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
   7 static 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
   9 static 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;
  11 static const char **pattern;
  12
  13 static 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
  47 match:
  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
  90 static 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  */
 106 static 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
 143 int 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                                 printf("%s %s\n", sha1_to_hex(sha1),
 223                                        *pattern);
 224                         else if (!quiet)
 225                                 die("'%s' - not a valid ref", *pattern);
 226                         else
 227                                 return 1;
 228                         pattern++;
 229                 }
 230                 return 0;
 231         }
 232
 233         if (show_head)
 234                 head_ref(show_ref, NULL);
 235         for_each_ref(show_ref, NULL);
 236         if (!found_match) {
 237                 if (verify && !quiet)
 238                         die("No match");
 239                 return 1;
 240         }
 241         return 0;
 242 }