[thirdparty/git.git] / builtin-unpack-objects.c

#include "builtin.h"
#include "cache.h"
#include "object.h"
#include "delta.h"
#include "pack.h"
#include "blob.h"
#include "commit.h"
#include "tag.h"
#include "tree.h"

#include <sys/time.h>

static int dry_run, quiet, recover, has_errors;
static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] < pack-file";

/* We always read in 4kB chunks. */
static unsigned char buffer[4096];
static unsigned long offset, len, consumed_bytes;
static SHA_CTX ctx;

/*
 * 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 <= len)
		return buffer + offset;
	if (min > sizeof(buffer))
		die("cannot fill %d bytes", min);
	if (offset) {
		SHA1_Update(&ctx, buffer, offset);
		memcpy(buffer, buffer + offset, len);
		offset = 0;
	}
	do {
		int ret = xread(0, buffer + len, sizeof(buffer) - len);
		if (ret <= 0) {
			if (!ret)
				die("early EOF");
			die("read error on input: %s", strerror(errno));
		}
		len += ret;
	} while (len < min);
	return buffer;
}

static void use(int bytes)
{
	if (bytes > len)
		die("used more bytes than were available");
	len -= bytes;
	offset += bytes;
	consumed_bytes += bytes;
}

static void *get_data(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 = len;
	inflateInit(&stream);

	for (;;) {
		int ret = inflate(&stream, 0);
		use(len - stream.avail_in);
		if (stream.total_out == size && ret == Z_STREAM_END)
			break;
		if (ret != Z_OK) {
			error("inflate returned %d\n", ret);
			free(buf);
			buf = NULL;
			if (!recover)
				exit(1);
			has_errors = 1;
			break;
		}
		stream.next_in = fill(1);
		stream.avail_in = len;
	}
	inflateEnd(&stream);
	return buf;
}

struct delta_info {
	unsigned char base_sha1[20];
	unsigned long base_offset;
	unsigned long size;
	void *delta;
	unsigned nr;
	struct delta_info *next;
};

static struct delta_info *delta_list;

static void add_delta_to_list(unsigned nr, unsigned const char *base_sha1,
			      unsigned long base_offset,
			      void *delta, unsigned long size)
{
	struct delta_info *info = xmalloc(sizeof(*info));

	hashcpy(info->base_sha1, base_sha1);
	info->base_offset = base_offset;
	info->size = size;
	info->delta = delta;
	info->nr = nr;
	info->next = delta_list;
	delta_list = info;
}

struct obj_info {
	unsigned long offset;
	unsigned char sha1[20];
};

static struct obj_info *obj_list;

static void added_object(unsigned nr, const char *type, void *data,
			 unsigned long size);

static void write_object(unsigned nr, void *buf, unsigned long size,
			 const char *type)
{
	if (write_sha1_file(buf, size, type, obj_list[nr].sha1) < 0)
		die("failed to write object");
	added_object(nr, type, buf, size);
}

static void resolve_delta(unsigned nr, const char *type,
			  void *base, unsigned long base_size,
			  void *delta, unsigned long delta_size)
{
	void *result;
	unsigned long result_size;

	result = patch_delta(base, base_size,
			     delta, delta_size,
			     &result_size);
	if (!result)
		die("failed to apply delta");
	free(delta);
	write_object(nr, result, result_size, type);
	free(result);
}

static void added_object(unsigned nr, const char *type, void *data,
			 unsigned long size)
{
	struct delta_info **p = &delta_list;
	struct delta_info *info;

	while ((info = *p) != NULL) {
		if (!hashcmp(info->base_sha1, obj_list[nr].sha1) ||
		    info->base_offset == obj_list[nr].offset) {
			*p = info->next;
			p = &delta_list;
			resolve_delta(info->nr, type, data, size,
				      info->delta, info->size);
			free(info);
			continue;
		}
		p = &info->next;
	}
}

