[thirdparty/git.git] / archive-tar.c

/*
 * Copyright (c) 2005, 2006 Rene Scharfe
 */
#include "cache.h"
#include "tar.h"
#include "archive.h"
#include "run-command.h"

#define RECORDSIZE	(512)
#define BLOCKSIZE	(RECORDSIZE * 20)

static char block[BLOCKSIZE];
static unsigned long offset;

static int tar_umask = 002;

static int write_tar_filter_archive(const struct archiver *ar,
				    struct archiver_args *args);

/* writes out the whole block, but only if it is full */
static void write_if_needed(void)
{
	if (offset == BLOCKSIZE) {
		write_or_die(1, block, BLOCKSIZE);
		offset = 0;
	}
}

/*
 * queues up writes, so that all our write(2) calls write exactly one
 * full block; pads writes to RECORDSIZE
 */
static void write_blocked(const void *data, unsigned long size)
{
	const char *buf = data;
	unsigned long tail;

	if (offset) {
		unsigned long chunk = BLOCKSIZE - offset;
		if (size < chunk)
			chunk = size;
		memcpy(block + offset, buf, chunk);
		size -= chunk;
		offset += chunk;
		buf += chunk;
		write_if_needed();
	}
	while (size >= BLOCKSIZE) {
		write_or_die(1, buf, BLOCKSIZE);
		size -= BLOCKSIZE;
		buf += BLOCKSIZE;
	}
	if (size) {
		memcpy(block + offset, buf, size);
		offset += size;
	}
	tail = offset % RECORDSIZE;
	if (tail)  {
		memset(block + offset, 0, RECORDSIZE - tail);
		offset += RECORDSIZE - tail;
	}
	write_if_needed();
}

/*
 * The end of tar archives is marked by 2*512 nul bytes and after that
 * follows the rest of the block (if any).
 */
static void write_trailer(void)
{
	int tail = BLOCKSIZE - offset;
	memset(block + offset, 0, tail);
	write_or_die(1, block, BLOCKSIZE);
	if (tail < 2 * RECORDSIZE) {
		memset(block, 0, offset);
		write_or_die(1, block, BLOCKSIZE);
	}
}

/*
 * pax extended header records have the format "%u %s=%s\n".  %u contains
 * the size of the whole string (including the %u), the first %s is the
 * keyword, the second one is the value.  This function constructs such a
 * string and appends it to a struct strbuf.
 */
static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword,
                                     const char *value, unsigned int valuelen)
{
	int len, tmp;

	/* "%u %s=%s\n" */
	len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1;
	for (tmp = len; tmp > 9; tmp /= 10)
		len++;

	strbuf_grow(sb, len);
	strbuf_addf(sb, "%u %s=", len, keyword);
	strbuf_add(sb, value, valuelen);
	strbuf_addch(sb, '\n');
}

static unsigned int ustar_header_chksum(const struct ustar_header *header)
{
	char *p = (char *)header;
	unsigned int chksum = 0;
	while (p < header->chksum)
		chksum += *p++;
	chksum += sizeof(header->chksum) * ' ';
	p += sizeof(header->chksum);
	while (p < (char *)header + sizeof(struct ustar_header))
		chksum += *p++;
	return chksum;
}

static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen)
{
	size_t i = pathlen;
	if (i > maxlen)
		i = maxlen;
	do {
		i--;
	} while (i > 0 && path[i] != '/');
	return i;
}

static void prepare_header(struct archiver_args *args,
			   struct ustar_header *header,
			   unsigned int mode, unsigned long size)
{
	sprintf(header->mode, "%07o", mode & 07777);
	sprintf(header->size, "%011lo", S_ISREG(mode) ? size : 0);
	sprintf(header->mtime, "%011lo", (unsigned long) args->time);

	sprintf(header->uid, "%07o", 0);
	sprintf(header->gid, "%07o", 0);
	strlcpy(header->uname, "root", sizeof(header->uname));
	strlcpy(header->gname, "root", sizeof(header->gname));
	sprintf(header->devmajor, "%07o", 0);
	sprintf(header->devminor, "%07o", 0);

