diff options
Diffstat (limited to 'index-pack.c')
| -rw-r--r-- | index-pack.c | 1045 |
1 files changed, 1045 insertions, 0 deletions
diff --git a/index-pack.c b/index-pack.c new file mode 100644 index 0000000000..6e93ee6af6 --- /dev/null +++ b/index-pack.c @@ -0,0 +1,1045 @@ +#include "cache.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" + +static const char index_pack_usage[] = +"git index-pack [-v] [-o <index-file>] [{ ---keep | --keep=<msg> }] [--strict] { <pack-file> | --stdin [--fix-thin] [<pack-file>] }"; + +struct object_entry +{ + struct pack_idx_entry idx; + unsigned long size; + unsigned int hdr_size; + enum object_type type; + enum object_type real_type; +}; + +union delta_base { + unsigned char sha1[20]; + off_t offset; +}; + +struct base_data { + struct base_data *base; + struct base_data *child; + struct object_entry *obj; + void *data; + unsigned long size; +}; + +/* + * Even if sizeof(union delta_base) == 24 on 64-bit archs, we really want + * to memcmp() only the first 20 bytes. + */ +#define UNION_BASE_SZ 20 + +#define FLAG_LINK (1u<<20) +#define FLAG_CHECKED (1u<<21) + +struct delta_entry +{ + union delta_base base; + int obj_no; +}; + +static struct object_entry *objects; +static struct delta_entry *deltas; +static struct base_data *base_cache; +static size_t base_cache_used; +static int nr_objects; +static int nr_deltas; +static int nr_resolved_deltas; + +static int from_stdin; +static int strict; +static int verbose; + +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 git_SHA_CTX input_ctx; +static uint32_t input_crc32; +static int input_fd, output_fd, pack_fd; + +static int mark_link(struct object *obj, int type, void *data) +{ + if (!obj) + return -1; + + if (type != OBJ_ANY && obj->type != type) + die("object type mismatch at %s", sha1_to_hex(obj->sha1)); + + 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 void check_object(struct object *obj) +{ + if (!obj) + return; + + if (!(obj->flags & FLAG_LINK)) + return; + + if (!(obj->flags & FLAG_CHECKED)) { + unsigned long size; + int type = sha1_object_info(obj->sha1, &size); + if (type != obj->type || type <= 0) + die("object of unexpected type"); + obj->flags |= FLAG_CHECKED; + return; + } +} + +static void check_objects(void) +{ + unsigned i, max; + + max = get_max_object_index(); + for (i = 0; i < max; i++) + check_object(get_indexed_object(i)); +} + + +/* 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); + git_SHA1_Update(&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("cannot fill %d bytes", 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("read error on input: %s", strerror(errno)); + } + 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 (consumed_bytes > consumed_bytes + bytes) + die("pack too large for current definition of off_t"); + consumed_bytes += bytes; +} + +static char *open_pack_file(char *pack_name) +{ + if (from_stdin) { + input_fd = 0; + if (!pack_name) { + static char tmpfile[PATH_MAX]; + output_fd = odb_mkstemp(tmpfile, sizeof(tmpfile), + "pack/tmp_pack_XXXXXX"); + pack_name = xstrdup(tmpfile); + } else + output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600); + if (output_fd < 0) + die("unable to create %s: %s", pack_name, strerror(errno)); + pack_fd = output_fd; + } else { + input_fd = open(pack_name, O_RDONLY); + if (input_fd < 0) + die("cannot open packfile '%s': %s", + pack_name, strerror(errno)); + output_fd = -1; + pack_fd = input_fd; + } + git_SHA1_Init(&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 void bad_object(unsigned long offset, const char *format, + ...) NORETURN __attribute__((format (printf, 2, 3))); + +static void bad_object(unsigned long 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 %lu: %s", offset, buf); +} + +static void free_base_data(struct base_data *c) +{ + if (c->data) { + free(c->data); + c->data = NULL; + base_cache_used -= c->size; + } +} + +static void prune_base_data(struct base_data *retain) +{ + struct base_data *b; + for (b = base_cache; + base_cache_used > delta_base_cache_limit && b; + b = b->child) { + if (b->data && b != retain) + free_base_data(b); + } +} + +static void link_base_data(struct base_data *base, struct base_data *c) +{ + if (base) + base->child = c; + else + base_cache = c; + + c->base = base; + c->child = NULL; + if (c->data) + base_cache_used += c->size; + prune_base_data(c); +} + +static void unlink_base_data(struct base_data *c) +{ + struct base_data *base = c->base; + if (base) + base->child = NULL; + else + base_cache = NULL; + free_base_data(c); +} + +static void *unpack_entry_data(unsigned long offset, unsigned long size) +{ + z_stream stream; + void *buf = xmalloc(size); + + memset(&stream, 0, sizeof(stream)); + stream.next_out = buf; + stream.avail_out = size; + stream.next_in = fill(1); + stream.avail_in = input_len; + git_inflate_init(&stream); + + for (;;) { + int ret = git_inflate(&stream, 0); + use(input_len - stream.avail_in); + if (stream.total_out == size && ret == Z_STREAM_END) + break; + if (ret != Z_OK) + bad_object(offset, "inflate returned %d", ret); + stream.next_in = fill(1); + stream.avail_in = input_len; + } + git_inflate_end(&stream); + return buf; +} + +static void *unpack_raw_entry(struct object_entry *obj, union delta_base *delta_base) +{ + unsigned char *p, c; + unsigned long size; + off_t base_offset; + unsigned shift; + void *data; + + obj->idx.offset = consumed_bytes; + input_crc32 = crc32(0, Z_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 & 0x7fUL) << shift; + shift += 7; + } + obj->size = size; + + switch (obj->type) { + case OBJ_REF_DELTA: + hashcpy(delta_base->sha1, fill(20)); + use(20); + break; + case OBJ_OFS_DELTA: + memset(delta_base, 0, sizeof(*delta_base)); + 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); + } + delta_base->offset = obj->idx.offset - base_offset; + if (delta_base->offset <= 0 || delta_base->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->idx.crc32 = input_crc32; + return data; +} + +static void *get_data_from_pack(struct object_entry *obj) +{ + off_t from = obj[0].idx.offset + obj[0].hdr_size; + unsigned long len = obj[1].idx.offset - from; + unsigned long rdy = 0; + unsigned char *src, *data; + z_stream stream; + int st; + + src = xmalloc(len); + data = src; + do { + ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy); + if (n < 0) + die("cannot pread pack file: %s", strerror(errno)); + if (!n) + die("premature end of pack file, %lu bytes missing", + len - rdy); + rdy += n; + } while (rdy < len); + data = xmalloc(obj->size); + memset(&stream, 0, sizeof(stream)); + stream.next_out = data; + stream.avail_out = obj->size; + stream.next_in = src; + stream.avail_in = len; + git_inflate_init(&stream); + while ((st = git_inflate(&stream, Z_FINISH)) == Z_OK); + git_inflate_end(&stream); + if (st != Z_STREAM_END || stream.total_out != obj->size) + die("serious inflate inconsistency"); + free(src); + return data; +} + +static int find_delta(const union delta_base *base) +{ + int first = 0, last = nr_deltas; + + while (first < last) { + int next = (first + last) / 2; + struct delta_entry *delta = &deltas[next]; + int cmp; + + cmp = memcmp(base, &delta->base, UNION_BASE_SZ); + if (!cmp) + return next; + if (cmp < 0) { + last = next; + continue; + } + first = next+1; + } + return -first-1; +} + +static void find_delta_children(const union delta_base *base, + int *first_index, int *last_index) +{ + int