[thirdparty/git.git] / archive.c

#include "cache.h"
#include "commit.h"
#include "tree-walk.h"
#include "attr.h"
#include "archive.h"
#include "parse-options.h"
#include "unpack-trees.h"

static char const * const archive_usage[] = {
	"git archive [options] <tree-ish> [path...]",
	"git archive --list",
	"git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [path...]",
	"git archive --remote <repo> [--exec <cmd>] --list",
	NULL
};

#define USES_ZLIB_COMPRESSION 1

static const struct archiver {
	const char *name;
	write_archive_fn_t write_archive;
	unsigned int flags;
} archivers[] = {
	{ "tar", write_tar_archive },
	{ "zip", write_zip_archive, USES_ZLIB_COMPRESSION },
};

static void format_subst(const struct commit *commit,
                         const char *src, size_t len,
                         struct strbuf *buf)
{
	char *to_free = NULL;
	struct strbuf fmt = STRBUF_INIT;

	if (src == buf->buf)
		to_free = strbuf_detach(buf, NULL);
	for (;;) {
		const char *b, *c;

		b = memmem(src, len, "$Format:", 8);
		if (!b)
			break;
		c = memchr(b + 8, '$', (src + len) - b - 8);
		if (!c)
			break;

		strbuf_reset(&fmt);
		strbuf_add(&fmt, b + 8, c - b - 8);

		strbuf_add(buf, src, b - src);
		format_commit_message(commit, fmt.buf, buf, DATE_NORMAL);
		len -= c + 1 - src;
		src  = c + 1;
	}
	strbuf_add(buf, src, len);
	strbuf_release(&fmt);
	free(to_free);
}

static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
		unsigned int mode, enum object_type *type,
		unsigned long *sizep, const struct commit *commit)
{
	void *buffer;

	buffer = read_sha1_file(sha1, type, sizep);
	if (buffer && S_ISREG(mode)) {
		struct strbuf buf = STRBUF_INIT;
		size_t size = 0;

		strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
		convert_to_working_tree(path, buf.buf, buf.len, &buf);
		if (commit)
			format_subst(commit, buf.buf, buf.len, &buf);
		buffer = strbuf_detach(&buf, &size);
		*sizep = size;
	}

	return buffer;
}

static void setup_archive_check(struct git_attr_check *check)
{
	static struct git_attr *attr_export_ignore;
	static struct git_attr *attr_export_subst;

	if (!attr_export_ignore) {
		attr_export_ignore = git_attr("export-ignore", 13);
		attr_export_subst = git_attr("export-subst", 12);
	}
	check[0].attr = attr_export_ignore;
	check[1].attr = attr_export_subst;
}

struct archiver_context {
	struct archiver_args *args;
	write_archive_entry_fn_t write_entry;
};

static int write_archive_entry(const unsigned char *sha1, const char *base,
		int baselen, const char *filename, unsigned mode, int stage,
		void *context)
{
	static struct strbuf path = STRBUF_INIT;
	struct archiver_context *c = context;
	struct archiver_args *args = c->args;
	write_archive_entry_fn_t write_entry = c->write_entry;
	struct git_attr_check check[2];
	const char *path_without_prefix;
	int convert = 0;
	int err;
	enum object_type type;
	unsigned long size;
	void *buffer;

	strbuf_reset(&path);
	strbuf_grow(&path, PATH_MAX);
	strbuf_add(&path, base, baselen);
	strbuf_addstr(&path, filename);
	path_without_prefix = path.buf + args->baselen;

	setup_archive_check(check);
	if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
		if (ATTR_TRUE(check[0].value))
			return 0;
		convert = ATTR_TRUE(check[1].value);
	}

	if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
		strbuf_addch(&path, '/');
		if (args->verbose)
			fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
		err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
		if (err)
			return err;
		return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
	}

	buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
			&type, &size, convert ? args->commit : NULL);
	if (!buffer)
		return error("cannot read %s", sha1_to_hex(sha1));
	if (args->verbose)
		fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
	err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
	free(buffer);
	return err;
}