	memcpy(header->magic, "ustar", 6);
	memcpy(header->version, "00", 2);

	sprintf(header->chksum, "%07o", ustar_header_chksum(header));
}

static int write_extended_header(struct archiver_args *args,
				 const unsigned char *sha1,
				 const void *buffer, unsigned long size)
{
	struct ustar_header header;
	unsigned int mode;
	memset(&header, 0, sizeof(header));
	*header.typeflag = TYPEFLAG_EXT_HEADER;
	mode = 0100666;
	sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
	prepare_header(args, &header, mode, size);
	write_blocked(&header, sizeof(header));
	write_blocked(buffer, size);
	return 0;
}

static int write_tar_entry(struct archiver_args *args,
		const unsigned char *sha1, const char *path, size_t pathlen,
		unsigned int mode, void *buffer, unsigned long size)
{
	struct ustar_header header;
	struct strbuf ext_header = STRBUF_INIT;
	int err = 0;

	memset(&header, 0, sizeof(header));

	if (!sha1) {
		die("BUG: sha1 == NULL is not supported");
	} else if (!path) {
		die("BUG: path == NULL is not supported");
	} else {
		if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
			*header.typeflag = TYPEFLAG_DIR;
			mode = (mode | 0777) & ~tar_umask;
		} else if (S_ISLNK(mode)) {
			*header.typeflag = TYPEFLAG_LNK;
			mode |= 0777;
		} else if (S_ISREG(mode)) {
			*header.typeflag = TYPEFLAG_REG;
			mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
		} else {
			return error("unsupported file mode: 0%o (SHA1: %s)",
					mode, sha1_to_hex(sha1));
		}
		if (pathlen > sizeof(header.name)) {
			size_t plen = get_path_prefix(path, pathlen,
					sizeof(header.prefix));
			size_t rest = pathlen - plen - 1;
			if (plen > 0 && rest <= sizeof(header.name)) {
				memcpy(header.prefix, path, plen);
				memcpy(header.name, path + plen + 1, rest);
			} else {
				sprintf(header.name, "%s.data",
				        sha1_to_hex(sha1));
				strbuf_append_ext_header(&ext_header, "path",
						path, pathlen);
			}
		} else
			memcpy(header.name, path, pathlen);
	}

	if (S_ISLNK(mode) && buffer) {
		if (size > sizeof(header.linkname)) {
			sprintf(header.linkname, "see %s.paxheader",
			        sha1_to_hex(sha1));
			strbuf_append_ext_header(&ext_header, "linkpath",
			                         buffer, size);
		} else
			memcpy(header.linkname, buffer, size);
	}

	prepare_header(args, &header, mode, size);

	if (ext_header.len > 0) {
		err = write_extended_header(args, sha1, ext_header.buf,
					    ext_header.len);
		if (err)
			return err;
	}
	strbuf_release(&ext_header);
	write_blocked(&header, sizeof(header));
	if (S_ISREG(mode) && buffer && size > 0)
		write_blocked(buffer, size);
	return err;
}

static int write_global_extended_header(struct archiver_args *args)
{
	const unsigned char *sha1 = args->commit_sha1;
	struct strbuf ext_header = STRBUF_INIT;
	struct ustar_header header;
	unsigned int mode;
	int err = 0;

	strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
	memset(&header, 0, sizeof(header));
	*header.typeflag = TYPEFLAG_GLOBAL_HEADER;
	mode = 0100666;
	strcpy(header.name, "pax_global_header");
	prepare_header(args, &header, mode, ext_header.len);
	write_blocked(&header, sizeof(header));
	write_blocked(ext_header.buf, ext_header.len);
	strbuf_release(&ext_header);
	return err;
}

static struct archiver **tar_filters;
static int nr_tar_filters;
static int alloc_tar_filters;