static void unpack_non_delta_entry(enum object_type kind, unsigned long size,
				   unsigned nr)
{
	void *buf = get_data(size);
	const char *type;

	switch (kind) {
	case OBJ_COMMIT: type = commit_type; break;
	case OBJ_TREE:   type = tree_type; break;
	case OBJ_BLOB:   type = blob_type; break;
	case OBJ_TAG:    type = tag_type; break;
	default: die("bad type %d", kind);
	}
	if (!dry_run && buf)
		write_object(nr, buf, size, type);
	free(buf);
}

static void unpack_delta_entry(enum object_type kind, unsigned long delta_size,
			       unsigned nr)
{
	void *delta_data, *base;
	unsigned long base_size;
	char type[20];
	unsigned char base_sha1[20];

	if (kind == OBJ_REF_DELTA) {
		hashcpy(base_sha1, fill(20));
		use(20);
		delta_data = get_data(delta_size);
		if (dry_run || !delta_data) {
			free(delta_data);
			return;
		}
		if (!has_sha1_file(base_sha1)) {
			hashcpy(obj_list[nr].sha1, null_sha1);
			add_delta_to_list(nr, base_sha1, 0, delta_data, delta_size);
			return;
		}
	} else {
		unsigned base_found = 0;
		unsigned char *pack, c;
		unsigned long base_offset;
		unsigned lo, mid, hi;

		pack = fill(1);
		c = *pack;
		use(1);
		base_offset = c & 127;
		while (c & 128) {
			base_offset += 1;
			if (!base_offset || base_offset & ~(~0UL >> 7))
				die("offset value overflow for delta base object");
			pack = fill(1);
			c = *pack;
			use(1);
			base_offset = (base_offset << 7) + (c & 127);
		}
		base_offset = obj_list[nr].offset - base_offset;

		delta_data = get_data(delta_size);
		if (dry_run || !delta_data) {
			free(delta_data);
			return;
		}
		lo = 0;
		hi = nr;
		while (lo < hi) {
			mid = (lo + hi)/2;
			if (base_offset < obj_list[mid].offset) {
				hi = mid;
			} else if (base_offset > obj_list[mid].offset) {
				lo = mid + 1;
			} else {
				hashcpy(base_sha1, obj_list[mid].sha1);
				base_found = !is_null_sha1(base_sha1);
				break;
			}
		}
		if (!base_found) {
			/* The delta base object is itself a delta that
			   has not been	resolved yet. */
			hashcpy(obj_list[nr].sha1, null_sha1);
			add_delta_to_list(nr, null_sha1, base_offset, delta_data, delta_size);
			return;
		}
	}

	base = read_sha1_file(base_sha1, type, &base_size);
	if (!base) {
		error("failed to read delta-pack base object %s",
		      sha1_to_hex(base_sha1));
		if (!recover)
			exit(1);
		has_errors = 1;
		return;
	}
	resolve_delta(nr, type, base, base_size, delta_data, delta_size);
	free(base);
}

static void unpack_one(unsigned nr, unsigned total)
{
	unsigned shift;
	unsigned char *pack, c;
	unsigned long size;
	enum object_type type;

	obj_list[nr].offset = consumed_bytes;

	pack = fill(1);
	c = *pack;
	use(1);
	type = (c >> 4) & 7;
	size = (c & 15);
	shift = 4;
	while (c & 0x80) {
		pack = fill(1);
		c = *pack;
		use(1);
		size += (c & 0x7f) << shift;
		shift += 7;
	}
	if (!quiet) {
		static unsigned long last_sec;
		static unsigned last_percent;
		struct timeval now;
		unsigned percentage = ((nr+1) * 100) / total;

