Andrew's git - gitweb.git/blob - 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
   7static 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
  13static 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
  35int 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}