int write_archive_entries(struct archiver_args *args,
		write_archive_entry_fn_t write_entry)
{
	struct archiver_context context;
	struct unpack_trees_options opts;
	struct tree_desc t;
	int err;

	if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
		size_t len = args->baselen;

		while (len > 1 && args->base[len - 2] == '/')
			len--;
		if (args->verbose)
			fprintf(stderr, "%.*s\n", (int)len, args->base);
		err = write_entry(args, args->tree->object.sha1, args->base,
				len, 040777, NULL, 0);
		if (err)
			return err;
	}

	context.args = args;
	context.write_entry = write_entry;

	/*
	 * Setup index and instruct attr to read index only
	 */
	if (!args->worktree_attributes) {
		memset(&opts, 0, sizeof(opts));
		opts.index_only = 1;
		opts.head_idx = -1;
		opts.src_index = &the_index;
		opts.dst_index = &the_index;
		opts.fn = oneway_merge;
		init_tree_desc(&t, args->tree->buffer, args->tree->size);
		if (unpack_trees(1, &t, &opts))
			return -1;
		git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
	}

	err =  read_tree_recursive(args->tree, args->base, args->baselen, 0,
			args->pathspec, write_archive_entry, &context);
	if (err == READ_TREE_RECURSIVE)
		err = 0;
	return err;
}

static const struct archiver *lookup_archiver(const char *name)
{
	int i;

	if (!name)
		return NULL;

	for (i = 0; i < ARRAY_SIZE(archivers); i++) {
		if (!strcmp(name, archivers[i].name))
			return &archivers[i];
	}
	return NULL;
}

static void parse_pathspec_arg(const char **pathspec,
		struct archiver_args *ar_args)
{
	ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
}

static void parse_treeish_arg(const char **argv,
		struct archiver_args *ar_args, const char *prefix)
{
	const char *name = argv[0];
	const unsigned char *commit_sha1;
	time_t archive_time;
	struct tree *tree;
	const struct commit *commit;
	unsigned char sha1[20];

	if (get_sha1(name, sha1))
		die("Not a valid object name");

	commit = lookup_commit_reference_gently(sha1, 1);
	if (commit) {
		commit_sha1 = commit->object.sha1;
		archive_time = commit->date;
	} else {
		commit_sha1 = NULL;
		archive_time = time(NULL);
	}

	tree = parse_tree_indirect(sha1);
	if (tree == NULL)
		die("not a tree object");

	if (prefix) {
		unsigned char tree_sha1[20];
		unsigned int mode;
		int err;

		err = get_tree_entry(tree->object.sha1, prefix,
				     tree_sha1, &mode);
		if (err || !S_ISDIR(mode))
			die("current working directory is untracked");

		tree = parse_tree_indirect(tree_sha1);
	}
	ar_args->tree = tree;
	ar_args->commit_sha1 = commit_sha1;
	ar_args->commit = commit;
	ar_args->time = archive_time;
}

#define OPT__COMPR(s, v, h, p) \
	{ OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
	  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
#define OPT__COMPR_HIDDEN(s, v, p) \
	{ OPTION_SET_INT, (s), NULL, (v), NULL, "", \
	  PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }

static int parse_archive_args(int argc, const char **argv,
		const struct archiver **ar, struct archiver_args *args)
{
	const char *format = "tar";
	const char *base = NULL;
	const char *remote = NULL;
	const char *exec = NULL;
	const char *output = NULL;
	int compression_level = -1;
	int verbose = 0;
	int i;
	int list = 0;
	int worktree_attributes = 0;
	struct option opts[] = {
		OPT_GROUP(""),
		OPT_STRING(0, "format", &format, "fmt", "archive format"),
		OPT_STRING(0, "prefix", &base, "prefix",
			"prepend prefix to each pathname in the archive"),
		OPT_STRING(0, "output", &output, "file",
			"write the archive to this file"),
		OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
			"read .gitattributes in working directory"),
		OPT__VERBOSE(&verbose),
		OPT__COMPR('0', &compression_level, "store only", 0),
		OPT__COMPR('1', &compression_level, "compress faster", 1),
		OPT__COMPR_HIDDEN('2', &compression_level, 2),
		OPT__COMPR_HIDDEN('3', &compression_level, 3),
		OPT__COMPR_HIDDEN('4', &compression_level, 4),
		OPT__COMPR_HIDDEN('5', &compression_level, 5),
		OPT__COMPR_HIDDEN('6', &compression_level, 6),
		OPT__COMPR_HIDDEN('7', &compression_level, 7),
		OPT__COMPR_HIDDEN('8', &compression_level, 8),
		OPT__COMPR('9', &compression_level, "compress better", 9),
		OPT_GROUP(""),
		OPT_BOOLEAN('l', "list", &list,
			"list supported archive formats"),
		OPT_GROUP(""),
		OPT_STRING(0, "remote", &remote, "repo",
			"retrieve the archive from remote repository <repo>"),
		OPT_STRING(0, "exec", &exec, "cmd",
			"path to the remote git-upload-archive command"),
		OPT_END()
	};

	argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);

	if (remote)
		die("Unexpected option --remote");
	if (exec)
		die("Option --exec can only be used together with --remote");
	if (output)
		die("Unexpected option --output");

	if (!base)
		base = "";

	if (list) {
		for (i = 0; i < ARRAY_SIZE(archivers); i++)
			printf("%s\n", archivers[i].name);
		exit(0);
	}

	/* We need at least one parameter -- tree-ish */
	if (argc < 1)
		usage_with_options(archive_usage, opts);
	*ar = lookup_archiver(format);
	if (!*ar)
		die("Unknown archive format '%s'", format);

	args->compression_level = Z_DEFAULT_COMPRESSION;
	if (compression_level != -1) {
		if ((*ar)->flags & USES_ZLIB_COMPRESSION)
			args->compression_level = compression_level;
		else {
			die("Argument not supported for format '%s': -%d",
					format, compression_level);
		}
	}
	args->verbose = verbose;
	args->base = base;
	args->baselen = strlen(base);
	args->worktree_attributes = worktree_attributes;

	return argc;
}

int write_archive(int argc, const char **argv, const char *prefix,
		int setup_prefix)
{
	const struct archiver *ar = NULL;
	struct archiver_args args;

	argc = parse_archive_args(argc, argv, &ar, &args);
	if (setup_prefix && prefix == NULL)
		prefix = setup_git_directory();

	parse_treeish_arg(argv, &args, prefix);
	parse_pathspec_arg(argv + 1, &args);

	git_config(git_default_config, NULL);