		gettimeofday(&now, NULL);
		if (percentage != last_percent || now.tv_sec != last_sec) {
			last_sec = now.tv_sec;
			last_percent = percentage;
			fprintf(stderr, "%4u%% (%u/%u) done\r",
					percentage, (nr+1), total);
		}
	}
	switch (type) {
	case OBJ_COMMIT:
	case OBJ_TREE:
	case OBJ_BLOB:
	case OBJ_TAG:
		unpack_non_delta_entry(type, size, nr);
		return;
	case OBJ_REF_DELTA:
	case OBJ_OFS_DELTA:
		unpack_delta_entry(type, size, nr);
		return;
	default:
		error("bad object type %d", type);
		has_errors = 1;
		if (recover)
			return;
		exit(1);
	}
}

static void unpack_all(void)
{
	int i;
	struct pack_header *hdr = fill(sizeof(struct pack_header));
	unsigned nr_objects = ntohl(hdr->hdr_entries);

	if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
		die("bad pack file");
	if (!pack_version_ok(hdr->hdr_version))
		die("unknown pack file version %d", ntohl(hdr->hdr_version));
	fprintf(stderr, "Unpacking %d objects\n", nr_objects);

	obj_list = xmalloc(nr_objects * sizeof(*obj_list));
	use(sizeof(struct pack_header));
	for (i = 0; i < nr_objects; i++)
		unpack_one(i, nr_objects);
	if (delta_list)
		die("unresolved deltas left after unpacking");
}

int cmd_unpack_objects(int argc, const char **argv, const char *prefix)
{
	int i;
	unsigned char sha1[20];

	git_config(git_default_config);

	quiet = !isatty(2);

	for (i = 1 ; i < argc; i++) {
		const char *arg = argv[i];

		if (*arg == '-') {
			if (!strcmp(arg, "-n")) {
				dry_run = 1;
				continue;
			}
			if (!strcmp(arg, "-q")) {
				quiet = 1;
				continue;
			}
			if (!strcmp(arg, "-r")) {
				recover = 1;
				continue;
			}
			usage(unpack_usage);
		}

		/* We don't take any non-flag arguments now.. Maybe some day */
		usage(unpack_usage);
	}
	SHA1_Init(&ctx);
	unpack_all();
	SHA1_Update(&ctx, buffer, offset);
	SHA1_Final(sha1, &ctx);
	if (hashcmp(fill(20), sha1))
		die("final sha1 did not match");
	use(20);

	/* Write the last part of the buffer to stdout */
	while (len) {
		int ret = xwrite(1, buffer + offset, len);
		if (ret <= 0)
			break;
		len -= ret;
		offset += ret;
	}

