[thirdparty/git.git] / builtin-tar-tree.c

/*
 * Copyright (c) 2005, 2006 Rene Scharfe
 */
#include <time.h>
#include "cache.h"
#include "commit.h"
#include "strbuf.h"
#include "tar.h"
#include "builtin.h"
#include "pkt-line.h"
#include "archive.h"

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

static const char tar_tree_usage[] =
"git-tar-tree [--remote=<repo>] <tree-ish> [basedir]";

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

static time_t archive_time;
static int tar_umask;
static int verbose;

/* 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);
	}
}

static void strbuf_append_string(struct strbuf *sb, const char *s)
{
	int slen = strlen(s);
	int total = sb->len + slen;
	if (total > sb->alloc) {
		sb->buf = xrealloc(sb->buf, total);
		sb->alloc = total;
	}
	memcpy(sb->buf + sb->len, s, slen);
	sb->len = total;
}

/*
 * 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)
{
	char *p;
	int len, total, tmp;

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

	total = sb->len + len;
	if (total > sb->alloc) {
		sb->buf = xrealloc(sb->buf, total);
		sb->alloc = total;
	}

	p = sb->buf;
	p += sprintf(p, "%u %s=", len, keyword);
	memcpy(p, value, valuelen);
	p += valuelen;
	*p = '\n';
	sb->len = total;
}

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 int get_path_prefix(const struct strbuf *path, int maxlen)
{
	int i = path->len;
	if (i > maxlen)
		i = maxlen;
	do {
		i--;
	} while (i > 0 && path->buf[i] != '/');
	return i;
}

static void write_entry(const unsigned char *sha1, struct strbuf *path,
                        unsigned int mode, void *buffer, unsigned long size)
{
	struct ustar_header header;
	struct strbuf ext_header;

	memset(&header, 0, sizeof(header));
	ext_header.buf = NULL;
	ext_header.len = ext_header.alloc = 0;

	if (!sha1) {
		*header.typeflag = TYPEFLAG_GLOBAL_HEADER;
		mode = 0100666;
		strcpy(header.name, "pax_global_header");
	} else if (!path) {
		*header.typeflag = TYPEFLAG_EXT_HEADER;
		mode = 0100666;
		sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
	} else {
		if (verbose)
			fprintf(stderr, "%.*s\n", path->len, path->buf);
		if (S_ISDIR(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 {
			error("unsupported file mode: 0%o (SHA1: %s)",
			      mode, sha1_to_hex(sha1));
			return;
		}
		if (path->len > sizeof(header.name)) {
			int plen = get_path_prefix(path, sizeof(header.prefix));
			int rest = path->len - plen - 1;
			if (plen > 0 && rest <= sizeof(header.name)) {
				memcpy(header.prefix, path->buf, plen);
				memcpy(header.name, path->buf + plen + 1, rest);
			} else {
				sprintf(header.name, "%s.data",
				        sha1_to_hex(sha1));
				strbuf_append_ext_header(&ext_header, "path",
				                         path->buf, path->len);
			}
		} else
			memcpy(header.name, path->buf, path->len);
	}

	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);
	}

	sprintf(header.mode, "%07o", mode & 07777);
	sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0);
	sprintf(header.mtime, "%011lo", archive_time);

	/* XXX: should we provide more meaningful info here? */
	sprintf(header.uid, "%07o", 0);
	sprintf(header.gid, "%07o", 0);
	strlcpy(header.uname, "git", sizeof(header.uname));
	strlcpy(header.gname, "git", 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));

	if (ext_header.len > 0) {
		write_entry(sha1, NULL, 0, ext_header.buf, ext_header.len);
		free(ext_header.buf);
	}
	write_blocked(&header, sizeof(header));
	if (S_ISREG(mode) && buffer && size > 0)
		write_blocked(buffer, size);
}

static void write_global_extended_header(const unsigned char *sha1)
{
	struct strbuf ext_header;
	ext_header.buf = NULL;
	ext_header.len = ext_header.alloc = 0;
	strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
	write_entry(NULL, NULL, 0, ext_header.buf, ext_header.len);
	free(ext_header.buf);
}

