#include "git-compat-util.h" #include "abspath.h" #include "config.h" #include "csum-file.h" #include "dir.h" #include "gettext.h" #include "hex.h" #include "lockfile.h" #include "packfile.h" #include "object-file.h" #include "object-store-ll.h" #include "hash-lookup.h" #include "midx.h" #include "progress.h" #include "trace2.h" #include "run-command.h" #include "repository.h" #include "chunk-format.h" #include "pack.h" #include "pack-bitmap.h" #include "refs.h" #include "revision.h" #include "list-objects.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_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_CHUNKID_REVINDEX 0x52494458 /* "RIDX" */ #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 const unsigned char *get_midx_checksum(struct multi_pack_index *m) { return m->data + m->data_len - the_hash_algo->rawsz; } void get_midx_filename(struct strbuf *out, const char *object_dir) { strbuf_addf(out, "%s/pack/multi-pack-index", object_dir); } void get_midx_rev_filename(struct strbuf *out, struct multi_pack_index *m) { get_midx_filename(out, m->object_dir); strbuf_addf(out, "-%s.rev", hash_to_hex(get_midx_checksum(m))); } static int midx_read_oid_fanout(const unsigned char *chunk_start, size_t chunk_size, void *data) { struct multi_pack_index *m = data; m->chunk_oid_fanout = (uint32_t *)chunk_start; if (chunk_size != 4 * 256) { error(_("multi-pack-index OID fanout is of the wrong size")); return 1; } m->num_objects = ntohl(m->chunk_oid_fanout[255]); return 0; } static int midx_read_oid_lookup(const unsigned char *chunk_start, size_t chunk_size, void *data) { struct multi_pack_index *m = data; m->chunk_oid_lookup = chunk_start; if (chunk_size != st_mult(m->hash_len, m->num_objects)) { error(_("multi-pack-index OID lookup chunk is the wrong size")); return 1; } return 0; } 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; struct strbuf midx_name = STRBUF_INIT; uint32_t i; const char *cur_pack_name; struct chunkfile *cf = NULL; get_midx_filename(&midx_name, object_dir); fd = git_open(midx_name.buf); if (fd < 0) goto cleanup_fail; if (fstat(fd, &st)) { error_errno(_("failed to read %s"), midx_name.buf); 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.buf); goto cleanup_fail; } strbuf_release(&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(the_hash_algo)) { error(_("multi-pack-index hash version %u does not match version %u"), hash_version, oid_version(the_hash_algo)); 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); cf = init_chunkfile(NULL); if (read_table_of_contents(cf, m->data, midx_size, MIDX_HEADER_SIZE, m->num_chunks)) goto cleanup_fail; if (pair_chunk_unsafe(cf, MIDX_CHUNKID_PACKNAMES, &m->chunk_pack_names)) die(_("multi-pack-index required pack-name chunk missing or corrupted")); if (read_chunk(cf, MIDX_CHUNKID_OIDFANOUT, midx_read_oid_fanout, m)) die(_("multi-pack-index required OID fanout chunk missing or corrupted")); if (read_chunk(cf, MIDX_CHUNKID_OIDLOOKUP, midx_read_oid_lookup, m)) die(_("multi-pack-index required OID lookup chunk missing or corrupted")); if (pair_chunk_unsafe(cf, MIDX_CHUNKID_OBJECTOFFSETS, &m->chunk_object_offsets)) die(_("multi-pack-index required object offsets chunk missing or corrupted")); pair_chunk_unsafe(cf, MIDX_CHUNKID_LARGEOFFSETS, &m->chunk_large_offsets); if (git_env_bool("GIT_TEST_MIDX_READ_RIDX", 1)) pair_chunk_unsafe(cf, MIDX_CHUNKID_REVINDEX, &m->chunk_revindex); CALLOC_ARRAY(m->pack_names, m->num_packs); CALLOC_ARRAY(m->packs, m->num_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); free_chunkfile(cf); return m; cleanup_fail: free(m); strbuf_release(&midx_name); free_chunkfile(cf); 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; close_midx(m->next); 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); free(m); } 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; oidread(oid, m->chunk_oid_lookup + st_mult(m->hash_len, n)); return oid; } 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 + (off_t)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 + st_mult(sizeof(uint64_t), offset32)); } return offset32; } uint32_t nth_midxed_pack_int_id(struct multi_pack_index *m, uint32_t pos) { return get_be32(m->chunk_object_offsets + (off_t)pos * MIDX_CHUNK_OFFSET_WIDTH); } int fill_midx_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e, struct multi_pack_index *m) { uint32_t pos; uint32_t pack_int_id; struct packed_git *p; if (!bsearch_midx(oid, m, &pos)) return 0; 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)) return 0; 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 (oidset_size(&p->bad_objects) && oidset_contains(&p->bad_objects, oid)) return 0; e->offset = nth_midxed_offset(m, pos); e->p = p; return 1; } /* 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; prepare_repo_settings(r); if (!r->settings.core_multi_pack_index) 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(the_hash_algo)); 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); } static int idx_or_pack_name_cmp(const void *_va, const void *_vb) { const char *pack_name = _va; const struct pack_info *compar = _vb; return cmp_idx_or_pack_name(pack_name, compar->pack_name); } struct write_midx_context { struct pack_info *info; size_t nr; size_t alloc; struct multi_pack_index *m; struct progress *progress; unsigned pack_paths_checked; struct pack_midx_entry *entries; size_t entries_nr; uint32_t *pack_perm; uint32_t *pack_order; unsigned large_offsets_needed:1; uint32_t num_large_offsets; int preferred_pack_idx; struct string_list *to_include; }; static void add_pack_to_midx(const char *full_path, size_t full_path_len, const char *file_name, void *data) { struct write_midx_context *ctx = data; if (ends_with(file_name, ".idx")) { display_progress(ctx->progress, ++ctx->pack_paths_checked); /* * Note that at most one of ctx->m and ctx->to_include are set, * so we are testing midx_contains_pack() and * string_list_has_string() independently (guarded by the * appropriate NULL checks). * * We could support passing to_include while reusing an existing * MIDX, but don't currently since the reuse process drags * forward all packs from an existing MIDX (without checking * whether or not they appear in the to_include list). * * If we added support for that, these next two conditional * should be performed independently (likely checking * to_include before the existing MIDX). */ if (ctx->m && midx_contains_pack(ctx->m, file_name)) return; else if (ctx->to_include && !string_list_has_string(ctx->to_include, file_name)) return; ALLOC_GROW(ctx->info, ctx->nr + 1, ctx->alloc); ctx->info[ctx->nr].p = add_packed_git(full_path, full_path_len, 0); if (!ctx->info[ctx->nr].p) { warning(_("failed to add packfile '%s'"), full_path); return; } if (open_pack_index(ctx->info[ctx->nr].p)) { warning(_("failed to open pack-index '%s'"), full_path); close_pack(ctx->info[ctx->nr].p); FREE_AND_NULL(ctx->info[ctx->nr].p); return; } ctx->info[ctx->nr].pack_name = xstrdup(file_name); ctx->info[ctx->nr].orig_pack_int_id = ctx->nr; ctx->info[ctx->nr].expired = 0; ctx->nr++; } } struct pack_midx_entry { struct object_id oid; uint32_t pack_int_id; time_t pack_mtime; uint64_t offset; unsigned preferred : 1; }; 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; /* Sort objects in a preferred pack first when multiple copies exist. */ if (a->preferred > b->preferred) return -1; if (a->preferred < b->preferred) return 1; 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, int preferred) { 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); entry->preferred = !!preferred; } struct midx_fanout { struct pack_midx_entry *entries; size_t nr, alloc; }; static void midx_fanout_grow(struct midx_fanout *fanout, size_t nr) { if (nr < fanout->nr) BUG("negative growth in midx_fanout_grow() (%"PRIuMAX" < %"PRIuMAX")", (uintmax_t)nr, (uintmax_t)fanout->nr); ALLOC_GROW(fanout->entries, nr, fanout->alloc); } static void midx_fanout_sort(struct midx_fanout *fanout) { QSORT(fanout->entries, fanout->nr, midx_oid_compare); } static void midx_fanout_add_midx_fanout(struct midx_fanout *fanout, struct multi_pack_index *m, uint32_t cur_fanout, int preferred_pack) { uint32_t start = 0, end; uint32_t cur_object; 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++) { if ((preferred_pack > -1) && (preferred_pack == nth_midxed_pack_int_id(m, cur_object))) { /* * Objects from preferred packs are added * separately. */ continue; } midx_fanout_grow(fanout, fanout->nr + 1); nth_midxed_pack_midx_entry(m, &fanout->entries[fanout->nr], cur_object); fanout->entries[fanout->nr].preferred = 0; fanout->nr++; } } static void midx_fanout_add_pack_fanout(struct midx_fanout *fanout, struct pack_info *info, uint32_t cur_pack, int preferred, uint32_t cur_fanout) { struct packed_git *pack = info[cur_pack].p; uint32_t start = 0, end; uint32_t cur_object; if (cur_fanout) start = get_pack_fanout(pack, cur_fanout - 1); end = get_pack_fanout(pack, cur_fanout); for (cur_object = start; cur_object < end; cur_object++) { midx_fanout_grow(fanout, fanout->nr + 1); fill_pack_entry(cur_pack, info[cur_pack].p, cur_object, &fanout->entries[fanout->nr], preferred); fanout->nr++; } } /* * 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, size_t *nr_objects, int preferred_pack) { uint32_t cur_fanout, cur_pack, cur_object; size_t alloc_objects, total_objects = 0; struct midx_fanout fanout = { 0 }; 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 = st_add(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 = fanout.alloc = total_objects > 3200 ? total_objects / 200 : 16; ALLOC_ARRAY(fanout.entries, fanout.alloc); ALLOC_ARRAY(deduplicated_entries, alloc_objects); *nr_objects = 0; for (cur_fanout = 0; cur_fanout < 256; cur_fanout++) { fanout.nr = 0; if (m) midx_fanout_add_midx_fanout(&fanout, m, cur_fanout, preferred_pack); for (cur_pack = start_pack; cur_pack < nr_packs; cur_pack++) { int preferred = cur_pack == preferred_pack; midx_fanout_add_pack_fanout(&fanout, info, cur_pack, preferred, cur_fanout); } if (-1 < preferred_pack && preferred_pack < start_pack) midx_fanout_add_pack_fanout(&fanout, info, preferred_pack, 1, cur_fanout); midx_fanout_sort(&fanout); /* * The batch is now sorted by OID and then mtime (descending). * Take only the first duplicate. */ for (cur_object = 0; cur_object < fanout.nr; cur_object++) { if (cur_object && oideq(&fanout.entries[cur_object - 1].oid, &fanout.entries[cur_object].oid)) continue; ALLOC_GROW(deduplicated_entries, st_add(*nr_objects, 1), alloc_objects); memcpy(&deduplicated_entries[*nr_objects], &fanout.entries[cur_object], sizeof(struct pack_midx_entry)); (*nr_objects)++; } } free(fanout.entries); return deduplicated_entries; } static int write_midx_pack_names(struct hashfile *f, void *data) { struct write_midx_context *ctx = data; uint32_t i; unsigned char padding[MIDX_CHUNK_ALIGNMENT]; size_t written = 0; for (i = 0; i < ctx->nr; i++) { size_t writelen; if (ctx->info[i].expired) continue; if (i && strcmp(ctx->info[i].pack_name, ctx->info[i - 1].pack_name) <= 0) BUG("incorrect pack-file order: %s before %s", ctx->info[i - 1].pack_name, ctx->info[i].pack_name); writelen = strlen(ctx->info[i].pack_name) + 1; hashwrite(f, ctx->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); } return 0; } static int write_midx_oid_fanout(struct hashfile *f, void *data) { struct write_midx_context *ctx = data; struct pack_midx_entry *list = ctx->entries; struct pack_midx_entry *last = ctx->entries + ctx->entries_nr; 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 0; } static int write_midx_oid_lookup(struct hashfile *f, void *data) { struct write_midx_context *ctx = data; unsigned char hash_len = the_hash_algo->rawsz; struct pack_midx_entry *list = ctx->entries; uint32_t i; for (i = 0; i < ctx->entries_nr; i++) { struct pack_midx_entry *obj = list++; if (i < ctx->entries_nr - 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); } return 0; } static int write_midx_object_offsets(struct hashfile *f, void *data) { struct write_midx_context *ctx = data; struct pack_midx_entry *list = ctx->entries; uint32_t i, nr_large_offset = 0; for (i = 0; i < ctx->entries_nr; i++) { struct pack_midx_entry *obj = list++; if (ctx->pack_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, ctx->pack_perm[obj->pack_int_id]); if (ctx->large_offsets_needed && obj->offset >> 31) hashwrite_be32(f, MIDX_LARGE_OFFSET_NEEDED | nr_large_offset++); else if (!ctx->large_offsets_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); } return 0; } static int write_midx_large_offsets(struct hashfile *f, void *data) { struct write_midx_context *ctx = data; struct pack_midx_entry *list = ctx->entries; struct