first = find_delta(base); + int last = first; + int end = nr_deltas - 1; + + if (first < 0) { + *first_index = 0; + *last_index = -1; + return; + } + while (first > 0 && !memcmp(&deltas[first - 1].base, base, UNION_BASE_SZ)) + --first; + while (last < end && !memcmp(&deltas[last + 1].base, base, UNION_BASE_SZ)) + ++last; + *first_index = first; + *last_index = last; +} + +static void sha1_object(const void *data, unsigned long size, + enum object_type type, unsigned char *sha1) +{ + hash_sha1_file(data, size, typename(type), sha1); + if (has_sha1_file(sha1)) { + void *has_data; + enum object_type has_type; + unsigned long has_size; + has_data = read_sha1_file(sha1, &has_type, &has_size); + if (!has_data) + die("cannot read existing object %s", sha1_to_hex(sha1)); + if (size != has_size || type != has_type || + memcmp(data, has_data, size) != 0) + die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1)); + free(has_data); + } + if (strict) { + if (type == OBJ_BLOB) { + struct blob *blob = lookup_blob(sha1); + if (blob) + blob->object.flags |= FLAG_CHECKED; + else + die("invalid blob object %s", sha1_to_hex(sha1)); + } else { + struct object *obj; + int eaten; + void *buf = (void *) data; + + /* + * we do not need to free the memory here, as the + * buf is deleted by the caller. + */ + obj = parse_object_buffer(sha1, type, size, buf, &eaten); + if (!obj) + die("invalid %s", typename(type)); + if (fsck_object(obj, 1, fsck_error_function)) + die("Error in object"); + if (fsck_walk(obj, mark_link, 0)) + die("Not all child objects of %s are reachable", sha1_to_hex(obj->sha1)); + + if (obj->type == OBJ_TREE) { + struct tree *item = (struct tree *) obj; + item->buffer = NULL; + } + if (obj->type == OBJ_COMMIT) { + struct commit *commit = (struct commit *) obj; + commit->buffer = NULL; + } + obj->flags |= FLAG_CHECKED; + } + } +} + +static void *get_base_data(struct base_data *c) +{ + if (!c->data) { + struct object_entry *obj = c->obj; + + if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) { + void *base = get_base_data(c->base); + void *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"); + } else { + c->data = get_data_from_pack(obj); + c->size = obj->size; + } + + base_cache_used += c->size; + prune_base_data(c); + } + return c->data; +} + +static void resolve_delta(struct object_entry *delta_obj, + struct base_data *base, struct base_data *result) +{ + void *base_data, *delta_data; + + delta_obj->real_type = base->obj->real_type; + delta_data = get_data_from_pack(delta_obj); + base_data = get_base_data(base); + result->obj = delta_obj; + 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"); + sha1_object(result->data, result->size, delta_obj->real_type, + delta_obj->idx.sha1); + nr_resolved_deltas++; +} + +static void find_unresolved_deltas(struct base_data *base, + struct base_data *prev_base) +{ + int i, ref_first, ref_last, ofs_first, ofs_last; + + /* + * This is a recursive function. Those brackets should help reducing + * stack usage by limiting the scope of the delta_base union. + */ + { + union delta_base base_spec; + + hashcpy(base_spec.sha1, base->obj->idx.sha1); + find_delta_children(&base_spec, &ref_first, &ref_last); + + memset(&base_spec, 0, sizeof(base_spec)); + base_spec.offset = base->obj->idx.offset; + find_delta_children(&base_spec, &ofs_first, &ofs_last); + } + + if (ref_last == -1 && ofs_last == -1) { + free(base->data); + return; + } + + link_base_data(prev_base, base); + + for (i = ref_first; i <= ref_last; i++) { + struct object_entry *child = objects + deltas[i].obj_no; + if (child->real_type == OBJ_REF_DELTA) { + struct base_data result; + resolve_delta(child, base, &result); + if (i == ref_last && ofs_last == -1) + free_base_data(base); + find_unresolved_deltas(&result, base); + } + } + + for (i = ofs_first; i <= ofs_last; i++) { + struct object_entry *child = objects + deltas[i].obj_no; + if (child->real_type == OBJ_OFS_DELTA) { + struct base_data result; + resolve_delta(child, base, &result); + if (i == ofs_last) + free_base_data(base); + find_unresolved_deltas(&result, base); + } + } + + unlink_base_data(base); +} + +static int compare_delta_entry(const void *a, const void *b) +{ + const struct delta_entry *delta_a = a; + const struct delta_entry *delta_b = b; + return memcmp(&delta_a->base, &delta_b->base, UNION_BASE_SZ); +} + +/* Parse all objects and return the pack content SHA1 hash */ +static void parse_pack_objects(unsigned char *sha1) +{ + int i; + struct delta_entry *delta = deltas; + struct stat st; + + /* + * First pass: + * - find locations of all objects; + * - calculate SHA1 of all non-delta objects; + * - remember base (SHA1 or offset) for all deltas. + */ + 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, &delta->base); + obj->real_type = obj->type; + if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) { + nr_deltas++; + delta->obj_no = i; + delta++; + } else + sha1_object(data, obj->size, obj->type, obj->idx.sha1); + free(data); + display_progress(progress, i+1); + } + objects[i].idx.offset = consumed_bytes; + stop_progress(&progress); + + /* Check pack integrity */ + flush(); + git_SHA1_Final(sha1, &input_ctx); + if (hashcmp(fill(20), sha1)) + die("pack is corrupted (SHA1 mismatch)"); + use(20); + + /* If input_fd is a file, we should have reached its end now. */ + if (fstat(input_fd, &st)) + die("cannot fstat packfile: %s", strerror(errno)); + if (S_ISREG(st.st_mode) && + lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size) + die("pack has junk at the end"); + + if (!nr_deltas) + return; + + /* Sort deltas by base SHA1/offset for fast searching */ + qsort(deltas, nr_deltas, sizeof(struct delta_entry), + compare_delta_entry); + + /* + * 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. + */ + if (verbose) + progress = start_progress("Resolving deltas", nr_deltas); + for (i = 0; i < nr_objects; i++) { + struct object_entry *obj = &objects[i]; + struct base_data base_obj; + + if (obj->type == OBJ_REF_DELTA || obj->type == OBJ_OFS_DELTA) + continue; + base_obj.obj = obj; + base_obj.data = NULL; + find_unresolved_deltas(&base_obj, NULL); + display_progress(progress, nr_resolved_deltas); + } +} + +static int write_compressed(struct sha1file *f, void *in, unsigned int size) +{ + z_stream stream; + unsigned long maxsize; + void *out; + + memset(&stream, 0, sizeof(stream)); + deflateInit(&stream, zlib_compression_level); + maxsize = deflateBound(&stream, size); + out = xmalloc(maxsize); + + /* Compress it */ + stream.next_in = in; + stream.avail_in = size; + stream.next_out = out; + stream.avail_out = maxsize; + while (deflate(&stream, Z_FINISH) == Z_OK); + deflateEnd(&stream); + + size = stream.total_out; + sha1write(f, out, size); + free(out); + return size; +} + +static struct object_entry *append_obj_to_pack(struct sha1file *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); + sha1write(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); + sha1flush(f); + hashcpy(obj->idx.sha1, sha1); + return obj; +} + +static int delta_pos_compare(const void *_a, const void *_b) +{ + struct delta_entry *a = *(struct delta_entry **)_a; + struct delta_entry *b = *(struct delta_entry **)_b; + return a->obj_no - b->obj_no; +} + +static void fix_unresolved_deltas(struct sha1file *f, int nr_unresolved) +{ + struct delta_entry **sorted_by_pos; + int i, n = 0; + + /* + * 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. + */ + sorted_by_pos = xmalloc(nr_unresolved * sizeof(*sorted_by_pos)); + for (i = 0; i < nr_deltas; i++) { + if (objects[deltas[i].obj_no].real_type != OBJ_REF_DELTA) + continue; + sorted_by_pos[n++] = &deltas[i]; + } + qsort(sorted_by_pos, n, sizeof(*sorted_by_pos), delta_pos_compare); + + for (i = 0; i < n; i++) { + struct delta_entry *d = sorted_by_pos[i]; + enum object_type type; + struct base_data base_obj; + + if (objects[d->obj_no].real_type != OBJ_REF_DELTA) + continue; + base_obj.data = read_sha1_file(d->base.sha1, &type, &base_obj.size); + if (!base_obj.data) + continue; + + if (check_sha1_signature(d->base.sha1, base_obj.data, + base_obj.size, typename(type))) + die("local object %s is corrupt", sha1_to_hex(d->base.sha1)); + base_obj.obj = append_obj_to_pack(f, d->base.sha1, + base_obj.data, base_obj.size, type); + find_unresolved_deltas(&base_obj, NULL); + display_progress(progress, nr_resolved_deltas); + } + free(sorted_by_pos); +} + +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_name, const char *keep_msg, + unsigned char *sha1) +{ + const char *report = "pack"; + char name[PATH_MAX]; + int err; + + if (!from_stdin) { + close(input_fd); + } else { + fsync_or_die(output_fd, curr_pack_name); + err = close(output_fd); + if (err) + die("error while closing pack file: %s", strerror(errno)); + } + + if (keep_msg) { + int keep_fd, keep_msg_len = strlen(keep_msg); + + if (!keep_name) + keep_fd = odb_pack_keep(name, sizeof(name), sha1); + else + keep_fd = open(keep_name, O_RDWR|O_CREAT|O_EXCL, 0600); + + if (keep_fd < 0) { + if (errno != EEXIST) + die("cannot write keep file '%s' (%s)", + keep_name, strerror(errno)); + } else { + if (keep_msg_len > 0) { + write_or_die(keep_fd, keep_msg, keep_msg_len); + write_or_die(keep_fd, "\n", 1); + } + if (close(keep_fd) != 0) + die("cannot close written keep file '%s' (%s)", + keep_name, strerror(errno)); + report = "keep"; + } + } + + if (final_pack_name != curr_pack_name) { + if (!final_pack_name) { + snprintf(name, sizeof(name), "%s/pack/pack-%s.pack", + get_object_directory(), sha1_to_hex(sha1)); + final_pack_name = name; + } + if (move_temp_to_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) { + snprintf(name, sizeof(name), "%s/pack/pack-%s.idx", + get_object_directory(), sha1_to_hex(sha1)); + final_index_name = name; + } + if (move_temp_to_file(curr_index_name, final_index_name)) + die("cannot store index file"); + } else + chmod(final_index_name, 0444); + + if (!from_stdin) { + printf("%s\n", sha1_to_hex(sha1)); + } else { + char buf[48]; + int len = snprintf(buf, sizeof(buf), "%s\t%s\n", + report, sha1_to_hex(sha1)); + write_or_die(1, buf, len); + + /* + * 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; + } + } +} + +static int git_index_pack_config(const char *k, const char *v, void *cb) +{ + if (!strcmp(k, "pack.indexversion")) { + pack_idx_default_version = git_config_int(k, v); + if (pack_idx_default_version > 2) + die("bad pack.indexversion=%"PRIu32, + pack_idx_default_version); + return 0; + } + return git_default_config(k, v, cb); +} + +int main(int argc, char **argv) +{ + int i, fix_thin_pack = 0; + char *curr_pack, *pack_name = NULL; + char *curr_index, *index_name = NULL; + const char *keep_name = NULL, *keep_msg = NULL; + char *index_name_buf = NULL, *keep_name_buf = NULL; + struct pack_idx_entry **idx_objects; + unsigned char pack_sha1[20]; + + git_extract_argv0_path(argv[0]); + + /* + * We wish to read the repository's config file if any, and + * for that it is necessary to call setup_git_directory_gently(). + * However if the cwd was inside .git/objects/pack/ then we need + * to go back there or all the pack name arguments will be wrong. + * And in that