static struct archiver *find_tar_filter(const char *name, int len)
{
	int i;
	for (i = 0; i < nr_tar_filters; i++) {
		struct archiver *ar = tar_filters[i];
		if (!strncmp(ar->name, name, len) && !ar->name[len])
			return ar;
	}
	return NULL;
}

static int tar_filter_config(const char *var, const char *value, void *data)
{
	struct archiver *ar;
	const char *dot;
	const char *name;
	const char *type;
	int namelen;

	if (prefixcmp(var, "tar."))
		return 0;
	dot = strrchr(var, '.');
	if (dot == var + 9)
		return 0;

	name = var + 4;
	namelen = dot - name;
	type = dot + 1;

	ar = find_tar_filter(name, namelen);
	if (!ar) {
		ar = xcalloc(1, sizeof(*ar));
		ar->name = xmemdupz(name, namelen);
		ar->write_archive = write_tar_filter_archive;
		ar->flags = ARCHIVER_WANT_COMPRESSION_LEVELS;
		ALLOC_GROW(tar_filters, nr_tar_filters + 1, alloc_tar_filters);
		tar_filters[nr_tar_filters++] = ar;
	}

	if (!strcmp(type, "command")) {
		if (!value)
			return config_error_nonbool(var);
		free(ar->data);
		ar->data = xstrdup(value);
		return 0;
	}
	if (!strcmp(type, "remote")) {
		if (git_config_bool(var, value))
			ar->flags |= ARCHIVER_REMOTE;
		else
			ar->flags &= ~ARCHIVER_REMOTE;
		return 0;
	}

	return 0;
}

static int git_tar_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "tar.umask")) {
		if (value && !strcmp(value, "user")) {
			tar_umask = umask(0);
			umask(tar_umask);
		} else {
			tar_umask = git_config_int(var, value);
		}
		return 0;
	}

	return tar_filter_config(var, value, cb);
}

static int write_tar_archive(const struct archiver *ar,
			     struct archiver_args *args)
{
	int err = 0;

	if (args->commit_sha1)
		err = write_global_extended_header(args);
	if (!err)
		err = write_archive_entries(args, write_tar_entry);
	if (!err)
		write_trailer();
	return err;
}

static int write_tar_filter_archive(const struct archiver *ar,
				    struct archiver_args *args)
{
	struct strbuf cmd = STRBUF_INIT;
	struct child_process filter;
	const char *argv[2];
	int r;

	if (!ar->data)
		die("BUG: tar-filter archiver called with no filter defined");

	strbuf_addstr(&cmd, ar->data);
	if (args->compression_level >= 0)
		strbuf_addf(&cmd, " -%d", args->compression_level);

	memset(&filter, 0, sizeof(filter));
	argv[0] = cmd.buf;
	argv[1] = NULL;
	filter.argv = argv;
	filter.use_shell = 1;
	filter.in = -1;

	if (start_command(&filter) < 0)
		die_errno("unable to start '%s' filter", argv[0]);
	close(1);
	if (dup2(filter.in, 1) < 0)
		die_errno("unable to redirect descriptor");
	close(filter.in);

	r = write_tar_archive(ar, args);

	close(1);
	if (finish_command(&filter) != 0)
		die("'%s' filter reported error", argv[0]);

	strbuf_release(&cmd);
	return r;
}

static struct archiver tar_archiver = {
	"tar",
	write_tar_archive,
	ARCHIVER_REMOTE
};

void init_tar_archiver(void)
{
	int i;
	register_archiver(&tar_archiver);