pack_midx_entry *end = ctx->entries + ctx->entries_nr; uint32_t nr_large_offset = ctx->num_large_offsets; 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_be64(f, offset); nr_large_offset--; } return 0; } static int write_midx_revindex(struct hashfile *f, void *data) { struct write_midx_context *ctx = data; uint32_t i; for (i = 0; i < ctx->entries_nr; i++) hashwrite_be32(f, ctx->pack_order[i]); return 0; } struct midx_pack_order_data { uint32_t nr; uint32_t pack; off_t offset; }; static int midx_pack_order_cmp(const void *va, const void *vb) { const struct midx_pack_order_data *a = va, *b = vb; if (a->pack < b->pack) return -1; else if (a->pack > b->pack) return 1; else if (a->offset < b->offset) return -1; else if (a->offset > b->offset) return 1; else return 0; } static uint32_t *midx_pack_order(struct write_midx_context *ctx) { struct midx_pack_order_data *data; uint32_t *pack_order; uint32_t i; trace2_region_enter("midx", "midx_pack_order", the_repository); ALLOC_ARRAY(data, ctx->entries_nr); for (i = 0; i < ctx->entries_nr; i++) { struct pack_midx_entry *e = &ctx->entries[i]; data[i].nr = i; data[i].pack = ctx->pack_perm[e->pack_int_id]; if (!e->preferred) data[i].pack |= (1U << 31); data[i].offset = e->offset; } QSORT(data, ctx->entries_nr, midx_pack_order_cmp); ALLOC_ARRAY(pack_order, ctx->entries_nr); for (i = 0; i < ctx->entries_nr; i++) pack_order[i] = data[i].nr; free(data); trace2_region_leave("midx", "midx_pack_order", the_repository); return pack_order; } static void write_midx_reverse_index(char *midx_name, unsigned char *midx_hash, struct write_midx_context *ctx) { struct strbuf buf = STRBUF_INIT; const char *tmp_file; trace2_region_enter("midx", "write_midx_reverse_index", the_repository); strbuf_addf(&buf, "%s-%s.rev", midx_name, hash_to_hex(midx_hash)); tmp_file = write_rev_file_order(NULL, ctx->pack_order, ctx->entries_nr, midx_hash, WRITE_REV); if (finalize_object_file(tmp_file, buf.buf)) die(_("cannot store reverse index file")); strbuf_release(&buf); trace2_region_leave("midx", "write_midx_reverse_index", the_repository); } static void clear_midx_files_ext(const char *object_dir, const char *ext, unsigned char *keep_hash); static int midx_checksum_valid(struct multi_pack_index *m) { return hashfile_checksum_valid(m->data, m->data_len); } static void prepare_midx_packing_data(struct packing_data *pdata, struct write_midx_context *ctx) { uint32_t i; trace2_region_enter("midx", "prepare_midx_packing_data", the_repository); memset(pdata, 0, sizeof(struct packing_data)); prepare_packing_data(the_repository, pdata); for (i = 0; i < ctx->entries_nr; i++) { struct pack_midx_entry *from = &ctx->entries[ctx->pack_order[i]]; struct object_entry *to = packlist_alloc(pdata, &from->oid); oe_set_in_pack(pdata, to, ctx->info[ctx->pack_perm[from->pack_int_id]].p); } trace2_region_leave("midx", "prepare_midx_packing_data", the_repository); } static int add_ref_to_pending(const char *refname, const struct object_id *oid, int flag, void *cb_data) { struct rev_info *revs = (struct rev_info*)cb_data; struct object_id peeled; struct object *object; if ((flag & REF_ISSYMREF) && (flag & REF_ISBROKEN)) { warning("symbolic ref is dangling: %s", refname); return 0; } if (!peel_iterated_oid(oid, &peeled)) oid = &peeled; object = parse_object_or_die(oid, refname); if (object->type != OBJ_COMMIT) return 0; add_pending_object(revs, object, ""); if (bitmap_is_preferred_refname(revs->repo, refname)) object->flags |= NEEDS_BITMAP; return 0; } struct bitmap_commit_cb { struct commit **commits; size_t commits_nr, commits_alloc; struct write_midx_context *ctx; }; static const struct object_id *bitmap_oid_access(size_t index, const void *_entries) { const struct pack_midx_entry *entries = _entries; return &entries[index].oid; } static void bitmap_show_commit(struct commit *commit, void *_data) { struct bitmap_commit_cb *data = _data; int pos = oid_pos(&commit->object.oid, data->ctx->entries, data->ctx->entries_nr, bitmap_oid_access); if (pos < 0) return; ALLOC_GROW(data->commits, data->commits_nr + 1, data->commits_alloc); data->commits[data->commits_nr++] = commit; } static int read_refs_snapshot(const char *refs_snapshot, struct rev_info *revs) { struct strbuf buf = STRBUF_INIT; struct object_id oid; FILE *f = xfopen(refs_snapshot, "r"); while (strbuf_getline(&buf, f) != EOF) { struct object *object; int preferred = 0; char *hex = buf.buf; const char *end = NULL; if (buf.len && *buf.buf == '+') { preferred = 1; hex = &buf.buf[1]; } if (parse_oid_hex(hex, &oid, &end) < 0) die(_("could not parse line: %s"), buf.buf); if (*end) die(_("malformed line: %s"), buf.buf); object = parse_object_or_die(&oid, NULL); if (preferred) object->flags |= NEEDS_BITMAP; add_pending_object(revs, object, ""); } fclose(f); strbuf_release(&buf); return 0; } static struct commit **find_commits_for_midx_bitmap(uint32_t *indexed_commits_nr_p, const char *refs_snapshot, struct write_midx_context *ctx) { struct rev_info revs; struct bitmap_commit_cb cb = {0}; trace2_region_enter("midx", "find_commits_for_midx_bitmap", the_repository); cb.ctx = ctx; repo_init_revisions(the_repository, &revs, NULL); if (refs_snapshot) { read_refs_snapshot(refs_snapshot, &revs); } else { setup_revisions(0, NULL, &revs, NULL); for_each_ref(add_ref_to_pending, &revs); } /* * Skipping promisor objects here is intentional, since it only excludes * them from the list of reachable commits that we want to select from * when computing the selection of MIDX'd commits to receive bitmaps. * * Reachability bitmaps do require that their objects be closed under * reachability, but fetching any objects missing from promisors at this * point is too late. But, if one of those objects can be reached from * an another object that is included in the bitmap, then we will * complain later that we don't have reachability closure (and fail * appropriately). */ fetch_if_missing = 0; revs.exclude_promisor_objects = 1; if (prepare_revision_walk(&revs)) die(_("revision walk setup failed")); traverse_commit_list(&revs, bitmap_show_commit, NULL, &cb); if (indexed_commits_nr_p) *indexed_commits_nr_p = cb.commits_nr; release_revisions(&revs); trace2_region_leave("midx", "find_commits_for_midx_bitmap", the_repository); return cb.commits; } static int write_midx_bitmap(const char *midx_name, const unsigned char *midx_hash, struct packing_data *pdata, struct commit **commits, uint32_t commits_nr, uint32_t *pack_order, unsigned flags) { int ret, i; uint16_t options = 0; struct pack_idx_entry **index; char *bitmap_name = xstrfmt("%s-%s.bitmap", midx_name, hash_to_hex(midx_hash)); trace2_region_enter("midx", "write_midx_bitmap", the_repository); if (flags & MIDX_WRITE_BITMAP_HASH_CACHE) options |= BITMAP_OPT_HASH_CACHE; if (flags & MIDX_WRITE_BITMAP_LOOKUP_TABLE) options |= BITMAP_OPT_LOOKUP_TABLE; /* * Build the MIDX-order index based on pdata.objects (which is already * in MIDX order; c.f., 'midx_pack_order_cmp()' for the definition of * this order). */ ALLOC_ARRAY(index, pdata->nr_objects); for (i = 0; i < pdata->nr_objects; i++) index[i] = &pdata->objects[i].idx; bitmap_writer_show_progress(flags & MIDX_PROGRESS); bitmap_writer_build_type_index(pdata, index, pdata->nr_objects); /* * bitmap_writer_finish expects objects in lex order, but pack_order * gives us exactly that. use it directly instead of re-sorting the * array. * * This changes the order of objects in 'index' between * bitmap_writer_build_type_index and bitmap_writer_finish. * * The same re-ordering takes place in the single-pack bitmap code via * write_idx_file(), which is called by finish_tmp_packfile(), which * happens between bitmap_writer_build_type_index() and * bitmap_writer_finish(). */ for (i = 0; i < pdata->nr_objects; i++) index[pack_order[i]] = &pdata->objects[i].idx; bitmap_writer_select_commits(commits, commits_nr, -1); ret = bitmap_writer_build(pdata); if (ret < 0) goto cleanup; bitmap_writer_set_checksum(midx_hash); bitmap_writer_finish(index, pdata->nr_objects, bitmap_name, options); cleanup: free(index); free(bitmap_name); trace2_region_leave("midx", "write_midx_bitmap", the_repository); return ret; } static struct multi_pack_index *lookup_multi_pack_index(struct repository *r, const char *object_dir) { struct multi_pack_index *result = NULL; struct multi_pack_index *cur; char *obj_dir_real = real_pathdup(object_dir, 1); struct strbuf cur_path_real = STRBUF_INIT; /* Ensure