	return ar->write_archive(&args);
}
Commit	Line	Data
18125644 LH	1	#include "cache.h"
18125644 LH	2	#include "commit.h"
c0885435	3	#include "tree-walk.h"
18125644	4	#include "attr.h"
562e25ab	5	#include "archive.h"
4fac1d3a	6	#include "parse-options.h"
ba053ea9	7	#include "unpack-trees.h"
4fac1d3a RS	8
	9	static char const * const archive_usage[] = {
	10	"git archive [options] <tree-ish> [path...]",
	11	"git archive --list",
	12	"git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [path...]",
	13	"git archive --remote <repo> [--exec <cmd>] --list",
	14	NULL
	15	};
c0885435 RS	16
	17	#define USES_ZLIB_COMPRESSION 1
	18
120a385a	19	static const struct archiver {
f15f736d RS	20	const char *name;
	21	write_archive_fn_t write_archive;
	22	unsigned int flags;
	23	} archivers[] = {
c0885435 RS	24	{ "tar", write_tar_archive },
	25	{ "zip", write_zip_archive, USES_ZLIB_COMPRESSION },
	26	};
	27
18125644 LH	28	static void format_subst(const struct commit *commit,
	29	const char *src, size_t len,
	30	struct strbuf *buf)
	31	{
	32	char *to_free = NULL;
f285a2d7	33	struct strbuf fmt = STRBUF_INIT;
18125644 LH	34
	35	if (src == buf->buf)
	36	to_free = strbuf_detach(buf, NULL);
18125644 LH	37	for (;;) {
	38	const char b, c;
	39
	40	b = memmem(src, len, "$Format:", 8);
75b7dfbd	41	if (!b)
18125644	42	break;
75b7dfbd	43	c = memchr(b + 8, '$', (src + len) - b - 8);
18125644 LH	44	if (!c)
	45	break;
	46
	47	strbuf_reset(&fmt);
	48	strbuf_add(&fmt, b + 8, c - b - 8);
	49
	50	strbuf_add(buf, src, b - src);
d36f8679	51	format_commit_message(commit, fmt.buf, buf, DATE_NORMAL);
18125644 LH	52	len -= c + 1 - src;
	53	src = c + 1;
	54	}
	55	strbuf_add(buf, src, len);
	56	strbuf_release(&fmt);
	57	free(to_free);
	58	}
	59
1d11d5bb RS	60	static void sha1_file_to_archive(const char path, const unsigned char *sha1,
	61	unsigned int mode, enum object_type *type,
	62	unsigned long sizep, const struct commit commit)
18125644 LH	63	{
	64	void *buffer;
	65
	66	buffer = read_sha1_file(sha1, type, sizep);
	67	if (buffer && S_ISREG(mode)) {
f285a2d7	68	struct strbuf buf = STRBUF_INIT;
18125644 LH	69	size_t size = 0;
18125644 LH	70
18125644 LH	71	strbuf_attach(&buf, buffer, sizep, sizep + 1);
18125644 LH	72	convert_to_working_tree(path, buf.buf, buf.len, &buf);
1d11d5bb RS	73	if (commit)
1d11d5bb RS	74	format_subst(commit, buf.buf, buf.len, &buf);
18125644 LH	75	buffer = strbuf_detach(&buf, &size);
	76	*sizep = size;
	77	}
	78
	79	return buffer;
	80	}
	81
1d11d5bb	82	static void setup_archive_check(struct git_attr_check *check)
008d896d RS	83	{
008d896d RS	84	static struct git_attr *attr_export_ignore;
1d11d5bb	85	static struct git_attr *attr_export_subst;
008d896d	86
1d11d5bb	87	if (!attr_export_ignore) {
008d896d	88	attr_export_ignore = git_attr("export-ignore", 13);
1d11d5bb RS	89	attr_export_subst = git_attr("export-subst", 12);
1d11d5bb RS	90	}
008d896d	91	check[0].attr = attr_export_ignore;
1d11d5bb	92	check[1].attr = attr_export_subst;
008d896d	93	}
562e25ab RS	94
	95	struct archiver_context {
	96	struct archiver_args *args;
	97	write_archive_entry_fn_t write_entry;
	98	};
	99
	100	static int write_archive_entry(const unsigned char sha1, const char base,
	101	int baselen, const char *filename, unsigned mode, int stage,
	102	void *context)
	103	{
	104	static struct strbuf path = STRBUF_INIT;
	105	struct archiver_context *c = context;
	106	struct archiver_args *args = c->args;
	107	write_archive_entry_fn_t write_entry = c->write_entry;
1d11d5bb RS	108	struct git_attr_check check[2];
	109	const char *path_without_prefix;
