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

   1#include "builtin.h"
   2#include "cache.h"
   3#include "refs.h"
   4#include "object.h"
   5#include "tag.h"
   6#include "string-list.h"
   7#include "parse-options.h"
   8
   9static const char * const show_ref_usage[] = {
  10        N_("git show-ref [-q | --quiet] [--verify] [--head] [-d | --dereference] [-s | --hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [<pattern>...]"),
  11        N_("git show-ref --exclude-existing[=pattern] < ref-list"),
  12        NULL
  13};
  14
  15static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
  16           quiet, hash_only, abbrev, exclude_arg;
  17static const char **pattern;
  18static const char *exclude_existing_arg;
  19
  20static void show_one(const char *refname, const unsigned char *sha1)
  21{
  22        const char *hex = find_unique_abbrev(sha1, abbrev);
  23        if (hash_only)
  24                printf("%s\n", hex);
  25        else
  26                printf("%s %s\n", hex, refname);
  27}
  28
  29static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  30{
  31        const char *hex;
  32        unsigned char peeled[20];
  33
  34        if (show_head && !strcmp(refname, "HEAD"))
  35                goto match;
  36
  37        if (tags_only || heads_only) {
  38                int match;
  39
  40                match = heads_only && starts_with(refname, "refs/heads/");
  41                match |= tags_only && starts_with(refname, "refs/tags/");
  42                if (!match)
  43                        return 0;
  44        }
  45        if (pattern) {
  46                int reflen = strlen(refname);
  47                const char **p = pattern, *m;
  48                while ((m = *p++) != NULL) {
  49                        int len = strlen(m);
  50                        if (len > reflen)
  51                                continue;
  52                        if (memcmp(m, refname + reflen - len, len))
  53                                continue;
  54                        if (len == reflen)
  55                                goto match;
  56                        /* "--verify" requires an exact match */
  57                        if (verify)
  58                                continue;
  59                        if (refname[reflen - len - 1] == '/')
  60                                goto match;
  61                }
  62                return 0;
  63        }
  64
  65match:
  66        found_match++;
  67
  68        /* This changes the semantics slightly that even under quiet we
  69         * detect and return error if the repository is corrupt and
  70         * ref points at a nonexistent object.
  71         */
  72        if (!has_sha1_file(sha1))
  73                die("git show-ref: bad ref %s (%s)", refname,
  74                    sha1_to_hex(sha1));
  75
  76        if (quiet)
  77                return 0;
  78
  79        show_one(refname, sha1);
  80
  81        if (!deref_tags)
  82                return 0;
  83
  84        if (!peel_ref(refname, peeled)) {
  85                hex = find_unique_abbrev(peeled, abbrev);
  86                printf("%s %s^{}\n", hex, refname);
  87        }
  88        return 0;
  89}
  90
  91static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  92{
  93        struct string_list *list = (struct string_list *)cbdata;
  94        string_list_insert(list, refname);
  95        return 0;
  96}
  97
  98/*
  99 * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 100 * and
 101 * (1) strip "^{}" at the end of line if any;
 102 * (2) ignore if match is provided and does not head-match refname;
 103 * (3) warn if refname is not a well-formed refname and skip;
 104 * (4) ignore if refname is a ref that exists in the local repository;
 105 * (5) otherwise output the line.
