diff options
Diffstat (limited to 'third_party/git/midx.c')
| -rw-r--r-- | third_party/git/midx.c | 1487 |
1 files changed, 0 insertions, 1487 deletions
diff --git a/third_party/git/midx.c b/third_party/git/midx.c deleted file mode 100644 index 0de42ffdfb22..000000000000 --- a/third_party/git/midx.c +++ /dev/null @@ -1,1487 +0,0 @@ -#include "cache.h" -#include "config.h" -#include "csum-file.h" -#include "dir.h" -#include "lockfile.h" -#include "packfile.h" -#include "object-store.h" -#include "sha1-lookup.h" -#include "midx.h" -#include "progress.h" -#include "trace2.h" -#include "run-command.h" - -#define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */ -#define MIDX_VERSION 1 -#define MIDX_BYTE_FILE_VERSION 4 -#define MIDX_BYTE_HASH_VERSION 5 -#define MIDX_BYTE_NUM_CHUNKS 6 -#define MIDX_BYTE_NUM_PACKS 8 -#define MIDX_HEADER_SIZE 12 -#define MIDX_MIN_SIZE (MIDX_HEADER_SIZE + the_hash_algo->rawsz) - -#define MIDX_MAX_CHUNKS 5 -#define MIDX_CHUNK_ALIGNMENT 4 -#define MIDX_CHUNKID_PACKNAMES 0x504e414d /* "PNAM" */ -#define MIDX_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */ -#define MIDX_CHUNKID_OIDLOOKUP 0x4f49444c /* "OIDL" */ -#define MIDX_CHUNKID_OBJECTOFFSETS 0x4f4f4646 /* "OOFF" */ -#define MIDX_CHUNKID_LARGEOFFSETS 0x4c4f4646 /* "LOFF" */ -#define MIDX_CHUNKLOOKUP_WIDTH (sizeof(uint32_t) + sizeof(uint64_t)) -#define MIDX_CHUNK_FANOUT_SIZE (sizeof(uint32_t) * 256) -#define MIDX_CHUNK_OFFSET_WIDTH (2 * sizeof(uint32_t)) -#define MIDX_CHUNK_LARGE_OFFSET_WIDTH (sizeof(uint64_t)) -#define MIDX_LARGE_OFFSET_NEEDED 0x80000000 - -#define PACK_EXPIRED UINT_MAX - -static uint8_t oid_version(void) -{ - switch (hash_algo_by_ptr(the_hash_algo)) { - case GIT_HASH_SHA1: - return 1; - case GIT_HASH_SHA256: - return 2; - default: - die(_("invalid hash version")); - } -} - -static char *get_midx_filename(const char *object_dir) -{ - return xstrfmt("%s/pack/multi-pack-index", object_dir); -} - -struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local) -{ - struct multi_pack_index *m = NULL; - int fd; - struct stat st; - size_t midx_size; - void *midx_map = NULL; - uint32_t hash_version; - char *midx_name = get_midx_filename(object_dir); - uint32_t i; - const char *cur_pack_name; - - fd = git_open(midx_name); - - if (fd < 0) - goto cleanup_fail; - if (fstat(fd, &st)) { - error_errno(_("failed to read %s"), midx_name); - goto cleanup_fail; - } - - midx_size = xsize_t(st.st_size); - - if (midx_size < MIDX_MIN_SIZE) { - error(_("multi-pack-index file %s is too small"), midx_name); - goto cleanup_fail; - } - - FREE_AND_NULL(midx_name); - - midx_map = xmmap(NULL, midx_size, PROT_READ, MAP_PRIVATE, fd, 0); - close(fd); - - FLEX_ALLOC_STR(m, object_dir, object_dir); - m->data = midx_map; - m->data_len = midx_size; - m->local = local; - - m->signature = get_be32(m->data); - if (m->signature != MIDX_SIGNATURE) - die(_("multi-pack-index signature 0x%08x does not match signature 0x%08x"), - m->signature, MIDX_SIGNATURE); - - m->version = m->data[MIDX_BYTE_FILE_VERSION]; - if (m->version != MIDX_VERSION) - die(_("multi-pack-index version %d not recognized"), - m->version); - - hash_version = m->data[MIDX_BYTE_HASH_VERSION]; - if (hash_version != oid_version()) { - error(_("multi-pack-index hash version %u does not match version %u"), - hash_version, oid_version()); - goto cleanup_fail; - } - m->hash_len = the_hash_algo->rawsz; - - m->num_chunks = m->data[MIDX_BYTE_NUM_CHUNKS]; - - m->num_packs = get_be32(m->data + MIDX_BYTE_NUM_PACKS); - - for (i = 0; i < m->num_chunks; i++) { - uint32_t chunk_id = get_be32(m->data + MIDX_HEADER_SIZE + - MIDX_CHUNKLOOKUP_WIDTH * i); - uint64_t chunk_offset = get_be64(m->data + MIDX_HEADER_SIZE + 4 + - MIDX_CHUNKLOOKUP_WIDTH * i); - - if (chunk_offset >= m->data_len) - die(_("invalid chunk offset (too large)")); - - switch (chunk_id) { - case MIDX_CHUNKID_PACKNAMES: - m->chunk_pack_names = m->data + chunk_offset; - break; - - case MIDX_CHUNKID_OIDFANOUT: - m->chunk_oid_fanout = (uint32_t *)(m->data + chunk_offset); - break; - - case MIDX_CHUNKID_OIDLOOKUP: - m->chunk_oid_lookup = m->data + chunk_offset; - break; - - case MIDX_CHUNKID_OBJECTOFFSETS: - m->chunk_object_offsets = m->data + chunk_offset; - break; - - case MIDX_CHUNKID_LARGEOFFSETS: - m->chunk_large_offsets = m->data + chunk_offset; - break; - - case 0: - die(_("terminating multi-pack-index chunk id appears earlier than expected")); - break; - - default: - /* - * Do nothing on unrecognized chunks, allowing future - * extensions to add optional chunks. - */ - break; - } - } - - if (!m->chunk_pack_names) - die(_("multi-pack-index missing required pack-name chunk")); - if (!m->chunk_oid_fanout) - die(_("multi-pack-index missing required OID fanout chunk")); - if (!m->chunk_oid_lookup) - die(_("multi-pack-index missing required OID lookup chunk")); - if (!m->chunk_object_offsets) - die(_("multi-pack-index missing required object offsets