting '%s' is not allowed", argv[0]);
  62                 return delete_ref(NULL, argv[0], NULL, REF_NODEREF);
  63         }
  64
  65         switch (argc) {
  66         case 1:
  67                 ret = check_symref(argv[0], quiet, shorten, 1);
  68                 break;
  69         case 2:
  70                 if (!strcmp(argv[0], "HEAD") &&
  71                     !starts_with(argv[1], "refs/"))
  72                         die("Refusing to point HEAD outside of refs/");
  73                 ret = !!create_symref(argv[0], argv[1], msg);
  74                 break;
  75         default:
  76                 usage_with_options(git_symbolic_ref_usage, options);
  77         }
  78         return ret;
  79 }