 106 */
 107static int exclude_existing(const char *match)
 108{
 109        static struct string_list existing_refs = STRING_LIST_INIT_DUP;
 110        char buf[1024];
 111        int matchlen = match ? strlen(match) : 0;
 112
 113        for_each_ref(add_existing, &existing_refs);
 114        while (fgets(buf, sizeof(buf), stdin)) {
 115                char *ref;
 116                int len = strlen(buf);
 117
 118                if (len > 0 && buf[len - 1] == '\n')
 119                        buf[--len] = '\0';
 120                if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 121                        len -= 3;
 122                        buf[len] = '\0';
 123                }
 124                for (ref = buf + len; buf < ref; ref--)
 125                        if (isspace(ref[-1]))
 126                                break;
 127                if (match) {
 128                        int reflen = buf + len - ref;
 129                        if (reflen < matchlen)
 130                                continue;
 131                        if (strncmp(ref, match, matchlen))
 132                                continue;
 133                }
 134                if (check_refname_format(ref, 0)) {
 135                        warning("ref '%s' ignored", ref);
 136                        continue;
 137                }
 138                if (!string_list_has_string(&existing_refs, ref)) {
 139                        printf("%s\n", buf);
 140                }
 141        }
 142        return 0;
 143}
 144
 145static int hash_callback(const struct option *opt, const char *arg, int unset)
 146{
 147        hash_only = 1;
 148        /* Use full length SHA1 if no argument */
 149        if (!arg)
 150                return 0;
 151        return parse_opt_abbrev_cb(opt, arg, unset);
 152}
 153
 154static int exclude_existing_callback(const struct option *opt, const char *arg,
 155                                     int unset)
 156{
 157        exclude_arg = 1;
 158        *(const char **)opt->value = arg;
 159        return 0;
 160}
 161
 162static int help_callback(const struct option *opt, const char *arg, int unset)
 163{
 164        return -1;
 165}
 166
 167static const struct option show_ref_options[] = {
 168        OPT_BOOL(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
 169        OPT_BOOL(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
 170        OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
 171                    "requires exact ref path")),
 172        OPT_HIDDEN_BOOL('h', NULL, &show_head,
 173                        N_("show the HEAD reference, even if it would be filtered out")),
 174        OPT_BOOL(0, "head", &show_head,
 175          N_("show the HEAD reference, even if it would be filtered out")),
 176        OPT_BOOL('d', "dereference", &deref_tags,
 177                    N_("dereference tags into object IDs")),
 178        { OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"),
 179          N_("only show SHA1 hash using <n> digits"),
 180          PARSE_OPT_OPTARG, &hash_callback },
 181        OPT__ABBREV(&abbrev),
 182        OPT__QUIET(&quiet,
 183                   N_("do not print results to stdout (useful with --verify)")),
 184        { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg,
 185          N_("pattern"), N_("show refs from stdin that aren't in local repository"),
 186          PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback },
 187        { OPTION_CALLBACK, 0, "help-all", NULL, NULL, N_("show usage"),
 188          PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, help_callback },
 189        OPT_END()
 190};
 191
 192int cmd_show_ref(int argc, const char **argv, const char *prefix)
 193{
 194        if (argc == 2 && !strcmp(argv[1], "-h"))
 195                usage_with_options(show_ref_usage, show_ref_options);
 196
 197        argc = parse_options(argc, argv, prefix, show_ref_options,
 198                             show_ref_usage, PARSE_OPT_NO_INTERNAL_HELP);
 199
 200        if (exclude_arg)
 201                return exclude_existing(exclude_existing_arg);
 202
 203        pattern = argv;
 204        if (!*pattern)
 205                pattern = NULL;
 206
 207        if (verify) {
 208                if (!pattern)
 209                        die("--verify requires a reference");
 210                while (*pattern) {
 211                        unsigned char sha1[20];
 212
 213                        if (starts_with(*pattern, "refs/") &&
 214                            !read_ref(*pattern, sha1)) {
 215                                if (!quiet)
 216                                        show_one(*pattern, sha1);
 217                        }
 218                        else if (!quiet)
 219                                die("'%s' - not a valid ref", *pattern);
 220                        else
 221                                return 1;
 222                        pattern++;
 223                }
 224                return 0;
 225        }
 226
 227        if (show_head)
 228                head_ref(show_ref, NULL);
 229        for_each_ref(show_ref, NULL);
 230        if (!found_match) {
 231                if (verify && !quiet)
 232                        die("No match");
 233                return 1;
 234        }
 235        return 0;
 236}