chunk")); - - m->num_objects = ntohl(m->chunk_oid_fanout[255]); - - m->pack_names = xcalloc(m->num_packs, sizeof(*m->pack_names)); - m->packs = xcalloc(m->num_packs, sizeof(*m->packs)); - - cur_pack_name = (const char *)m->chunk_pack_names; - for (i = 0; i < m->num_packs; i++) { - m->pack_names[i] = cur_pack_name; - - cur_pack_name += strlen(cur_pack_name) + 1; - - if (i && strcmp(m->pack_names[i], m->pack_names[i - 1]) <= 0) - die(_("multi-pack-index pack names out of order: '%s' before '%s'"), - m->pack_names[i - 1], - m->pack_names[i]); - } - - trace2_data_intmax("midx", the_repository, "load/num_packs", m->num_packs); - trace2_data_intmax("midx", the_repository, "load/num_objects", m->num_objects); - - return m; - -cleanup_fail: - free(m); - free(midx_name); - if (midx_map) - munmap(midx_map, midx_size); - if (0 <= fd) - close(fd); - return NULL; -} - -void close_midx(struct multi_pack_index *m) -{ - uint32_t i; - - if (!m) - return; - - munmap((unsigned char *)m->data, m->data_len); - - for (i = 0; i < m->num_packs; i++) { - if (m->packs[i]) - m->packs[i]->multi_pack_index = 0; - } - FREE_AND_NULL(m->packs); - FREE_AND_NULL(m->pack_names); -} - -int prepare_midx_pack(struct repository *r, struct multi_pack_index *m, uint32_t pack_int_id) -{ - struct strbuf pack_name = STRBUF_INIT; - struct packed_git *p; - - if (pack_int_id >= m->num_packs) - die(_("bad pack-int-id: %u (%u total packs)"), - pack_int_id, m->num_packs); - - if (m->packs[pack_int_id]) - return 0; - - strbuf_addf(&pack_name, "%s/pack/%s", m->object_dir, - m->pack_names[pack_int_id]); - - p = add_packed_git(pack_name.buf, pack_name.len, m->local); - strbuf_release(&pack_name); - - if (!p) - return 1; - - p->multi_pack_index = 1; - m->packs[pack_int_id] = p; - install_packed_git(r, p); - list_add_tail(&p->mru, &r->objects->packed_git_mru); - - return 0; -} - -int bsearch_midx(const struct object_id *oid, struct multi_pack_index *m, uint32_t *result) -{ - return bsearch_hash(oid->hash, m->chunk_oid_fanout, m->chunk_oid_lookup, - the_hash_algo->rawsz, result); -} - -struct object_id *nth_midxed_object_oid(struct object_id *oid, - struct multi_pack_index *m, - uint32_t n) -{ - if (n >= m->num_objects) - return NULL; - - hashcpy(oid->hash, m->chunk_oid_lookup + m->hash_len * n); - return oid; -} - -static off_t nth_midxed_offset(struct multi_pack_index *m, uint32_t pos) -{ - const unsigned char *offset_data; - uint32_t offset32; - - offset_data = m->chunk_object_offsets + pos * MIDX_CHUNK_OFFSET_WIDTH; - offset32 = get_be32(offset_data + sizeof(uint32_t)); - - if (m->chunk_large_offsets && offset32 & MIDX_LARGE_OFFSET_NEEDED) { - if (sizeof(off_t) < sizeof(uint64_t)) - die(_("multi-pack-index stores a 64-bit offset, but off_t is too small")); - - offset32 ^= MIDX_LARGE_OFFSET_NEEDED; - return get_be64(m->chunk_large_offsets + sizeof(uint64_t) * offset32); - } - - return offset32; -} - -static uint32_t nth_midxed_pack_int_id(struct multi_pack_index *m, uint32_t pos) -{ - return get_be32(m->chunk_object_offsets + pos * MIDX_CHUNK_OFFSET_WIDTH); -} - -static int nth_midxed_pack_entry(struct repository *r, - struct multi_pack_index *m, - struct pack_entry *e, - uint32_t pos) -{ - uint32_t pack_int_id; - struct packed_git *p; - - if (pos >= m->num_objects) - return 0; - - pack_int_id = nth_midxed_pack_int_id(m, pos); - - if (prepare_midx_pack(r, m, pack_int_id)) - die(_("error preparing packfile from multi-pack-index")); - p = m->packs[pack_int_id]; - - /* - * We are about to tell the caller where they can locate the - * requested object. We better make sure the packfile is - * still here and can be accessed before supplying that - * answer, as it may have been deleted since the MIDX was - * loaded! - */ - if (!is_pack_valid(p)) - return 0; - - if (p->num_bad_objects) { - uint32_t i; - struct object_id oid; - nth_midxed_object_oid(&oid, m, pos); - for (i = 0; i < p->num_bad_objects; i++) - if (hasheq(oid.hash, - p->bad_object_sha1 + the_hash_algo->rawsz * i)) - return 0; - } - - e->offset = nth_midxed_offset(m, pos); - e->p = p; - - return 1; -} - -int fill_midx_entry(struct repository * r, - const struct object_id *oid, - struct pack_entry *e, - struct multi_pack_index *m) -{ - uint32_t pos; - - if (!bsearch_midx(oid, m, &pos)) - return 0; - - return nth_midxed_pack_entry(r, m, e, pos); -} - -/* Match "foo.idx" against either "foo.pack" _or_ "foo.idx". */ -static int cmp_idx_or_pack_name(const char *idx_or_pack_name, - const char *idx_name) -{ - /* Skip past any initial matching prefix. */ - while (*idx_name && *idx_name == *idx_or_pack_name) { - idx_name++; - idx_or_pack_name++; - } - - /* - * If we didn't match completely, we may have matched "pack-1234." and - * be left with "idx" and "pack" respectively, which is also OK. We do - * not have to check for "idx" and "idx", because that would have been - * a complete match (and in that case these strcmps will