| 1 | #include "git-compat-util.h" |
| 2 | #include "abspath.h" |
| 3 | #include "chdir-notify.h" |
| 4 | #include "gettext.h" |
| 5 | #include "hex.h" |
| 6 | #include "loose.h" |
| 7 | #include "object-file.h" |
| 8 | #include "object-file-convert.h" |
| 9 | #include "odb.h" |
| 10 | #include "odb/source-files.h" |
| 11 | #include "odb/source-loose.h" |
| 12 | #include "odb/streaming.h" |
| 13 | #include "oidtree.h" |
| 14 | #include "repository.h" |
| 15 | #include "strbuf.h" |
| 16 | |
| 17 | static int append_loose_object(const struct object_id *oid, |
| 18 | const char *path UNUSED, |
| 19 | void *data) |
| 20 | { |
| 21 | oidtree_insert(data, oid, NULL); |
| 22 | return 0; |
| 23 | } |
| 24 | |
| 25 | static struct oidtree *odb_source_loose_cache(struct odb_source_loose *loose, |
| 26 | const struct object_id *oid) |
| 27 | { |
| 28 | int subdir_nr = oid->hash[0]; |
| 29 | struct strbuf buf = STRBUF_INIT; |
| 30 | size_t word_bits = bitsizeof(loose->subdir_seen[0]); |
| 31 | size_t word_index = subdir_nr / word_bits; |
| 32 | size_t mask = (size_t)1u << (subdir_nr % word_bits); |
| 33 | uint32_t *bitmap; |
| 34 | |
| 35 | if (subdir_nr < 0 || |
| 36 | (size_t) subdir_nr >= bitsizeof(loose->subdir_seen)) |
| 37 | BUG("subdir_nr out of range"); |
| 38 | |
| 39 | bitmap = &loose->subdir_seen[word_index]; |
| 40 | if (*bitmap & mask) |
| 41 | return loose->cache; |
| 42 | if (!loose->cache) { |
| 43 | ALLOC_ARRAY(loose->cache, 1); |
| 44 | oidtree_init(loose->cache); |
| 45 | } |
| 46 | strbuf_addstr(&buf, loose->base.path); |
| 47 | for_each_file_in_obj_subdir(subdir_nr, &buf, |
| 48 | loose->base.odb->repo->hash_algo, |
| 49 | append_loose_object, |
| 50 | NULL, NULL, |
| 51 | loose->cache); |
| 52 | *bitmap |= mask; |
| 53 | strbuf_release(&buf); |
| 54 | return loose->cache; |
| 55 | } |
| 56 | |
| 57 | static int quick_has_loose(struct odb_source_loose *loose, |
| 58 | const struct object_id *oid) |
| 59 | { |
| 60 | return !!oidtree_contains(odb_source_loose_cache(loose, oid), oid); |
| 61 | } |
| 62 | |
| 63 | static int read_object_info_from_path(struct odb_source_loose *loose, |
| 64 | const char *path, |
| 65 | const struct object_id *oid, |
| 66 | struct object_info *oi, |
| 67 | enum object_info_flags flags) |
| 68 | { |
| 69 | int ret; |
| 70 | int fd; |
| 71 | unsigned long mapsize; |
| 72 | void *map = NULL; |
| 73 | git_zstream stream, *stream_to_end = NULL; |
| 74 | char hdr[MAX_HEADER_LEN]; |
| 75 | unsigned long size_scratch; |
| 76 | enum object_type type_scratch; |
| 77 | struct stat st; |
| 78 | |
| 79 | /* |
| 80 | * If we don't care about type or size, then we don't |
| 81 | * need to look inside the object at all. Note that we |
| 82 | * do not optimize out the stat call, even if the |
| 83 | * caller doesn't care about the disk-size, since our |
| 84 | * return value implicitly indicates whether the |
| 85 | * object even exists. |
| 86 | */ |
| 87 | if (!oi || (!oi->typep && !oi->sizep && !oi->contentp)) { |
| 88 | struct stat st; |
| 89 | |
| 90 | if ((!oi || (!oi->disk_sizep && !oi->mtimep)) && (flags & OBJECT_INFO_QUICK)) { |