	tar_filter_config("tar.tgz.command", "gzip -cn", NULL);
	tar_filter_config("tar.tgz.remote", "true", NULL);
	tar_filter_config("tar.tar.gz.command", "gzip -cn", NULL);
	tar_filter_config("tar.tar.gz.remote", "true", NULL);
	git_config(git_tar_config, NULL);
	for (i = 0; i < nr_tar_filters; i++) {
		/* omit any filters that never had a command configured */
		if (tar_filters[i]->data)
			register_archiver(tar_filters[i]);
	}
}
Commit	Line	Data
3d74982f RS	1	/*
	2	* Copyright (c) 2005, 2006 Rene Scharfe
	3	*/
3d74982f	4	#include "cache.h"
3d74982f	5	#include "tar.h"
3d74982f	6	#include "archive.h"
767cf457	7	#include "run-command.h"
3d74982f RS	8
	9	#define RECORDSIZE (512)
	10	#define BLOCKSIZE (RECORDSIZE * 20)
	11
	12	static char block[BLOCKSIZE];
	13	static unsigned long offset;
	14
f08b3b0e	15	static int tar_umask = 002;
3d74982f	16
767cf457 JK	17	static int write_tar_filter_archive(const struct archiver *ar,
	18	struct archiver_args *args);
	19
3d74982f RS	20	/* writes out the whole block, but only if it is full */
	21	static void write_if_needed(void)
	22	{
	23	if (offset == BLOCKSIZE) {
	24	write_or_die(1, block, BLOCKSIZE);
	25	offset = 0;
	26	}
	27	}
	28
	29	/*
	30	* queues up writes, so that all our write(2) calls write exactly one
	31	* full block; pads writes to RECORDSIZE
	32	*/
	33	static void write_blocked(const void *data, unsigned long size)
	34	{
	35	const char *buf = data;
	36	unsigned long tail;
	37
	38	if (offset) {
	39	unsigned long chunk = BLOCKSIZE - offset;
	40	if (size < chunk)
	41	chunk = size;
	42	memcpy(block + offset, buf, chunk);
	43	size -= chunk;
	44	offset += chunk;
	45	buf += chunk;
	46	write_if_needed();
	47	}
	48	while (size >= BLOCKSIZE) {
	49	write_or_die(1, buf, BLOCKSIZE);
	50	size -= BLOCKSIZE;
	51	buf += BLOCKSIZE;
	52	}
	53	if (size) {
	54	memcpy(block + offset, buf, size);
	55	offset += size;
	56	}
	57	tail = offset % RECORDSIZE;
	58	if (tail) {
	59	memset(block + offset, 0, RECORDSIZE - tail);
	60	offset += RECORDSIZE - tail;
	61	}
	62	write_if_needed();
	63	}
	64
	65	/*
	66	* The end of tar archives is marked by 2*512 nul bytes and after that
	67	* follows the rest of the block (if any).
	68	*/
	69	static void write_trailer(void)
	70	{
	71	int tail = BLOCKSIZE - offset;
	72	memset(block + offset, 0, tail);
	73	write_or_die(1, block, BLOCKSIZE);
	74	if (tail < 2 * RECORDSIZE) {
	75	memset(block, 0, offset);
	76	write_or_die(1, block, BLOCKSIZE);
	77	}
	78	}
	79
3d74982f RS	80	/*
	81	* pax extended header records have the format "%u %s=%s\n". %u contains
	82	* the size of the whole string (including the %u), the first %s is the
	83	* keyword, the second one is the value. This function constructs such a
	84	* string and appends it to a struct strbuf.
	85	*/
	86	static void strbuf_append_ext_header(struct strbuf sb, const char keyword,
	87	const char *value, unsigned int valuelen)
	88	{
7a604f16	89	int len, tmp;
3d74982f RS	90
	91	/* "%u %s=%s\n" */
	92	len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1;
	93	for (tmp = len; tmp > 9; tmp /= 10)
	94	len++;
	95
7a604f16 PH	96	strbuf_grow(sb, len);
	97	strbuf_addf(sb, "%u %s=", len, keyword);
	98	strbuf_add(sb, value, valuelen);
	99	strbuf_addch(sb, '\n');
3d74982f RS	100	}
	101
