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 "path-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                        hex = find_unique_abbrev(obj->sha1, abbrev);
  90                        printf("%s %s^{}\n", hex, refname);
  91                }
  92        }
  93        return 0;
  94}
  95
  96static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  97{
  98        struct path_list *list = (struct path_list *)cbdata;
  99        path_list_insert(refname, list);
 100        return 0;
 101}
 102
 103/*
 104 * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
 105 * and
 106 * (1) strip "^{}" at the end of line if any;
 107 * (2) ignore if match is provided and does not head-match refname;
 108 * (3) warn if refname is not a well-formed refname and skip;
 109 * (4) ignore if refname is a ref that exists in the local repository;
 110 * (5) otherwise output the line.
 111 */
 112static int exclude_existing(const char *match)
 113{
 114        static struct path_list existing_refs = { NULL, 0, 0, 0 };
 115        char buf[1024];
 116        int matchlen = match ? strlen(match) : 0;
 117
 118        for_each_ref(add_existing, &existing_refs);
 119        while (fgets(buf, sizeof(buf), stdin)) {
 120                char *ref;
 121                int len = strlen(buf);
 122
 123                if (len > 0 && buf[len - 1] == '\n')
 124                        buf[--len] = '\0';
 125                if (3 <= len && !strcmp(buf + len - 3, "^{}")) {
 126                        len -= 3;
 127                        buf[len] = '\0';
 128                }
 129                for (ref = buf + len; buf < ref; ref--)
 130                        if (isspace(ref[-1]))
 131                                break;
 132                if (match) {
 133                        int reflen = buf + len - ref;
 134                        if (reflen < matchlen)
 135                                continue;
 136                        if (strncmp(ref, match, matchlen))
 137                                continue;
 138                }
 139                if (check_ref_format(ref)) {
 140                        fprintf(stderr, "warning: ref '%s' ignored\n", ref);
 141                        continue;
 142                }
 143                if (!path_list_has_path(&existing_refs, ref)) {
 144                        printf("%s\n", buf);
 145                }
 146        }
 147        return 0;
 148}
 149
 150int cmd_show_ref(int argc, const char **argv, const char *prefix)
 151{
 152        int i;
 153
 154        for (i = 1; i < argc; i++) {
 155                const char *arg = argv[i];
 156                if (*arg != '-') {
 157                        pattern = argv + i;
 158                        break;
 159                }
 160                if (!strcmp(arg, "--")) {
 161                        pattern = argv + i + 1;
 162                        if (!*pattern)
 163                                pattern = NULL;
 164                        break;
 165                }
 166                if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 167                        quiet = 1;
 168                        continue;
 169                }
 170                if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 171                        show_head = 1;
 172                        continue;
 173                }
 174                if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 175                        deref_tags = 1;
 176                        continue;
 177                }
 178                if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 179                        hash_only = 1;
 180                        continue;
 181                }
 182                if (!prefixcmp(arg, "--hash=") ||
 183                    (!prefixcmp(arg, "--abbrev") &&
 184                     (arg[8] == '=' || arg[8] == '\0'))) {
 185                        if (arg[2] != 'h' && !arg[8])
 186                                /* --abbrev only */
 187                                abbrev = DEFAULT_ABBREV;
 188                        else {
 189                                /* --hash= or --abbrev= */
 190                                char *end;
 191                                if (arg[2] == 'h') {
 192                                        hash_only = 1;
 193                                        arg += 7;
 194                                }
 195                                else
 196                                        arg += 9;
 197                                abbrev = strtoul(arg, &end, 10);
 198                                if (*end || abbrev > 40)
 199                                        usage(show_ref_usage);
 200                                if (abbrev < MINIMUM_ABBREV)
 201                                        abbrev = MINIMUM_ABBREV;
 202                        }
 203                        continue;
 204                }
 205                if (!strcmp(arg, "--verify")) {
 206                        verify = 1;
 207                        continue;
 208                }
 209                if (!strcmp(arg, "--tags")) {
 210                        tags_only = 1;
 211                        continue;
 212                }
 213                if (!strcmp(arg, "--heads")) {
 214                        heads_only = 1;
 215                        continue;
 216                }
 217                if (!strcmp(arg, "--exclude-existing"))
 218                        return exclude_existing(NULL);
 219                if (!prefixcmp(arg, "--exclude-existing="))
 220                        return exclude_existing(arg + 19);
 221                usage(show_ref_usage);
 222        }
 223
 224        if (verify) {
 225                if (!pattern)
 226                        die("--verify requires a reference");
 227                while (*pattern) {
 228                        unsigned char sha1[20];
 229
 230                        if (!prefixcmp(*pattern, "refs/") &&
 231                            resolve_ref(*pattern, sha1, 1, NULL)) {
 232                                if (!quiet)
 233                                        show_one(*pattern, sha1);
 234                        }
 235                        else if (!quiet)
 236                                die("'%s' - not a valid ref", *pattern);
 237                        else
 238                                return 1;
 239                        pattern++;
 240                }
 241                return 0;
 242        }
 243
 244        if (show_head)
 245                head_ref(show_ref, NULL);
 246        for_each_ref(show_ref, NULL);
 247        if (!found_match) {
 248                if (verify && !quiet)
 249                        die("No match");
 250                return 1;
 251        }
 252        return 0;
 253}