| 91 | ret = quick_has_loose(loose, oid) ? 0 : -1; |
| 92 | goto out; |
| 93 | } |
| 94 | |
| 95 | if (lstat(path, &st) < 0) { |
| 96 | ret = -1; |
| 97 | goto out; |
| 98 | } |
| 99 | |
| 100 | if (oi) { |
| 101 | if (oi->disk_sizep) |
| 102 | *oi->disk_sizep = st.st_size; |
| 103 | if (oi->mtimep) |
| 104 | *oi->mtimep = st.st_mtime; |
| 105 | } |
| 106 | |
| 107 | ret = 0; |
| 108 | goto out; |
| 109 | } |
| 110 | |
| 111 | fd = git_open(path); |
| 112 | if (fd < 0) { |
| 113 | if (errno != ENOENT) |
| 114 | error_errno(_("unable to open loose object %s"), oid_to_hex(oid)); |
| 115 | ret = -1; |
| 116 | goto out; |
| 117 | } |
| 118 | |
| 119 | if (fstat(fd, &st)) { |
| 120 | close(fd); |
| 121 | ret = -1; |
| 122 | goto out; |
| 123 | } |
| 124 | |
| 125 | mapsize = xsize_t(st.st_size); |
| 126 | if (!mapsize) { |
| 127 | close(fd); |
| 128 | ret = error(_("object file %s is empty"), path); |
| 129 | goto out; |
| 130 | } |
| 131 | |
| 132 | map = xmmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0); |
| 133 | close(fd); |
| 134 | if (!map) { |
| 135 | ret = -1; |
| 136 | goto out; |
| 137 | } |
| 138 | |
| 139 | if (oi->disk_sizep) |
| 140 | *oi->disk_sizep = mapsize; |
| 141 | if (oi->mtimep) |
| 142 | *oi->mtimep = st.st_mtime; |
| 143 | |
| 144 | stream_to_end = &stream; |
| 145 | |
| 146 | switch (unpack_loose_header(&stream, map, mapsize, hdr, sizeof(hdr))) { |
| 147 | case ULHR_OK: |
| 148 | if (!oi->sizep) |
| 149 | oi->sizep = &size_scratch; |
| 150 | if (!oi->typep) |
| 151 | oi->typep = &type_scratch; |
| 152 | |
| 153 | if (parse_loose_header(hdr, oi) < 0) { |
| 154 | ret = error(_("unable to parse %s header"), oid_to_hex(oid)); |
| 155 | goto corrupt; |
| 156 | } |
| 157 | |
| 158 | if (*oi->typep < 0) |
| 159 | die(_("invalid object type")); |
| 160 | |
| 161 | if (oi->contentp) { |
| 162 | *oi->contentp = unpack_loose_rest(&stream, hdr, *oi->sizep, oid); |
| 163 | if (!*oi->contentp) { |
| 164 | ret = -1; |
| 165 | goto corrupt; |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | break; |
| 170 | case ULHR_BAD: |
| 171 | ret = error(_("unable to unpack %s header"), |
| 172 | oid_to_hex(oid)); |
| 173 | goto corrupt; |
| 174 | case ULHR_TOO_LONG: |
| 175 | ret = error(_("header for %s too long, exceeds %d bytes"), |
| 176 | oid_to_hex(oid), MAX_HEADER_LEN); |
| 177 | goto corrupt; |
| 178 | } |
| 179 | |
| 180 | ret = 0; |
| 181 | |
| 182 | corrupt: |
| 183 | if (ret && (flags & OBJECT_INFO_DIE_IF_CORRUPT)) |
| 184 | die(_("loose object %s (stored in %s) is corrupt"), |
| 185 | oid_to_hex(oid), path); |
| 186 | |
| 187 | out: |
| 188 | if (stream_to_end) |
| 189 | git_inflate_end(stream_to_end); |
| 190 | if (map) |
| 191 | munmap(map, mapsize); |
| 192 | if (oi) { |
| 193 | if (oi->sizep == &size_scratch) |
| 194 | oi->sizep = NULL; |
| 195 | if (oi->typep == &type_scratch) |
| 196 | oi->typep = NULL; |
| 197 | if (oi->delta_base_oid) |
| 198 | oidclr(oi->delta_base_oid, loose->base.odb->repo->hash_algo); |
| 199 | if (!ret) |
| 200 | oi->whence = OI_LOOSE; |
| 201 | } |
| 202 | |
| 203 | return ret; |
| 204 | } |
| 205 | |