the given object_dir is local, or a known alternate. */ find_odb(r, obj_dir_real); for (cur = get_multi_pack_index(r); cur; cur = cur->next) { strbuf_realpath(&cur_path_real, cur->object_dir, 1); if (!strcmp(obj_dir_real, cur_path_real.buf)) { result = cur; goto cleanup; } } cleanup: free(obj_dir_real); strbuf_release(&cur_path_real); return result; } static int write_midx_internal(const char *object_dir, struct string_list *packs_to_include, struct string_list *packs_to_drop, const char *preferred_pack_name, const char *refs_snapshot, unsigned flags) { struct strbuf midx_name = STRBUF_INIT; unsigned char midx_hash[GIT_MAX_RAWSZ]; uint32_t i; struct hashfile *f = NULL; struct lock_file lk; struct write_midx_context ctx = { 0 }; int pack_name_concat_len = 0; int dropped_packs = 0; int result = 0; struct chunkfile *cf; trace2_region_enter("midx", "write_midx_internal", the_repository); get_midx_filename(&midx_name, object_dir); if (safe_create_leading_directories(midx_name.buf)) die_errno(_("unable to create leading directories of %s"), midx_name.buf); if (!packs_to_include) { /* * Only reference an existing MIDX when not filtering which * packs to include, since all packs and objects are copied * blindly from an existing MIDX if one is present. */ ctx.m = lookup_multi_pack_index(the_repository, object_dir); } if (ctx.m && !midx_checksum_valid(ctx.m)) { warning(_("ignoring existing multi-pack-index; checksum mismatch")); ctx.m = NULL; } ctx.nr = 0; ctx.alloc = ctx.m ? ctx.m->num_packs : 16; ctx.info = NULL; ALLOC_ARRAY(ctx.info, ctx.alloc); if (ctx.m) { for (i = 0; i < ctx.m->num_packs; i++) { ALLOC_GROW(ctx.info, ctx.nr + 1, ctx.alloc); ctx.info[ctx.nr].orig_pack_int_id = i; ctx.info[ctx.nr].pack_name = xstrdup(ctx.m->pack_names[i]); ctx.info[ctx.nr].p = ctx.m->packs[i]; ctx.info[ctx.nr].expired = 0; if (flags & MIDX_WRITE_REV_INDEX) { /* * If generating a reverse index, need to have * packed_git's loaded to compare their * mtimes and object count. */ if (prepare_midx_pack(the_repository, ctx.m, i)) { error(_("could not load pack")); result = 1; goto cleanup; } if (open_pack_index(ctx.m->packs[i])) die(_("could not open index for %s"), ctx.m->packs[i]->pack_name); ctx.info[ctx.nr].p = ctx.m->packs[i]; } ctx.nr++; } } ctx.pack_paths_checked = 0; if (flags & MIDX_PROGRESS) ctx.progress = start_delayed_progress(_("Adding packfiles to multi-pack-index"), 0); else ctx.progress = NULL; ctx.to_include = packs_to_include; for_each_file_in_pack_dir(object_dir, add_pack_to_midx, &ctx); stop_progress(&ctx.progress); if ((ctx.m && ctx.nr == ctx.m->num_packs) && !(packs_to_include || packs_to_drop)) { struct bitmap_index *bitmap_git; int bitmap_exists; int want_bitmap = flags & MIDX_WRITE_BITMAP; bitmap_git = prepare_midx_bitmap_git(ctx.m); bitmap_exists = bitmap_git && bitmap_is_midx(bitmap_git); free_bitmap_index(bitmap_git); if (bitmap_exists || !want_bitmap) { /* * The correct MIDX already exists, and so does a * corresponding bitmap (or one wasn't requested). */ if (!want_bitmap) clear_midx_files_ext(object_dir, ".bitmap", NULL); goto cleanup; } } if (preferred_pack_name) { ctx.preferred_pack_idx = -1; for (i = 0; i < ctx.nr; i++) { if (!cmp_idx_or_pack_name(preferred_pack_name, ctx.info[i].pack_name)) { ctx.preferred_pack_idx = i; break; } } if (ctx.preferred_pack_idx == -1) warning(_("unknown preferred pack: '%s'"), preferred_pack_name); } else if (ctx.nr && (flags & (MIDX_WRITE_REV_INDEX | MIDX_WRITE_BITMAP))) { struct packed_git *oldest = ctx.info[ctx.preferred_pack_idx].p; ctx.preferred_pack_idx = 0; if (packs_to_drop && packs_to_drop->nr) BUG("cannot write a MIDX bitmap during expiration"); /* * set a preferred pack when writing a bitmap to ensure that * the pack from which the first object is selected in pseudo * pack-order has all of its objects selected from that pack * (and not another pack containing a duplicate) */ for (i = 1; i < ctx.nr; i++) { struct packed_git *p = ctx.info[i].p; if (!oldest->num_objects || p->mtime < oldest->mtime) { oldest = p; ctx.preferred_pack_idx = i; } } if (!oldest->num_objects) { /* * If all packs are empty; unset the preferred index. * This is acceptable since there will be no duplicate * objects to