src/refdb.c

   1 /* Copyright (c) 2006-2014 Jonas Fonseca <jonas.fonseca@gmail.com>
   2  *
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License as
   5  * published by the Free Software Foundation; either version 2 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include "tig/tig.h"
  15 #include "tig/argv.h"
  16 #include "tig/util.h"
  17 #include "tig/io.h"
  18 #include "tig/options.h"
  19 #include "tig/repo.h"
  20 #include "tig/refdb.h"
  21
  22 static struct ref **refs = NULL;
  23 static size_t refs_size = 0;
  24 static struct ref *refs_head = NULL;
  25
  26 static struct ref_list **ref_lists = NULL;
  27 static size_t ref_lists_size = 0;
  28
  29 DEFINE_ALLOCATOR(realloc_refs, struct ref *, 256)
  30 DEFINE_ALLOCATOR(realloc_refs_list, struct ref *, 8)
  31 DEFINE_ALLOCATOR(realloc_ref_lists, struct ref_list *, 8)
  32
  33 static int
  34 compare_refs(const void *ref1_, const void *ref2_)
  35 {
  36         const struct ref *ref1 = *(const struct ref **)ref1_;
  37         const struct ref *ref2 = *(const struct ref **)ref2_;
  38
  39         return ref_compare(ref1, ref2);
  40 }
  41
  42 int
  43 ref_compare(const struct ref *ref1, const struct ref *ref2)
  44 {
  45         if (ref1->type != ref2->type)
  46                 return ref1->type - ref2->type;
  47         return strcmp_numeric(ref1->name, ref2->name);
  48 }
  49
  50 void
  51 foreach_ref(bool (*visitor)(void *data, const struct ref *ref), void *data)
  52 {
  53         size_t i;
  54
  55         for (i = 0; i < refs_size; i++)
  56                 if (refs[i]->id[0] && !visitor(data, refs[i]))
  57                         break;
  58 }
  59
  60 struct ref *
  61 get_ref_head()
  62 {
  63         return refs_head;
  64 }
  65
  66 struct ref_list *
  67 get_ref_list(const char *id)
  68 {
  69         struct ref_list *list;
  70         size_t i;
  71
  72         for (i = 0; i < ref_lists_size; i++)
  73                 if (!strcmp(id, ref_lists[i]->id))
  74                         return ref_lists[i];
  75
  76         if (!realloc_ref_lists(&ref_lists, ref_lists_size, 1))
  77                 return NULL;
  78         list = calloc(1, sizeof(*list));
  79         if (!list)
  80                 return NULL;
  81         string_copy_rev(list->id, id);
  82
  83         for (i = 0; i < refs_size; i++) {
  84                 if (!strcmp(id, refs[i]->id) &&
  85                     realloc_refs_list(&list->refs, list->size, 1))
  86                         list->refs[list->size++] = refs[i];
  87         }
  88
  89         if (!list->refs) {
  90                 free(list);
  91                 return NULL;
  92         }
  93
  94         qsort(list->refs, list->size, sizeof(*list->refs), compare_refs);
  95         ref_lists[ref_lists_size++] = list;
  96         return list;
  97 }
  98
  99 struct ref_opt {
 100         const char *remote;
 101         const char *head;
 102 };
 103
 104 static void
 105 done_ref_lists(void)
 106 {
 107         int i;
 108
 109         for (i = 0; i < ref_lists_size; i++) {
 110                 struct ref_list *list = ref_lists[i];
 111
 112                 free(list->refs);
 113                 free(list);
 114         }
 115
 116         free(ref_lists);
 117         ref_lists = NULL;
 118         ref_lists_size = 0;
 119 }
 120
 121 static int
 122 add_to_refs(const char *id, size_t idlen, char *name, size_t namelen, struct ref_opt *opt)
 123 {
 124         struct ref *ref = NULL;
 125         enum reference_type type = REFERENCE_BRANCH;
 126         int pos;
 127
 128         if (!prefixcmp(name, "refs/tags/")) {
 129                 type = REFERENCE_TAG;
 130                 if (!suffixcmp(name, namelen, "^{}")) {
 131                         namelen -= 3;
 132                         name[namelen] = 0;
 133                 } else {
 134                         type = REFERENCE_LOCAL_TAG;
 135                 }
 136
 137                 namelen -= STRING_SIZE("refs/tags/");
 138                 name    += STRING_SIZE("refs/tags/");
 139
 140         } else if (!prefixcmp(name, "refs/remotes/")) {
 141                 type = REFERENCE_REMOTE;
 142                 namelen -= STRING_SIZE("refs/remotes/");
 143                 name    += STRING_SIZE("refs/remotes/");
