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

   1#include "cache.h"
   2#include "refs.h"
   3#include "object.h"
   4#include "tag.h"
   5#include "path-list.h"
   6
   7static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--dereference] [-s|--hash[=<length>]] [--abbrev[=<length>]] [--tags] [--heads] [--] [pattern*] | --filter-invalid < ref-list";
   8
   9static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0,
  10        found_match = 0, verify = 0, quiet = 0, hash_only = 0, abbrev = 0;
  11static const char **pattern;
  12
  13static int show_ref(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  14{
  15        struct object *obj;
  16        const char *hex;
  17        unsigned char peeled[20];
  18
  19        if (tags_only || heads_only) {
  20                int match;
  21
  22                match = heads_only && !strncmp(refname, "refs/heads/", 11);
  23                match |= tags_only && !strncmp(refname, "refs/tags/", 10);
  24                if (!match)
  25                        return 0;
  26        }
  27        if (pattern) {
  28                int reflen = strlen(refname);
  29                const char **p = pattern, *m;
  30                while ((m = *p++) != NULL) {
  31                        int len = strlen(m);
  32                        if (len > reflen)
  33                                continue;
  34                        if (memcmp(m, refname + reflen - len, len))
  35                                continue;
  36                        if (len == reflen)
  37                                goto match;
  38                        /* "--verify" requires an exact match */
  39                        if (verify)
  40                                continue;
  41                        if (refname[reflen - len - 1] == '/')
  42                                goto match;
  43                }
  44                return 0;
  45        }
  46
  47match:
  48        found_match++;
  49
  50        /* This changes the semantics slightly that even under quiet we
  51         * detect and return error if the repository is corrupt and
  52         * ref points at a nonexistent object.
  53         */
  54        if (!has_sha1_file(sha1))
  55                die("git-show-ref: bad ref %s (%s)", refname,
  56                    sha1_to_hex(sha1));
  57
  58        if (quiet)
  59                return 0;
  60
  61        hex = find_unique_abbrev(sha1, abbrev);
  62        if (hash_only)
  63                printf("%s\n", hex);
  64        else
  65                printf("%s %s\n", hex, refname);
  66
  67        if (!deref_tags)
  68                return 0;
  69
  70        if ((flag & REF_ISPACKED) && !peel_ref(refname, peeled)) {
  71                if (!is_null_sha1(peeled)) {
  72                        hex = find_unique_abbrev(peeled, abbrev);
  73                        printf("%s %s^{}\n", hex, refname);
  74                }
  75        }
  76        else {
  77                obj = parse_object(sha1);
  78                if (!obj)
  79                        die("git-show-ref: bad ref %s (%s)", refname,
  80                            sha1_to_hex(sha1));
  81                if (obj->type == OBJ_TAG) {
  82                        obj = deref_tag(obj, refname, 0);
  83                        hex = find_unique_abbrev(obj->sha1, abbrev);
  84                        printf("%s %s^{}\n", hex, refname);
  85                }
  86        }
  87        return 0;
  88}
  89
  90static int add_existing(const char *refname, const unsigned char *sha1, int flag, void *cbdata)
  91{
  92        struct path_list *list = (struct path_list *)cbdata;
  93        path_list_insert(refname, list);
  94        return 0;
  95}
  96
  97/*
  98 * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
  99 * and
 100 * (1) strip "^{}" at the end of line if any;
 101 * (2) ignore if match is provided and does not head-match refname;
 102 * (3) warn if refname is not a well-formed refname and skip;
 103 * (4) ignore if refname is a ref that exists in the local repository;
 104 * (5) otherwise output the line.
