diff options
Diffstat (limited to 'third_party/git/builtin/index-pack.c')
| -rw-r--r-- | third_party/git/builtin/index-pack.c | 1908 |
1 files changed, 0 insertions, 1908 deletions
diff --git a/third_party/git/builtin/index-pack.c b/third_party/git/builtin/index-pack.c deleted file mode 100644 index 0d03cb442df3..000000000000 --- a/third_party/git/builtin/index-pack.c +++ /dev/null @@ -1,1908 +0,0 @@ -#include "builtin.h" -#include "config.h" -#include "delta.h" -#include "pack.h" -#include "csum-file.h" -#include "blob.h" -#include "commit.h" -#include "tag.h" -#include "tree.h" -#include "progress.h" -#include "fsck.h" -#include "exec-cmd.h" -#include "streaming.h" -#include "thread-utils.h" -#include "packfile.h" -#include "object-store.h" -#include "promisor-remote.h" - -static const char index_pack_usage[] = -"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])"; - -struct object_entry { - struct pack_idx_entry idx; - unsigned long size; - unsigned char hdr_size; - signed char type; - signed char real_type; -}; - -struct object_stat { - unsigned delta_depth; - int base_object_no; -}; - -struct base_data { - /* Initialized by make_base(). */ - struct base_data *base; - struct object_entry *obj; - int ref_first, ref_last; - int ofs_first, ofs_last; - /* - * Threads should increment retain_data if they are about to call - * patch_delta() using this struct's data as a base, and decrement this - * when they are done. While retain_data is nonzero, this struct's data - * will not be freed even if the delta base cache limit is exceeded. - */ - int retain_data; - /* - * The number of direct children that have not been fully processed - * (entered work_head, entered done_head, left done_head). When this - * number reaches zero, this struct base_data can be freed. - */ - int children_remaining; - - /* Not initialized by make_base(). */ - struct list_head list; - void *data; - unsigned long size; -}; - -/* - * Stack of struct base_data that have unprocessed children. - * threaded_second_pass() uses this as a source of work (the other being the - * objects array). - * - * Guarded by work_mutex. - */ -static LIST_HEAD(work_head); - -/* - * Stack of struct base_data that have children, all of whom have been - * processed or are being processed, and at least one child is being processed. - * These struct base_data must be kept around until the last child is - * processed. - * - * Guarded by work_mutex. - */ -static LIST_HEAD(done_head); - -/* - * All threads share one delta base cache. - * - * base_cache_used is guarded by work_mutex, and base_cache_limit is read-only - * in a thread. - */ -static size_t base_cache_used; -static size_t base_cache_limit; - -struct thread_local { - pthread_t thread; - int pack_fd; -}; - -/* Remember to update object flag allocation in object.h */ -#define FLAG_LINK (1u<<20) -#define FLAG_CHECKED (1u<<21) - -struct ofs_delta_entry { - off_t offset; - int obj_no; -}; - -struct ref_delta_entry { - struct object_id oid; - int obj_no; -}; - -static struct object_entry *objects; -static struct object_stat *obj_stat; -static struct ofs_delta_entry *ofs_deltas; -static struct ref_delta_entry *ref_deltas; -static struct thread_local nothread_data; -static int nr_objects; -static int nr_ofs_deltas; -static int nr_ref_deltas; -static int ref_deltas_alloc; -static int nr_resolved_deltas; -static int nr_threads; - -static int from_stdin; -static int strict; -static int do_fsck_object; -static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT; -static int verbose; -static int show_resolving_progress; -static int show_stat; -static int check_self_contained_and_connected; - -static struct progress *progress; - -/* We always read in 4kB chunks. */ -static unsigned char input_buffer[4096]; -static unsigned int input_offset, input_len; -static off_t consumed_bytes; -static off_t max_input_size; -static unsigned deepest_delta; -static git_hash_ctx input_ctx; -static uint32_t input_crc32; -static int input_fd, output_fd; -static const char *curr_pack; - -static struct thread_local *thread_data; -static int nr_dispatched; -static int threads_active; - -static pthread_mutex_t read_mutex; -#define read_lock() lock_mutex(&read_mutex) -#define read_unlock() unlock_mutex(&read_mutex) - -static pthread_mutex_t counter_mutex; -#define counter_lock() lock_mutex(&counter_mutex) -#define counter_unlock() unlock_mutex(&counter_mutex) - -static pthread_mutex_t work_mutex; -#define work_lock() lock_mutex(&work_mutex) -#define work_unlock() unlock_mutex(&work_mutex) - -static pthread_mutex_t deepest_delta_mutex; -#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex) -#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex) - -static pthread_key_t key; - -static inline void lock_mutex(pthread_mutex_t *mutex) -{ - if (threads_active) - pthread_mutex_lock(mutex); -} - -static inline void unlock_mutex(pthread_mutex_t *mutex) -{ - if (threads_active) - pthread_mutex_unlock(mutex); -} - -/* - * Mutex and conditional variable can't be statically-initialized on Windows. - */ -static void init_thread(void) -{ - int i; - init_recursive_mutex(&read_mutex); - pthread_mutex_init(&counter_mutex, NULL); - pthread_mutex_init(&work_mutex, NULL); - if (show_stat) - pthread_mutex_init(&deepest_delta_mutex, NULL); - pthread_key_create(&key, NULL); - thread_data = xcalloc(nr_threads, sizeof(*thread_data)); - for (i = 0; i < nr_threads; i++) { - thread_data[i].pack_fd = open(curr_pack, O_RDONLY); - if (thread_data[i].pack_fd == -1) - die_errno(_("unable to open %s"), curr_pack); - } - - threads_active = 1; -} - -static void cleanup_thread(void) -{ - int i; - if (!threads_active) - return; - threads_active = 0; - pthread_mutex_destroy(&read_mutex); - pthread_mutex_destroy(&counter_mutex); - pthread_mutex_destroy(&work_mutex); - if (show_stat) - pthread_mutex_destroy(&deepest_delta_mutex); - for (i = 0; i < nr_threads; i++) - close(thread_data[i].pack_fd); - pthread_key_delete(key); - free(thread_data); -} - -static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options) -{ - if (!obj) - return -1; - - if (type != OBJ_ANY && obj->type != type) - die(_("object type mismatch at %s"), oid_to_hex(&obj->oid)); - - obj->flags |= FLAG_LINK; - return 0; -} - -/* The content of each linked object must have been checked - or it must be already present in the object database */ -static unsigned check_object(struct object *obj) -{ - if (!obj) - return 0; - - if (!