 144                 if (!strcmp(opt->remote, name))
 145                         type = REFERENCE_TRACKED_REMOTE;
 146
 147         } else if (!prefixcmp(name, "refs/replace/")) {
 148                 type = REFERENCE_REPLACE;
 149                 id      = name + strlen("refs/replace/");
 150                 idlen   = namelen - strlen("refs/replace/");
 151                 name    = "replaced";
 152                 namelen = strlen(name);
 153
 154         } else if (!prefixcmp(name, "refs/heads/")) {
 155                 namelen -= STRING_SIZE("refs/heads/");
 156                 name    += STRING_SIZE("refs/heads/");
 157                 if (strlen(opt->head) == namelen &&
 158                     !strncmp(opt->head, name, namelen))
 159                         type = REFERENCE_HEAD;
 160
 161         } else if (!strcmp(name, "HEAD")) {
 162                 /* Handle the case of HEAD not being a symbolic ref,
 163                  * i.e. during a rebase. */
 164                 if (*opt->head)
 165                         return OK;
 166                 type = REFERENCE_HEAD;
 167         }
 168
 169         /* If we are reloading or it's an annotated tag, replace the
 170          * previous SHA1 with the resolved commit id; relies on the fact
 171          * git-ls-remote lists the commit id of an annotated tag right
 172          * before the commit id it points to. */
 173         for (pos = 0; pos < refs_size; pos++) {
 174                 int cmp = type == REFERENCE_REPLACE
 175                         ? strcmp(id, refs[pos]->id) : strcmp(name, refs[pos]->name);
 176
 177                 if (!cmp) {
 178                         ref = refs[pos];
 179                         break;
 180                 }
 181         }
 182
 183         if (!ref) {
 184                 if (!realloc_refs(&refs, refs_size, 1))
 185                         return ERR;
 186                 ref = calloc(1, sizeof(*ref) + namelen);
 187                 if (!ref)
 188                         return ERR;
 189                 refs[refs_size++] = ref;
 190                 strncpy(ref->name, name, namelen);
 191         }
 192
 193         ref->valid = TRUE;
 194         ref->type = type;
 195         string_ncopy_do(ref->id, SIZEOF_REV, id, idlen);
 196
 197         if (type == REFERENCE_HEAD)
 198                 refs_head = ref;
 199         return OK;
 200 }
 201
 202 static int
 203 read_ref(char *id, size_t idlen, char *name, size_t namelen, void *data)
 204 {
 205         return add_to_refs(id, idlen, name, namelen, data);
 206 }
 207
 208 static int
 209 reload_refs(const char *git_dir, const char *remote_name, char *head, size_t headlen)
 210 {
 211         const char *head_argv[] = {
 212                 "git", "symbolic-ref", "HEAD", NULL
 213         };
 214         const char *ls_remote_argv[SIZEOF_ARG] = {
 215                 "git", "ls-remote", git_dir, NULL
 216         };
 217         static bool init = FALSE;
 218         struct ref_opt opt = { remote_name, head };
 219         size_t i;
 220
 221         if (!init) {
 222                 if (!argv_from_env(ls_remote_argv, "TIG_LS_REMOTE"))
 223                         return ERR;
 224                 init = TRUE;
 225         }
 226
 227         if (!*git_dir)
 228                 return OK;
 229
 230         if (!*head && io_run_buf(head_argv, head, headlen) &&
 231             !prefixcmp(head, "refs/heads/")) {
 232                 char *offset = head + STRING_SIZE("refs/heads/");
 233
 234                 memmove(head, offset, strlen(offset) + 1);
 235         }
 236
 237         refs_head = NULL;
 238         for (i = 0; i < refs_size; i++)
 239                 refs[i]->valid = 0;
 240
 241         done_ref_lists();
 242
 243         if (io_run_load(ls_remote_argv, "\t", read_ref, &opt) == ERR)
 244                 return ERR;
 245
 246         for (i = 0; i < refs_size; i++)
 247                 if (!refs[i]->valid)
 248                         refs[i]->id[0] = 0;
 249
 250         qsort(refs, refs_size, sizeof(*refs), compare_refs);
 251
 252         return OK;
 253 }
 254
 255 int
 256 load_refs(bool force)
 257 {
 258         static bool loaded = FALSE;
 259
 260         if (force)
 261                 repo.head[0] = 0;
 262         else if (loaded)
 263                 return OK;
 264
 265         loaded = TRUE;