	102	static unsigned int ustar_header_chksum(const struct ustar_header *header)
	103	{
	104	char p = (char )header;
	105	unsigned int chksum = 0;
	106	while (p < header->chksum)
	107	chksum += *p++;
	108	chksum += sizeof(header->chksum) * ' ';
	109	p += sizeof(header->chksum);
	110	while (p < (char *)header + sizeof(struct ustar_header))
	111	chksum += *p++;
	112	return chksum;
	113	}
	114
562e25ab	115	static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen)
3d74982f	116	{
562e25ab	117	size_t i = pathlen;
3d74982f RS	118	if (i > maxlen)
	119	i = maxlen;
	120	do {
	121	i--;
562e25ab	122	} while (i > 0 && path[i] != '/');
3d74982f RS	123	return i;
	124	}
	125
d240d410 NTND	126	static void prepare_header(struct archiver_args *args,
	127	struct ustar_header *header,
	128	unsigned int mode, unsigned long size)
	129	{
	130	sprintf(header->mode, "%07o", mode & 07777);
	131	sprintf(header->size, "%011lo", S_ISREG(mode) ? size : 0);
	132	sprintf(header->mtime, "%011lo", (unsigned long) args->time);
	133
	134	sprintf(header->uid, "%07o", 0);
	135	sprintf(header->gid, "%07o", 0);
	136	strlcpy(header->uname, "root", sizeof(header->uname));
	137	strlcpy(header->gname, "root", sizeof(header->gname));
	138	sprintf(header->devmajor, "%07o", 0);
	139	sprintf(header->devminor, "%07o", 0);
	140
	141	memcpy(header->magic, "ustar", 6);
	142	memcpy(header->version, "00", 2);
	143
	144	sprintf(header->chksum, "%07o", ustar_header_chksum(header));
	145	}
	146
	147	static int write_extended_header(struct archiver_args *args,
	148	const unsigned char *sha1,
	149	const void *buffer, unsigned long size)
	150	{
	151	struct ustar_header header;
	152	unsigned int mode;
	153	memset(&header, 0, sizeof(header));
	154	*header.typeflag = TYPEFLAG_EXT_HEADER;
	155	mode = 0100666;
	156	sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
	157	prepare_header(args, &header, mode, size);
	158	write_blocked(&header, sizeof(header));
	159	write_blocked(buffer, size);
	160	return 0;
	161	}
	162
562e25ab RS	163	static int write_tar_entry(struct archiver_args *args,
	164	const unsigned char sha1, const char path, size_t pathlen,
	165	unsigned int mode, void *buffer, unsigned long size)
3d74982f RS	166	{
3d74982f RS	167	struct ustar_header header;
f285a2d7	168	struct strbuf ext_header = STRBUF_INIT;
562e25ab	169	int err = 0;
3d74982f RS	170
3d74982f RS	171	memset(&header, 0, sizeof(header));
3d74982f RS	172
3d74982f RS	173	if (!sha1) {
d240d410	174	die("BUG: sha1 == NULL is not supported");
3d74982f	175	} else if (!path) {
d240d410	176	die("BUG: path == NULL is not supported");
3d74982f	177	} else {
302b9282	178	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
3d74982f RS	179	*header.typeflag = TYPEFLAG_DIR;
	180	mode = (mode \| 0777) & ~tar_umask;
	181	} else if (S_ISLNK(mode)) {
	182	*header.typeflag = TYPEFLAG_LNK;
	183	mode \|= 0777;
	184	} else if (S_ISREG(mode)) {
	185	*header.typeflag = TYPEFLAG_REG;
	186	mode = (mode \| ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
	187	} else {
562e25ab RS	188	return error("unsupported file mode: 0%o (SHA1: %s)",
562e25ab RS	189	mode, sha1_to_hex(sha1));
3d74982f	190	}
562e25ab RS	191	if (pathlen > sizeof(header.name)) {
	192	size_t plen = get_path_prefix(path, pathlen,