| 206 | static int odb_source_loose_read_object_info(struct odb_source *source, |
| 207 | const struct object_id *oid, |
| 208 | struct object_info *oi, |
| 209 | enum object_info_flags flags) |
| 210 | { |
| 211 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 212 | static struct strbuf buf = STRBUF_INIT; |
| 213 | |
| 214 | /* |
| 215 | * The second read shouldn't cause new loose objects to show up, unless |
| 216 | * there was a race condition with a secondary process. We don't care |
| 217 | * about this case though, so we simply skip reading loose objects a |
| 218 | * second time. |
| 219 | */ |
| 220 | if (flags & OBJECT_INFO_SECOND_READ) |
| 221 | return -1; |
| 222 | |
| 223 | odb_loose_path(loose, &buf, oid); |
| 224 | return read_object_info_from_path(loose, buf.buf, oid, oi, flags); |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * Find "oid" as a loose object in given source, open the object and return its |
| 229 | * file descriptor. Returns the file descriptor on success, negative on failure. |
| 230 | * |
| 231 | * The "path" out-parameter will give the path of the object we found (if any). |
| 232 | * Note that it may point to static storage and is only valid until another |
| 233 | * call to open_loose_object(). |
| 234 | */ |
| 235 | static int open_loose_object(struct odb_source_loose *loose, |
| 236 | const struct object_id *oid, const char **path) |
| 237 | { |
| 238 | static struct strbuf buf = STRBUF_INIT; |
| 239 | int fd; |
| 240 | |
| 241 | *path = odb_loose_path(loose, &buf, oid); |
| 242 | fd = git_open(*path); |
| 243 | if (fd >= 0) |
| 244 | return fd; |
| 245 | |
| 246 | return -1; |
| 247 | } |
| 248 | |
| 249 | static void *odb_source_loose_map_object(struct odb_source_loose *loose, |
| 250 | const struct object_id *oid, |
| 251 | unsigned long *size) |
| 252 | { |
| 253 | const char *p; |
| 254 | int fd = open_loose_object(loose, oid, &p); |
| 255 | void *map = NULL; |
| 256 | struct stat st; |
| 257 | |
| 258 | if (fd < 0) |
| 259 | return NULL; |
| 260 | |
| 261 | if (!fstat(fd, &st)) { |
| 262 | *size = xsize_t(st.st_size); |
| 263 | if (!*size) { |
| 264 | /* mmap() is forbidden on empty files */ |
| 265 | error(_("object file %s is empty"), p); |
| 266 | goto out; |
| 267 | } |
| 268 | |
| 269 | map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0); |
| 270 | } |
| 271 | |
| 272 | out: |
| 273 | close(fd); |
| 274 | return map; |
| 275 | } |
| 276 | |
| 277 | struct odb_loose_read_stream { |
| 278 | struct odb_read_stream base; |
| 279 | git_zstream z; |
| 280 | enum { |
| 281 | ODB_LOOSE_READ_STREAM_INUSE, |
| 282 | ODB_LOOSE_READ_STREAM_DONE, |
| 283 | ODB_LOOSE_READ_STREAM_ERROR, |
| 284 | } z_state; |
| 285 | void *mapped; |
| 286 | unsigned long mapsize; |
| 287 | char hdr[32]; |
| 288 | int hdr_avail; |
| 289 | int hdr_used; |
| 290 | }; |
| 291 | |
| 292 | static ssize_t read_istream_loose(struct odb_read_stream *_st, char *buf, size_t sz) |
| 293 | { |
| 294 | struct odb_loose_read_stream *st = |
| 295 | container_of(_st, struct odb_loose_read_stream, base); |
| 296 | size_t total_read = 0; |
| 297 | |