be false, but - * we'll correctly return 0 from the final strcmp() below. - * - * Technically this matches "fooidx" and "foopack", but we'd never have - * such names in the first place. - */ - if (!strcmp(idx_name, "idx") && !strcmp(idx_or_pack_name, "pack")) - return 0; - - /* - * This not only checks for a complete match, but also orders based on - * the first non-identical character, which means our ordering will - * match a raw strcmp(). That makes it OK to use this to binary search - * a naively-sorted list. - */ - return strcmp(idx_or_pack_name, idx_name); -} - -int midx_contains_pack(struct multi_pack_index *m, const char *idx_or_pack_name) -{ - uint32_t first = 0, last = m->num_packs; - - while (first < last) { - uint32_t mid = first + (last - first) / 2; - const char *current; - int cmp; - - current = m->pack_names[mid]; - cmp = cmp_idx_or_pack_name(idx_or_pack_name, current); - if (!cmp) - return 1; - if (cmp > 0) { - first = mid + 1; - continue; - } - last = mid; - } - - return 0; -} - -int prepare_multi_pack_index_one(struct repository *r, const char *object_dir, int local) -{ - struct multi_pack_index *m; - struct multi_pack_index *m_search; - int config_value; - static int env_value = -1; - - if (env_value < 0) - env_value = git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0); - - if (!env_value && - (repo_config_get_bool(r, "core.multipackindex", &config_value) || - !config_value)) - return 0; - - for (m_search = r->objects->multi_pack_index; m_search; m_search = m_search->next) - if (!strcmp(object_dir, m_search->object_dir)) - return 1; - - m = load_multi_pack_index(object_dir, local); - - if (m) { - struct multi_pack_index *mp = r->objects->multi_pack_index; - if (mp) { - m->next = mp->next; - mp->next = m; - } else - r->objects->multi_pack_index = m; - return 1; - } - - return 0; -} - -static size_t write_midx_header(struct hashfile *f, - unsigned char num_chunks, - uint32_t num_packs) -{ - hashwrite_be32(f, MIDX_SIGNATURE); - hashwrite_u8(f, MIDX_VERSION); - hashwrite_u8(f, oid_version()); - hashwrite_u8(f, num_chunks); - hashwrite_u8(f, 0); /* unused */ - hashwrite_be32(f, num_packs); - - return MIDX_HEADER_SIZE; -} - -struct pack_info { - uint32_t orig_pack_int_id; - char *pack_name; - struct packed_git *p; - unsigned expired : 1; -}; - -static int pack_info_compare(const void *_a, const void *_b) -{ - struct pack_info *a = (struct pack_info *)_a; - struct pack_info *b = (struct pack_info *)_b; - return strcmp(a->pack_name, b->pack_name); -} - -struct pack_list { - struct pack_info *info; - uint32_t nr; - uint32_t alloc; - struct multi_pack_index *m; - struct progress *progress; - unsigned pack_paths_checked; -}; - -static void add_pack_to_midx(const char *full_path, size_t full_path_len, - const char *file_name, void *data) -{ - struct pack_list *packs = (struct pack_list *)data; - - if (ends_with(file_name, ".idx")) { - display_progress(packs->progress, ++packs->pack_paths_checked); - if (packs->m && midx_contains_pack(packs->m, file_name)) - return; - - ALLOC_GROW(packs->info, packs->nr + 1, packs->alloc); - - packs->info[packs->nr].p = add_packed_git(full_path, - full_path_len, - 0); - - if (!packs->info[packs->nr].p) { - warning(_("failed to add packfile '%s'"), - full_path); - return; - } - - if (open_pack_index(packs->info[packs->nr].p)) { - warning(_("failed to open pack-index '%s'"), - full_path); - close_pack(packs->info[packs->nr].p); - FREE_AND_NULL(packs->info[packs->nr].p); - return; - } - - packs->info[packs->nr].pack_name = xstrdup(file_name); - packs->info[packs->nr].orig_pack_int_id = packs->nr; - packs->info[packs->nr].expired = 0; - packs->nr++; - } -} - -struct pack_midx_entry { - struct object_id oid; - uint32_t pack_int_id; - time_t pack_mtime; - uint64_t offset; -}; - -static int midx_oid_compare(const void *_a, const void *_b) -{ - const struct pack_midx_entry *a = (const struct pack_midx_entry *)_a; - const struct pack_midx_entry *b = (const struct pack_midx_entry *)_b; - int cmp = oidcmp(&a->oid, &b->oid); - - if (cmp) - return cmp; - - if (a->pack_mtime > b->pack_mtime) - return -1; - else if (a->pack_mtime < b->pack_mtime) - return 1; - - return a->pack_int_id - b->pack_int_id; -} - -static int nth_midxed_pack_midx_entry(struct multi_pack_index *m, - struct pack_midx_entry *e, - uint32_t pos) -{ - if (pos >= m->num_objects) - return 1; - - nth_midxed_object_oid(&e->oid, m, pos); - e->pack_int_id = nth_midxed_pack_int_id(m, pos); - e->offset = nth_midxed_offset(m, pos); - - /* consider objects in midx to be from "old" packs */ - e->pack_mtime = 0; - return 0; -} - -static void fill_pack_entry(uint32_t pack_int_id, - struct packed_git *p, - uint32_t cur_object, - struct pack_midx_entry *entry) -{ - if (nth_packed_object_id(&entry->oid, p, cur_object) < 0) - die(_("failed to locate object %d in packfile"), cur_object); - - entry->pack_int_id = pack_int_id; - entry->pack_mtime = p->mtime; - - entry->offset = nth_packed_object_offset(p, cur_object); -} - -/* - * It is possible to artificially get into a state where there are many - * duplicate copies of objects. That can create high memory pressure if - * we are to create a list of all objects before de-duplication. To reduce - * this memory pressure without a significant performance drop, automatically - * group objects by the first byte of their object id. Use the IDX fanout - * tables to group the data, copy to a local array, then sort. - * - * Copy only the de-duplicated entries (selected by most-recent modified time - * of a packfile containing the object). - */ -static struct pack_midx_entry *get_sorted_entries(struct multi_pack_index *m, - struct pack_info *info, - uint32_t nr_packs, - uint32_t *nr_objects) -{ - uint32_t cur_fanout, cur_pack, cur_object; - uint32_t alloc_fanout, alloc_objects, total_objects = 0; - struct pack_midx_entry *entries_by_fanout = NULL; - struct pack_midx_entry *deduplicated_entries = NULL; - uint32_t start_pack = m ? m->num_packs : 0; - - for (cur_pack = start_pack; cur_pack < nr_packs; cur_pack++) - total_objects += info[cur_pack].p->num_objects; - - /* - * As we de-duplicate by fanout value, we expect the fanout - * slices to be evenly distributed, with some noise. Hence, - * allocate slightly more than one 256th. - */ - alloc_objects = alloc_fanout = total_objects > 3200 ? total_objects / 200 : 16; - - ALLOC_ARRAY(entries_by_fanout, alloc_fanout); - ALLOC_ARRAY(deduplicated_entries, alloc_objects); - *nr_objects = 0; - - for (cur_fanout = 0; cur_fanout < 256; cur_fanout++) { - uint32_t nr_fanout = 0; - - if (m) { - uint32_t start = 0, end; - - if (cur_fanout) - start = ntohl(m->chunk_oid_fanout[cur_fanout - 1]); - end = ntohl(m->chunk_oid_fanout[cur_fanout]); - - for (cur_object = start; cur_object < end; cur_object++) { - ALLOC_GROW(entries_by_fanout, nr_fanout + 1, alloc_fanout); - nth_midxed_pack_midx_entry(m, - &entries_by_fanout[nr_fanout], - cur_object); - nr_fanout++; - } - } - - for (cur_pack = start_pack; cur_pack < nr_packs; cur_pack++) { - uint32_t start = 0, end; - - if (cur_fanout) - start = get_pack_fanout(info[cur_pack].p, cur_fanout - 1); - end = get_pack_fanout(info[cur_pack].p, cur_fanout); - - for (cur_object = start; cur_object < end; cur_object++) { - ALLOC_GROW(entries_by_fanout, nr_fanout + 1, alloc_fanout); - fill_pack_entry(cur_pack, info[cur_pack].p, cur_object, &entries_by_fanout[nr_fanout]); - nr_fanout++; - } - } - - QSORT(entries_by_fanout, nr_fanout, midx_oid_compare); - - /* - * The batch is now sorted by OID and then mtime (descending). - * Take only the first duplicate. - */ - for (cur_object = 0; cur_object < nr_fanout; cur_object++) { - if (cur_object && oideq(&entries_by_fanout[cur_object - 1].oid, - &entries_by_fanout[cur_object].oid)) - continue; - - ALLOC_GROW(deduplicated_entries, *nr_objects + 1, alloc_objects); - memcpy(&deduplicated_entries[*nr_objects], - &entries_by_fanout[cur_object], - sizeof(struct pack_midx_entry)); - (*nr_objects)++; - } - } - - free(entries_by_fanout); - return deduplicated_entries; -} - -static size_t write_midx_pack_names(struct hashfile *f, - struct pack_info *info, - uint32_t num_packs) -{ - uint32_t i; - unsigned char padding[MIDX_CHUNK_ALIGNMENT]; - size_t written = 0; - - for (i = 0; i < num_packs; i++) { - size_t writelen; - - if (info[i].expired) - continue; - - if (i && strcmp(info[i].pack_name, info[i - 1].pack_name) <= 0) - BUG("incorrect pack-file order: %s before %s", - info[i - 1].pack_name, - info[i].pack_name); - - writelen = strlen(info[i].pack_name) + 1; - hashwrite(f, info[i].pack_name, writelen); - written += writelen; - } - - /* add padding to be aligned */ - i = MIDX_CHUNK_ALIGNMENT - (written % MIDX_CHUNK_ALIGNMENT); - if (i < MIDX_CHUNK_ALIGNMENT) { - memset(padding, 0, sizeof(padding)); - hashwrite(f, padding, i); - written += i; - } - - return written; -} - -static size_t write_midx_oid_fanout(struct hashfile *f, - struct pack_midx_entry *objects, - uint32_t nr_objects) -{ - struct pack_midx_entry *list = objects; - struct pack_midx_entry *last = objects + nr_objects; - uint32_t count = 0; - uint32_t i; - - /* - * Write the first-level table (the list is sorted, - * but we use a 256-entry lookup to be able to avoid - * having to do eight extra binary search iterations). - */ - for (i = 0; i < 256; i++) { - struct pack_midx_entry *next = list; - - while (next < last && next->oid.hash[0] == i) { - count++; - next++; - } - - hashwrite_be32(f, count); - list = next; - } - - return MIDX_CHUNK_FANOUT_SIZE; -} - -static size_t write_midx_oid_lookup(struct hashfile *f, unsigned char hash_len, - struct pack_midx_entry *objects, - uint32_t nr_objects) -{ - struct pack_midx_entry *list = objects; - uint32_t i; - size_t written = 0; - - for (i = 0; i < nr_objects; i++) { - struct pack_midx_entry *obj = list++; - - if (i < nr_objects - 1) { - struct pack_midx_entry *next = list; - if (oidcmp(&obj->oid, &next->oid) >= 0) - BUG("OIDs not in order: %s >= %s", - oid_to_hex(&obj->oid), - oid_to_hex(&next->oid)); - } - - hashwrite(f, obj->oid.hash, (int)hash_len); - written += hash_len; - } - - return written; -} - -static size_t write_midx_object_offsets(struct hashfile *f, int large_offset_needed, - uint32_t *perm, - struct pack_midx_entry *objects, uint32_t nr_objects) -{ - struct pack_midx_entry *list = objects; - uint32_t i, nr_large_offset = 0; - size_t written = 0; - - for (i = 0; i < nr_objects; i++) { - struct pack_midx_entry *obj = list++; - - if (perm[obj->pack_int_id] == PACK_EXPIRED) - BUG("object %s is in an expired pack with int-id %d", - oid_to_hex(&obj->oid), - obj->pack_int_id); - - hashwrite_be32(f, perm[obj->pack_int_id]); - - if (large_offset_needed && obj->offset >> 31) - hashwrite_be32(f, MIDX_LARGE_OFFSET_NEEDED | nr_large_offset++); - else if (!large_offset_needed && obj->offset >> 32) - BUG("object %s requires a large offset (%"PRIx64") but the MIDX is not writing large offsets!", - oid_to_hex(&obj->oid), - obj->offset); - else - hashwrite_be32(f, (uint32_t)obj->offset); - - written += MIDX_CHUNK_OFFSET_WIDTH; - } - - return written; -} - -static size_t write_midx_large_offsets(struct hashfile *f, uint32_t nr_large_offset, - struct pack_midx_entry *objects, uint32_t nr_objects) -{ - struct pack_midx_entry *list = objects, *end = objects + nr_objects; - size_t written = 0; - - while (nr_large_offset) { - struct pack_midx_entry *obj; - uint64_t offset; - - if (list >= end) - BUG("too many large-offset objects"); - - obj = list++; - offset = obj->offset; - - if (!(offset >> 31)) - continue; - - hashwrite_be32(f, offset >> 32); - hashwrite_be32(f, offset & 0xffffffffUL); - written += 2 * sizeof(uint32_t); - - nr_large_offset--; - } - - return written; -} - -static int write_midx_internal(const char *object_dir, struct multi_pack_index *m, - struct string_list *packs_to_drop, unsigned flags) -{ - unsigned char cur_chunk, num_chunks = 0; - char *midx_name; - uint32_t i; - struct hashfile *f = NULL; - struct lock_file lk; - struct pack_list packs; - uint32_t *pack_perm = NULL; - uint64_t written = 0; - uint32_t chunk_ids[MIDX_MAX_CHUNKS + 1]; - uint64_t chunk_offsets[MIDX_MAX_CHUNKS + 1]; - uint32_t nr_entries, num_large_offsets = 0; - struct pack_midx_entry *entries = NULL; - struct progress *progress = NULL; - int large_offsets_needed = 0; - int pack_name_concat_len = 0; - int dropped_packs = 0; - int result = 0; - - midx_name = get_midx_filename(object_dir); - if (safe_create_leading_directories(midx_name)) - die_errno(_("unable to create leading directories of %s"), - midx_name); - - if (m) - packs.m = m; - else - packs.m = load_multi_pack_index(object_dir, 1); - - packs.nr = 0; - packs.alloc = packs.m ? packs.m->num_packs : 16; - packs.info = NULL; - ALLOC_ARRAY(packs.info, packs.alloc); - - if (packs.m) { - for (i = 0; i < packs.m->num_packs; i++) { - ALLOC_GROW(packs.info, packs.nr + 1, packs.alloc); - - packs.info[packs.nr].orig_pack_int_id = i; - packs.info[packs.nr].pack_name = xstrdup(packs.m->pack_names[i]); - packs.info[packs.nr].p = NULL; - packs.info[packs.nr].expired = 0; - packs.nr++; - } - } - - packs.pack_paths_checked = 0; - if (flags & MIDX_PROGRESS) - packs.progress = start_progress(_("Adding packfiles to multi-pack-index"), 0); - else - packs.progress = NULL; - - for_each_file_in_pack_dir(object_dir, add_pack_to_midx, &packs); - stop_progress(&packs.progress); - - if (packs.m && packs.nr == packs.m->num_packs && !packs_to_drop) - goto cleanup; - - entries = get_sorted_entries(packs.m, packs.info, packs.nr, &nr_entries); - - for (i = 0; i < nr_entries; i++) { - if (entries[i].offset > 0x7fffffff) - num_large_offsets++; - if (entries[i].offset > 0xffffffff) - large_offsets_needed = 1; - } - - QSORT(packs.info, packs.nr, pack_info_compare); - - if (packs_to_drop && packs_to_drop->nr) { - int drop_index = 0; - int missing_drops = 0; - - for (i = 0; i < packs.nr && drop_index < packs_to_drop->nr; i++) { - int cmp = strcmp(packs.info[i].pack_name, - packs_to_drop->items[drop_index].string); - - if (!cmp) { - drop_index++; - packs.info[i].expired = 1; - } else if (cmp > 0) { - error(_("did not see pack-file %s to drop"), - packs_to_drop->items[drop_index].string); - drop_index++; - missing_drops++; - i--; - } else { - packs.info[i].expired = 0; - } - } - - if (missing_drops) { - result = 1; - goto cleanup; - } - } - - /* - * pack_perm stores a permutation between pack-int-ids from the - * previous multi-pack-index to the new one we are writing: - * - * pack_perm[old_id] = new_id - */ - ALLOC_ARRAY(pack_perm, packs.nr); - for (i = 0; i < packs.nr; i++) { - if (packs.info[i].expired) { - dropped_packs++; - pack_perm[packs.info[i].orig_pack_int_id] = PACK_EXPIRED; - } else { - pack_perm[packs.info[i].orig_pack_int_id] = i - dropped_packs; - } - } - - for (i = 0; i < packs.nr; i++) { - if (!packs.info[i].expired) - pack_name_concat_len += strlen(packs.info[i].pack_name) + 1; - } - - if (pack_name_concat_len % MIDX_CHUNK_ALIGNMENT) - pack_name_concat_len += MIDX_CHUNK_ALIGNMENT - - (pack_name_concat_len % MIDX_CHUNK_ALIGNMENT); - - hold_lock_file_for_update(&lk, midx_name, LOCK_DIE_ON_ERROR); - f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf); - FREE_AND_NULL(midx_name); - - if (packs.m) - close_midx(packs.m); - - cur_chunk = 0; - num_chunks = large_offsets_needed ? 