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
   8static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] < ref-list";
   9
  10static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
  11        found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
  12static const char **pattern;
  13
  14static void show_one(const char *refname, const unsigned char *sha1)
  15{
  16        const char *hex = find_unique_abbrev(sha1, abbrev);
  17        if (hash_only)
  18                printf("%s\n", hex);
  19        else
  20                printf("%s %s\n", hex, refname);
  21}
  22
  23static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  24{
  25        struct object *obj;
  26        const char *hex;
  27        unsigned char peeled[20];
  28
  29        if (tags_only || heads_only) {
  30                int match;
  31
  32                match = heads_only && !prefixcmp(refname, "refs/heads/");
  33                match |= tags_only && !prefixcmp(refname, "refs/tags/");
  34                if (!match)
  35                        return 0;
  36        }
  37        if (pattern) {
  38                int reflen = strlen(refname);
  39                const char **p = pattern, *m;
  40                while ((m = *p++) != NULL) {
  41                        int len = strlen(m);
  42                        if (len > reflen)
  43                                continue;
  44                        if (memcmp(m, refname + reflen - len, len))
  45                                continue;
  46                        if (len == reflen)
  47                                goto match;
  48                        /* "--verify" requires an exact match */
  49                        if (verify)
  50                                continue;
  51                        if (refname[reflen - len - 1] == '/')
  52                                goto match;
  53                }
  54                return 0;
  55        }
  56
  57match:
  58        found_match++;
  59
  60        /* This changes the semantics slightly that even under quiet we
  61         * detect and return error if the repository is corrupt and
  62         * ref points at a nonexistent object.
  63         */
  64        if (!has_sha1_file(sha1))
  65                die("git show-ref: bad ref %s (%s)", refname,
  66                    sha1_to_hex(sha1));
  67
  68        if (quiet)
  69                return 0;
  70
  71        show_one(refname, sha1);
  72
  73        if (!deref_tags)
  74                return 0;
  75
  76        if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
  77                if (!is_null_sha1(peeled)) {
  78                        hex = find_unique_abbrev(peeled, abbrev);
  79                        printf("%s %s^{}\n", hex, refname);
  80                }
  81        }
  82        else {
  83                obj = parse_object(sha1);
  84                if (!obj)
  85                        die("git show-ref: bad ref %s (%s)", refname,
  86                            sha1_to_hex(sha1));
  87                if (obj->type == OBJ_TAG) {
  88                        obj = deref_tag(obj, refname, 0);
  89                        if (!obj)
  90                                die("git show-ref: bad tag at ref %s (%s)", refname,
  91                                    sha1_to_hex(sha1));
  92                        hex = find_unique_abbrev(obj->sha1, abbrev);
  93                        printf("%s %s^{}\n", hex, refname);
  94                }
  95        }
  96        return 0;
  97}
  98
  99static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
 100{
 101        struct string_list *list = (struct string_list *)cbdata;
 102        string_list_insert(refname, list);
 103        return 0;
 104}
 105
 106/*
 107 * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 108 * and
 109 * (1) strip "^{}" at the end of line if any;
 110 * (2) ignore if match is provided and does not head-match refname;
 111 * (3) warn if refname is not a well-formed refname and skip;
 112 * (4) ignore if refname is a ref that exists in the local repository;
 113 * (5) otherwise output the line.
