| 1 | #include "git-compat-util.h" |
| 2 | #include "hash.h" |
| 3 | #include "path.h" |
| 4 | #include "object-file.h" |
| 5 | #include "odb.h" |
| 6 | #include "odb/source-files.h" |
| 7 | #include "hex.h" |
| 8 | #include "repository.h" |
| 9 | #include "wrapper.h" |
| 10 | #include "gettext.h" |
| 11 | #include "loose.h" |
| 12 | #include "lockfile.h" |
| 13 | #include "oidtree.h" |
| 14 | |
| 15 | static const char *loose_object_header = "# loose-object-idx\n"; |
| 16 | |
| 17 | static inline int should_use_loose_object_map(struct repository *repo) |
| 18 | { |
| 19 | return repo->compat_hash_algo && repo->gitdir; |
| 20 | } |
| 21 | |
| 22 | void loose_object_map_init(struct loose_object_map **map) |
| 23 | { |
| 24 | struct loose_object_map *m; |
| 25 | m = xmalloc(sizeof(**map)); |
| 26 | m->to_compat = kh_init_oid_map(); |
| 27 | m->to_storage = kh_init_oid_map(); |
| 28 | *map = m; |
| 29 | } |
| 30 | |
| 31 | static int insert_oid_pair(kh_oid_map_t *map, const struct object_id *key, const struct object_id *value) |
| 32 | { |
| 33 | khiter_t pos; |
| 34 | int ret; |
| 35 | struct object_id *stored; |
| 36 | |
| 37 | pos = kh_put_oid_map(map, *key, &ret); |
| 38 | |
| 39 | /* This item already exists in the map. */ |
| 40 | if (ret == 0) |
| 41 | return 0; |
| 42 | |
| 43 | stored = xmalloc(sizeof(*stored)); |
| 44 | oidcpy(stored, value); |
| 45 | kh_value(map, pos) = stored; |
| 46 | return 1; |
| 47 | } |
| 48 | |
| 49 | static int insert_loose_map(struct odb_source_loose *loose, |
| 50 | const struct object_id *oid, |
| 51 | const struct object_id *compat_oid) |
| 52 | { |
| 53 | struct loose_object_map *map = loose->map; |
| 54 | int inserted = 0; |
| 55 | |
| 56 | inserted |= insert_oid_pair(map->to_compat, oid, compat_oid); |
| 57 | inserted |= insert_oid_pair(map->to_storage, compat_oid, oid); |
| 58 | if (inserted) |
| 59 | oidtree_insert(loose->cache, compat_oid, NULL); |
| 60 | |
| 61 | return inserted; |
| 62 | } |
| 63 | |
| 64 | static int load_one_loose_object_map(struct repository *repo, struct odb_source_loose *loose) |
| 65 | { |
| 66 | struct strbuf buf = STRBUF_INIT, path = STRBUF_INIT; |
| 67 | FILE *fp; |
| 68 | |
| 69 | if (!loose->map) |
| 70 | loose_object_map_init(&loose->map); |
| 71 | if (!loose->cache) { |
| 72 | ALLOC_ARRAY(loose->cache, 1); |
| 73 | oidtree_init(loose->cache); |
| 74 | } |
| 75 | |
| 76 | insert_loose_map(loose, repo->hash_algo->empty_tree, repo->compat_hash_algo->empty_tree); |
| 77 | insert_loose_map(loose, repo->hash_algo->empty_blob, repo->compat_hash_algo->empty_blob); |
| 78 | insert_loose_map(loose, repo->hash_algo->null_oid, repo->compat_hash_algo->null_oid); |
| 79 | |
| 80 | repo_common_path_replace(repo, &path, "objects/loose-object-idx"); |
| 81 | fp = fopen(path.buf, "rb"); |
| 82 | if (!fp) { |
| 83 | strbuf_release(&path); |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | errno = 0; |
| 88 | if (strbuf_getwholeline(&buf, fp, '\n') || strcmp(buf.buf, loose_object_header)) |
| 89 | goto err; |
| 90 | while (!strbuf_getline_lf(&buf, fp)) { |
| 91 | const char *p; |