5 : 4; - - if (packs.nr - dropped_packs == 0) { - error(_("no pack files to index.")); - result = 1; - goto cleanup; - } - - written = write_midx_header(f, num_chunks, packs.nr - dropped_packs); - - chunk_ids[cur_chunk] = MIDX_CHUNKID_PACKNAMES; - chunk_offsets[cur_chunk] = written + (num_chunks + 1) * MIDX_CHUNKLOOKUP_WIDTH; - - cur_chunk++; - chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDFANOUT; - chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + pack_name_concat_len; - - cur_chunk++; - chunk_ids[cur_chunk] = MIDX_CHUNKID_OIDLOOKUP; - chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + MIDX_CHUNK_FANOUT_SIZE; - - cur_chunk++; - chunk_ids[cur_chunk] = MIDX_CHUNKID_OBJECTOFFSETS; - chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_entries * the_hash_algo->rawsz; - - cur_chunk++; - chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + nr_entries * MIDX_CHUNK_OFFSET_WIDTH; - if (large_offsets_needed) { - chunk_ids[cur_chunk] = MIDX_CHUNKID_LARGEOFFSETS; - - cur_chunk++; - chunk_offsets[cur_chunk] = chunk_offsets[cur_chunk - 1] + - num_large_offsets * MIDX_CHUNK_LARGE_OFFSET_WIDTH; - } - - chunk_ids[cur_chunk] = 0; - - for (i = 0; i <= num_chunks; i++) { - if (i && chunk_offsets[i] < chunk_offsets[i - 1]) - BUG("incorrect chunk offsets: %"PRIu64" before %"PRIu64, - chunk_offsets[i - 1], - chunk_offsets[i]); - - if (chunk_offsets[i] % MIDX_CHUNK_ALIGNMENT) - BUG("chunk offset %"PRIu64" is not properly aligned", - chunk_offsets[i]); - - hashwrite_be32(f, chunk_ids[i]); - hashwrite_be32(f, chunk_offsets[i] >> 32); - hashwrite_be32(f, chunk_offsets[i]); - - written += MIDX_CHUNKLOOKUP_WIDTH; - } - - if (flags & MIDX_PROGRESS) - progress = start_progress(_("Writing chunks to multi-pack-index"), - num_chunks); - for (i = 0; i < num_chunks; i++) { - if (written != chunk_offsets[i]) - BUG("incorrect chunk offset (%"PRIu64" != %"PRIu64") for chunk id %"PRIx32, - chunk_offsets[i], - written, - chunk_ids[i]); - - switch (chunk_ids[i]) { - case MIDX_CHUNKID_PACKNAMES: - written += write_midx_pack_names(f, packs.info, packs.nr); - break; - - case MIDX_CHUNKID_OIDFANOUT: - written += write_midx_oid_fanout(f, entries, nr_entries); - break; - - case MIDX_CHUNKID_OIDLOOKUP: - written += write_midx_oid_lookup(f, the_hash_algo->rawsz, entries, nr_entries); - break; - - case MIDX_CHUNKID_OBJECTOFFSETS: - written += write_midx_object_offsets(f, large_offsets_needed, pack_perm, entries, nr_entries); - break; - - case MIDX_CHUNKID_LARGEOFFSETS: - written += write_midx_large_offsets(f, num_large_offsets, entries, nr_entries); - break; - - default: - BUG("trying to write unknown chunk id %"PRIx32, - chunk_ids[i]); - } - - display_progress(progress, i + 1); - } - stop_progress(&progress); - - if (written != chunk_offsets[num_chunks]) - BUG("incorrect final offset %"PRIu64" != %"PRIu64, - written, - chunk_offsets[num_chunks]); - - finalize_hashfile(f, NULL, CSUM_FSYNC | CSUM_HASH_IN_STREAM); - commit_lock_file(&lk); - -cleanup: - for (i = 0; i < packs.nr; i++) { - if (packs.info[i].p) { - close_pack(packs.info[i].p); - free(packs.info[i].p); - } - free(packs.info[i].pack_name); - } - - free(packs.info); - free(entries); - free(pack_perm); - free(midx_name); - return result; -} - -int write_midx_file(const char *object_dir, unsigned flags) -{ - return write_midx_internal(object_dir, NULL, NULL, flags); -} - -void clear_midx_file(struct repository *r) -{ - char *midx = get_midx_filename(r->objects->odb->path); - - if (r->objects && r->objects->multi_pack_index) { - close_midx(r->objects->multi_pack_index); - r->objects->multi_pack_index = NULL; - } - - if (remove_path(midx)) - die(_("failed to clear multi-pack-index at %s"), midx); - - free(midx); -} - -static int verify_midx_error; - -static void midx_report(const char *fmt, ...) -{ - va_list ap; - verify_midx_error = 1; - va_start(ap, fmt); - vfprintf(stderr, fmt, ap); - fprintf(stderr, "\n"); - va_end(ap); -} - -struct pair_pos_vs_id -{ - uint32_t pos; - uint32_t pack_int_id; -}; - -static int compare_pair_pos_vs_id(const void *_a, const void *_b) -{ - struct pair_pos_vs_id *a = (struct pair_pos_vs_id *)_a; - struct pair_pos_vs_id *b = (struct pair_pos_vs_id *)_b; - - return b->pack_int_id - a->pack_int_id; -} - -/* - * Limit calls to display_progress() for performance reasons. - * The interval here