| 298 | switch (st->z_state) { |
| 299 | case ODB_LOOSE_READ_STREAM_DONE: |
| 300 | return 0; |
| 301 | case ODB_LOOSE_READ_STREAM_ERROR: |
| 302 | return -1; |
| 303 | default: |
| 304 | break; |
| 305 | } |
| 306 | |
| 307 | if (st->hdr_used < st->hdr_avail) { |
| 308 | size_t to_copy = st->hdr_avail - st->hdr_used; |
| 309 | if (sz < to_copy) |
| 310 | to_copy = sz; |
| 311 | memcpy(buf, st->hdr + st->hdr_used, to_copy); |
| 312 | st->hdr_used += to_copy; |
| 313 | total_read += to_copy; |
| 314 | } |
| 315 | |
| 316 | while (total_read < sz) { |
| 317 | int status; |
| 318 | |
| 319 | st->z.next_out = (unsigned char *)buf + total_read; |
| 320 | st->z.avail_out = sz - total_read; |
| 321 | status = git_inflate(&st->z, Z_FINISH); |
| 322 | |
| 323 | total_read = st->z.next_out - (unsigned char *)buf; |
| 324 | |
| 325 | if (status == Z_STREAM_END) { |
| 326 | git_inflate_end(&st->z); |
| 327 | st->z_state = ODB_LOOSE_READ_STREAM_DONE; |
| 328 | break; |
| 329 | } |
| 330 | if (status != Z_OK && (status != Z_BUF_ERROR || total_read < sz)) { |
| 331 | git_inflate_end(&st->z); |
| 332 | st->z_state = ODB_LOOSE_READ_STREAM_ERROR; |
| 333 | return -1; |
| 334 | } |
| 335 | } |
| 336 | return total_read; |
| 337 | } |
| 338 | |
| 339 | static int close_istream_loose(struct odb_read_stream *_st) |
| 340 | { |
| 341 | struct odb_loose_read_stream *st = |
| 342 | container_of(_st, struct odb_loose_read_stream, base); |
| 343 | |
| 344 | if (st->z_state == ODB_LOOSE_READ_STREAM_INUSE) |
| 345 | git_inflate_end(&st->z); |
| 346 | munmap(st->mapped, st->mapsize); |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | static int odb_source_loose_read_object_stream(struct odb_read_stream **out, |
| 351 | struct odb_source *source, |
| 352 | const struct object_id *oid) |
| 353 | { |
| 354 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 355 | struct object_info oi = OBJECT_INFO_INIT; |
| 356 | struct odb_loose_read_stream *st; |
| 357 | unsigned long mapsize; |
| 358 | unsigned long size_ul; |
| 359 | void *mapped; |
| 360 | |
| 361 | mapped = odb_source_loose_map_object(loose, oid, &mapsize); |
| 362 | if (!mapped) |
| 363 | return -1; |
| 364 | |
| 365 | /* |
| 366 | * Note: we must allocate this structure early even though we may still |
| 367 | * fail. This is because we need to initialize the zlib stream, and it |
| 368 | * is not possible to copy the stream around after the fact because it |
| 369 | * has self-referencing pointers. |
| 370 | */ |
| 371 | CALLOC_ARRAY(st, 1); |
| 372 | |
| 373 | switch (unpack_loose_header(&st->z, mapped, mapsize, st->hdr, |
| 374 | sizeof(st->hdr))) { |
| 375 | case ULHR_OK: |
| 376 | break; |
| 377 | case ULHR_BAD: |
| 378 | case ULHR_TOO_LONG: |
| 379 | goto error; |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * object_info.sizep is unsigned long* (32-bit on Windows), but |
| 384 | * st->base.size is size_t (64-bit). Use temporary variable. |
| 385 | * Note: loose objects >4GB would still truncate here, but such |
| 386 | * large loose objects are uncommon (they'd normally be packed). |
| 387 | */ |
| 388 | oi.sizep = &size_ul; |