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

static int generate_tar(int argc, const char **argv, const char *prefix)
{
	struct archiver_args args;
	int result;
	char *base = NULL;

	git_config(git_tar_config);

	memset(&args, 0, sizeof(args));
	if (argc != 2 && argc != 3)
		usage(tar_tree_usage);
	if (argc == 3) {
		int baselen = strlen(argv[2]);
		base = xmalloc(baselen + 2);
		memcpy(base, argv[2], baselen);
		base[baselen] = '/';
		base[baselen + 1] = '\0';
	}
	args.base = base;
	parse_treeish_arg(argv + 1, &args, NULL);

	result = write_tar_archive(&args);
	free(base);

	return result;
}

static int write_tar_entry(const unsigned char *sha1,
                           const char *base, int baselen,
                           const char *filename, unsigned mode, int stage)
{
	static struct strbuf path;
	int filenamelen = strlen(filename);
	void *buffer;
	char type[20];
	unsigned long size;

	if (!path.alloc) {
		path.buf = xmalloc(PATH_MAX);
		path.alloc = PATH_MAX;
		path.len = path.eof = 0;
	}
	if (path.alloc < baselen + filenamelen) {
		free(path.buf);
		path.buf = xmalloc(baselen + filenamelen);
		path.alloc = baselen + filenamelen;
	}
	memcpy(path.buf, base, baselen);
	memcpy(path.buf + baselen, filename, filenamelen);
	path.len = baselen + filenamelen;
	if (S_ISDIR(mode)) {
		strbuf_append_string(&path, "/");
		buffer = NULL;
		size = 0;
	} else {
		buffer = read_sha1_file(sha1, type, &size);
		if (!buffer)
			die("cannot read %s", sha1_to_hex(sha1));
	}

	write_entry(sha1, &path, mode, buffer, size);
	free(buffer);

	return READ_TREE_RECURSIVE;
}

int write_tar_archive(struct archiver_args *args)
{
	int plen = args->base ? strlen(args->base) : 0;

	git_config(git_tar_config);

	archive_time = args->time;
	verbose = args->verbose;

	if (args->commit_sha1)
		write_global_extended_header(args->commit_sha1);

	if (args->base && plen > 0 && args->base[plen - 1] == '/') {
		char *base = xstrdup(args->base);
		int baselen = strlen(base);

		while (baselen > 0 && base[baselen - 1] == '/')
			base[--baselen] = '\0';
		write_tar_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
		free(base);
	}
	read_tree_recursive(args->tree, args->base, plen, 0,
			    args->pathspec, write_tar_entry);
	write_trailer();

	return 0;
}

static const char *exec = "git-upload-tar";

static int remote_tar(int argc, const char **argv)
{
	int fd[2], ret, len;
	pid_t pid;
	char buf[1024];
	char *url;

	if (argc < 3 || 4 < argc)
		usage(tar_tree_usage);

	/* --remote=<repo> */
	url = xstrdup(argv[1]+9);
	pid = git_connect(fd, url, exec);
	if (pid < 0)
		return 1;

	packet_write(fd[1], "want %s\n", argv[2]);
	if (argv[3])
		packet_write(fd[1], "base %s\n", argv[3]);
	packet_flush(fd[1]);

	len = packet_read_line(fd[0], buf, sizeof(buf));
	if (!len)
		die("git-tar-tree: expected ACK/NAK, got EOF");
	if (buf[len-1] == '\n')
		buf[--len] = 0;
	if (strcmp(buf, "ACK")) {
		if (5 < len && !strncmp(buf, "NACK ", 5))
			die("git-tar-tree: NACK %s", buf + 5);
		die("git-tar-tree: protocol error");
	}
	/* expect a flush */
	len = packet_read_line(fd[0], buf, sizeof(buf));
	if (len)
		die("git-tar-tree: expected a flush");