was arbitrarily chosen. - */ -#define SPARSE_PROGRESS_INTERVAL (1 << 12) -#define midx_display_sparse_progress(progress, n) \ - do { \ - uint64_t _n = (n); \ - if ((_n & (SPARSE_PROGRESS_INTERVAL - 1)) == 0) \ - display_progress(progress, _n); \ - } while (0) - -int verify_midx_file(struct repository *r, const char *object_dir, unsigned flags) -{ - struct pair_pos_vs_id *pairs = NULL; - uint32_t i; - struct progress *progress = NULL; - struct multi_pack_index *m = load_multi_pack_index(object_dir, 1); - verify_midx_error = 0; - - if (!m) { - int result = 0; - struct stat sb; - char *filename = get_midx_filename(object_dir); - if (!stat(filename, &sb)) { - error(_("multi-pack-index file exists, but failed to parse")); - result = 1; - } - free(filename); - return result; - } - - if (flags & MIDX_PROGRESS) - progress = start_progress(_("Looking for referenced packfiles"), - m->num_packs); - for (i = 0; i < m->num_packs; i++) { - if (prepare_midx_pack(r, m, i)) - midx_report("failed to load pack in position %d", i); - - display_progress(progress, i + 1); - } - stop_progress(&progress); - - for (i = 0; i < 255; i++) { - uint32_t oid_fanout1 = ntohl(m->chunk_oid_fanout[i]); - uint32_t oid_fanout2 = ntohl(m->chunk_oid_fanout[i + 1]); - - if (oid_fanout1 > oid_fanout2) - midx_report(_("oid fanout out of order: fanout[%d] = %"PRIx32" > %"PRIx32" = fanout[%d]"), - i, oid_fanout1, oid_fanout2, i + 1); - } - - if (m->num_objects == 0) { - midx_report(_("the midx contains no oid")); - /* - * Remaining tests assume that we have objects, so we can - * return here. - */ - return verify_midx_error; - } - - if (flags & MIDX_PROGRESS) - progress = start_sparse_progress(_("Verifying OID order in multi-pack-index"), - m->num_objects - 1); - for (i = 0; i < m->num_objects - 1; i++) { - struct object_id oid1, oid2; - - nth_midxed_object_oid(&oid1, m, i); - nth_midxed_object_oid(&oid2, m, i + 1); - - if (oidcmp(&oid1, &oid2) >= 0) - midx_report(_("oid lookup out of order: oid[%d] = %s >= %s = oid[%d]"), - i, oid_to_hex(&oid1), oid_to_hex(&oid2), i + 1); - - midx_display_sparse_progress(progress, i + 1); - } - stop_progress(&progress); - - /* - * Create an array mapping each object to its packfile id. Sort it - * to group the objects by packfile. Use this permutation to visit - * each of the objects and only require 1 packfile to be open at a - * time. - */ - ALLOC_ARRAY(pairs, m->num_objects); - for (i = 0; i < m->num_objects; i++) { - pairs[i].pos = i; - pairs[i].pack_int_id = nth_midxed_pack_int_id(m, i); - } - - if (flags & MIDX_PROGRESS) - progress = start_sparse_progress(_("Sorting objects by packfile"), - m->num_objects); - display_progress(progress, 0); /* TODO: Measure QSORT() progress */ - QSORT(pairs, m->num_objects, compare_pair_pos_vs_id); - stop_progress(&progress); - - if (flags & MIDX_PROGRESS) - progress = start_sparse_progress(_("Verifying object offsets"), m->num_objects); - for (i = 0; i < m->num_objects; i++) { - struct object_id oid; - struct pack_entry e; - off_t m_offset, p_offset; - - if (i > 0 && pairs[i-1].pack_int_id != pairs[i].pack_int_id && - m->packs[pairs[i-1].pack_int_id]) - { - close_pack_fd(m->packs[pairs[i-1].pack_int_id]); - close_pack_index(m->packs[pairs[i-1].pack_int_id]); - } - - nth_midxed_object_oid(&oid, m, pairs[i].pos); - - if (!fill_midx_entry(r, &oid, &e, m)) { - midx_report(_("failed to load pack entry for oid[%d] = %s"), - pairs[i].pos, oid_to_hex(&oid)); - continue; - } - - if (open_pack_index(e.p)) { - midx_report(_("failed to load pack-index for packfile %s"), - e.p->pack_name); - break; - } - - m_offset = e.offset; - p_offset = find_pack_entry_one(oid.hash, e.p); - - if (m_offset != p_offset) - midx_report(_("incorrect object offset for oid[%d] = %s: %"PRIx64" != %"PRIx64), - pairs[i].pos, oid_to_hex(&oid), m_offset, p_offset); - - midx_display_sparse_progress(progress, i + 1); - } - stop_progress(&progress); - - free(pairs); - - return verify_midx_error; -} - -int expire_midx_packs(struct repository *r, const char *object_dir, unsigned flags) -{ - uint32_t i, *count, result = 0; - struct string_list packs_to_drop = STRING_LIST_INIT_DUP; - struct multi_pack_index *m = load_multi_pack_index(object_dir, 1); - struct progress *progress = NULL; - - if (!m) - return 0; - - count = xcalloc(m->num_packs, sizeof(uint32_t)); - - if (flags & MIDX_PROGRESS) - progress = start_progress(_("Counting referenced objects"), - m->num_objects); - for (i = 0; i < m->num_objects; i++) { - int pack_int_id = nth_midxed_pack_int_id(m, i); - count[pack_int_id]++; - display_progress(progress, i + 1); - } - stop_progress(&progress); - - if (flags & MIDX_PROGRESS) - progress = start_progress(_("Finding and deleting unreferenced packfiles"), - m->num_packs); - for (i = 0; i < m->num_packs; i++) { - char *pack_name; - display_progress(progress, i + 1); - - if (count[i]) - continue; - - if (prepare_midx_pack(r, m, i)) - continue; - - if (m->packs[i]->pack_keep) - continue; - - pack_name = xstrdup(m->packs[i]->pack_name); - close_pack(m->packs[i]); - - string_list_insert(&packs_to_drop, m->pack_names[i]); - unlink_pack_path(pack_name, 0); - free(pack_name); - } - stop_progress(&progress); - - free(count); - - if (packs_to_drop.nr) - result = write_midx_internal(object_dir, m, &packs_to_drop, flags); - - string_list_clear(&packs_to_drop, 0); - return result; -} - -struct repack_info { - timestamp_t mtime; - uint32_t referenced_objects; - uint32_t pack_int_id; -}; - -static int compare_by_mtime(const void *a_, const void *b_) -{ - const struct repack_info *a, *b; - - a = (const struct repack_info *)a_; - b = (const struct repack_info *)b_; - - if (a->mtime < b->mtime) - return -1; - if (a->mtime > b->mtime) - return 1; - return 0; -} - -static int fill_included_packs_all(struct repository *r, - struct multi_pack_index *m, - unsigned char *include_pack) -{ - uint32_t i, count = 0; - int pack_kept_objects = 0; - - repo_config_get_bool(r, "repack.packkeptobjects", &pack_kept_objects); - - for (i = 0; i < m->num_packs; i++) { - if (prepare_midx_pack(r, m, i)) - continue; - if (!pack_kept_objects && m->packs[i]->pack_keep) - continue; - - include_pack[i] = 1; - count++; - } - - return count < 2; -} - -static int fill_included_packs_batch(struct repository *r, - struct multi_pack_index *m, - unsigned char *include_pack, - size_t batch_size) -{ - uint32_t i, packs_to_repack; - size_t total_size; - struct repack_info *pack_info = xcalloc(m->num_packs, sizeof(struct repack_info)); - int pack_kept_objects = 0; - - repo_config_get_bool(r, "repack.packkeptobjects", &pack_kept_objects); - - for (i = 0; i < m->num_packs; i++) { - pack_info[i].pack_int_id = i; - - if (prepare_midx_pack(r, m, i)) - continue; - - pack_info[i].mtime = m->packs[i]->mtime; - } - - for (i = 0; batch_size && i < m->num_objects; i++) { - uint32_t pack_int_id = nth_midxed_pack_int_id(m, i); - pack_info[pack_int_id].referenced_objects++; - } - - QSORT(pack_info, m->num_packs, compare_by_mtime); - - total_size = 0; - packs_to_repack = 0; - for (i = 0; total_size < batch_size && i < m->num_packs; i++) { - int pack_int_id = pack_info[i].pack_int_id; - struct packed_git *p = m->packs[pack_int_id]; - size_t expected_size; - - if (!p) - continue; - if (!pack_kept_objects && p->pack_keep) - continue; - if (open_pack_index(p) || !p->num_objects) - continue; - - expected_size = (size_t)(p->pack_size - * pack_info[i].referenced_objects); - expected_size /= p->num_objects; - - if (expected_size >= batch_size) - continue; - - packs_to_repack++; - total_size += expected_size; - include_pack[pack_int_id] = 1; - } - - free(pack_info); - - if (packs_to_repack < 2) - return 1; - - return 0; -} - -int midx_repack(struct repository *r, const char *object_dir, size_t batch_size, unsigned flags) -{ - int result = 0; - uint32_t i; - unsigned char *include_pack; - struct child_process cmd = CHILD_PROCESS_INIT; - FILE *cmd_in; - struct strbuf base_name = STRBUF_INIT; - struct multi_pack_index *m = load_multi_pack_index(object_dir, 1); - - /* - * When updating the default for these configuration - * variables in builtin/repack.c, these must be adjusted - * to match. - */ - int delta_base_offset = 1; - int use_delta_islands = 0; - - if (!m) - return 0; - - include_pack = xcalloc(m->num_packs, sizeof(unsigned char)); - - if (batch_size) { - if (fill_included_packs_batch(r, m, include_pack, batch_size)) - goto cleanup; - } else if (fill_included_packs_all(r, m, include_pack)) - goto cleanup; - - repo_config_get_bool(r, "repack.usedeltabaseoffset", &delta_base_offset); - repo_config_get_bool(r, "repack.usedeltaislands", &use_delta_islands); - - strvec_push(&cmd.args, "pack-objects"); - - strbuf_addstr(&base_name, object_dir); - strbuf_addstr(&base_name, "/pack/pack"); - strvec_push(&cmd.args, base_name.buf); - - if (delta_base_offset) - strvec_push(&cmd.args, "--delta-base-offset"); - if (use_delta_islands) - strvec_push(&cmd.args, "--delta-islands"); - - if (flags & MIDX_PROGRESS) - strvec_push(&cmd.args, "--progress"); - else - strvec_push(&cmd.args, "-q"); - - strbuf_release(&base_name); - - cmd.git_cmd = 1; - cmd.in = cmd.out = -1; - - if (start_command(&cmd)) { - error(_("could not start pack-objects")); - result = 1; - goto cleanup; - } - - cmd_in = xfdopen(cmd.in, "w"); - - for (i = 0; i < m->num_objects; i++) { - struct object_id oid; - uint32_t pack_int_id = nth_midxed_pack_int_id(m, i); - - if (!include_pack[pack_int_id]) - continue; - - nth_midxed_object_oid(&oid, m, i); - fprintf(cmd_in, "%s\n", oid_to_hex(&oid)); - } - fclose(cmd_in); - - if (finish_command(&cmd)) { - error(_("could not finish pack-objects")); - result = 1; - goto cleanup; - } - - result = write_midx_internal(object_dir, m, NULL, flags); - m = NULL; - -cleanup: - if (m) - close_midx(m); - free(include_pack); - return result; -} |