	/* All done */
	if (!quiet)
		fprintf(stderr, "\n");
	return has_errors;
}
Commit	Line	Data
64413630	1	#include "builtin.h"
bad50dc8	2	#include "cache.h"
74536958	3	#include "object.h"
8ee378a0	4	#include "delta.h"
a733cb60	5	#include "pack.h"
8e440259 PE	6	#include "blob.h"
	7	#include "commit.h"
	8	#include "tag.h"
	9	#include "tree.h"
bad50dc8	10
d36f7b80 LT	11	#include <sys/time.h>
d36f7b80 LT	12
3b67d291 JH	13	static int dry_run, quiet, recover, has_errors;
3b67d291 JH	14	static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] < pack-file";
bad50dc8	15
67e5a5ec LT	16	/* We always read in 4kB chunks. */
67e5a5ec LT	17	static unsigned char buffer[4096];
209c554a	18	static unsigned long offset, len, consumed_bytes;
67e5a5ec	19	static SHA_CTX ctx;
bad50dc8	20
67e5a5ec LT	21	/*
	22	* Make sure at least "min" bytes are available in the buffer, and
	23	* return the pointer to the buffer.
	24	*/
	25	static void * fill(int min)
	26	{
	27	if (min <= len)
	28	return buffer + offset;
67e5a5ec LT	29	if (min > sizeof(buffer))
	30	die("cannot fill %d bytes", min);
	31	if (offset) {
	32	SHA1_Update(&ctx, buffer, offset);
	33	memcpy(buffer, buffer + offset, len);
	34	offset = 0;
	35	}
	36	do {
1c15afb9	37	int ret = xread(0, buffer + len, sizeof(buffer) - len);
67e5a5ec LT	38	if (ret <= 0) {
	39	if (!ret)
	40	die("early EOF");
67e5a5ec LT	41	die("read error on input: %s", strerror(errno));
	42	}
	43	len += ret;
	44	} while (len < min);
	45	return buffer;
	46	}
74536958	47
67e5a5ec LT	48	static void use(int bytes)
	49	{
	50	if (bytes > len)
	51	die("used more bytes than were available");
	52	len -= bytes;
	53	offset += bytes;
209c554a	54	consumed_bytes += bytes;
67e5a5ec	55	}
bad50dc8	56
67e5a5ec	57	static void *get_data(unsigned long size)
bad50dc8	58	{
67e5a5ec LT	59	z_stream stream;
	60	void *buf = xmalloc(size);
	61
67e5a5ec LT	62	memset(&stream, 0, sizeof(stream));
	63
	64	stream.next_out = buf;
	65	stream.avail_out = size;
	66	stream.next_in = fill(1);
	67	stream.avail_in = len;
	68	inflateInit(&stream);
	69
	70	for (;;) {
	71	int ret = inflate(&stream, 0);
	72	use(len - stream.avail_in);
	73	if (stream.total_out == size && ret == Z_STREAM_END)
	74	break;
f986f2c8 JH	75	if (ret != Z_OK) {
	76	error("inflate returned %d\n", ret);
	77	free(buf);
	78	buf = NULL;
3b67d291	79	if (!recover)
f986f2c8 JH	80	exit(1);
	81	has_errors = 1;
	82	break;
	83	}
67e5a5ec LT	84	stream.next_in = fill(1);
	85	stream.avail_in = len;
	86	}
ee639140	87	inflateEnd(&stream);
67e5a5ec	88	return buf;
bad50dc8 LT	89	}
bad50dc8 LT	90
67e5a5ec LT	91	struct delta_info {
67e5a5ec LT	92	unsigned char base_sha1[20];
209c554a	93	unsigned long base_offset;
67e5a5ec LT	94	unsigned long size;
67e5a5ec LT	95	void *delta;
209c554a	96	unsigned nr;
67e5a5ec LT	97	struct delta_info *next;
	98	};
	99
	100	static struct delta_info *delta_list;
	101
209c554a NP	102	static void add_delta_to_list(unsigned nr, unsigned const char *base_sha1,
	103	unsigned long base_offset,
	104	void *delta, unsigned long size)
bad50dc8	105	{
67e5a5ec	106	struct delta_info info = xmalloc(sizeof(info));