	/* Now, start reading from fd[0] and spit it out to stdout */
	ret = copy_fd(fd[0], 1);
	close(fd[0]);

	ret |= finish_connect(pid);
	return !!ret;
}

int cmd_tar_tree(int argc, const char **argv, const char *prefix)
{
	if (argc < 2)
		usage(tar_tree_usage);
	if (!strncmp("--remote=", argv[1], 9))
		return remote_tar(argc, argv);
	return generate_tar(argc, argv, prefix);
}

/* ustar header + extended global header content */
#define HEADERSIZE (2 * RECORDSIZE)

int cmd_get_tar_commit_id(int argc, const char **argv, const char *prefix)
{
	char buffer[HEADERSIZE];
	struct ustar_header *header = (struct ustar_header *)buffer;
	char *content = buffer + RECORDSIZE;
	ssize_t n;

	n = xread(0, buffer, HEADERSIZE);
	if (n < HEADERSIZE)
		die("git-get-tar-commit-id: read error");
	if (header->typeflag[0] != 'g')
		return 1;
	if (memcmp(content, "52 comment=", 11))
		return 1;

	n = xwrite(1, content + 11, 41);
	if (n < 41)
		die("git-get-tar-commit-id: write error");

	return 0;
}
Commit	Line	Data
92747a90	1	/*
ae64bbc1	2	* Copyright (c) 2005, 2006 Rene Scharfe
92747a90	3	*/
731ab9cc RS	4	#include <time.h>
731ab9cc RS	5	#include "cache.h"
c3f92812	6	#include "commit.h"
ae64bbc1 RS	7	#include "strbuf.h"
ae64bbc1 RS	8	#include "tar.h"
56d1398a	9	#include "builtin.h"
21754264	10	#include "pkt-line.h"
efd8696c	11	#include "archive.h"
731ab9cc RS	12
	13	#define RECORDSIZE (512)
	14	#define BLOCKSIZE (RECORDSIZE * 20)
	15
21754264	16	static const char tar_tree_usage[] =
3f0073a2	17	"git-tar-tree [--remote=<repo>] <tree-ish> [basedir]";
731ab9cc RS	18
	19	static char block[BLOCKSIZE];
	20	static unsigned long offset;
	21
731ab9cc	22	static time_t archive_time;
ce1a79b6	23	static int tar_umask;
e0ffb248	24	static int verbose;
731ab9cc	25
731ab9cc RS	26	/* writes out the whole block, but only if it is full */
	27	static void write_if_needed(void)
	28	{
	29	if (offset == BLOCKSIZE) {
7230e6d0	30	write_or_die(1, block, BLOCKSIZE);
731ab9cc RS	31	offset = 0;
	32	}
	33	}
	34
731ab9cc RS	35	/*
	36	* queues up writes, so that all our write(2) calls write exactly one
	37	* full block; pads writes to RECORDSIZE
	38	*/
6698060c	39	static void write_blocked(const void *data, unsigned long size)
731ab9cc	40	{
6698060c	41	const char *buf = data;
731ab9cc RS	42	unsigned long tail;
	43
	44	if (offset) {
	45	unsigned long chunk = BLOCKSIZE - offset;
	46	if (size < chunk)
	47	chunk = size;
	48	memcpy(block + offset, buf, chunk);
	49	size -= chunk;
	50	offset += chunk;
	51	buf += chunk;
	52	write_if_needed();
	53	}
	54	while (size >= BLOCKSIZE) {
7230e6d0	55	write_or_die(1, buf, BLOCKSIZE);
731ab9cc RS	56	size -= BLOCKSIZE;
	57	buf += BLOCKSIZE;
	58	}
	59	if (size) {
	60	memcpy(block + offset, buf, size);
731ab9cc RS	61	offset += size;
	62	}
	63	tail = offset % RECORDSIZE;
	64	if (tail) {
	65	memset(block + offset, 0, RECORDSIZE - tail);
	66	offset += RECORDSIZE - tail;
	67	}
	68	write_if_needed();
	69	}
	70