| 92 | struct object_id oid, compat_oid; |
| 93 | if (parse_oid_hex_algop(buf.buf, &oid, &p, repo->hash_algo) || |
| 94 | *p++ != ' ' || |
| 95 | parse_oid_hex_algop(p, &compat_oid, &p, repo->compat_hash_algo) || |
| 96 | p != buf.buf + buf.len) |
| 97 | goto err; |
| 98 | insert_loose_map(loose, &oid, &compat_oid); |
| 99 | } |
| 100 | |
| 101 | strbuf_release(&buf); |
| 102 | strbuf_release(&path); |
| 103 | return errno ? -1 : 0; |
| 104 | err: |
| 105 | strbuf_release(&buf); |
| 106 | strbuf_release(&path); |
| 107 | return -1; |
| 108 | } |
| 109 | |
| 110 | int repo_read_loose_object_map(struct repository *repo) |
| 111 | { |
| 112 | struct odb_source *source; |
| 113 | |
| 114 | if (!should_use_loose_object_map(repo)) |
| 115 | return 0; |
| 116 | |
| 117 | odb_prepare_alternates(repo->objects); |
| 118 | |
| 119 | for (source = repo->objects->sources; source; source = source->next) { |
| 120 | struct odb_source_files *files = odb_source_files_downcast(source); |
| 121 | if (load_one_loose_object_map(repo, files->loose) < 0) { |
| 122 | return -1; |
| 123 | } |
| 124 | } |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | int repo_write_loose_object_map(struct repository *repo) |
| 129 | { |
| 130 | struct odb_source_files *files = odb_source_files_downcast(repo->objects->sources); |
| 131 | kh_oid_map_t *map = files->loose->map->to_compat; |
| 132 | struct lock_file lock; |
| 133 | int fd; |
| 134 | khiter_t iter; |
| 135 | struct strbuf buf = STRBUF_INIT, path = STRBUF_INIT; |
| 136 | |
| 137 | if (!should_use_loose_object_map(repo)) |
| 138 | return 0; |
| 139 | |
| 140 | repo_common_path_replace(repo, &path, "objects/loose-object-idx"); |
| 141 | fd = hold_lock_file_for_update_timeout(&lock, path.buf, LOCK_DIE_ON_ERROR, -1); |
| 142 | iter = kh_begin(map); |
| 143 | if (write_in_full(fd, loose_object_header, strlen(loose_object_header)) < 0) |
| 144 | goto errout; |
| 145 | |
| 146 | for (; iter != kh_end(map); iter++) { |
| 147 | if (kh_exist(map, iter)) { |
| 148 | if (oideq(&kh_key(map, iter), repo->hash_algo->empty_tree) || |
| 149 | oideq(&kh_key(map, iter), repo->hash_algo->empty_blob)) |
| 150 | continue; |
| 151 | strbuf_addf(&buf, "%s %s\n", oid_to_hex(&kh_key(map, iter)), oid_to_hex(kh_value(map, iter))); |
| 152 | if (write_in_full(fd, buf.buf, buf.len) < 0) |
| 153 | goto errout; |
| 154 | strbuf_reset(&buf); |
| 155 | } |
| 156 | } |
| 157 | strbuf_release(&buf); |
| 158 | if (commit_lock_file(&lock) < 0) { |
| 159 | error_errno(_("could not write loose object index %s"), path.buf); |
| 160 | strbuf_release(&path); |
| 161 | return -1; |
| 162 | } |
| 163 | strbuf_release(&path); |
| 164 | return 0; |
| 165 | errout: |
| 166 | rollback_lock_file(&lock); |
| 167 | strbuf_release(&buf); |
| 168 | error_errno(_("failed to write loose object index %s"), path.buf); |
| 169 | strbuf_release(&path); |
| 170 | return -1; |
| 171 | } |
| 172 | |
| 173 | static int write_one_object(struct odb_source_loose *loose, |
| 174 | const struct object_id *oid, |
| 175 | const struct object_id *compat_oid) |
| 176 | { |
| 177 | struct lock_file lock; |