| 389 | oi.typep = &st->base.type; |
| 390 | |
| 391 | if (parse_loose_header(st->hdr, &oi) < 0 || st->base.type < 0) |
| 392 | goto error; |
| 393 | st->base.size = size_ul; |
| 394 | |
| 395 | st->mapped = mapped; |
| 396 | st->mapsize = mapsize; |
| 397 | st->hdr_used = strlen(st->hdr) + 1; |
| 398 | st->hdr_avail = st->z.total_out; |
| 399 | st->z_state = ODB_LOOSE_READ_STREAM_INUSE; |
| 400 | st->base.close = close_istream_loose; |
| 401 | st->base.read = read_istream_loose; |
| 402 | |
| 403 | *out = &st->base; |
| 404 | |
| 405 | return 0; |
| 406 | error: |
| 407 | git_inflate_end(&st->z); |
| 408 | munmap(mapped, mapsize); |
| 409 | free(st); |
| 410 | return -1; |
| 411 | } |
| 412 | |
| 413 | struct for_each_object_wrapper_data { |
| 414 | struct odb_source_loose *loose; |
| 415 | const struct object_info *request; |
| 416 | odb_for_each_object_cb cb; |
| 417 | void *cb_data; |
| 418 | }; |
| 419 | |
| 420 | static int for_each_object_wrapper_cb(const struct object_id *oid, |
| 421 | const char *path, |
| 422 | void *cb_data) |
| 423 | { |
| 424 | struct for_each_object_wrapper_data *data = cb_data; |
| 425 | |
| 426 | if (data->request) { |
| 427 | struct object_info oi = *data->request; |
| 428 | |
| 429 | if (read_object_info_from_path(data->loose, path, oid, &oi, 0) < 0) |
| 430 | return -1; |
| 431 | |
| 432 | return data->cb(oid, &oi, data->cb_data); |
| 433 | } else { |
| 434 | return data->cb(oid, NULL, data->cb_data); |
| 435 | } |
| 436 | } |
| 437 | |
| 438 | static int for_each_prefixed_object_wrapper_cb(const struct object_id *oid, |
| 439 | void *node_data UNUSED, |
| 440 | void *cb_data) |
| 441 | { |
| 442 | struct for_each_object_wrapper_data *data = cb_data; |
| 443 | if (data->request) { |
| 444 | struct object_info oi = *data->request; |
| 445 | |
| 446 | if (odb_source_read_object_info(&data->loose->base, |
| 447 | oid, &oi, 0) < 0) |
| 448 | return -1; |
| 449 | |
| 450 | return data->cb(oid, &oi, data->cb_data); |
| 451 | } else { |
| 452 | return data->cb(oid, NULL, data->cb_data); |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | static int odb_source_loose_for_each_object(struct odb_source *source, |
| 457 | const struct object_info *request, |
| 458 | odb_for_each_object_cb cb, |
| 459 | void *cb_data, |
| 460 | const struct odb_for_each_object_options *opts) |
| 461 | { |
| 462 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 463 | struct for_each_object_wrapper_data data = { |
| 464 | .loose = loose, |
| 465 | .request = request, |
| 466 | .cb = cb, |
| 467 | .cb_data = cb_data, |
| 468 | }; |
| 469 | |
| 470 | /* There are no loose promisor objects, so we can return immediately. */ |
| 471 | if ((opts->flags & ODB_FOR_EACH_OBJECT_PROMISOR_ONLY)) |
| 472 | return 0; |
| 473 | if ((opts->flags & ODB_FOR_EACH_OBJECT_LOCAL_ONLY) && !source->local) |
| 474 | return 0; |
| 475 | |
| 476 | if (opts->prefix) |
| 477 | return oidtree_each(odb_source_loose_cache(loose, opts->prefix), |
| 478 | opts->prefix, opts->prefix_hex_len, |
| 479 | for_each_prefixed_object_wrapper_cb, &data); |
| 480 | |