37958be7 RS	71	/*
	72	* The end of tar archives is marked by 2*512 nul bytes and after that
	73	* follows the rest of the block (if any).
	74	*/
	75	static void write_trailer(void)
	76	{
	77	int tail = BLOCKSIZE - offset;
	78	memset(block + offset, 0, tail);
7230e6d0	79	write_or_die(1, block, BLOCKSIZE);
37958be7 RS	80	if (tail < 2 * RECORDSIZE) {
37958be7 RS	81	memset(block, 0, offset);
7230e6d0	82	write_or_die(1, block, BLOCKSIZE);
37958be7 RS	83	}
	84	}
	85
cb0c6df6	86	static void strbuf_append_string(struct strbuf sb, const char s)
731ab9cc	87	{
cb0c6df6 RS	88	int slen = strlen(s);
	89	int total = sb->len + slen;
	90	if (total > sb->alloc) {
	91	sb->buf = xrealloc(sb->buf, total);
	92	sb->alloc = total;
731ab9cc	93	}
cb0c6df6 RS	94	memcpy(sb->buf + sb->len, s, slen);
cb0c6df6 RS	95	sb->len = total;
731ab9cc RS	96	}
731ab9cc RS	97
ae64bbc1 RS	98	/*
	99	* pax extended header records have the format "%u %s=%s\n". %u contains
	100	* the size of the whole string (including the %u), the first %s is the
	101	* keyword, the second one is the value. This function constructs such a
	102	* string and appends it to a struct strbuf.
	103	*/
	104	static void strbuf_append_ext_header(struct strbuf sb, const char keyword,
	105	const char *value, unsigned int valuelen)
71058b1f	106	{
ae64bbc1 RS	107	char *p;
ae64bbc1 RS	108	int len, total, tmp;
71058b1f	109
71058b1f	110	/* "%u %s=%s\n" */
ae64bbc1 RS	111	len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1;
ae64bbc1 RS	112	for (tmp = len; tmp > 9; tmp /= 10)
71058b1f	113	len++;
71058b1f	114
ae64bbc1 RS	115	total = sb->len + len;
	116	if (total > sb->alloc) {
	117	sb->buf = xrealloc(sb->buf, total);
	118	sb->alloc = total;
	119	}
71058b1f	120
ae64bbc1 RS	121	p = sb->buf;
	122	p += sprintf(p, "%u %s=", len, keyword);
	123	memcpy(p, value, valuelen);
	124	p += valuelen;
	125	*p = '\n';
	126	sb->len = total;
	127	}
731ab9cc	128
ae64bbc1	129	static unsigned int ustar_header_chksum(const struct ustar_header *header)
731ab9cc	130	{
ae64bbc1 RS	131	char p = (char )header;
	132	unsigned int chksum = 0;
	133	while (p < header->chksum)
	134	chksum += *p++;
	135	chksum += sizeof(header->chksum) * ' ';
	136	p += sizeof(header->chksum);
	137	while (p < (char *)header + sizeof(struct ustar_header))
	138	chksum += *p++;
	139	return chksum;
731ab9cc RS	140	}
731ab9cc RS	141
4c691724	142	static int get_path_prefix(const struct strbuf *path, int maxlen)
87fec8fc	143	{
4c691724 RS	144	int i = path->len;
	145	if (i > maxlen)
	146	i = maxlen;
17cf250a	147	do {
4c691724	148	i--;
17cf250a	149	} while (i > 0 && path->buf[i] != '/');
4c691724	150	return i;
87fec8fc RS	151	}
87fec8fc RS	152
ae64bbc1 RS	153	static void write_entry(const unsigned char sha1, struct strbuf path,
ae64bbc1 RS	154	unsigned int mode, void *buffer, unsigned long size)
731ab9cc	155	{
ae64bbc1 RS	156	struct ustar_header header;
	157	struct strbuf ext_header;
	158
	159	memset(&header, 0, sizeof(header));