	110	int convert = 0;
562e25ab RS	111	int err;
	112	enum object_type type;
	113	unsigned long size;
	114	void *buffer;
	115
	116	strbuf_reset(&path);
	117	strbuf_grow(&path, PATH_MAX);
	118	strbuf_add(&path, base, baselen);
	119	strbuf_addstr(&path, filename);
1d11d5bb	120	path_without_prefix = path.buf + args->baselen;
562e25ab	121
1d11d5bb RS	122	setup_archive_check(check);
	123	if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
	124	if (ATTR_TRUE(check[0].value))
	125	return 0;
	126	convert = ATTR_TRUE(check[1].value);
	127	}
562e25ab RS	128
	129	if (S_ISDIR(mode) \|\| S_ISGITLINK(mode)) {
	130	strbuf_addch(&path, '/');
	131	if (args->verbose)
	132	fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
	133	err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
	134	if (err)
	135	return err;
d3bee161	136	return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
562e25ab RS	137	}
562e25ab RS	138
1d11d5bb RS	139	buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
1d11d5bb RS	140	&type, &size, convert ? args->commit : NULL);
562e25ab RS	141	if (!buffer)
	142	return error("cannot read %s", sha1_to_hex(sha1));
	143	if (args->verbose)
	144	fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
	145	err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
	146	free(buffer);
	147	return err;
	148	}
	149
	150	int write_archive_entries(struct archiver_args *args,
	151	write_archive_entry_fn_t write_entry)
	152	{
	153	struct archiver_context context;
ba053ea9 NTND	154	struct unpack_trees_options opts;
ba053ea9 NTND	155	struct tree_desc t;
562e25ab RS	156	int err;
	157
	158	if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
	159	size_t len = args->baselen;
	160
	161	while (len > 1 && args->base[len - 2] == '/')
	162	len--;
	163	if (args->verbose)
	164	fprintf(stderr, "%.*s\n", (int)len, args->base);
	165	err = write_entry(args, args->tree->object.sha1, args->base,
	166	len, 040777, NULL, 0);
	167	if (err)
	168	return err;
	169	}
	170
	171	context.args = args;
	172	context.write_entry = write_entry;
	173
ba053ea9 NTND	174	/*
	175	* Setup index and instruct attr to read index only
	176	*/
	177	if (!args->worktree_attributes) {
	178	memset(&opts, 0, sizeof(opts));
	179	opts.index_only = 1;
	180	opts.head_idx = -1;
	181	opts.src_index = &the_index;
	182	opts.dst_index = &the_index;
	183	opts.fn = oneway_merge;
	184	init_tree_desc(&t, args->tree->buffer, args->tree->size);
	185	if (unpack_trees(1, &t, &opts))
	186	return -1;
	187	git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
	188	}
	189
562e25ab RS	190	err = read_tree_recursive(args->tree, args->base, args->baselen, 0,
	191	args->pathspec, write_archive_entry, &context);
	192	if (err == READ_TREE_RECURSIVE)
	193	err = 0;
	194	return err;
	195	}
6e94e683	196
c0885435 RS	197	static const struct archiver lookup_archiver(const char name)
	198	{
	199	int i;
	200
4fac1d3a RS	201	if (!name)
	202	return NULL;
	203
c0885435 RS	204	for (i = 0; i < ARRAY_SIZE(archivers); i++) {
	205	if (!strcmp(name, archivers[i].name))
	206	return &archivers[i];
	207	}
	208	return NULL;
	209	}
	210
	211	static void parse_pathspec_arg(const char **pathspec,
	212	struct archiver_args *ar_args)
	213	{
	214	ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
	215	}
	216
	217	static void parse_treeish_arg(const char **argv,
	218	struct archiver_args ar_args, const char prefix)
	219	{
	220	const char *name = argv[0];
	221	const unsigned char *commit_sha1;
	222	time_t archive_time;
	223	struct tree *tree;
	224	const struct commit *commit;
	225	unsigned char sha1[20];
