Andrew's git - gitweb.git/blob - builtin/symbolic-ref.c

   1#include "builtin.h"
   2#include "cache.h"
   3#include "refs.h"
   4#include "parse-options.h"
   5
   6static 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
  12static 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
  34int 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}