	160	ext_header.buf = NULL;
	161	ext_header.len = ext_header.alloc = 0;
	162
	163	if (!sha1) {
	164	*header.typeflag = TYPEFLAG_GLOBAL_HEADER;
	165	mode = 0100666;
	166	strcpy(header.name, "pax_global_header");
	167	} else if (!path) {
	168	*header.typeflag = TYPEFLAG_EXT_HEADER;
	169	mode = 0100666;
	170	sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
731ab9cc	171	} else {
e0ffb248 JH	172	if (verbose)
e0ffb248 JH	173	fprintf(stderr, "%.*s\n", path->len, path->buf);
ae64bbc1 RS	174	if (S_ISDIR(mode)) {
ae64bbc1 RS	175	*header.typeflag = TYPEFLAG_DIR;
ce1a79b6	176	mode = (mode \| 0777) & ~tar_umask;
ae64bbc1 RS	177	} else if (S_ISLNK(mode)) {
	178	*header.typeflag = TYPEFLAG_LNK;
	179	mode \|= 0777;
	180	} else if (S_ISREG(mode)) {
	181	*header.typeflag = TYPEFLAG_REG;
ce1a79b6	182	mode = (mode \| ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
ae64bbc1 RS	183	} else {
	184	error("unsupported file mode: 0%o (SHA1: %s)",
	185	mode, sha1_to_hex(sha1));
	186	return;
	187	}
	188	if (path->len > sizeof(header.name)) {
4c691724 RS	189	int plen = get_path_prefix(path, sizeof(header.prefix));
	190	int rest = path->len - plen - 1;
	191	if (plen > 0 && rest <= sizeof(header.name)) {
	192	memcpy(header.prefix, path->buf, plen);
	193	memcpy(header.name, path->buf + plen + 1, rest);
	194	} else {
	195	sprintf(header.name, "%s.data",
	196	sha1_to_hex(sha1));
	197	strbuf_append_ext_header(&ext_header, "path",
	198	path->buf, path->len);
	199	}
ae64bbc1 RS	200	} else
ae64bbc1 RS	201	memcpy(header.name, path->buf, path->len);
731ab9cc RS	202	}
731ab9cc RS	203
ae64bbc1 RS	204	if (S_ISLNK(mode) && buffer) {
	205	if (size > sizeof(header.linkname)) {
	206	sprintf(header.linkname, "see %s.paxheader",
d5776d50	207	sha1_to_hex(sha1));
ae64bbc1 RS	208	strbuf_append_ext_header(&ext_header, "linkpath",
	209	buffer, size);
	210	} else
	211	memcpy(header.linkname, buffer, size);
d5776d50 RS	212	}
d5776d50 RS	213
ae64bbc1 RS	214	sprintf(header.mode, "%07o", mode & 07777);
	215	sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0);
	216	sprintf(header.mtime, "%011lo", archive_time);
731ab9cc RS	217
731ab9cc RS	218	/* XXX: should we provide more meaningful info here? */
ae64bbc1 RS	219	sprintf(header.uid, "%07o", 0);
ae64bbc1 RS	220	sprintf(header.gid, "%07o", 0);
817151e6 PE	221	strlcpy(header.uname, "git", sizeof(header.uname));
817151e6 PE	222	strlcpy(header.gname, "git", sizeof(header.gname));
ae64bbc1 RS	223	sprintf(header.devmajor, "%07o", 0);
ae64bbc1 RS	224	sprintf(header.devminor, "%07o", 0);
731ab9cc	225
ae64bbc1 RS	226	memcpy(header.magic, "ustar", 6);
ae64bbc1 RS	227	memcpy(header.version, "00", 2);
731ab9cc	228
ae64bbc1	229	sprintf(header.chksum, "%07o", ustar_header_chksum(&header));
731ab9cc	230
ae64bbc1 RS	231	if (ext_header.len > 0) {
	232	write_entry(sha1, NULL, 0, ext_header.buf, ext_header.len);
	233	free(ext_header.buf);
	234	}
	235	write_blocked(&header, sizeof(header));