| 481 | return for_each_loose_file_in_source(source, for_each_object_wrapper_cb, |
| 482 | NULL, NULL, &data); |
| 483 | } |
| 484 | |
| 485 | struct find_abbrev_len_data { |
| 486 | const struct object_id *oid; |
| 487 | unsigned len; |
| 488 | }; |
| 489 | |
| 490 | static int find_abbrev_len_cb(const struct object_id *oid, |
| 491 | struct object_info *oi UNUSED, |
| 492 | void *cb_data) |
| 493 | { |
| 494 | struct find_abbrev_len_data *data = cb_data; |
| 495 | unsigned len = oid_common_prefix_hexlen(oid, data->oid); |
| 496 | if (len != hash_algos[oid->algo].hexsz && len >= data->len) |
| 497 | data->len = len + 1; |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static int odb_source_loose_find_abbrev_len(struct odb_source *source, |
| 502 | const struct object_id *oid, |
| 503 | unsigned min_len, |
| 504 | unsigned *out) |
| 505 | { |
| 506 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 507 | struct odb_for_each_object_options opts = { |
| 508 | .prefix = oid, |
| 509 | .prefix_hex_len = min_len, |
| 510 | }; |
| 511 | struct find_abbrev_len_data data = { |
| 512 | .oid = oid, |
| 513 | .len = min_len, |
| 514 | }; |
| 515 | int ret; |
| 516 | |
| 517 | ret = odb_source_for_each_object(&loose->base, NULL, find_abbrev_len_cb, |
| 518 | &data, &opts); |
| 519 | *out = data.len; |
| 520 | |
| 521 | return ret; |
| 522 | } |
| 523 | |
| 524 | static int count_loose_object(const struct object_id *oid UNUSED, |
| 525 | struct object_info *oi UNUSED, |
| 526 | void *payload) |
| 527 | { |
| 528 | unsigned long *count = payload; |
| 529 | (*count)++; |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | static int odb_source_loose_count_objects(struct odb_source *source, |
| 534 | enum odb_count_objects_flags flags, |
| 535 | unsigned long *out) |
| 536 | { |
| 537 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 538 | const unsigned hexsz = source->odb->repo->hash_algo->hexsz - 2; |
| 539 | char *path = NULL; |
| 540 | DIR *dir = NULL; |
| 541 | int ret; |
| 542 | |
| 543 | if (flags & ODB_COUNT_OBJECTS_APPROXIMATE) { |
| 544 | unsigned long count = 0; |
| 545 | struct dirent *ent; |
| 546 | |
| 547 | path = xstrfmt("%s/17", source->path); |
| 548 | |
| 549 | dir = opendir(path); |
| 550 | if (!dir) { |
| 551 | if (errno == ENOENT) { |
| 552 | *out = 0; |
| 553 | ret = 0; |
| 554 | goto out; |
| 555 | } |
| 556 | |
| 557 | ret = error_errno("cannot open object shard '%s'", path); |
| 558 | goto out; |
| 559 | } |
| 560 | |
| 561 | while ((ent = readdir(dir)) != NULL) { |
| 562 | if (strspn(ent->d_name, "0123456789abcdef") != hexsz || |
| 563 | ent->d_name[hexsz] != '\0') |
| 564 | continue; |
| 565 | count++; |
| 566 | } |
| 567 | |
| 568 | *out = count * 256; |
| 569 | ret = 0; |
| 570 | } else { |
| 571 | struct odb_for_each_object_options opts = { 0 }; |
| 572 | *out = 0; |
| 573 | ret = odb_source_for_each_object(&loose->base, NULL, count_loose_object, |
| 574 | out, &opts); |
| 575 | } |
| 576 | |
| 577 | out: |
| 578 | if (dir) |
| 579 | closedir(dir); |
| 580 | free(path); |
| 581 | return ret; |
| 582 | } |
| 583 | |
| 584 | static int odb_source_loose_freshen_object(struct odb_source *source, |