 105 */
 106static int exclude_existing(const char *match)
 107{
 108        static struct path_list existing_refs = { NULL, 0, 0, 0 };
 109        char buf[1024];
 110        int matchlen = match ? strlen(match) : 0;
 111
 112        for_each_ref(add_existing, &existing_refs);
 113        while (fgets(buf, sizeof(buf), stdin)) {
 114                int len = strlen(buf);
 115                char *ref;
 116                if (len > 0 && buf[len - 1] == '\n')
 117                        buf[--len] = '\0';
 118                if (!strcmp(buf + len - 3, "^{}")) {
 119                        len -= 3;
 120                        buf[len] = '\0';
 121                }
 122                for (ref = buf + len; buf < ref; ref--)
 123                        if (isspace(ref[-1]))
 124                                break;
 125                if (match) {
 126                        int reflen = buf + len - ref;
 127                        if (reflen < matchlen)
 128                                continue;
 129                        if (strncmp(ref, match, matchlen))
 130                                continue;
 131                }
 132                if (check_ref_format(ref)) {
 133                        fprintf(stderr, "warning: ref '%s' ignored\n", ref);
 134                        continue;
 135                }
 136                if (!path_list_has_path(&existing_refs, ref)) {
 137                        printf("%s\n", buf);
 138                }
 139        }
 140        return 0;
 141}
 142
 143int cmd_show_ref(int argc, const char **argv, const char *prefix)
 144{
 145        int i;
 146
 147        for (i = 1; i < argc; i++) {
 148                const char *arg = argv[i];
 149                if (*arg != '-') {
 150                        pattern = argv + i;
 151                        break;
 152                }
 153                if (!strcmp(arg, "--")) {
 154                        pattern = argv + i + 1;
 155                        if (!*pattern)
 156                                pattern = NULL;
 157                        break;
 158                }
 159                if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 160                        quiet = 1;
 161                        continue;
 162                }
 163                if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) {
 164                        show_head = 1;
 165                        continue;
 166                }
 167                if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) {
 168                        deref_tags = 1;
 169                        continue;
 170                }
 171                if (!strcmp(arg, "-s") || !strcmp(arg, "--hash")) {
 172                        hash_only = 1;
 173                        continue;
 174                }
 175                if (!strncmp(arg, "--hash=", 7) ||
 176                    (!strncmp(arg, "--abbrev", 8) &&
 177                     (arg[8] == '=' || arg[8] == '\0'))) {
 178                        if (arg[3] != 'h' && !arg[8])
 179                                /* --abbrev only */
 180                                abbrev = DEFAULT_ABBREV;
 181                        else {
 182                                /* --hash= or --abbrev= */
 183                                char *end;
 184                                if (arg[3] == 'h') {
 185                                        hash_only = 1;
 186                                        arg += 7;
 187                                }
 188                                else
 189                                        arg += 9;
 190                                abbrev = strtoul(arg, &end, 10);
 191                                if (*end || abbrev > 40)
 192                                        usage(show_ref_usage);
 193                                if (abbrev < MINIMUM_ABBREV)
 194                                        abbrev = MINIMUM_ABBREV;
 195                        }
 196                        continue;
 197                }
 198                if (!strcmp(arg, "--verify")) {
 199                        verify = 1;
 200                        continue;
 201                }
 202                if (!strcmp(arg, "--tags")) {
 203                        tags_only = 1;
 204                        continue;
 205                }
 206                if (!strcmp(arg, "--heads")) {
 207                        heads_only = 1;
 208                        continue;
 209                }
 210                if (!strcmp(arg, "--exclude-existing"))
 211                        return exclude_existing(NULL);
 212                if (!strncmp(arg, "--exclude-existing=", 19))
 213                        return exclude_existing(arg + 19);
 214                usage(show_ref_usage);
 215        }
 216
 217        if (verify) {
 218                unsigned char sha1[20];
 219
 220                while (*pattern) {
 221                        if (resolve_ref(*pattern, sha1, 1, NULL)) {
 222                                if (!quiet)
 223                                        printf("%s %s\n",
 224                                               sha1_to_hex(sha1), *pattern);
 225                        }
 226                        else if (!quiet)
 227                                die("'%s' - not a valid ref", *pattern);
 228                        else
 229                                return 1;
 230                        pattern++;
 231                }
 232                return 0;
 233        }
 234
 235        if (show_head)
 236                head_ref(show_ref, NULL);
 237        for_each_ref(show_ref, NULL);
 238        if (!found_match) {
 239                if (verify && !quiet)
 240                        die("No match");
 241                return 1;
 242        }
 243        return 0;
 244}