bad50dc8	107
e702496e	108	hashcpy(info->base_sha1, base_sha1);
209c554a	109	info->base_offset = base_offset;
67e5a5ec LT	110	info->size = size;
67e5a5ec LT	111	info->delta = delta;
209c554a	112	info->nr = nr;
67e5a5ec LT	113	info->next = delta_list;
67e5a5ec LT	114	delta_list = info;
bad50dc8 LT	115	}
bad50dc8 LT	116
209c554a NP	117	struct obj_info {
	118	unsigned long offset;
	119	unsigned char sha1[20];
	120	};
	121
	122	static struct obj_info *obj_list;
67e5a5ec	123
209c554a NP	124	static void added_object(unsigned nr, const char type, void data,
	125	unsigned long size);
	126
	127	static void write_object(unsigned nr, void *buf, unsigned long size,
	128	const char *type)
cca7081a	129	{
209c554a	130	if (write_sha1_file(buf, size, type, obj_list[nr].sha1) < 0)
cca7081a	131	die("failed to write object");
209c554a	132	added_object(nr, type, buf, size);
cca7081a LT	133	}
cca7081a LT	134
209c554a	135	static void resolve_delta(unsigned nr, const char *type,
f986f2c8 JH	136	void *base, unsigned long base_size,
f986f2c8 JH	137	void *delta, unsigned long delta_size)
bad50dc8	138	{
67e5a5ec LT	139	void *result;
67e5a5ec LT	140	unsigned long result_size;
bad50dc8	141
67e5a5ec LT	142	result = patch_delta(base, base_size,
	143	delta, delta_size,
	144	&result_size);
	145	if (!result)
	146	die("failed to apply delta");
	147	free(delta);
209c554a	148	write_object(nr, result, result_size, type);
67e5a5ec	149	free(result);
bad50dc8 LT	150	}
bad50dc8 LT	151
209c554a NP	152	static void added_object(unsigned nr, const char type, void data,
209c554a NP	153	unsigned long size)
74536958	154	{
67e5a5ec LT	155	struct delta_info **p = &delta_list;
	156	struct delta_info *info;
	157
	158	while ((info = *p) != NULL) {
209c554a NP	159	if (!hashcmp(info->base_sha1, obj_list[nr].sha1) \|\|
209c554a NP	160	info->base_offset == obj_list[nr].offset) {
67e5a5ec LT	161	*p = info->next;
67e5a5ec LT	162	p = &delta_list;
209c554a NP	163	resolve_delta(info->nr, type, data, size,
209c554a NP	164	info->delta, info->size);
67e5a5ec LT	165	free(info);
	166	continue;
	167	}
	168	p = &info->next;
	169	}
	170	}
	171
209c554a NP	172	static void unpack_non_delta_entry(enum object_type kind, unsigned long size,
209c554a NP	173	unsigned nr)
67e5a5ec LT	174	{
67e5a5ec LT	175	void *buf = get_data(size);
cca7081a	176	const char *type;
8ee378a0	177
8ee378a0	178	switch (kind) {
8e440259 PE	179	case OBJ_COMMIT: type = commit_type; break;
	180	case OBJ_TREE: type = tree_type; break;
	181	case OBJ_BLOB: type = blob_type; break;
	182	case OBJ_TAG: type = tag_type; break;
67e5a5ec	183	default: die("bad type %d", kind);
8ee378a0	184	}
f986f2c8	185	if (!dry_run && buf)
209c554a	186	write_object(nr, buf, size, type);
67e5a5ec	187	free(buf);
8ee378a0 JH	188	}
8ee378a0 JH	189
209c554a NP	190	static void unpack_delta_entry(enum object_type kind, unsigned long delta_size,
209c554a NP	191	unsigned nr)
8ee378a0	192	{
67e5a5ec LT	193	void delta_data, base;
67e5a5ec LT	194	unsigned long base_size;
8ee378a0	195	char type[20];
67e5a5ec	196	unsigned char base_sha1[20];
8ee378a0	197