resolve, so the preferred value doesn't * matter. */ ctx.preferred_pack_idx = -1; } } else { /* * otherwise don't mark any pack as preferred to avoid * interfering with expiration logic below */ ctx.preferred_pack_idx = -1; } if (ctx.preferred_pack_idx > -1) { struct packed_git *preferred = ctx.info[ctx.preferred_pack_idx].p; if (!preferred->num_objects) { error(_("cannot select preferred pack %s with no objects"), preferred->pack_name); result = 1; goto cleanup; } } ctx.entries = get_sorted_entries(ctx.m, ctx.info, ctx.nr, &ctx.entries_nr, ctx.preferred_pack_idx); ctx.large_offsets_needed = 0; for (i = 0; i < ctx.entries_nr; i++) { if (ctx.entries[i].offset > 0x7fffffff) ctx.num_large_offsets++; if (ctx.entries[i].offset > 0xffffffff) ctx.large_offsets_needed = 1; } QSORT(ctx.info, ctx.nr, pack_info_compare); if (packs_to_drop && packs_to_drop->nr) { int drop_index = 0; int missing_drops = 0; for (i = 0; i < ctx.nr && drop_index < packs_to_drop->nr; i++) { int cmp = strcmp(ctx.info[i].pack_name, packs_to_drop->items[drop_index].string); if (!cmp) { drop_index++; ctx.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 { ctx.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(ctx.pack_perm, ctx.nr); for (i = 0; i < ctx.nr; i++) { if (ctx.info[i].expired) { dropped_packs++; ctx.pack_perm[ctx.info[i].orig_pack_int_id] = PACK_EXPIRED; } else { ctx.pack_perm[ctx.info[i].orig_pack_int_id] = i - dropped_packs; } } for (i = 0; i < ctx.nr; i++) { if (!ctx.info[i].expired) pack_name_concat_len += strlen(ctx.info[i].pack_name) + 1; } /* Check that the preferred pack wasn't expired (if given). */ if (preferred_pack_name) { struct pack_info *preferred = bsearch(preferred_pack_name, ctx.info, ctx.nr, sizeof(*ctx.info), idx_or_pack_name_cmp); if (preferred) { uint32_t perm = ctx.pack_perm[preferred->orig_pack_int_id]; if (perm == PACK_EXPIRED) warning(_("preferred pack '%s' is expired"), preferred_pack_name); } } 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.buf, LOCK_DIE_ON_ERROR); f = hashfd(get_lock_file_fd(&lk), get_lock_file_path(&lk)); if (ctx.nr - dropped_packs == 0) { error(_("no pack files to index.")); result = 1; goto cleanup; } if (!ctx.entries_nr) { if (flags & MIDX_WRITE_BITMAP) warning(_("refusing to write multi-pack .bitmap without any objects")); flags &= ~(MIDX_WRITE_REV_INDEX | MIDX_WRITE_BITMAP); } cf = init_chunkfile(f); add_chunk(cf, MIDX_CHUNKID_PACKNAMES, pack_name_concat_len, write_midx_pack_names); add_chunk(cf, MIDX_CHUNKID_OIDFANOUT, MIDX_CHUNK_FANOUT_SIZE, write_midx_oid_fanout); add_chunk(cf, MIDX_CHUNKID_OIDLOOKUP, st_mult(ctx.entries_nr, the_hash_algo->rawsz), write_midx_oid_lookup); add_chunk(cf, MIDX_CHUNKID_OBJECTOFFSETS, st_mult(ctx.entries_nr, MIDX_CHUNK_OFFSET_WIDTH), write_midx_object_offsets); if (ctx.large_offsets_needed) add_chunk(cf, MIDX_CHUNKID_LARGEOFFSETS, st_mult(ctx.num_large_offsets, MIDX_CHUNK_LARGE_OFFSET_WIDTH), write_midx_large_offsets); if (flags & (MIDX_WRITE_REV_INDEX | MIDX_WRITE_BITMAP)) { ctx.pack_order = midx_pack_order(&ctx); add_chunk(cf, MIDX_CHUNKID_REVINDEX, st_mult(ctx.entries_nr, sizeof(uint32_t)), write_midx_revindex); } write_midx_header(f, get_num_chunks(cf), ctx.nr - dropped_packs); write_chunkfile(cf, &ctx); finalize_hashfile(f, midx_hash, FSYNC_COMPONENT_PACK_METADATA, CSUM_FSYNC | CSUM_HASH_IN_STREAM); free_chunkfile(cf); if (flags & MIDX_WRITE_REV_INDEX && git_env_bool("GIT_TEST_MIDX_WRITE_REV", 0)) write_midx_reverse_index(midx_name.buf, midx_hash, &ctx); if (flags & MIDX_WRITE_BITMAP) { struct packing_data pdata; struct commit **commits; uint32_t commits_nr; if (!ctx.entries_nr) BUG("cannot write a bitmap without any objects"); prepare_midx_packing_data(&pdata, &ctx); commits = find_commits_for_midx_bitmap(&commits_nr, refs_snapshot, &ctx); /* * The previous steps translated the information from * 'entries' into information suitable for constructing * bitmaps. We no longer need that array, so clear it to * reduce memory pressure. */ FREE_AND_NULL(ctx.entries); ctx.entries_nr = 0; if (write_midx_bitmap(midx_name.buf, midx_hash, &pdata, commits, commits_nr, ctx.pack_order, flags) < 0) { error(_("could not write multi-pack bitmap")); result = 1; goto cleanup; } } /* * NOTE: Do not use ctx.entries beyond this point, since it might * have been freed in the previous if block. */ if (ctx.m) close_object_store(the_repository->objects); if (commit_lock_file(&lk) < 0) die_errno(_("could not write multi-pack-index")); clear_midx_files_ext(object_dir, ".bitmap", midx_hash); clear_midx_files_ext(object_dir, ".rev", midx_hash); cleanup: for (i = 0; i < ctx.nr; i++) { if (ctx.info[i].p) { close_pack(ctx.info[i].p); free(ctx.info[i].p); } free(ctx.info[i].pack_name); } free(ctx.info); free(ctx.entries); free(ctx.pack_perm); free(ctx.pack_order); strbuf_release(&midx_name); trace2_region_leave("midx", "write_midx_internal", the_repository); return result; } int write_midx_file(const char *object_dir, const char *preferred_pack_name, const char *refs_snapshot, unsigned flags) { return write_midx_internal(object_dir, NULL, NULL, preferred_pack_name, refs_snapshot, flags); } int write_midx_file_only(const char *object_dir, struct string_list *packs_to_include, const char *preferred_pack_name, const char *refs_snapshot, unsigned flags) { return write_midx_internal(object_dir, packs_to_include, NULL, preferred_pack_name, refs_snapshot, flags); } struct clear_midx_data { char *keep; const char *ext; }; static void clear_midx_file_ext(const char *full_path, size_t full_path_len UNUSED, const char *file_name, void *_data) { struct clear_midx_data *data = _data; if (!(starts_with(file_name, "multi-pack-index-") && ends_with(file_name, data->ext))) return; if (data->keep && !strcmp(data->keep, file_name)) return; if (unlink(full_path)) die_errno(_("failed to remove %s"), full_path); } static void clear_midx_files_ext(const char *object_dir, const char *ext, unsigned char *keep_hash) { struct clear_midx_data data; memset(&data, 0, sizeof(struct clear_midx_data)); if (keep_hash) data.keep = xstrfmt("multi-pack-index-%s%s", hash_to_hex(keep_hash), ext); data.ext = ext; for_each_file_in_pack_dir(object_dir, clear_midx_file_ext, &data); free(data.keep); } void clear_midx_file(struct repository *r) { struct strbuf midx = STRBUF_INIT; get_midx_filename(&midx, 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.buf)) die(_("failed to clear multi-pack-index at %s"), midx.buf); clear_midx_files_ext(r->objects->odb->path, ".bitmap", NULL); clear_midx_files_ext(r->objects->odb->path, ".rev", NULL); strbuf_release(&midx); } static int verify_midx_error; __attribute__((format (printf, 1, 2))) 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; struct strbuf filename = STRBUF_INIT; get_midx_filename(&filename, object_dir); if (!stat(filename.buf, &sb)) { error(_("multi-pack-index file exists, but failed to parse")); result = 1; } strbuf_release(&filename); return result; } if (!midx_checksum_valid(m)) midx_report(_("incorrect checksum")); if (flags & MIDX_PROGRESS) progress = start_delayed_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. */ goto cleanup; } 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); cleanup: free(pairs); close_midx(m); 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 = lookup_multi_pack_index(r, object_dir); struct progress *progress = NULL; if (!m) return 0; CALLOC_ARRAY(count, m->num_packs); if (flags & MIDX_PROGRESS) progress = start_delayed_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_delayed_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 || m->packs[i]->is_cruft) 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, NULL, &packs_to_drop, NULL, NULL, 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; if (m->packs[i]->is_cruft) 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; int pack_kept_objects = 0; CALLOC_ARRAY(pack_info, m->num_packs); 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; 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 (p->is_cruft) continue; if (open_pack_index(p) || !p->num_objects) continue; expected_size = st_mult(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 = lookup_multi_pack_index(r, object_dir); /* * 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; CALLOC_ARRAY(include_pack, m->num_packs); 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, NULL, NULL, NULL, NULL, flags); cleanup: free(include_pack); return result; }