10 #include "tree-walk.h"
15 static int dry_run, quiet, recover, has_errors, strict;
16 static const char unpack_usage[] = "git unpack-objects [-n] [-q] [-r] [--strict]";
18 /* We always read in 4kB chunks. */
19 static unsigned char buffer[4096];
20 static unsigned int offset, len;
21 static off_t consumed_bytes;
22 static off_t max_input_size;
23 static git_SHA_CTX ctx;
24 static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
27 * When running under --strict mode, objects whose reachability are
28 * suspect are kept in core without getting written in the object
36 static struct decoration obj_decorate;
38 static struct obj_buffer *lookup_object_buffer(struct object *base)
40 return lookup_decoration(&obj_decorate, base);
43 static void add_object_buffer(struct object *object, char *buffer, unsigned long size)
45 struct obj_buffer *obj;
46 obj = xcalloc(1, sizeof(struct obj_buffer));
49 if (add_decoration(&obj_decorate, object, obj))
50 die("object %s tried to add buffer twice!", oid_to_hex(&object->oid));
54 * Make sure at least "min" bytes are available in the buffer, and
55 * return the pointer to the buffer.
57 static void *fill(int min)
60 return buffer + offset;
61 if (min > sizeof(buffer))
62 die("cannot fill %d bytes", min);
64 git_SHA1_Update(&ctx, buffer, offset);
65 memmove(buffer, buffer + offset, len);
69 ssize_t ret = xread(0, buffer + len, sizeof(buffer) - len);
73 die_errno("read error on input");
80 static void use(int bytes)
83 die("used more bytes than were available");
87 /* make sure off_t is sufficiently large not to wrap */
88 if (signed_add_overflows(consumed_bytes, bytes))
89 die("pack too large for current definition of off_t");
90 consumed_bytes += bytes;
91 if (max_input_size && consumed_bytes > max_input_size)
92 die(_("pack exceeds maximum allowed size"));
95 static void *get_data(unsigned long size)
98 void *buf = xmallocz(size);
100 memset(&stream, 0, sizeof(stream));
102 stream.next_out = buf;
103 stream.avail_out = size;
104 stream.next_in = fill(1);
105 stream.avail_in = len;
106 git_inflate_init(&stream);
109 int ret = git_inflate(&stream, 0);
110 use(len - stream.avail_in);
111 if (stream.total_out == size && ret == Z_STREAM_END)
114 error("inflate returned %d", ret);
122 stream.next_in = fill(1);
123 stream.avail_in = len;
125 git_inflate_end(&stream);
130 struct object_id base_oid;
135 struct delta_info *next;
138 static struct delta_info *delta_list;
140 static void add_delta_to_list(unsigned nr, const struct object_id *base_oid,
142 void *delta, unsigned long size)
144 struct delta_info *info = xmalloc(sizeof(*info));
146 oidcpy(&info->base_oid, base_oid);
147 info->base_offset = base_offset;
151 info->next = delta_list;
157 struct object_id oid;
161 #define FLAG_OPEN (1u<<20)
162 #define FLAG_WRITTEN (1u<<21)
164 static struct obj_info *obj_list;
165 static unsigned nr_objects;
168 * Called only from check_object() after it verified this object
171 static void write_cached_object(struct object *obj, struct obj_buffer *obj_buf)
173 struct object_id oid;
175 if (write_sha1_file(obj_buf->buffer, obj_buf->size, typename(obj->type), oid.hash) < 0)
176 die("failed to write object %s", oid_to_hex(&obj->oid));
177 obj->flags |= FLAG_WRITTEN;
181 * At the very end of the processing, write_rest() scans the objects
182 * that have reachability requirements and calls this function.
183 * Verify its reachability and validity recursively and write it out.