(obj->flags & FLAG_LINK)) - return 0; - - if (!(obj->flags & FLAG_CHECKED)) { - unsigned long size; - int type = oid_object_info(the_repository, &obj->oid, &size); - if (type <= 0) - die(_("did not receive expected object %s"), - oid_to_hex(&obj->oid)); - if (type != obj->type) - die(_("object %s: expected type %s, found %s"), - oid_to_hex(&obj->oid), - type_name(obj->type), type_name(type)); - obj->flags |= FLAG_CHECKED; - return 1; - } - - return 0; -} - -static unsigned check_objects(void) -{ - unsigned i, max, foreign_nr = 0; - - max = get_max_object_index(); - - if (verbose) - progress = start_delayed_progress(_("Checking objects"), max); - - for (i = 0; i < max; i++) { - foreign_nr += check_object(get_indexed_object(i)); - display_progress(progress, i + 1); - } - - stop_progress(&progress); - return foreign_nr; -} - - -/* Discard current buffer used content. */ -static void flush(void) -{ - if (input_offset) { - if (output_fd >= 0) - write_or_die(output_fd, input_buffer, input_offset); - the_hash_algo->update_fn(&input_ctx, input_buffer, input_offset); - memmove(input_buffer, input_buffer + input_offset, input_len); - input_offset = 0; - } -} - -/* - * Make sure at least "min" bytes are available in the buffer, and - * return the pointer to the buffer. - */ -static void *fill(int min) -{ - if (min <= input_len) - return input_buffer + input_offset; - if (min > sizeof(input_buffer)) - die(Q_("cannot fill %d byte", - "cannot fill %d bytes", - min), - min); - flush(); - do { - ssize_t ret = xread(input_fd, input_buffer + input_len, - sizeof(input_buffer) - input_len); - if (ret <= 0) { - if (!ret) - die(_("early EOF")); - die_errno(_("read error on input")); - } - input_len += ret; - if (from_stdin) - display_throughput(progress, consumed_bytes + input_len); - } while (input_len < min); - return input_buffer; -} - -static void use(int bytes) -{ - if (bytes > input_len) - die(_("used more bytes than were available")); - input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes); - input_len -= bytes; - input_offset += bytes; - - /* make sure off_t is sufficiently large not to wrap */ - if (signed_add_overflows(consumed_bytes, bytes)) - die(_("pack too large for current definition of off_t")); - consumed_bytes += bytes; - if (max_input_size && consumed_bytes > max_input_size) - die(_("pack exceeds maximum allowed size")); -} - -static const char *open_pack_file(const char *pack_name) -{ - if (from_stdin) { - input_fd = 0; - if (!pack_name) { - struct strbuf tmp_file = STRBUF_INIT; - output_fd = odb_mkstemp(&tmp_file, - "pack/tmp_pack_XXXXXX"); - pack_name = strbuf_detach(&tmp_file, NULL); - } else { - output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600); - if (output_fd < 0) - die_errno(_("unable to create '%s'"), pack_name); - } - nothread_data.pack_fd = output_fd; - } else { - input_fd = open(pack_name, O_RDONLY); - if (input_fd < 0) - die_errno(_("cannot open packfile '%s'"), pack_name); - output_fd = -1; - nothread_data.pack_fd = input_fd; - } - the_hash_algo->init_fn(&input_ctx); - return pack_name; -} - -static void parse_pack_header(void) -{ - struct pack_header *hdr = fill(sizeof(struct pack_header)); - - /* Header consistency check */ - if (hdr->hdr_signature != htonl(PACK_SIGNATURE)) - die(_("pack signature mismatch")); - if (!pack_version_ok(hdr->hdr_version)) - die(_("pack version %"PRIu32" unsupported"), - ntohl(hdr->hdr_version)); - - nr_objects = ntohl(hdr->hdr_entries); - use(sizeof(struct pack_header)); -} - -static NORETURN void bad_object(off_t offset, const char *format, - ...) __attribute__((format (printf, 2, 3))); - -static NORETURN void bad_object(off_t offset, const char *format, ...) -{ - va_list params; - char buf[1024]; - - va_start(params, format); - vsnprintf(buf, sizeof(buf), format, params); - va_end(params); - die(_("pack has bad object at offset %"PRIuMAX": %s"), - (uintmax_t)offset, buf); -} - -static inline struct thread_local *get_thread_data(void) -{ - if (HAVE_THREADS) { - if (threads_active) - return pthread_getspecific(key); - assert(!threads_active && - "This should only be reached when all threads are gone"); - } - return ¬hread_data; -} - -static void set_thread_data(struct thread_local *data) -{ - if (threads_active) - pthread_setspecific(key, data); -} - -static void free_base_data(struct base_data *c) -{ - if (c->data) { - FREE_AND_NULL(c->data); - base_cache_used -= c->size; - } -} - -static void prune_base_data(struct base_data *retain) -{ - struct list_head *pos; - - if (base_cache_used <= base_cache_limit) - return; - - list_for_each_prev(pos, &done_head) { - struct base_data *b = list_entry(pos, struct base_data, list); - if (b->retain_data || b == retain) - continue; - if (b->data) { - free_base_data(b); - if (base_cache_used <= base_cache_limit) - return; - } - } - - list_for_each_prev(pos, &work_head) { - struct base_data *b = list_entry(pos, struct base_data, list); - if (b->retain_data || b == retain) - continue; - if (b->data) { - free_base_data(b); - if (base_cache_used <= base_cache_limit) - return; - } - } -} - -static int is_delta_type(enum object_type type) -{ - return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA); -} - -static void *unpack_entry_data(off_t offset, unsigned long size, - enum object_type type, struct object_id *oid) -{ - static char fixed_buf[8192]; - int status; - git_zstream stream; - void *buf; - git_hash_ctx c; - char hdr[32]; - int hdrlen; - - if (!is_delta_type(type)) { - hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX, - type_name(type),(uintmax_t)size) + 1; - the_hash_algo->init_fn(&c); - the_hash_algo->update_fn(&c, hdr, hdrlen); - } else - oid = NULL; - if (type == OBJ_BLOB && size > big_file_threshold) - buf = fixed_buf; - else - buf = xmallocz(size); - - memset(&stream, 0, sizeof(stream)); - git_inflate_init(&stream); - stream.next_out = buf; - stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size; - - do { - unsigned char *last_out = stream.next_out; - stream.next_in = fill(1); - stream.avail_in = input_len; - status = git_inflate(&stream, 0); - use(input_len - stream.avail_in); - if (oid) - the_hash_algo->update_fn(&c, last_out, stream.next_out - last_out); - if (buf == fixed_buf) { - stream.next_out = buf; - stream.avail_out = sizeof(fixed_buf); - } - } while (status == Z_OK); - if (stream.total_out != size || status != Z_STREAM_END) - bad_object(offset, _("inflate returned %d"), status); - git_inflate_end(&stream); - if (oid) - the_hash_algo->final_fn(oid->hash, &c); - return buf == fixed_buf ? NULL : buf; -} - -static void *unpack_raw_entry(struct object_entry *obj, - off_t *ofs_offset, - struct object_id *ref_oid, - struct object_id *oid) -{ - unsigned char *p; - unsigned long size, c; - off_t base_offset; - unsigned shift; - void *data; - - obj->idx.offset = consumed_bytes; - input_crc32 = crc32(0, NULL, 0); - - p = fill(1); - c = *p; - use(1); - obj->type = (c >> 4) & 7; - size = (c & 15); - shift = 4; - while (c & 0x80) { - p = fill(1); - c = *p; - use(1); - size += (c & 0x7f) << shift; - shift += 7; - } - obj->size = size; - - switch (obj->type) { - case OBJ_REF_DELTA: - hashcpy(ref_oid->hash, fill(the_hash_algo->rawsz)); - use(the_hash_algo->rawsz); - break; - case OBJ_OFS_DELTA: - p = fill(1); - c = *p; - use(1); - base_offset = c & 127; - while (c & 128) { - base_offset += 1; - if (!base_offset || MSB(base_offset, 7)) - bad_object(obj->idx.offset, _("offset value overflow for delta base object")); - p = fill(1); - c = *p; - use(1); - base_offset = (base_offset << 7) + (c & 127); - } - *ofs_offset = obj->idx.offset - base_offset; - if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset) - bad_object(obj->idx.offset, _("delta base offset is out of bound")); - break; - case OBJ_COMMIT: - case OBJ_TREE: - case OBJ_BLOB: - case OBJ_TAG: - break; - default: - bad_object(obj->idx.offset, _("unknown object type %d"), obj->type); - } - obj->hdr_size = consumed_bytes - obj->idx.offset; - - data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, oid); - obj->idx.crc32 = input_crc32; - return data; -} - -static void *unpack_data(struct object_entry *obj, - int (*consume)(const unsigned char *, unsigned long, void *), - void *cb_data) -{ - off_t from = obj[0].idx.offset + obj[0].hdr_size; - off_t len = obj[1].idx.offset - from; - unsigned char *data, *inbuf; - git_zstream stream; - int status; - - data = xmallocz(consume ? 64*1024 : obj->size); - inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024); - - memset(&stream, 0, sizeof(stream)); - git_inflate_init(&stream); - stream.next_out = data; - stream.avail_out = consume ? 64*1024 : obj->size; - - do { - ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024; - n = xpread(get_thread_data()->pack_fd, inbuf, n, from); - if (n < 0) - die_errno(_("cannot pread pack file")); - if (!n) - die(Q_("premature end of pack file, %"PRIuMAX" byte missing", - "premature end of pack file, %"PRIuMAX" bytes missing", - (unsigned int)len), - (uintmax_t)len); - from += n; - len -= n; - stream.next_in = inbuf; - stream.avail_in = n; - if (!consume) - status = git_inflate(&stream, 0); - else { - do { - status = git_inflate(&stream, 0); - if (consume(data, stream.next_out - data, cb_data)) { - free(inbuf); - free(data); - return NULL; - } - stream.next_out = data; - stream.avail_out = 64*1024; - } while (status == Z_OK && stream.avail_in); - } - } while (len && status == Z_OK && !stream.avail_in); - - /* This has been inflated OK when first encountered, so... */ - if (status != Z_STREAM_END || stream.total_out != obj->size) - die(_("serious inflate inconsistency")); - - git_inflate_end(&stream); - free(inbuf); - if (consume) { - FREE_AND_NULL(data); - } - return data; -} - -static void *get_data_from_pack(struct object_entry *obj) -{ - return unpack_data(obj, NULL, NULL); -} - -static int compare_ofs_delta_bases(off_t offset1, off_t offset2, - enum object_type type1, - enum object_type type2) -{ - int cmp = type1 - type2; - if (cmp) - return cmp; - return offset1 < offset2 ? -1 : - offset1 > offset2 ? 1 : - 0; -} - -static int find_ofs_delta(const off_t offset) -{ - int first = 0, last = nr_ofs_deltas; - - while (first < last) { - int next = first + (last - first) / 2; - struct ofs_delta_entry *delta = &ofs_deltas[next]; - int cmp; - - cmp = compare_ofs_delta_bases(offset, delta->offset, - OBJ_OFS_DELTA, - objects[delta->obj_no].type); - if (!cmp) - return next; - if (cmp < 0) { - last = next; - continue; - } - first = next+1; - } - return -first-1; -} - -static void find_ofs_delta_children(off_t offset, - int *first_index, int *last_index) -{ - int first = find_ofs_delta(offset); - int last = first; - int end = nr_ofs_deltas - 1; - - if (first < 0) { - *first_index = 0; - *last_index = -1; - return; - } - while (first > 0 && ofs_deltas[first - 1].offset == offset) - --first; - while (last < end && ofs_deltas[last + 1].offset == offset) - ++last; - *first_index = first; - *last_index = last; -} - -static int compare_ref_delta_bases(const struct object_id *oid1, - const struct object_id *oid2, - enum object_type type1, - enum object_type type2) -{ - int cmp = type1 - type2; - if (cmp) - return cmp; - return oidcmp(oid1, oid2); -} - -static int find_ref_delta(const struct object_id *oid) -{ - int first = 0, last = nr_ref_deltas; - - while (first < last) { - int next = first + (last - first) / 2; - struct ref_delta_entry *delta = &ref_deltas[next]; - int cmp; - - cmp = compare_ref_delta_bases(oid, &delta->oid, - OBJ_REF_DELTA, - objects[delta->obj_no].type); - if (!cmp) - return next; - if (cmp < 0) { - last = next; - continue; - } - first = next+1; - } - return -first-1; -} - -static void find_ref_delta_children(const struct object_id *oid, - int *first_index, int *last_index) -{ - int first = find_ref_delta(oid); - int last = first; - int end = nr_ref_deltas - 1; - - if (first < 0) { - *first_index = 0; - *last_index = -1; - return; - } - while (first > 0 && oideq(&ref_deltas[first - 1].oid, oid)) - --first; - while (last < end && oideq(&ref_deltas[last + 1].oid, oid)) - ++last; - *first_index = first; - *last_index = last; -} - -struct compare_data { - struct object_entry *entry; - struct git_istream *st; - unsigned char *buf; - unsigned long buf_size; -}; - -static int compare_objects(const unsigned char *buf, unsigned long size, - void *cb_data) -{ - struct compare_data *data = cb_data; - - if (data->buf_size < size) { - free(data->buf); - data->buf = xmalloc(size); - data->buf_size = size; - } - - while (size) { - ssize_t len = read_istream(data->st, data->buf, size); - if (len == 0) - die(_("SHA1 COLLISION FOUND WITH %s !"), - oid_to_hex(&data->entry->idx.oid)); - if (len < 0) - die(_("unable to read %s"), - oid_to_hex(&data->entry->idx.oid)); - if (memcmp(buf, data->buf, len)) - die(_("SHA1 COLLISION FOUND WITH %s !"), - oid_to_hex(&data->entry->idx.oid)); - size -= len; - buf += len; - } - return 0; -} - -static int check_collison(struct object_entry *entry) -{ - struct compare_data data; - enum object_type type; - unsigned long size; - - if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB) - return -1; - - memset(&data, 0, sizeof(data)); - data.entry = entry; - data.st = open_istream(the_repository, &entry->idx.oid, &type, &size, - NULL); - if (!data.st) - return -1; - if (size != entry->size || type != entry->type) - die(_("SHA1 COLLISION FOUND WITH %s !"), - oid_to_hex(&entry->idx.oid)); - unpack_data(entry, compare_objects, &data); - close_istream(data.st); - free(data.buf); - return 0; -} - -static void sha1_object(const void *data, struct object_entry *obj_entry, - unsigned long size, enum object_type type, - const struct object_id *oid) -{ - void *new_data = NULL; - int collision_test_needed = 0; - - assert(data || obj_entry); - - if (startup_info->have_repository) { - read_lock(); - collision_test_needed = - has_object_file_with_flags(oid, OBJECT_INFO_QUICK); - read_unlock(); - } - - if (collision_test_needed && !data) { - read_lock(); - if (!check_collison(obj_entry)) - collision_test_needed = 0; - read_unlock(); - } - if (collision_test_needed) { - void *has_data; - enum object_type has_type; - unsigned long has_size; - read_lock(); - has_type = oid_object_info(the_repository, oid, &has_size); - if (has_type < 0) - die(_("cannot read existing object info %s"), oid_to_hex(oid)); - if (has_type != type || has_size != size) - die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid)); - has_data = read_object_file(oid, &has_type, &has_size); - read_unlock(); - if (!data) - data = new_data = get_data_from_pack(obj_entry); - if (!has_data) - die(_("cannot read existing object %s"), oid_to_hex(oid)); - if (size != has_size || type != has_type || - memcmp(data, has_data, size) != 0) - die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid)); - free(has_data); - } - - if (strict || do_fsck_object) { - read_lock(); - if (type == OBJ_BLOB) { - struct blob *blob = lookup_blob(the_repository, oid); - if (blob) - blob->object.flags |= FLAG_CHECKED; - else - die(_("invalid blob object %s"), oid_to_hex(oid)); - if (do_fsck_object && - fsck_object(&blob->object, (void *)data, size, &fsck_options)) - die(_("fsck error in packed object")); - } else { - struct object *obj; - int eaten; - void *buf = (void *) data; - - assert(data && "data can only be NULL for large _blobs_"); - - /* - * we do not need to free the memory here, as the - * buf is deleted by the caller. - */ - obj = parse_object_buffer(the_repository, oid, type, - size, buf, - &eaten); - if (!obj) - die(_("invalid %s"), type_name(type)); - if (do_fsck_object && - fsck_object(obj, buf, size, &fsck_options)) - die(_("fsck error in packed object")); - if (strict && fsck_walk(obj, NULL, &fsck_options)) - die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid)); - - if (obj->type == OBJ_TREE) { - struct tree *item = (struct tree *) obj; - item->buffer = NULL; - obj->parsed = 0; - } - if (obj->type == OBJ_COMMIT) { - struct commit *commit = (struct commit *) obj; - if (detach_commit_buffer(commit, NULL) != data) - BUG("parse_object_buffer transmogrified our buffer"); - } - obj->flags |= FLAG_CHECKED; - } - read_unlock(); - } - - free(new_data); -} - -/* - * Ensure that this node has been reconstructed and return its contents. - * - * In the typical and best case, this node would already be reconstructed - * (through the invocation to resolve_delta() in threaded_second_pass()) and it - * would not be pruned. However, if pruning of this node was necessary due to - * reaching delta_base_cache_limit, this function will find the closest - * ancestor with reconstructed data that has not been pruned (or if there is - * none, the ultimate base object), and reconstruct each node in the delta - * chain in order to generate the reconstructed data for this node. - */ -static void *get_base_data(struct base_data *c) -{ - if (!c->data) { - struct object_entry *obj = c->obj; - struct base_data **delta = NULL; - int delta_nr = 0, delta_alloc = 0; - - while (is_delta_type(c->obj->type) && !c->data) { - ALLOC_GROW(delta, delta_nr + 1, delta_alloc); - delta[delta_nr++] = c; - c = c->base; - } - if (!delta_nr) { - c->data = get_data_from_pack(obj); - c->size = obj->size; - base_cache_used += c->size; - prune_base_data(c); - } - for (; delta_nr > 0; delta_nr--) { - void *base, *raw; - c = delta[delta_nr - 1]; - obj = c->obj; - base = get_base_data(c->base); - raw = get_data_from_pack(obj); - c->data = patch_delta( - base, c->base->size, - raw, obj->size, - &c->size); - free(raw); - if (!c->data) - bad_object(obj->idx.offset, _("failed to apply delta")); - base_cache_used += c->size; - prune_base_data(c); - } - free(delta); - } - return c->data; -} - -static struct base_data *make_base(struct object_entry *obj, - struct base_data *parent) -{ - struct base_data *base = xcalloc(1, sizeof(struct base_data)); - base->base = parent; - base->obj = obj; - find_ref_delta_children(&obj->idx.oid, - &base->ref_first, &base->ref_last); - find_ofs_delta_children(obj->idx.offset, - &base->ofs_first, &base->ofs_last); - base->children_remaining = base->ref_last - base->ref_first + - base->ofs_last - base->ofs_first + 2; - return base; -} - -static struct base_data *resolve_delta(struct object_entry *delta_obj, - struct base_data *base) -{ - void *delta_data, *result_data; - struct base_data *result; - unsigned long result_size; - - if (show_stat) { - int i = delta_obj - objects; - int j = base->obj - objects; - obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1; - deepest_delta_lock(); - if (deepest_delta < obj_stat[i].delta_depth) - deepest_delta = obj_stat[i].delta_depth; - deepest_delta_unlock(); - obj_stat[i].base_object_no = j; - } - delta_data = get_data_from_pack(delta_obj); - assert(base->data); - result_data = patch_delta(base->data, base->size, - delta_data, delta_obj->size, &result_size); - free(delta_data); - if (!result_data) - bad_object(delta_obj->idx.offset, _("failed to apply delta")); - hash_object_file(the_hash_algo, result_data, result_size, - type_name(delta_obj->real_type), &delta_obj->idx.oid); - sha1_object(result_data, NULL, result_size, delta_obj->real_type, - &delta_obj->idx.oid); - - result = make_base(delta_obj, base); - result->data = result_data; - result->size = result_size; - - counter_lock(); - nr_resolved_deltas++; - counter_unlock(); - - return result; -} - -static int compare_ofs_delta_entry(const void *a, const void *b) -{ - const struct ofs_delta_entry *delta_a = a; - const struct ofs_delta_entry *delta_b = b; - - return delta_a->offset < delta_b->offset ? -1 : - delta_a->offset > delta_b->offset ? 