 266         return reload_refs(repo.git_dir, repo.remote, repo.head, sizeof(repo.head));
 267 }
 268
 269 int
 270 add_ref(const char *id, char *name, const char *remote_name, const char *head)
 271 {
 272         struct ref_opt opt = { remote_name, head };
 273
 274         return add_to_refs(id, strlen(id), name, strlen(name), &opt);
 275 }
 276
 277 void
 278 ref_update_env(struct argv_env *env, const struct ref *ref, bool clear)
 279 {
 280         if (clear)
 281                 env->tag[0] = env->remote[0] = env->branch[0] = 0;
 282
 283         string_copy_rev(env->commit, ref->id);
 284
 285         if (ref_is_tag(ref)) {
 286                 string_copy_rev(env->tag, ref->name);
 287
 288         } else if (ref_is_remote(ref)) {
 289                 const char *sep = strchr(ref->name, '/');
 290
 291                 if (!sep)
 292                         return;
 293                 string_ncopy(env->remote, ref->name, sep - ref->name);
 294                 string_copy_rev(env->branch, sep + 1);
 295
 296         } else if (ref->type == REFERENCE_BRANCH) {
 297                 string_copy_rev(env->branch, ref->name);
 298         }
 299 }
 300
 301 static struct ref_format **ref_formats;
 302
 303 const struct ref_format *
 304 get_ref_format(struct ref *ref)
 305 {
 306         static const struct ref_format default_format = { "", "" };
 307
 308         if (ref_formats) {
 309                 struct ref_format *format = ref_formats[ref->type];
 310
 311                 if (!format && ref_is_tag(ref))
 312                         format = ref_formats[REFERENCE_TAG];
 313                 if (!format && ref_is_remote(ref))
 314                         format = ref_formats[REFERENCE_REMOTE];
 315                 if (!format)
 316                         format = ref_formats[REFERENCE_BRANCH];
 317                 if (format)
 318                         return format;
 319         }
 320
 321         return &default_format;
 322 }
 323
 324 static enum status_code
 325 parse_ref_format_arg(const char *arg, const struct enum_map *map)
 326 {
 327         size_t arglen = strlen(arg);
 328         const char *pos;
 329
 330         for (pos = arg; *pos && arglen > 0; pos++, arglen--) {
 331                 enum reference_type type;
 332
 333                 for (type = 0; type < map->size; type++) {
 334                         const struct enum_map_entry *entry = &map->entries[type];
 335                         struct ref_format *format;
 336
 337                         if (arglen < entry->namelen ||
 338                             string_enum_compare(pos, entry->name, entry->namelen))
 339                                 continue;
 340
 341                         format = malloc(sizeof(*format));
 342                         if (!format)
 343                                 return ERROR_OUT_OF_MEMORY;
 344                         format->start = strndup(arg, pos - arg);
 345                         format->end = strdup(pos + entry->namelen);
 346                         if (!format->start || !format->end) {
 347                                 free((void *) format->start);
 348                                 free((void *) format->end);
 349                                 free(format);
 350                                 return ERROR_OUT_OF_MEMORY;
 351                         }
 352
 353                         ref_formats[type] = format;
 354                         return SUCCESS;
 355                 }
 356         }
 357
 358         return error("Unknown ref format: %s", arg);
 359 }
 360
 361 enum status_code
 362 parse_ref_formats(const char *argv[])
 363 {
 364         const struct enum_map *map = reference_type_map;
 365         int argc;
 366
 367         if (!ref_formats) {
 368                 ref_formats = calloc(reference_type_map->size, sizeof(struct ref_format *));
 369                 if (!ref_formats)
 370                         return ERROR_OUT_OF_MEMORY;
 371         }
 372
 373         for (argc = 0; argv[argc]; argc++) {
 374                 enum status_code code = parse_ref_format_arg(argv[argc], map);
 375                 if (code != SUCCESS)
 376                         return code;
 377         }
 378
 379         return SUCCESS;
 380 }
 381
 382 /* vim: set ts=8 sw=8 noexpandtab: */