185 static int check_object(struct object *obj, int type, void *data, struct fsck_options *options)
187 struct obj_buffer *obj_buf;
192 if (obj->flags & FLAG_WRITTEN)
195 if (type != OBJ_ANY && obj->type != type)
196 die("object type mismatch");
198 if (!(obj->flags & FLAG_OPEN)) {
200 int type = sha1_object_info(obj->oid.hash, &size);
201 if (type != obj->type || type <= 0)
202 die("object of unexpected type");
203 obj->flags |= FLAG_WRITTEN;
207 obj_buf = lookup_object_buffer(obj);
209 die("Whoops! Cannot find object '%s'", oid_to_hex(&obj->oid));
210 if (fsck_object(obj, obj_buf->buffer, obj_buf->size, &fsck_options))
211 die("Error in object");
212 fsck_options.walk = check_object;
213 if (fsck_walk(obj, NULL, &fsck_options))
214 die("Error on reachable objects of %s", oid_to_hex(&obj->oid));
215 write_cached_object(obj, obj_buf);
219 static void write_rest(void)
222 for (i = 0; i < nr_objects; i++) {
224 check_object(obj_list[i].obj, OBJ_ANY, NULL, NULL);
228 static void added_object(unsigned nr, enum object_type type,
229 void *data, unsigned long size);
232 * Write out nr-th object from the list, now we know the contents
233 * of it. Under --strict, this buffers structured objects in-core,
234 * to be checked at the end.
236 static void write_object(unsigned nr, enum object_type type,
237 void *buf, unsigned long size)
240 if (write_sha1_file(buf, size, typename(type), obj_list[nr].oid.hash) < 0)
241 die("failed to write object");
242 added_object(nr, type, buf, size);
244 obj_list[nr].obj = NULL;
245 } else if (type == OBJ_BLOB) {
247 if (write_sha1_file(buf, size, typename(type), obj_list[nr].oid.hash) < 0)
248 die("failed to write object");
249 added_object(nr, type, buf, size);
252 blob = lookup_blob(&obj_list[nr].oid);
254 blob->object.flags |= FLAG_WRITTEN;
256 die("invalid blob object");
257 obj_list[nr].obj = NULL;
261 hash_sha1_file(buf, size, typename(type), obj_list[nr].oid.hash);
262 added_object(nr, type, buf, size);
263 obj = parse_object_buffer(&obj_list[nr].oid, type, size, buf,
266 die("invalid %s", typename(type));
267 add_object_buffer(obj, buf, size);
268 obj->flags |= FLAG_OPEN;
269 obj_list[nr].obj = obj;
273 static void resolve_delta(unsigned nr, enum object_type type,
274 void *base, unsigned long base_size,
275 void *delta, unsigned long delta_size)
278 unsigned long result_size;
280 result = patch_delta(base, base_size,
284 die("failed to apply delta");
286 write_object(nr, type, result, result_size);
290 * We now know the contents of an object (which is nr-th in the pack);
291 * resolve all the deltified objects that are based on it.
293 static void added_object(unsigned nr, enum object_type type,
294 void *data, unsigned long size)
296 struct delta_info **p = &delta_list;
297 struct delta_info *info;
299 while ((info = *p) != NULL) {
300 if (!oidcmp(&info->base_oid, &obj_list[nr].oid) ||
301 info->base_offset == obj_list[nr].offset) {
304 resolve_delta(info->nr, type, data, size,
305 info->delta, info->size);
313 static void unpack_non_delta_entry(enum object_type type, unsigned long size,
316 void *buf = get_data(size);
319 write_object(nr, type, buf, size);
324 static int resolve_against_held(unsigned nr, const struct object_id *base,
325 void *delta_data, unsigned long delta_size)
328 struct obj_buffer *obj_buffer;
329 obj = lookup_object(base->hash);
332 obj_buffer = lookup_object_buffer(obj);
335 resolve_delta(nr, obj->type, obj_buffer->buffer,
336 obj_buffer->size, delta_data, delta_size);
340 static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
343 void *delta_data, *base;
344 unsigned long base_size;
345 struct object_id base_oid;
347 if (type == OBJ_REF_DELTA) {
348 hashcpy(base_oid.hash, fill(GIT_SHA1_RAWSZ));
350 delta_data = get_data(delta_size);
351 if (dry_run || !delta_data) {
355 if (has_object_file(&base_oid))
356 ; /* Ok we have this one */
357 else if (resolve_against_held(nr, &base_oid,
358 delta_data, delta_size))
359 return; /* we are done */
361 /* cannot resolve yet --- queue it */
362 oidclr(&obj_list[nr].oid);
363 add_delta_to_list(nr, &base_oid, 0, delta_data, delta_size);
367 unsigned base_found = 0;
368 unsigned char *pack, c;
370 unsigned lo, mid, hi;
375 base_offset = c & 127;
378 if (!base_offset || MSB(base_offset, 7))
379 die("offset value overflow for delta base object");
383 base_offset = (base_offset << 7) + (c & 127);
385 base_offset = obj_list[nr].offset - base_offset;
386 if (base_offset <= 0 || base_offset >= obj_list[nr].offset)
387 die("offset value out of bound for delta base object");
389 delta_data = get_data(delta_size);
390 if (dry_run || !delta_data) {
398 if (base_offset < obj_list[mid].offset) {
400 } else if (base_offset > obj_list[mid].offset) {
403 oidcpy(&base_oid, &obj_list[mid].oid);
404 base_found = !is_null_oid(&base_oid);
410 * The delta base object is itself a delta that
411 * has not been resolved yet.
