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] [--no-recurse] <name>"),
  10         NULL
  11 };
  12
  13 static int check_symref(const char *HEAD, int quiet, int shorten, int recurse, int print)
  14 {
  15         int resolve_flags, flag;
  16         const char *refname;
  17
  18         resolve_flags = (recurse ? 0 : RESOLVE_REF_NO_RECURSE);
  19         refname = resolve_ref_unsafe(HEAD, resolve_flags, NULL, &flag);
  20
  21         if (!refname)
  22                 die("No such ref: %s", HEAD);
  23         else if (!(flag & REF_ISSYMREF)) {
  24                 if (!quiet)
  25                         die("ref %s is not a symbolic ref", HEAD);
  26                 else
  27                         return 1;
  28         }
  29         if (print) {
  30                 char *to_free = NULL;
  31                 if (shorten)
  32                         refname = to_free = shorten_unambiguous_ref(refname, 0);
  33                 puts(refname);
  34                 free(to_free);
  35         }
  36         return 0;
  37 }
  38
  39 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  40 {
  41         int quiet = 0, delete = 0, shorten = 0, recurse = 1, ret = 0;
  42         const char *msg = NULL;
  43         struct option options[] = {
  44                 OPT__QUIET(&quiet,
  45                         N_("suppress error message for non-symbolic (detached) refs")),
  46                 OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
  47                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
  48                 OPT_BOOL(0, "recurse", &recurse, N_("recursively dereference (default)")),
  49                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
  50                 OPT_END(),
  51         };
  52
  53         git_config(git_default_config, NULL);
  54         argc = parse_options(argc, argv, prefix, options,
  55                              git_symbolic_ref_usage, 0);
  56         if (msg && !*msg)
  57                 die("Refusing to perform update with empty message");
  58
  59         if (delete) {
  60                 if (argc != 1)
  61                         usage_with_options(git_symbolic_ref_usage, options);
  62                 ret = check_symref(argv[0], 1, 0, 0, 0);
  63                 if (ret)
  64                         die("Cannot delete %s, not a symbolic ref", argv[0]);
  65                 if (!strcmp(argv[0], "HEAD"))
  66                         die("deleting '%s' is not allowed", argv[0]);
  67                 return delete_ref(NULL, argv[0], NULL, REF_NO_DEREF);
  68         }
  69
  70         switch (argc) {
  71         case 1:
  72                 ret = check_symref(argv[0], quiet, shorten, recurse, 1);
  73                 break;
  74         case 2:
  75                 if (!strcmp(argv[0], "HEAD") &&
  76                     !starts_with(argv[1], "refs/"))
  77                         die("Refusing to point HEAD outside of refs/");
  78                 if (check_refname_format(argv[1], REFNAME_ALLOW_ONELEVEL) < 0)
  79                         die("Refusing to set '%s' to invalid ref '%s'", argv[0], argv[1]);
  80                 ret = !!create_symref(argv[0], argv[1], msg);
  81                 break;
  82         default:
  83                 usage_with_options(git_symbolic_ref_usage, options);
  84         }
  85         return ret;
  86 }