| 178 | int fd; |
| 179 | struct stat st; |
| 180 | struct strbuf buf = STRBUF_INIT, path = STRBUF_INIT; |
| 181 | |
| 182 | strbuf_addf(&path, "%s/loose-object-idx", loose->base.path); |
| 183 | hold_lock_file_for_update_timeout(&lock, path.buf, LOCK_DIE_ON_ERROR, -1); |
| 184 | |
| 185 | fd = open(path.buf, O_WRONLY | O_CREAT | O_APPEND, 0666); |
| 186 | if (fd < 0) |
| 187 | goto errout; |
| 188 | if (fstat(fd, &st) < 0) |
| 189 | goto errout; |
| 190 | if (!st.st_size && write_in_full(fd, loose_object_header, strlen(loose_object_header)) < 0) |
| 191 | goto errout; |
| 192 | |
| 193 | strbuf_addf(&buf, "%s %s\n", oid_to_hex(oid), oid_to_hex(compat_oid)); |
| 194 | if (write_in_full(fd, buf.buf, buf.len) < 0) |
| 195 | goto errout; |
| 196 | if (close(fd)) |
| 197 | goto errout; |
| 198 | adjust_shared_perm(loose->base.odb->repo, path.buf); |
| 199 | rollback_lock_file(&lock); |
| 200 | strbuf_release(&buf); |
| 201 | strbuf_release(&path); |
| 202 | return 0; |
| 203 | errout: |
| 204 | error_errno(_("failed to write loose object index %s"), path.buf); |
| 205 | close(fd); |
| 206 | rollback_lock_file(&lock); |
| 207 | strbuf_release(&buf); |
| 208 | strbuf_release(&path); |
| 209 | return -1; |
| 210 | } |
| 211 | |
| 212 | int repo_add_loose_object_map(struct odb_source_loose *loose, |
| 213 | const struct object_id *oid, |
| 214 | const struct object_id *compat_oid) |
| 215 | { |
| 216 | int inserted = 0; |
| 217 | |
| 218 | if (!should_use_loose_object_map(loose->base.odb->repo)) |
| 219 | return 0; |
| 220 | |
| 221 | inserted = insert_loose_map(loose, oid, compat_oid); |
| 222 | if (inserted) |
| 223 | return write_one_object(loose, oid, compat_oid); |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | int repo_loose_object_map_oid(struct repository *repo, |
| 228 | const struct object_id *src, |
| 229 | const struct git_hash_algo *to, |
| 230 | struct object_id *dest) |
| 231 | { |
| 232 | struct odb_source *source; |
| 233 | kh_oid_map_t *map; |
| 234 | khiter_t pos; |
| 235 | |
| 236 | for (source = repo->objects->sources; source; source = source->next) { |
| 237 | struct odb_source_files *files = odb_source_files_downcast(source); |
| 238 | struct loose_object_map *loose_map = files->loose->map; |
| 239 | if (!loose_map) |
| 240 | continue; |
| 241 | map = (to == repo->compat_hash_algo) ? |
| 242 | loose_map->to_compat : |
| 243 | loose_map->to_storage; |
| 244 | pos = kh_get_oid_map(map, *src); |
| 245 | if (pos < kh_end(map)) { |
| 246 | oidcpy(dest, kh_value(map, pos)); |
| 247 | return 0; |
| 248 | } |
| 249 | } |
| 250 | return -1; |
| 251 | } |
| 252 | |
| 253 | void loose_object_map_clear(struct loose_object_map **map) |
| 254 | { |
| 255 | struct loose_object_map *m = *map; |
| 256 | struct object_id *oid; |
| 257 | |
| 258 | if (!m) |
| 259 | return; |
| 260 | |
| 261 | kh_foreach_value(m->to_compat, oid, free(oid)); |
| 262 | kh_foreach_value(m->to_storage, oid, free(oid)); |
| 263 | kh_destroy_oid_map(m->to_compat); |
| 264 | kh_destroy_oid_map(m->to_storage); |
| 265 | free(m); |
| 266 | *map = NULL; |
| 267 | } |