case we cannot rely on any prefix returned by + * setup_git_directory_gently() either. + */ + { + char cwd[PATH_MAX+1]; + int nongit; + + if (!getcwd(cwd, sizeof(cwd)-1)) + die("Unable to get current working directory"); + setup_git_directory_gently(&nongit); + git_config(git_index_pack_config, NULL); + if (chdir(cwd)) + die("Cannot come back to cwd"); + } + + for (i = 1; i < argc; i++) { + 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 (!strcmp(arg, "--strict")) { + strict = 1; + } else if (!strcmp(arg, "--keep")) { + keep_msg = ""; + } else if (!prefixcmp(arg, "--keep=")) { + keep_msg = arg + 7; + } else if (!prefixcmp(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, "-o")) { + if (index_name || (i+1) >= argc) + usage(index_pack_usage); + index_name = argv[++i]; + } else if (!prefixcmp(arg, "--index-version=")) { + char *c; + pack_idx_default_version = strtoul(arg + 16, &c, 10); + if (pack_idx_default_version > 2) + die("bad %s", arg); + if (*c == ',') + pack_idx_off32_limit = strtoul(c+1, &c, 0); + if (*c || pack_idx_off32_limit & 0x80000000) + die("bad %s", arg); + } 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 (!index_name && pack_name) { + int len = strlen(pack_name); + if (!has_extension(pack_name, ".pack")) + die("packfile name '%s' does not end with '.pack'", + pack_name); + index_name_buf = xmalloc(len); + memcpy(index_name_buf, pack_name, len - 5); + strcpy(index_name_buf + len - 5, ".idx"); + index_name = index_name_buf; + } + if (keep_msg && !keep_name && pack_name) { + int len = strlen(pack_name); + if (!has_extension(pack_name, ".pack")) + die("packfile name '%s' does not end with '.pack'", + pack_name); + keep_name_buf = xmalloc(len); + memcpy(keep_name_buf, pack_name, len - 5); + strcpy(keep_name_buf + len - 5, ".keep"); + keep_name = keep_name_buf; + } + + curr_pack = open_pack_file(pack_name); + parse_pack_header(); + objects = xmalloc((nr_objects + 1) * sizeof(struct object_entry)); + deltas = xmalloc(nr_objects * sizeof(struct delta_entry)); + parse_pack_objects(pack_sha1); + if (nr_deltas == nr_resolved_deltas) { + stop_progress(&progress); + /* Flush remaining pack final 20-byte SHA1. */ + flush(); + } else { + if (fix_thin_pack) { + struct sha1file *f; + unsigned char read_sha1[20], tail_sha1[20]; + char msg[48]; + int nr_unresolved = nr_deltas - nr_resolved_deltas; + int nr_objects_initial = nr_objects; + if (nr_unresolved <= 0) + die("confusion beyond insanity"); + objects = xrealloc(objects, + (nr_objects + nr_unresolved + 1) + * sizeof(*objects)); + f = sha1fd(output_fd, curr_pack); + fix_unresolved_deltas(f, nr_unresolved); + sprintf(msg, "completed with %d local objects", + nr_objects - nr_objects_initial); + stop_progress_msg(&progress, msg); + sha1close(f, tail_sha1, 0); + hashcpy(read_sha1, pack_sha1); + fixup_pack_header_footer(output_fd, pack_sha1, + curr_pack, nr_objects, + read_sha1, consumed_bytes-20); + if (hashcmp(read_sha1, tail_sha1) != 0) + die("Unexpected tail checksum for %s " + "(disk corruption?)", curr_pack); + } + if (nr_deltas != nr_resolved_deltas) + die("pack has %d unresolved deltas", + nr_deltas - nr_resolved_deltas); + } + free(deltas); + if (strict) + check_objects(); + + idx_objects = xmalloc((nr_objects) * sizeof(struct pack_idx_entry *)); + for (i = 0; i < nr_objects; i++) + idx_objects[i] = &objects[i].idx; + curr_index = write_idx_file(index_name, idx_objects, nr_objects, pack_sha1); + free(idx_objects); + + final(pack_name, curr_pack, + index_name, curr_index, + keep_name, keep_msg, + pack_sha1); + free(objects); + free(index_name_buf); + free(keep_name_buf); + if (pack_name == NULL) + free(curr_pack); + if (index_name == NULL) + free(curr_index); + + return 0; +} |