209c554a NP	198	if (kind == OBJ_REF_DELTA) {
	199	hashcpy(base_sha1, fill(20));
	200	use(20);
	201	delta_data = get_data(delta_size);
	202	if (dry_run \|\| !delta_data) {
	203	free(delta_data);
	204	return;
	205	}
	206	if (!has_sha1_file(base_sha1)) {
	207	hashcpy(obj_list[nr].sha1, null_sha1);
	208	add_delta_to_list(nr, base_sha1, 0, delta_data, delta_size);
	209	return;
	210	}
	211	} else {
	212	unsigned base_found = 0;
	213	unsigned char *pack, c;
	214	unsigned long base_offset;
	215	unsigned lo, mid, hi;
c4fb06c0	216
209c554a NP	217	pack = fill(1);
	218	c = *pack;
	219	use(1);
	220	base_offset = c & 127;
	221	while (c & 128) {
	222	base_offset += 1;
	223	if (!base_offset \|\| base_offset & ~(~0UL >> 7))
	224	die("offset value overflow for delta base object");
	225	pack = fill(1);
	226	c = *pack;
	227	use(1);
	228	base_offset = (base_offset << 7) + (c & 127);
	229	}
	230	base_offset = obj_list[nr].offset - base_offset;
8ee378a0	231
209c554a NP	232	delta_data = get_data(delta_size);
	233	if (dry_run \|\| !delta_data) {
	234	free(delta_data);
	235	return;
	236	}
	237	lo = 0;
	238	hi = nr;
	239	while (lo < hi) {
	240	mid = (lo + hi)/2;
	241	if (base_offset < obj_list[mid].offset) {
	242	hi = mid;
	243	} else if (base_offset > obj_list[mid].offset) {
	244	lo = mid + 1;
	245	} else {
	246	hashcpy(base_sha1, obj_list[mid].sha1);
	247	base_found = !is_null_sha1(base_sha1);
	248	break;
	249	}
	250	}
	251	if (!base_found) {
	252	/* The delta base object is itself a delta that
	253	has not been resolved yet. */
	254	hashcpy(obj_list[nr].sha1, null_sha1);
	255	add_delta_to_list(nr, null_sha1, base_offset, delta_data, delta_size);
	256	return;
	257	}
8ee378a0	258	}
209c554a	259
c4fb06c0	260	base = read_sha1_file(base_sha1, type, &base_size);
f986f2c8 JH	261	if (!base) {
	262	error("failed to read delta-pack base object %s",
	263	sha1_to_hex(base_sha1));
3b67d291	264	if (!recover)
f986f2c8 JH	265	exit(1);
	266	has_errors = 1;
	267	return;
	268	}
209c554a	269	resolve_delta(nr, type, base, base_size, delta_data, delta_size);
ee639140	270	free(base);
8ee378a0 JH	271	}
8ee378a0 JH	272
d36f7b80	273	static void unpack_one(unsigned nr, unsigned total)
8ee378a0	274	{
01247d87	275	unsigned shift;
a733cb60	276	unsigned char *pack, c;
67e5a5ec LT	277	unsigned long size;
67e5a5ec LT	278	enum object_type type;
74536958	279
209c554a NP	280	obj_list[nr].offset = consumed_bytes;
209c554a NP	281
67e5a5ec LT	282	pack = fill(1);
	283	c = *pack;
	284	use(1);
a733cb60 LT	285	type = (c >> 4) & 7;
a733cb60 LT	286	size = (c & 15);
01247d87	287	shift = 4;
a733cb60	288	while (c & 0x80) {
67e5a5ec	289	pack = fill(1);
209c554a	290	c = *pack;
67e5a5ec	291	use(1);
01247d87 LT	292	size += (c & 0x7f) << shift;
01247d87 LT	293	shift += 7;
a733cb60	294	}
d36f7b80 LT	295	if (!quiet) {
	296	static unsigned long last_sec;
	297	static unsigned last_percent;
	298	struct timeval now;
209c554a	299	unsigned percentage = ((nr+1) * 100) / total;
d36f7b80 LT	300
	301	gettimeofday(&now, NULL);
	302	if (percentage != last_percent \|\| now.tv_sec != last_sec) {
	303	last_sec = now.tv_sec;