1 : - 0; -} - -static int compare_ref_delta_entry(const void *a, const void *b) -{ - const struct ref_delta_entry *delta_a = a; - const struct ref_delta_entry *delta_b = b; - - return oidcmp(&delta_a->oid, &delta_b->oid); -} - -static void *threaded_second_pass(void *data) -{ - if (data) - set_thread_data(data); - for (;;) { - struct base_data *parent = NULL; - struct object_entry *child_obj; - struct base_data *child; - - counter_lock(); - display_progress(progress, nr_resolved_deltas); - counter_unlock(); - - work_lock(); - if (list_empty(&work_head)) { - /* - * Take an object from the object array. - */ - while (nr_dispatched < nr_objects && - is_delta_type(objects[nr_dispatched].type)) - nr_dispatched++; - if (nr_dispatched >= nr_objects) { - work_unlock(); - break; - } - child_obj = &objects[nr_dispatched++]; - } else { - /* - * Peek at the top of the stack, and take a child from - * it. - */ - parent = list_first_entry(&work_head, struct base_data, - list); - - if (parent->ref_first <= parent->ref_last) { - int offset = ref_deltas[parent->ref_first++].obj_no; - child_obj = objects + offset; - if (child_obj->real_type != OBJ_REF_DELTA) - die("REF_DELTA at offset %"PRIuMAX" already resolved (duplicate base %s?)", - (uintmax_t) child_obj->idx.offset, - oid_to_hex(&parent->obj->idx.oid)); - child_obj->real_type = parent->obj->real_type; - } else { - child_obj = objects + - ofs_deltas[parent->ofs_first++].obj_no; - assert(child_obj->real_type == OBJ_OFS_DELTA); - child_obj->real_type = parent->obj->real_type; - } - - if (parent->ref_first > parent->ref_last && - parent->ofs_first > parent->ofs_last) { - /* - * This parent has run out of children, so move - * it to done_head. - */ - list_del(&parent->list); - list_add(&parent->list, &done_head); - } - - /* - * Ensure that the parent has data, since we will need - * it later. - * - * NEEDSWORK: If parent data needs to be reloaded, this - * prolongs the time that the current thread spends in - * the mutex. A mitigating factor is that parent data - * needs to be reloaded only if the delta base cache - * limit is exceeded, so in the typical case, this does - * not happen. - */ - get_base_data(parent); - parent->retain_data++; - } - work_unlock(); - - if (parent) { - child = resolve_delta(child_obj, parent); - if (!child->children_remaining) - FREE_AND_NULL(child->data); - } else { - child = make_base(child_obj, NULL); - if (child->children_remaining) { - /* - * Since this child has its own delta children, - * we will need this data in the future. - * Inflate now so that future iterations will - * have access to this object's data while - * outside the work mutex. - */ - child->data = get_data_from_pack(child_obj); - child->size = child_obj->size; - } - } - - work_lock(); - if (parent) - parent->retain_data--; - if (child->data) { - /* - * This child has its own children, so add it to - * work_head. - */ - list_add(&child->list, &work_head); - base_cache_used += child->size; - prune_base_data(NULL); - } else { - /* - * This child does not have its own children. It may be - * the last descendant of its ancestors; free those - * that we can. - */ - struct base_data *p = parent; - - while (p) { - struct base_data *next_p; - - p->children_remaining--; - if (p->children_remaining) - break; - - next_p = p->base; - free_base_data(p); - list_del(&p->list); - free(p); - - p = next_p; - } - } - work_unlock(); - } - return NULL; -} - -/* - * First pass: - * - find locations of all objects; - * - calculate SHA1 of all non-delta objects; - * - remember base (SHA1 or offset) for all deltas. - */ -static void parse_pack_objects(unsigned char *hash) -{ - int i, nr_delays = 0; - struct ofs_delta_entry *ofs_delta = ofs_deltas; - struct object_id ref_delta_oid; - struct stat st; - - if (verbose) - progress = start_progress( - from_stdin ? _("Receiving objects") : _("Indexing objects"), - nr_objects); - for (i = 0; i < nr_objects; i++) { - struct object_entry *obj = &objects[i]; - void *data = unpack_raw_entry(obj, &ofs_delta->offset, - &ref_delta_oid, - &obj->idx.oid); - obj->real_type = obj->type; - if (obj->type == OBJ_OFS_DELTA) { - nr_ofs_deltas++; - ofs_delta->obj_no = i; - ofs_delta++; - } else if (obj->type == OBJ_REF_DELTA) { - ALLOC_GROW(ref_deltas, nr_ref_deltas + 1, ref_deltas_alloc); - oidcpy(&ref_deltas[nr_ref_deltas].oid, &ref_delta_oid); - ref_deltas[nr_ref_deltas].obj_no = i; - nr_ref_deltas++; - } else if (!data) { - /* large blobs, check later */ - obj->real_type = OBJ_BAD; - nr_delays++; - } else - sha1_object(data, NULL, obj->size, obj->type, - &obj->idx.oid); - free(data); - display_progress(progress, i+1); - } - objects[i].idx.offset = consumed_bytes; - stop_progress(&progress); - - /* Check pack integrity */ - flush(); - the_hash_algo->final_fn(hash, &input_ctx); - if (!hasheq(fill(the_hash_algo->rawsz), hash)) - die(_("pack is corrupted (SHA1 mismatch)")); - use(the_hash_algo->rawsz); - - /* If input_fd is a file, we should have reached its end now. */ - if (fstat(input_fd, &st)) - die_errno(_("cannot fstat packfile")); - if (S_ISREG(st.st_mode) && - lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size) - die(_("pack has junk at the end")); - - for (i = 0; i < nr_objects; i++) { - struct object_entry *obj = &objects[i]; - if (obj->real_type != OBJ_BAD) - continue; - obj->real_type = obj->type; - sha1_object(NULL, obj, obj->size, obj->type, - &obj->idx.oid); - nr_delays--; - } - if (nr_delays) - die(_("confusion beyond insanity in parse_pack_objects()")); -} - -/* - * Second pass: - * - for all non-delta objects, look if it is used as a base for - * deltas; - * - if used as a base, uncompress the object and apply all deltas, - * recursively checking if the resulting object is used as a base - * for some more deltas. - */ -static void resolve_deltas(void) -{ - int i; - - if (!nr_ofs_deltas && !nr_ref_deltas) - return; - - /* Sort deltas by base SHA1/offset for fast searching */ - QSORT(ofs_deltas, nr_ofs_deltas, compare_ofs_delta_entry); - QSORT(ref_deltas, nr_ref_deltas, compare_ref_delta_entry); - - if (verbose || show_resolving_progress) - progress = start_progress(_("Resolving deltas"), - nr_ref_deltas + nr_ofs_deltas); - - nr_dispatched = 0; - base_cache_limit = delta_base_cache_limit * nr_threads; - if (nr_threads > 1 || getenv("GIT_FORCE_THREADS")) { - init_thread(); - for (i = 0; i < nr_threads; i++) { - int ret = pthread_create(&thread_data[i].thread, NULL, - threaded_second_pass, thread_data + i); - if (ret) - die(_("unable to create thread: %s"), - strerror(ret)); - } - for (i = 0; i < nr_threads; i++) - pthread_join(thread_data[i].thread, NULL); - cleanup_thread(); - return; - } - threaded_second_pass(¬hread_data); -} - -/* - * Third pass: - * - append objects to convert thin pack to full pack if required - * - write the final pack hash - */ -static void fix_unresolved_deltas(struct hashfile *f); -static void conclude_pack(int fix_thin_pack, const char *curr_pack, unsigned char *pack_hash) -{ - if (nr_ref_deltas + nr_ofs_deltas == nr_resolved_deltas) { - stop_progress(&progress); - /* Flush remaining pack final hash. */ - flush(); - return; - } - - if (fix_thin_pack) { - struct hashfile *f; - unsigned char read_hash[GIT_MAX_RAWSZ], tail_hash[GIT_MAX_RAWSZ]; - struct strbuf msg = STRBUF_INIT; - int nr_unresolved = nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas; - int nr_objects_initial = nr_objects; - if (nr_unresolved <= 0) - die(_("confusion beyond insanity")); - REALLOC_ARRAY(objects, nr_objects + nr_unresolved + 1); - memset(objects + nr_objects + 1, 0, - nr_unresolved * sizeof(*objects)); - f = hashfd(output_fd, curr_pack); - fix_unresolved_deltas(f); - strbuf_addf(&msg, Q_("completed with %d local object", - "completed with %d local objects", - nr_objects - nr_objects_initial), - nr_objects - nr_objects_initial); - stop_progress_msg(&progress, msg.buf); - strbuf_release(&msg); - finalize_hashfile(f, tail_hash, 0); - hashcpy(read_hash, pack_hash); - fixup_pack_header_footer(output_fd, pack_hash, - curr_pack, nr_objects, - read_hash, consumed_bytes-the_hash_algo->rawsz); - if (!hasheq(read_hash, tail_hash)) - die(_("Unexpected tail checksum for %s " - "(disk corruption?)"), curr_pack); - } - if (nr_ofs_deltas + nr_ref_deltas != nr_resolved_deltas) - die(Q_("pack has %d unresolved delta", - "pack has %d unresolved deltas", - nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas), - nr_ofs_deltas + nr_ref_deltas - nr_resolved_deltas); -} - -static int write_compressed(struct hashfile *f, void *in, unsigned int size) -{ - git_zstream stream; - int status; - unsigned char outbuf[4096]; - - git_deflate_init(&stream, zlib_compression_level); - stream.next_in = in; - stream.avail_in = size; - - do { - stream.next_out = outbuf; - stream.avail_out = sizeof(outbuf); - status = git_deflate(&stream, Z_FINISH); - hashwrite(f, outbuf, sizeof(outbuf) - stream.avail_out); - } while (status == Z_OK); - - if (status != Z_STREAM_END) - die(_("unable to deflate appended object (%d)"), status); - size = stream.total_out; - git_deflate_end(&stream); - return size; -} - -static struct object_entry *append_obj_to_pack(struct hashfile *f, - const unsigned char *sha1, void *buf, - unsigned long size, enum object_type type) -{ - struct object_entry *obj = &objects[nr_objects++]; - unsigned char header[10]; - unsigned long s = size; - int n = 0; - unsigned char c = (type << 4) | (s & 15); - s >>= 4; - while (s) { - header[n++] = c | 0x80; - c = s & 0x7f; - s >>= 7; - } - header[n++] = c; - crc32_begin(f); - hashwrite(f, header, n); - obj[0].size = size; - obj[0].hdr_size = n; - obj[0].type = type; - obj[0].real_type = type; - obj[1].idx.offset = obj[0].idx.offset + n; - obj[1].idx.offset += write_compressed(f, buf, size); - obj[0].idx.crc32 = crc32_end(f); - hashflush(f); - hashcpy(obj->idx.oid.hash, sha1); - return obj; -} - -static int delta_pos_compare(const void *_a, const void *_b) -{ - struct ref_delta_entry *a = *(struct ref_delta_entry **)_a; - struct ref_delta_entry *b = *(struct ref_delta_entry **)_b; - return a->obj_no - b->obj_no; -} - -static void fix_unresolved_deltas(struct hashfile *f) -{ - struct ref_delta_entry **sorted_by_pos; - int i; - - /* - * Since many unresolved deltas may well be themselves base objects - * for more unresolved deltas, we really want to include the - * smallest number of base objects that would cover as much delta - * as possible by picking the - * trunc deltas first, allowing for other deltas to resolve without - * additional base objects. Since most base objects are to be found - * before deltas depending on them, a good heuristic is to start - * resolving deltas in the same order as their position in the pack. - */ - ALLOC_ARRAY(sorted_by_pos, nr_ref_deltas); - for (i = 0; i < nr_ref_deltas; i++) - sorted_by_pos[i] = &ref_deltas[i]; - QSORT(sorted_by_pos, nr_ref_deltas, delta_pos_compare); - - if (has_promisor_remote()) { - /* - * Prefetch the delta bases. - */ - struct oid_array to_fetch = OID_ARRAY_INIT; - for (i = 0; i < nr_ref_deltas; i++) { - struct ref_delta_entry *d = sorted_by_pos[i]; - if (!oid_object_info_extended(the_repository, &d->oid, - NULL, - OBJECT_INFO_FOR_PREFETCH)) - continue; - oid_array_append(&to_fetch, &d->oid); - } - promisor_remote_get_direct(the_repository, - to_fetch.oid, to_fetch.nr); - oid_array_clear(&to_fetch); - } - - for (i = 0; i < nr_ref_deltas; i++) { - struct ref_delta_entry *d = sorted_by_pos[i]; - enum object_type type; - void *data; - unsigned long size; - - if (objects[d->obj_no].real_type != OBJ_REF_DELTA) - continue; - data = read_object_file(&d->oid, &type, &size); - if (!data) - continue; - - if (check_object_signature(the_repository, &d->oid, - data, size, - type_name(type))) - die(_("local object %s is corrupt"), oid_to_hex(&d->oid)); - - /* - * Add this as an object to the objects array and call - * threaded_second_pass() (which will pick up the added - * object). - */ - append_obj_to_pack(f, d->oid.hash, data, size, type); - threaded_second_pass(NULL); - - display_progress(progress, nr_resolved_deltas); - } - free(sorted_by_pos); -} - -static const char *derive_filename(const char *pack_name, const char *suffix, - struct strbuf *buf) -{ - size_t len; - if (!strip_suffix(pack_name, ".pack", &len)) - die(_("packfile name '%s' does not end with '.pack'"), - pack_name); - strbuf_add(buf, pack_name, len); - strbuf_addch(buf, '.'); - strbuf_addstr(buf, suffix); - return buf->buf; -} - -static void write_special_file(const char *suffix, const char *msg, - const char *pack_name, const unsigned char *hash, - const char **report) -{ - struct strbuf name_buf = STRBUF_INIT; - const char *filename; - int fd; - int msg_len = strlen(msg); - - if (pack_name) - filename = derive_filename(pack_name, suffix, &name_buf); - else - filename = odb_pack_name(&name_buf, hash, suffix); - - fd = odb_pack_keep(filename); - if (fd < 0) { - if (errno != EEXIST) - die_errno(_("cannot write %s file '%s'"), - suffix, filename); - } else { - if (msg_len > 0) { - write_or_die(fd, msg, msg_len); - write_or_die(fd, "\n", 1); - } - if (close(fd) != 0) - die_errno(_("cannot close written %s file '%s'"), - suffix, filename); - if (report) - *report = suffix; - } - strbuf_release(&name_buf); -} - -static void final(const char *final_pack_name, const char *curr_pack_name, - const char *final_index_name, const char *curr_index_name, - const char *keep_msg, const char *promisor_msg, - unsigned char *hash) -{ - const char *report = "pack"; - struct strbuf pack_name = STRBUF_INIT; - struct strbuf index_name = STRBUF_INIT; - int err; - - if (!from_stdin) { - close(input_fd); - } else { - fsync_or_die(output_fd, curr_pack_name); - err = close(output_fd); - if (err) - die_errno(_("error while closing pack file")); - } - - if (keep_msg) - write_special_file("keep", keep_msg, final_pack_name, hash, - &report); - if (promisor_msg) - write_special_file("promisor", promisor_msg, final_pack_name, - hash, NULL); - - if (final_pack_name != curr_pack_name) { - if (!final_pack_name) - final_pack_name = odb_pack_name(&pack_name, hash, "pack"); - if (finalize_object_file(curr_pack_name, final_pack_name)) - die(_("cannot store pack file")); - } else if (from_stdin) - chmod(final_pack_name, 0444); - - if (final_index_name != curr_index_name) { - if (!final_index_name) - final_index_name = odb_pack_name(&index_name, hash, "idx"); - if (finalize_object_file(curr_index_name, final_index_name)) - die(_("cannot store index file")); - } else - chmod(final_index_name, 0444); - - if (do_fsck_object) { - struct packed_git *p; - p = add_packed_git(final_index_name, strlen(final_index_name), 0); - if (p) - install_packed_git(the_repository, p); - } - - if (!from_stdin) { - printf("%s\n", hash_to_hex(hash)); - } else { - struct strbuf buf = STRBUF_INIT; - - strbuf_addf(&buf, "%s\t%s\n", report, hash_to_hex(hash)); - write_or_die(1, buf.buf, buf.len); - strbuf_release(&buf); - - /* - * Let's just mimic git-unpack-objects here and write - * the last part of the input buffer to stdout. - */ - while (input_len) { - err = xwrite(1, input_buffer + input_offset, input_len); - if (err <= 0) - break; - input_len -= err; - input_offset += err; - } - } - - strbuf_release(&index_name); - strbuf_release(&pack_name); -} - -static int git_index_pack_config(const char *k, const char *v, void *cb) -{ - struct pack_idx_option *opts = cb; - - if (!strcmp(k, "pack.indexversion")) { - opts->version = git_config_int(k, v); - if (opts->version > 2) - die(_("bad pack.indexversion=%"PRIu32), opts->version); - return 0; - } - if (!strcmp(k, "pack.threads")) { - nr_threads = git_config_int(k, v); - if (nr_threads < 0) - die(_("invalid number of threads specified (%d)"), - nr_threads); - if (!HAVE_THREADS && nr_threads != 1) { - warning(_("no threads support, ignoring %s"), k); - nr_threads = 1; - } - return 0; - } - return git_default_config(k, v, cb); -} - -static int cmp_uint32(const void *a_, const void *b_) -{ - uint32_t a = *((uint32_t *)a_); - uint32_t b = *((uint32_t *)b_); - - return (a < b) ? -1 : (a != b); -} - -static void read_v2_anomalous_offsets(struct packed_git *p, - struct pack_idx_option *opts) -{ - const uint32_t *idx1, *idx2; - uint32_t i; - - /* The address of the 4-byte offset table */ - idx1 = (((const uint32_t *)((const uint8_t *)p->index_data + p->crc_offset)) - + p->num_objects /* CRC32 table */ - ); - - /* The address of the 8-byte offset table */ - idx2 = idx1 + p->num_objects; - - for (i = 0; i < p->num_objects; i++) { - uint32_t off = ntohl(idx1[i]); - if (!(off & 0x80000000)) - continue; - off = off & 0x7fffffff; - check_pack_index_ptr(p, &idx2[off * 2]); - if (idx2[off * 2]) - continue; - /* - * The real offset is ntohl(idx2[off * 2]) in high 4 - * octets, and ntohl(idx2[off * 2 + 1]) in low 4 - * octets. But idx2[off * 2] is Zero!!! - */ - ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc); - opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]); - } - - QSORT(opts->anomaly, opts->anomaly_nr, cmp_uint32); -} - -static void read_idx_option(struct pack_idx_option *opts, const char *pack_name) -{ - struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1); - - if (!p) - die(_("Cannot open existing pack file '%s'"), pack_name); - if (open_pack_index(p)) - die(_("Cannot open existing pack idx file for '%s'"), pack_name); - - /* Read the attributes from the existing idx file */ - opts->version = p->index_version; - - if (opts->version == 2) - read_v2_anomalous_offsets(p, opts); - - /* - * Get rid of the idx file as we do not need it anymore. - * NEEDSWORK: extract this bit from free_pack_by_name() in - * sha1-file.c, perhaps? It shouldn't matter very much as we - * know we haven't installed this pack (hence we never have - * read anything from it). - */ - close_pack_index(p); - free(p); -} - -static void show_pack_info(int stat_only) -{ - int i, baseobjects = nr_objects - nr_ref_deltas - nr_ofs_deltas; - unsigned long *chain_histogram = NULL; - - if (deepest_delta) - chain_histogram = xcalloc(deepest_delta, sizeof(unsigned long)); - - for (i = 0; i < nr_objects; i++) { - struct object_entry *obj = &objects[i]; - - if (is_delta_type(obj->type)) - chain_histogram[obj_stat[i].delta_depth - 1]++; - if (stat_only) - continue; - printf("%s %-6s %"PRIuMAX" %"PRIuMAX" %"PRIuMAX, - oid_to_hex(&obj->idx.oid), - type_name(obj->real_type), (uintmax_t)obj->size, - (uintmax_t)(obj[1].idx.offset - obj->idx.offset), - (uintmax_t)obj->idx.offset); - if (is_delta_type(obj->type)) { - struct object_entry *bobj = &objects[obj_stat[i].base_object_no]; - printf(" %u %s", obj_stat[i].delta_depth, - oid_to_hex(&bobj->idx.oid)); - } - putchar('\n'); - } - - if (baseobjects) - printf_ln(Q_("non delta: %d object", - "non delta: %d objects", - baseobjects), - baseobjects); - for (i = 0; i < deepest_delta; i++) { - if (!chain_histogram[i]) - continue; - printf_ln(Q_("chain length = %d: %lu object", - "chain length = %d: %lu objects", - chain_histogram[i]), - i + 1, - chain_histogram[i]); - } -} - -int cmd_index_pack(int argc, const char **argv, const char *prefix) -{ - int