| 585 | const struct object_id *oid) |
| 586 | { |
| 587 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 588 | static struct strbuf path = STRBUF_INIT; |
| 589 | odb_loose_path(loose, &path, oid); |
| 590 | return !!check_and_freshen_file(path.buf, 1); |
| 591 | } |
| 592 | |
| 593 | static int odb_source_loose_write_object(struct odb_source *source, |
| 594 | const void *buf, unsigned long len, |
| 595 | enum object_type type, struct object_id *oid, |
| 596 | struct object_id *compat_oid_in, |
| 597 | enum odb_write_object_flags flags) |
| 598 | { |
| 599 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 600 | const struct git_hash_algo *algo = source->odb->repo->hash_algo; |
| 601 | const struct git_hash_algo *compat = source->odb->repo->compat_hash_algo; |
| 602 | struct object_id compat_oid; |
| 603 | char hdr[MAX_HEADER_LEN]; |
| 604 | int hdrlen = sizeof(hdr); |
| 605 | |
| 606 | /* Generate compat_oid */ |
| 607 | if (compat) { |
| 608 | if (compat_oid_in) |
| 609 | oidcpy(&compat_oid, compat_oid_in); |
| 610 | else if (type == OBJ_BLOB) |
| 611 | hash_object_file(compat, buf, len, type, &compat_oid); |
| 612 | else { |
| 613 | struct strbuf converted = STRBUF_INIT; |
| 614 | convert_object_file(source->odb->repo, &converted, algo, compat, |
| 615 | buf, len, type, 0); |
| 616 | hash_object_file(compat, converted.buf, converted.len, |
| 617 | type, &compat_oid); |
| 618 | strbuf_release(&converted); |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | /* Normally if we have it in the pack then we do not bother writing |
| 623 | * it out into .git/objects/??/?{38} file. |
| 624 | */ |
| 625 | write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen); |
| 626 | if (odb_freshen_object(source->odb, oid)) |
| 627 | return 0; |
| 628 | if (write_loose_object(loose, oid, hdr, hdrlen, buf, len, 0, flags)) |
| 629 | return -1; |
| 630 | if (compat) |
| 631 | return repo_add_loose_object_map(loose, oid, &compat_oid); |
| 632 | return 0; |
| 633 | } |
| 634 | |
| 635 | static int odb_source_loose_write_object_stream(struct odb_source *source, |
| 636 | struct odb_write_stream *in_stream, |
| 637 | size_t len, |
| 638 | struct object_id *oid) |
| 639 | { |
| 640 | /* |
| 641 | * TODO: the implementation should be moved here, see the comment on |
| 642 | * the called function in "object-file.h". |
| 643 | */ |
| 644 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 645 | return odb_source_loose_write_stream(loose, in_stream, len, oid); |
| 646 | } |
| 647 | |
| 648 | static int odb_source_loose_begin_transaction(struct odb_source *source UNUSED, |
| 649 | struct odb_transaction **out UNUSED) |
| 650 | { |
| 651 | /* TODO: this is a known omission that we'll want to address eventually. */ |
| 652 | return error("loose source does not support transactions"); |
| 653 | } |
| 654 | |
| 655 | static int odb_source_loose_read_alternates(struct odb_source *source UNUSED, |
| 656 | struct strvec *out UNUSED) |
| 657 | { |
| 658 | return 0; |
| 659 | } |
| 660 | |
| 661 | static int odb_source_loose_write_alternate(struct odb_source *source UNUSED, |
