builtin/symbolic-ref.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "gettext.h"
   4 #include "refs.h"
   5 #include "parse-options.h"
   6 #include "strbuf.h"
   7
   8 static const char * const git_symbolic_ref_usage[] = {
   9         N_("git symbolic-ref [-m <reason>] <name> <ref>"),
  10         N_("git symbolic-ref [-q] [--short] [--no-recurse] <name>"),
  11         N_("git symbolic-ref --delete [-q] <name>"),
  12         NULL
  13 };
  14
  15 static int check_symref(const char *HEAD, int quiet, int shorten, int recurse, int print)
  16 {
  17         int resolve_flags, flag;
  18         const char *refname;
  19
  20         resolve_flags = (recurse ? 0 : RESOLVE_REF_NO_RECURSE);
  21         refname = resolve_ref_unsafe(HEAD, resolve_flags, NULL, &flag);
  22
  23         if (!refname)
  24                 die("No such ref: %s", HEAD);
  25         else if (!(flag & REF_ISSYMREF)) {
  26                 if (!quiet)
  27                         die("ref %s is not a symbolic ref", HEAD);
  28                 else
  29                         return 1;
  30         }
  31         if (print) {
  32                 char *to_free = NULL;
  33                 if (shorten)
  34                         refname = to_free = shorten_unambiguous_ref(refname, 0);
  35                 puts(refname);
  36                 free(to_free);
  37         }
  38         return 0;
  39 }
  40
  41 int cmd_symbolic_ref(int argc, const char **argv, const char *prefix)
  42 {
  43         int quiet = 0, delete = 0, shorten = 0, recurse = 1, ret = 0;
  44         const char *msg = NULL;
  45         struct option options[] = {
  46                 OPT__QUIET(&quiet,
  47                         N_("suppress error message for non-symbolic (detached) refs")),
  48                 OPT_BOOL('d', "delete", &delete, N_("delete symbolic ref")),
  49                 OPT_BOOL(0, "short", &shorten, N_("shorten ref output")),
  50                 OPT_BOOL(0, "recurse", &recurse, N_("recursively dereference (default)")),
  51                 OPT_STRING('m', NULL, &msg, N_("reason"), N_("reason of the update")),
  52                 OPT_END(),
  53         };
  54
  55         git_config(git_default_config, NULL);
  56         argc = parse_options(argc, argv, prefix, options,
  57                              git_symbolic_ref_usage, 0);
  58         if (msg && !*msg)
  59                 die("Refusing to perform update with empty message");
  60
  61         if (delete) {
  62                 if (argc != 1)
  63                         usage_with_options(git_symbolic_ref_usage, options);
  64                 ret = check_symref(argv[0], 1, 0, 0, 0);
  65                 if (ret)
  66                         die("Cannot delete %s, not a symbolic ref", argv[0]);
  67                 if (!strcmp(argv[0], "HEAD"))
  68                         die("deleting '%s' is not allowed", argv[0]);
  69                 return delete_ref(NULL, argv[0], NULL, REF_NO_DEREF);
  70         }
  71
  72         switch (argc) {
  73         case 1:
  74                 ret = check_symref(argv[0], quiet, shorten, recurse, 1);
  75                 break;
  76         case 2:
  77                 if (!strcmp(argv[0], "HEAD") &&
  78                     !starts_with(argv[1], "refs/"))
  79                         die("Refusing to point HEAD outside of refs/");
  80                 if (check_refname_format(argv[1], REFNAME_ALLOW_ONELEVEL) < 0)
  81                         die("Refusing to set '%s' to invalid ref '%s'", argv[0], argv[1]);
  82                 ret = !!create_symref(argv[0], argv[1], msg);
  83                 break;
  84         default:
  85                 usage_with_options(git_symbolic_ref_usage, options);
  86         }
  87         return ret;
  88 }