	304	last_percent = percentage;
209c554a NP	305	fprintf(stderr, "%4u%% (%u/%u) done\r",
209c554a NP	306	percentage, (nr+1), total);
d36f7b80 LT	307	}
d36f7b80 LT	308	}
a733cb60 LT	309	switch (type) {
	310	case OBJ_COMMIT:
	311	case OBJ_TREE:
	312	case OBJ_BLOB:
	313	case OBJ_TAG:
209c554a	314	unpack_non_delta_entry(type, size, nr);
a733cb60	315	return;
eb32d236	316	case OBJ_REF_DELTA:
209c554a NP	317	case OBJ_OFS_DELTA:
209c554a NP	318	unpack_delta_entry(type, size, nr);
a733cb60	319	return;
67e5a5ec	320	default:
f986f2c8 JH	321	error("bad object type %d", type);
f986f2c8 JH	322	has_errors = 1;
3b67d291	323	if (recover)
f986f2c8 JH	324	return;
f986f2c8 JH	325	exit(1);
74536958 LT	326	}
	327	}
	328
74536958 LT	329	static void unpack_all(void)
74536958 LT	330	{
67e5a5ec LT	331	int i;
67e5a5ec LT	332	struct pack_header *hdr = fill(sizeof(struct pack_header));
67e5a5ec LT	333	unsigned nr_objects = ntohl(hdr->hdr_entries);
	334
	335	if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
	336	die("bad pack file");
d60fc1c8 NP	337	if (!pack_version_ok(hdr->hdr_version))
d60fc1c8 NP	338	die("unknown pack file version %d", ntohl(hdr->hdr_version));
67e5a5ec LT	339	fprintf(stderr, "Unpacking %d objects\n", nr_objects);
67e5a5ec LT	340
209c554a	341	obj_list = xmalloc(nr_objects * sizeof(*obj_list));
67e5a5ec LT	342	use(sizeof(struct pack_header));
67e5a5ec LT	343	for (i = 0; i < nr_objects; i++)
209c554a	344	unpack_one(i, nr_objects);
67e5a5ec LT	345	if (delta_list)
67e5a5ec LT	346	die("unresolved deltas left after unpacking");
74536958 LT	347	}
74536958 LT	348
64413630	349	int cmd_unpack_objects(int argc, const char *argv, const char prefix)
bad50dc8 LT	350	{
bad50dc8 LT	351	int i;
67e5a5ec	352	unsigned char sha1[20];
bad50dc8	353
8e273641	354	git_config(git_default_config);
53228a5f	355
476e8011 JH	356	quiet = !isatty(2);
476e8011 JH	357
bad50dc8 LT	358	for (i = 1 ; i < argc; i++) {
	359	const char *arg = argv[i];
	360
	361	if (*arg == '-') {
74536958 LT	362	if (!strcmp(arg, "-n")) {
	363	dry_run = 1;
	364	continue;
	365	}
d36f7b80 LT	366	if (!strcmp(arg, "-q")) {
	367	quiet = 1;
	368	continue;
	369	}
f986f2c8	370	if (!strcmp(arg, "-r")) {
3b67d291	371	recover = 1;
f986f2c8 JH	372	continue;
f986f2c8 JH	373	}
bad50dc8 LT	374	usage(unpack_usage);
bad50dc8 LT	375	}
67e5a5ec LT	376
67e5a5ec LT	377	/* We don't take any non-flag arguments now.. Maybe some day */
bad50dc8	378	usage(unpack_usage);
67e5a5ec LT	379	}
67e5a5ec LT	380	SHA1_Init(&ctx);
74536958	381	unpack_all();
67e5a5ec LT	382	SHA1_Update(&ctx, buffer, offset);
67e5a5ec LT	383	SHA1_Final(sha1, &ctx);
a89fccd2	384	if (hashcmp(fill(20), sha1))
67e5a5ec LT	385	die("final sha1 did not match");
	386	use(20);
	387
	388	/* Write the last part of the buffer to stdout */
	389	while (len) {
1c15afb9 JH	390	int ret = xwrite(1, buffer + offset, len);
1c15afb9 JH	391	if (ret <= 0)
67e5a5ec	392	break;
67e5a5ec LT	393	len -= ret;
	394	offset += ret;
	395	}
	396
	397	/* All done */
d36f7b80 LT	398	if (!quiet)
d36f7b80 LT	399	fprintf(stderr, "\n");
f986f2c8	400	return has_errors;
bad50dc8	401	}