413 oidclr(&obj_list[nr].oid);
414 add_delta_to_list(nr, &null_oid, base_offset, delta_data, delta_size);
419 if (resolve_against_held(nr, &base_oid, delta_data, delta_size))
422 base = read_sha1_file(base_oid.hash, &type, &base_size);
424 error("failed to read delta-pack base object %s",
425 oid_to_hex(&base_oid));
431 resolve_delta(nr, type, base, base_size, delta_data, delta_size);
435 static void unpack_one(unsigned nr)
439 unsigned long size, c;
440 enum object_type type;
442 obj_list[nr].offset = consumed_bytes;
454 size += (c & 0x7f) << shift;
463 unpack_non_delta_entry(type, size, nr);
467 unpack_delta_entry(type, size, nr);
470 error("bad object type %d", type);
478 static void unpack_all(void)
481 struct progress *progress = NULL;
482 struct pack_header *hdr = fill(sizeof(struct pack_header));
484 nr_objects = ntohl(hdr->hdr_entries);
486 if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
487 die("bad pack file");
488 if (!pack_version_ok(hdr->hdr_version))
489 die("unknown pack file version %"PRIu32,
490 ntohl(hdr->hdr_version));
491 use(sizeof(struct pack_header));
494 progress = start_progress(_("Unpacking objects"), nr_objects);
495 obj_list = xcalloc(nr_objects, sizeof(*obj_list));
496 for (i = 0; i < nr_objects; i++) {
498 display_progress(progress, i + 1);
500 stop_progress(&progress);
503 die("unresolved deltas left after unpacking");
506 int cmd_unpack_objects(int argc, const char **argv, const char *prefix)
509 struct object_id oid;
511 check_replace_refs = 0;
513 git_config(git_default_config, NULL);
517 for (i = 1 ; i < argc; i++) {
518 const char *arg = argv[i];
521 if (!strcmp(arg, "-n")) {
525 if (!strcmp(arg, "-q")) {
529 if (!strcmp(arg, "-r")) {
533 if (!strcmp(arg, "--strict")) {
537 if (skip_prefix(arg, "--strict=", &arg)) {
539 fsck_set_msg_types(&fsck_options, arg);
542 if (starts_with(arg, "--pack_header=")) {
543 struct pack_header *hdr;
546 hdr = (struct pack_header *)buffer;
547 hdr->hdr_signature = htonl(PACK_SIGNATURE);
548 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
551 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
557 if (skip_prefix(arg, "--max-input-size=", &arg)) {
558 max_input_size = strtoumax(arg, NULL, 10);
564 /* We don't take any non-flag arguments now.. Maybe some day */
569 git_SHA1_Update(&ctx, buffer, offset);
570 git_SHA1_Final(oid.hash, &ctx);
573 if (hashcmp(fill(GIT_SHA1_RAWSZ), oid.hash))
574 die("final sha1 did not match");
577 /* Write the last part of the buffer to stdout */
579 int ret = xwrite(1, buffer + offset, len);