 114 */
 115static int exclude_existing(const char *match)
 116{
 117        static struct string_list existing_refs = { NULL, 0, 0, 0 };
 118        char buf[1024];
 119        int matchlen = match ? strlen(match) : 0;
 120
 121        for_each_ref(add_existing, &existing_refs);
 122        while (fgets(buf, sizeof(buf), stdin)) {
 123                char *ref;
 124                int len = strlen(buf);
 125
 126                if (len > 0 && buf[len - 1] == '\n')
 127                        buf[--len] = '\0';
 128                if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 129                        len -= 3;
 130                        buf[len] = '\0';
 131                }
 132                for (ref = buf + len; buf < ref; ref--)
 133                        if (isspace(ref[-1]))
 134                                break;
 135                if (match) {
 136                        int reflen = buf + len - ref;
 137                        if (reflen < matchlen)
 138                                continue;
 139                        if (strncmp(ref, match, matchlen))
 140                                continue;
 141                }
 142                if (check_ref_format(ref)) {
 143                        fprintf(stderr, "warning: ref '%s' ignored\n", ref);
 144                        continue;
 145                }
 146                if (!string_list_has_string(&existing_refs, ref)) {
 147                        printf("%s\n", buf);
 148                }
 149        }
 150        return 0;
 151}
 152
 153int cmd_show_ref(int argc, const char **argv, const char *prefix)
 154{
 155        int i;
 156
 157        for (i = 1; i < argc; i++) {
 158                const char *arg = argv[i];
 159                if (*arg != '-') {
 160                        pattern = argv + i;
 161                        break;
 162                }
 163                if (!strcmp(arg, "--")) {
 164                        pattern = argv + i + 1;
 165                        if (!*pattern)
 166                                pattern = NULL;
 167                        break;
 168                }
 169                if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 170                        quiet = 1;
 171                        continue;
 172                }
 173                if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 174                        show_head = 1;
 175                        continue;
 176                }
 177                if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 178                        deref_tags = 1;
 179                        continue;
 180                }
 181                if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 182                        hash_only = 1;
 183                        continue;
 184                }
 185                if (!prefixcmp(arg, "--hash=") ||
 186                    (!prefixcmp(arg, "--abbrev") &&
 187                     (arg[8] == '=' || arg[8] == '\0'))) {
 188                        if (arg[2] != 'h' && !arg[8])
 189                                /* --abbrev only */
 190                                abbrev = DEFAULT_ABBREV;
 191                        else {
 192                                /* --hash= or --abbrev= */
 193                                char *end;
 194                                if (arg[2] == 'h') {
 195                                        hash_only = 1;
 196                                        arg += 7;
 197                                }
 198                                else
 199                                        arg += 9;
 200                                abbrev = strtoul(arg, &end, 10);
 201                                if (*end || abbrev > 40)
 202                                        usage(show_ref_usage);
 203                                if (abbrev < MINIMUM_ABBREV)
 204                                        abbrev = MINIMUM_ABBREV;
 205                        }
 206                        continue;
 207                }
 208                if (!strcmp(arg, "--verify")) {
 209                        verify = 1;
 210                        continue;
 211                }
 212                if (!strcmp(arg, "--tags")) {
 213                        tags_only = 1;
 214                        continue;
 215                }
 216                if (!strcmp(arg, "--heads")) {
 217                        heads_only = 1;
 218                        continue;
 219                }
 220                if (!strcmp(arg, "--exclude-existing"))
 221                        return exclude_existing(NULL);
 222                if (!prefixcmp(arg, "--exclude-existing="))
 223                        return exclude_existing(arg + 19);
 224                usage(show_ref_usage);
 225        }
 226
 227        if (verify) {
 228                if (!pattern)
 229                        die("--verify requires a reference");
 230                while (*pattern) {
 231                        unsigned char sha1[20];
 232
 233                        if (!prefixcmp(*pattern, "refs/") &&
 234                            resolve_ref(*pattern, sha1, 1, NULL)) {
 235                                if (!quiet)
 236                                        show_one(*pattern, sha1);
 237                        }
 238                        else if (!quiet)
 239                                die("'%s' - not a valid ref", *pattern);
 240                        else
 241                                return 1;
 242                        pattern++;
 243                }
 244                return 0;
 245        }
 246
 247        if (show_head)
 248                head_ref(show_ref, NULL);
 249        for_each_ref(show_ref, NULL);
 250        if (!found_match) {
 251                if (verify && !quiet)
 252                        die("No match");
 253                return 1;
 254        }
 255        return 0;
 256}