	193	sizeof(header.prefix));
	194	size_t rest = pathlen - plen - 1;
3d74982f	195	if (plen > 0 && rest <= sizeof(header.name)) {
562e25ab RS	196	memcpy(header.prefix, path, plen);
562e25ab RS	197	memcpy(header.name, path + plen + 1, rest);
3d74982f RS	198	} else {
	199	sprintf(header.name, "%s.data",
	200	sha1_to_hex(sha1));
	201	strbuf_append_ext_header(&ext_header, "path",
562e25ab	202	path, pathlen);
3d74982f RS	203	}
3d74982f RS	204	} else
562e25ab	205	memcpy(header.name, path, pathlen);
3d74982f RS	206	}
	207
	208	if (S_ISLNK(mode) && buffer) {
	209	if (size > sizeof(header.linkname)) {
	210	sprintf(header.linkname, "see %s.paxheader",
	211	sha1_to_hex(sha1));
	212	strbuf_append_ext_header(&ext_header, "linkpath",
	213	buffer, size);
	214	} else
	215	memcpy(header.linkname, buffer, size);
	216	}
	217
d240d410	218	prepare_header(args, &header, mode, size);
3d74982f RS	219
3d74982f RS	220	if (ext_header.len > 0) {
d240d410 NTND	221	err = write_extended_header(args, sha1, ext_header.buf,
d240d410 NTND	222	ext_header.len);
562e25ab RS	223	if (err)
562e25ab RS	224	return err;
3d74982f	225	}
7a604f16	226	strbuf_release(&ext_header);
3d74982f RS	227	write_blocked(&header, sizeof(header));
	228	if (S_ISREG(mode) && buffer && size > 0)
	229	write_blocked(buffer, size);
562e25ab	230	return err;
3d74982f RS	231	}
3d74982f RS	232
562e25ab	233	static int write_global_extended_header(struct archiver_args *args)
3d74982f	234	{
562e25ab	235	const unsigned char *sha1 = args->commit_sha1;
f285a2d7	236	struct strbuf ext_header = STRBUF_INIT;
d240d410 NTND	237	struct ustar_header header;
	238	unsigned int mode;
	239	int err = 0;
7a604f16	240
3d74982f	241	strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
d240d410 NTND	242	memset(&header, 0, sizeof(header));
	243	*header.typeflag = TYPEFLAG_GLOBAL_HEADER;
	244	mode = 0100666;
	245	strcpy(header.name, "pax_global_header");
	246	prepare_header(args, &header, mode, ext_header.len);
	247	write_blocked(&header, sizeof(header));
	248	write_blocked(ext_header.buf, ext_header.len);
7a604f16	249	strbuf_release(&ext_header);
562e25ab	250	return err;
3d74982f RS	251	}
3d74982f RS	252
767cf457 JK	253	static struct archiver **tar_filters;
	254	static int nr_tar_filters;
	255	static int alloc_tar_filters;
	256
	257	static struct archiver find_tar_filter(const char name, int len)
	258	{
	259	int i;
	260	for (i = 0; i < nr_tar_filters; i++) {
	261	struct archiver *ar = tar_filters[i];
	262	if (!strncmp(ar->name, name, len) && !ar->name[len])
	263	return ar;
	264	}
	265	return NULL;
	266	}
	267
	268	static int tar_filter_config(const char var, const char value, void *data)
	269	{
	270	struct archiver *ar;
	271	const char *dot;
	272	const char *name;
	273	const char *type;
	274	int namelen;
	275
	276	if (prefixcmp(var, "tar."))
	277	return 0;
	278	dot = strrchr(var, '.');
	279	if (dot == var + 9)
	280	return 0;
	281
	282	name = var + 4;
	283	namelen = dot - name;
	284	type = dot + 1;
	285
	286	ar = find_tar_filter(name, namelen);
	287	if (!ar) {
	288	ar = xcalloc(1, sizeof(*ar));
	289	ar->name = xmemdupz(name, namelen);
	290	ar->write_archive = write_tar_filter_archive;
	291	ar->flags = ARCHIVER_WANT_COMPRESSION_LEVELS;