i, fix_thin_pack = 0, verify = 0, stat_only = 0; - const char *curr_index; - const char *index_name = NULL, *pack_name = NULL; - const char *keep_msg = NULL; - const char *promisor_msg = NULL; - struct strbuf index_name_buf = STRBUF_INIT; - struct pack_idx_entry **idx_objects; - struct pack_idx_option opts; - unsigned char pack_hash[GIT_MAX_RAWSZ]; - unsigned foreign_nr = 1; /* zero is a "good" value, assume bad */ - int report_end_of_input = 0; - int hash_algo = 0; - - /* - * index-pack never needs to fetch missing objects except when - * REF_DELTA bases are missing (which are explicitly handled). It only - * accesses the repo to do hash collision checks and to check which - * REF_DELTA bases need to be fetched. - */ - fetch_if_missing = 0; - - if (argc == 2 && !strcmp(argv[1], "-h")) - usage(index_pack_usage); - - read_replace_refs = 0; - fsck_options.walk = mark_link; - - reset_pack_idx_option(&opts); - git_config(git_index_pack_config, &opts); - if (prefix && chdir(prefix)) - die(_("Cannot come back to cwd")); - - for (i = 1; i < argc; i++) { - const char *arg = argv[i]; - - if (*arg == '-') { - if (!strcmp(arg, "--stdin")) { - from_stdin = 1; - } else if (!strcmp(arg, "--fix-thin")) { - fix_thin_pack = 1; - } else if (skip_to_optional_arg(arg, "--strict", &arg)) { - strict = 1; - do_fsck_object = 1; - fsck_set_msg_types(&fsck_options, arg); - } else if (!strcmp(arg, "--check-self-contained-and-connected")) { - strict = 1; - check_self_contained_and_connected = 1; - } else if (!strcmp(arg, "--fsck-objects")) { - do_fsck_object = 1; - } else if (!strcmp(arg, "--verify")) { - verify = 1; - } else if (!strcmp(arg, "--verify-stat")) { - verify = 1; - show_stat = 1; - } else if (!strcmp(arg, "--verify-stat-only")) { - verify = 1; - show_stat = 1; - stat_only = 1; - } else if (skip_to_optional_arg(arg, "--keep", &keep_msg)) { - ; /* nothing to do */ - } else if (skip_to_optional_arg(arg, "--promisor", &promisor_msg)) { - ; /* already parsed */ - } else if (starts_with(arg, "--threads=")) { - char *end; - nr_threads = strtoul(arg+10, &end, 0); - if (!arg[10] || *end || nr_threads < 0) - usage(index_pack_usage); - if (!HAVE_THREADS && nr_threads != 1) { - warning(_("no threads support, ignoring %s"), arg); - nr_threads = 1; - } - } else if (starts_with(arg, "--pack_header=")) { - struct pack_header *hdr; - char *c; - - hdr = (struct pack_header *)input_buffer; - hdr->hdr_signature = htonl(PACK_SIGNATURE); - hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10)); - if (*c != ',') - die(_("bad %s"), arg); - hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10)); - if (*c) - die(_("bad %s"), arg); - input_len = sizeof(*hdr); - } else if (!strcmp(arg, "-v")) { - verbose = 1; - } else if (!strcmp(arg, "--show-resolving-progress")) { - show_resolving_progress = 1; - } else if (!strcmp(arg, "--report-end-of-input")) { - report_end_of_input = 1; - } else if (!strcmp(arg, "-o")) { - if (index_name || (i+1) >= argc) - usage(index_pack_usage); - index_name = argv[++i]; - } else if (starts_with(arg, "--index-version=")) { - char *c; - opts.version = strtoul(arg + 16, &c, 10); - if (opts.version > 2) - die(_("bad %s"), arg); - if (*c == ',') - opts.off32_limit = strtoul(c+1, &c, 0); - if (*c || opts.off32_limit & 0x80000000) - die(_("bad %s"), arg); - } else if (skip_prefix(arg, "--max-input-size=", &arg)) { - max_input_size = strtoumax(arg, NULL, 10); - } else if (skip_prefix(arg, "--object-format=", &arg)) { - hash_algo = hash_algo_by_name(arg); - if (hash_algo == GIT_HASH_UNKNOWN) - die(_("unknown hash algorithm '%s'"), arg); - repo_set_hash_algo(the_repository, hash_algo); - } else - usage(index_pack_usage); - continue; - } - - if (pack_name) - usage(index_pack_usage); - pack_name = arg; - } - - if (!pack_name && !from_stdin) - usage(index_pack_usage); - if (fix_thin_pack && !from_stdin) - die(_("--fix-thin cannot be used without --stdin")); - if (from_stdin && !startup_info->have_repository) - die(_("--stdin requires a git repository")); - if (from_stdin && hash_algo) - die(_("--object-format cannot be used with --stdin")); - if (!index_name && pack_name) - index_name = derive_filename(pack_name, "idx", &index_name_buf); - - if (verify) { - if (!index_name) - die(_("--verify with no packfile name given")); - read_idx_option(&opts, index_name); - opts.flags |= WRITE_IDX_VERIFY | WRITE_IDX_STRICT; - } - if (strict) - opts.flags |= WRITE_IDX_STRICT; - - if (HAVE_THREADS && !nr_threads) { - nr_threads = online_cpus(); - /* - * Experiments show that going above 20 threads doesn't help, - * no matter how many cores you have. Below that, we tend to - * max at half the number of online_cpus(), presumably because - * half of those are hyperthreads rather than full cores. We'll - * never reduce the level below "3", though, to match a - * historical value that nobody complained about. - */ - if (nr_threads < 4) - ; /* too few cores to consider capping */ - else if (nr_threads < 6) - nr_threads = 3; /* historic cap */ - else if (nr_threads < 40) - nr_threads /= 2; - else - nr_threads = 20; /* hard cap */ - } - - curr_pack = open_pack_file(pack_name); - parse_pack_header(); - objects = xcalloc(st_add(nr_objects, 1), sizeof(struct object_entry)); - if (show_stat) - obj_stat = xcalloc(st_add(nr_objects, 1), sizeof(struct object_stat)); - ofs_deltas = xcalloc(nr_objects, sizeof(struct ofs_delta_entry)); - parse_pack_objects(pack_hash); - if (report_end_of_input) - write_in_full(2, "\0", 1); - resolve_deltas(); - conclude_pack(fix_thin_pack, curr_pack, pack_hash); - free(ofs_deltas); - free(ref_deltas); - if (strict) - foreign_nr = check_objects(); - - if (show_stat) - show_pack_info(stat_only); - - ALLOC_ARRAY(idx_objects, nr_objects); - for (i = 0; i < nr_objects; i++) - idx_objects[i] = &objects[i].idx; - curr_index = write_idx_file(index_name, idx_objects, nr_objects, &opts, pack_hash); - free(idx_objects); - - if (!verify) - final(pack_name, curr_pack, - index_name, curr_index, - keep_msg, promisor_msg, - pack_hash); - else - close(input_fd); - - if (do_fsck_object && fsck_finish(&fsck_options)) - die(_("fsck error in pack objects")); - - free(objects); - strbuf_release(&index_name_buf); - if (pack_name == NULL) - free((void *) curr_pack); - if (index_name == NULL) - free((void *) curr_index); - - /* - * Let the caller know this pack is not self contained - */ - if (check_self_contained_and_connected && foreign_nr) - return 1; - - return 0; -} |