| 662 | const char *alternate UNUSED) |
| 663 | { |
| 664 | return error("loose source does not support alternates"); |
| 665 | } |
| 666 | |
| 667 | static void odb_source_loose_clear_cache(struct odb_source_loose *loose) |
| 668 | { |
| 669 | oidtree_clear(loose->cache); |
| 670 | FREE_AND_NULL(loose->cache); |
| 671 | memset(&loose->subdir_seen, 0, |
| 672 | sizeof(loose->subdir_seen)); |
| 673 | } |
| 674 | |
| 675 | static void odb_source_loose_reprepare(struct odb_source *source) |
| 676 | { |
| 677 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 678 | odb_source_loose_clear_cache(loose); |
| 679 | } |
| 680 | |
| 681 | static void odb_source_loose_close(struct odb_source *source UNUSED) |
| 682 | { |
| 683 | /* Nothing to do. */ |
| 684 | } |
| 685 | |
| 686 | static void odb_source_loose_reparent(const char *name UNUSED, |
| 687 | const char *old_cwd, |
| 688 | const char *new_cwd, |
| 689 | void *cb_data) |
| 690 | { |
| 691 | struct odb_source_loose *loose = cb_data; |
| 692 | char *path = reparent_relative_path(old_cwd, new_cwd, |
| 693 | loose->base.path); |
| 694 | free(loose->base.path); |
| 695 | loose->base.path = path; |
| 696 | } |
| 697 | |
| 698 | static void odb_source_loose_free(struct odb_source *source) |
| 699 | { |
| 700 | struct odb_source_loose *loose = odb_source_loose_downcast(source); |
| 701 | odb_source_loose_clear_cache(loose); |
| 702 | loose_object_map_clear(&loose->map); |
| 703 | chdir_notify_unregister(NULL, odb_source_loose_reparent, loose); |
| 704 | odb_source_release(&loose->base); |
| 705 | free(loose); |
| 706 | } |
| 707 | |
| 708 | struct odb_source_loose *odb_source_loose_new(struct object_database *odb, |
| 709 | const char *path, |
| 710 | bool local) |
| 711 | { |
| 712 | struct odb_source_loose *loose; |
| 713 | |
| 714 | CALLOC_ARRAY(loose, 1); |
| 715 | odb_source_init(&loose->base, odb, ODB_SOURCE_LOOSE, path, local); |
| 716 | |
| 717 | loose->base.free = odb_source_loose_free; |
| 718 | loose->base.close = odb_source_loose_close; |
| 719 | loose->base.reprepare = odb_source_loose_reprepare; |
| 720 | loose->base.read_object_info = odb_source_loose_read_object_info; |
| 721 | loose->base.read_object_stream = odb_source_loose_read_object_stream; |
| 722 | loose->base.for_each_object = odb_source_loose_for_each_object; |
| 723 | loose->base.find_abbrev_len = odb_source_loose_find_abbrev_len; |
| 724 | loose->base.count_objects = odb_source_loose_count_objects; |
| 725 | loose->base.freshen_object = odb_source_loose_freshen_object; |
| 726 | loose->base.write_object = odb_source_loose_write_object; |
| 727 | loose->base.write_object_stream = odb_source_loose_write_object_stream; |
| 728 | loose->base.begin_transaction = odb_source_loose_begin_transaction; |
| 729 | loose->base.read_alternates = odb_source_loose_read_alternates; |
| 730 | loose->base.write_alternate = odb_source_loose_write_alternate; |
| 731 | |
| 732 | if (!is_absolute_path(loose->base.path)) |
| 733 | chdir_notify_register(NULL, odb_source_loose_reparent, loose); |
| 734 | |
| 735 | return loose; |
| 736 | } |