	236	if (S_ISREG(mode) && buffer && size > 0)
	237	write_blocked(buffer, size);
	238	}
731ab9cc	239
bf0f910d	240	static void write_global_extended_header(const unsigned char *sha1)
87fec8fc	241	{
ae64bbc1 RS	242	struct strbuf ext_header;
	243	ext_header.buf = NULL;
	244	ext_header.len = ext_header.alloc = 0;
	245	strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
	246	write_entry(NULL, NULL, 0, ext_header.buf, ext_header.len);
	247	free(ext_header.buf);
731ab9cc RS	248	}
731ab9cc RS	249
b5bf7cd6	250	static int git_tar_config(const char var, const char value)
ce1a79b6 WT	251	{
	252	if (!strcmp(var, "tar.umask")) {
	253	if (!strcmp(value, "user")) {
	254	tar_umask = umask(0);
	255	umask(tar_umask);
	256	} else {
	257	tar_umask = git_config_int(var, value);
	258	}
	259	return 0;
	260	}
	261	return git_default_config(var, value);
	262	}
	263
a633fca0	264	static int generate_tar(int argc, const char *argv, const char prefix)
731ab9cc	265	{
87af29f0 RS	266	struct archiver_args args;
	267	int result;
	268	char *base = NULL;
731ab9cc	269
ce1a79b6	270	git_config(git_tar_config);
53228a5f	271
87af29f0 RS	272	memset(&args, 0, sizeof(args));
87af29f0 RS	273	if (argc != 2 && argc != 3)
731ab9cc	274	usage(tar_tree_usage);
87af29f0 RS	275	if (argc == 3) {
	276	int baselen = strlen(argv[2]);
	277	base = xmalloc(baselen + 2);
	278	memcpy(base, argv[2], baselen);
	279	base[baselen] = '/';
	280	base[baselen + 1] = '\0';
731ab9cc	281	}
87af29f0 RS	282	args.base = base;
87af29f0 RS	283	parse_treeish_arg(argv + 1, &args, NULL);
731ab9cc	284
87af29f0 RS	285	result = write_tar_archive(&args);
	286	free(base);
	287
	288	return result;
731ab9cc	289	}
21754264	290
efd8696c FBH	291	static int write_tar_entry(const unsigned char *sha1,
	292	const char *base, int baselen,
	293	const char *filename, unsigned mode, int stage)
	294	{
	295	static struct strbuf path;
	296	int filenamelen = strlen(filename);
	297	void *buffer;
	298	char type[20];
	299	unsigned long size;
	300
	301	if (!path.alloc) {
	302	path.buf = xmalloc(PATH_MAX);
	303	path.alloc = PATH_MAX;
	304	path.len = path.eof = 0;
	305	}
	306	if (path.alloc < baselen + filenamelen) {
	307	free(path.buf);
	308	path.buf = xmalloc(baselen + filenamelen);
	309	path.alloc = baselen + filenamelen;
	310	}
	311	memcpy(path.buf, base, baselen);
	312	memcpy(path.buf + baselen, filename, filenamelen);
	313	path.len = baselen + filenamelen;
	314	if (S_ISDIR(mode)) {
	315	strbuf_append_string(&path, "/");
	316	buffer = NULL;
	317	size = 0;
	318	} else {
	319	buffer = read_sha1_file(sha1, type, &size);
	320	if (!buffer)
	321	die("cannot read %s", sha1_to_hex(sha1));
	322	}
	323
	324	write_entry(sha1, &path, mode, buffer, size);
	325	free(buffer);
	326
	327	return READ_TREE_RECURSIVE;
	328	}
	329
	330	int write_tar_archive(struct archiver_args *args)
	331	{
87af29f0	332	int plen = args->base ? strlen(args->base) : 0;
efd8696c FBH	333
	334	git_config(git_tar_config);
	335