	292	ALLOC_GROW(tar_filters, nr_tar_filters + 1, alloc_tar_filters);
	293	tar_filters[nr_tar_filters++] = ar;
	294	}
	295
	296	if (!strcmp(type, "command")) {
	297	if (!value)
	298	return config_error_nonbool(var);
	299	free(ar->data);
	300	ar->data = xstrdup(value);
	301	return 0;
	302	}
7b97730b JK	303	if (!strcmp(type, "remote")) {
	304	if (git_config_bool(var, value))
	305	ar->flags \|= ARCHIVER_REMOTE;
	306	else
	307	ar->flags &= ~ARCHIVER_REMOTE;
	308	return 0;
	309	}
767cf457 JK	310
	311	return 0;
	312	}
	313
ef90d6d4	314	static int git_tar_config(const char var, const char value, void *cb)
3d74982f RS	315	{
3d74982f RS	316	if (!strcmp(var, "tar.umask")) {
cc1816b0	317	if (value && !strcmp(value, "user")) {
3d74982f RS	318	tar_umask = umask(0);
	319	umask(tar_umask);
	320	} else {
	321	tar_umask = git_config_int(var, value);
	322	}
	323	return 0;
	324	}
767cf457 JK	325
767cf457 JK	326	return tar_filter_config(var, value, cb);
3d74982f RS	327	}
3d74982f RS	328
4d7c9898 JK	329	static int write_tar_archive(const struct archiver *ar,
4d7c9898 JK	330	struct archiver_args *args)
3d74982f	331	{
562e25ab	332	int err = 0;
3d74982f	333
3d74982f	334	if (args->commit_sha1)
562e25ab RS	335	err = write_global_extended_header(args);
	336	if (!err)
	337	err = write_archive_entries(args, write_tar_entry);
	338	if (!err)
	339	write_trailer();
	340	return err;
3d74982f	341	}
13e0f88d	342
767cf457 JK	343	static int write_tar_filter_archive(const struct archiver *ar,
	344	struct archiver_args *args)
	345	{
	346	struct strbuf cmd = STRBUF_INIT;
	347	struct child_process filter;
	348	const char *argv[2];
	349	int r;
	350
	351	if (!ar->data)
	352	die("BUG: tar-filter archiver called with no filter defined");
	353
	354	strbuf_addstr(&cmd, ar->data);
	355	if (args->compression_level >= 0)
	356	strbuf_addf(&cmd, " -%d", args->compression_level);
	357
	358	memset(&filter, 0, sizeof(filter));
	359	argv[0] = cmd.buf;
	360	argv[1] = NULL;
	361	filter.argv = argv;
	362	filter.use_shell = 1;
	363	filter.in = -1;
	364
	365	if (start_command(&filter) < 0)
	366	die_errno("unable to start '%s' filter", argv[0]);
	367	close(1);
	368	if (dup2(filter.in, 1) < 0)
	369	die_errno("unable to redirect descriptor");
	370	close(filter.in);
	371
	372	r = write_tar_archive(ar, args);
	373
	374	close(1);
	375	if (finish_command(&filter) != 0)
	376	die("'%s' filter reported error", argv[0]);
	377
	378	strbuf_release(&cmd);
	379	return r;
	380	}
	381
13e0f88d JK	382	static struct archiver tar_archiver = {
	383	"tar",
	384	write_tar_archive,
7b97730b	385	ARCHIVER_REMOTE
13e0f88d JK	386	};
	387
	388	void init_tar_archiver(void)
	389	{
767cf457	390	int i;
13e0f88d	391	register_archiver(&tar_archiver);
767cf457	392
0e804e09	393	tar_filter_config("tar.tgz.command", "gzip -cn", NULL);
7b97730b	394	tar_filter_config("tar.tgz.remote", "true", NULL);
0e804e09	395	tar_filter_config("tar.tar.gz.command", "gzip -cn", NULL);
7b97730b	396	tar_filter_config("tar.tar.gz.remote", "true", NULL);
13e0f88d	397	git_config(git_tar_config, NULL);
767cf457 JK	398	for (i = 0; i < nr_tar_filters; i++) {
	399	/* omit any filters that never had a command configured */
	400	if (tar_filters[i]->data)
	401	register_archiver(tar_filters[i]);
	402	}
13e0f88d	403	}