	336	archive_time = args->time;
e0ffb248	337	verbose = args->verbose;
efd8696c FBH	338
	339	if (args->commit_sha1)
	340	write_global_extended_header(args->commit_sha1);
	341
	342	if (args->base && plen > 0 && args->base[plen - 1] == '/') {
326711c1	343	char *base = xstrdup(args->base);
efd8696c FBH	344	int baselen = strlen(base);
	345
	346	while (baselen > 0 && base[baselen - 1] == '/')
	347	base[--baselen] = '\0';
	348	write_tar_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
	349	free(base);
	350	}
	351	read_tree_recursive(args->tree, args->base, plen, 0,
	352	args->pathspec, write_tar_entry);
	353	write_trailer();
	354
	355	return 0;
	356	}
	357
21754264 JH	358	static const char *exec = "git-upload-tar";
	359
	360	static int remote_tar(int argc, const char **argv)
	361	{
	362	int fd[2], ret, len;
	363	pid_t pid;
	364	char buf[1024];
	365	char *url;
	366
	367	if (argc < 3 \|\| 4 < argc)
	368	usage(tar_tree_usage);
	369
	370	/* --remote=<repo> */
9befac47	371	url = xstrdup(argv[1]+9);
21754264 JH	372	pid = git_connect(fd, url, exec);
	373	if (pid < 0)
	374	return 1;
	375
	376	packet_write(fd[1], "want %s\n", argv[2]);
	377	if (argv[3])
	378	packet_write(fd[1], "base %s\n", argv[3]);
	379	packet_flush(fd[1]);
	380
	381	len = packet_read_line(fd[0], buf, sizeof(buf));
	382	if (!len)
	383	die("git-tar-tree: expected ACK/NAK, got EOF");
	384	if (buf[len-1] == '\n')
	385	buf[--len] = 0;
	386	if (strcmp(buf, "ACK")) {
	387	if (5 < len && !strncmp(buf, "NACK ", 5))
	388	die("git-tar-tree: NACK %s", buf + 5);
	389	die("git-tar-tree: protocol error");
	390	}
	391	/* expect a flush */
	392	len = packet_read_line(fd[0], buf, sizeof(buf));
	393	if (len)
	394	die("git-tar-tree: expected a flush");
	395
	396	/* Now, start reading from fd[0] and spit it out to stdout */
	397	ret = copy_fd(fd[0], 1);
	398	close(fd[0]);
	399
	400	ret \|= finish_connect(pid);
	401	return !!ret;
	402	}
	403
a633fca0	404	int cmd_tar_tree(int argc, const char *argv, const char prefix)
21754264 JH	405	{
	406	if (argc < 2)
	407	usage(tar_tree_usage);
	408	if (!strncmp("--remote=", argv[1], 9))
	409	return remote_tar(argc, argv);
a633fca0	410	return generate_tar(argc, argv, prefix);
21754264	411	}
52ba03cb RS	412
	413	/* ustar header + extended global header content */
	414	#define HEADERSIZE (2 * RECORDSIZE)
	415
a633fca0	416	int cmd_get_tar_commit_id(int argc, const char *argv, const char prefix)
52ba03cb RS	417	{
	418	char buffer[HEADERSIZE];
	419	struct ustar_header header = (struct ustar_header )buffer;
	420	char *content = buffer + RECORDSIZE;
	421	ssize_t n;
	422
	423	n = xread(0, buffer, HEADERSIZE);
	424	if (n < HEADERSIZE)
	425	die("git-get-tar-commit-id: read error");
	426	if (header->typeflag[0] != 'g')
	427	return 1;
	428	if (memcmp(content, "52 comment=", 11))
	429	return 1;
	430
	431	n = xwrite(1, content + 11, 41);
	432	if (n < 41)
	433	die("git-get-tar-commit-id: write error");
	434
	435	return 0;
	436	}