	226
	227	if (get_sha1(name, sha1))
	228	die("Not a valid object name");
	229
	230	commit = lookup_commit_reference_gently(sha1, 1);
	231	if (commit) {
	232	commit_sha1 = commit->object.sha1;
	233	archive_time = commit->date;
	234	} else {
	235	commit_sha1 = NULL;
	236	archive_time = time(NULL);
	237	}
	238
	239	tree = parse_tree_indirect(sha1);
	240	if (tree == NULL)
	241	die("not a tree object");
	242
	243	if (prefix) {
	244	unsigned char tree_sha1[20];
	245	unsigned int mode;
	246	int err;
	247
	248	err = get_tree_entry(tree->object.sha1, prefix,
	249	tree_sha1, &mode);
	250	if (err \|\| !S_ISDIR(mode))
	251	die("current working directory is untracked");
	252
	253	tree = parse_tree_indirect(tree_sha1);
	254	}
	255	ar_args->tree = tree;
	256	ar_args->commit_sha1 = commit_sha1;
	257	ar_args->commit = commit;
	258	ar_args->time = archive_time;
	259	}
	260
4fac1d3a RS	261	#define OPT__COMPR(s, v, h, p) \
	262	{ OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
	263	PARSE_OPT_NOARG \| PARSE_OPT_NONEG, NULL, (p) }
	264	#define OPT__COMPR_HIDDEN(s, v, p) \
	265	{ OPTION_SET_INT, (s), NULL, (v), NULL, "", \
	266	PARSE_OPT_NOARG \| PARSE_OPT_NONEG \| PARSE_OPT_HIDDEN, NULL, (p) }
	267
c0885435 RS	268	static int parse_archive_args(int argc, const char **argv,
	269	const struct archiver *ar, struct archiver_args args)
	270	{
	271	const char *format = "tar";
4fac1d3a RS	272	const char *base = NULL;
	273	const char *remote = NULL;
	274	const char *exec = NULL;
aec0c1bb	275	const char *output = NULL;
c0885435 RS	276	int compression_level = -1;
	277	int verbose = 0;
	278	int i;
4fac1d3a	279	int list = 0;
ba053ea9	280	int worktree_attributes = 0;
4fac1d3a RS	281	struct option opts[] = {
	282	OPT_GROUP(""),
	283	OPT_STRING(0, "format", &format, "fmt", "archive format"),
	284	OPT_STRING(0, "prefix", &base, "prefix",
	285	"prepend prefix to each pathname in the archive"),
aec0c1bb CMDV	286	OPT_STRING(0, "output", &output, "file",
aec0c1bb CMDV	287	"write the archive to this file"),
ba053ea9 NTND	288	OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
ba053ea9 NTND	289	"read .gitattributes in working directory"),
4fac1d3a RS	290	OPT__VERBOSE(&verbose),
	291	OPT__COMPR('0', &compression_level, "store only", 0),
	292	OPT__COMPR('1', &compression_level, "compress faster", 1),
	293	OPT__COMPR_HIDDEN('2', &compression_level, 2),
	294	OPT__COMPR_HIDDEN('3', &compression_level, 3),
	295	OPT__COMPR_HIDDEN('4', &compression_level, 4),
	296	OPT__COMPR_HIDDEN('5', &compression_level, 5),
	297	OPT__COMPR_HIDDEN('6', &compression_level, 6),
	298	OPT__COMPR_HIDDEN('7', &compression_level, 7),
	299	OPT__COMPR_HIDDEN('8', &compression_level, 8),
	300	OPT__COMPR('9', &compression_level, "compress better", 9),
	301	OPT_GROUP(""),
	302	OPT_BOOLEAN('l', "list", &list,
	303	"list supported archive formats"),
	304	OPT_GROUP(""),
	305	OPT_STRING(0, "remote", &remote, "repo",
	306	"retrieve the archive from remote repository <repo>"),
	307	OPT_STRING(0, "exec", &exec, "cmd",
	308	"path to the remote git-upload-archive command"),
	309	OPT_END()
	310	};
	311
37782920	312	argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
4fac1d3a RS	313
	314	if (remote)
	315	die("Unexpected option --remote");
	316	if (exec)
	317	die("Option --exec can only be used together with --remote");
52e77876 RS	318	if (output)
52e77876 RS	319	die("Unexpected option --output");
4fac1d3a RS	320
	321	if (!base)
	322	base = "";
	323
	324	if (list) {
	325	for (i = 0; i < ARRAY_SIZE(archivers); i++)
	326	printf("%s\n", archivers[i].name);
	327	exit(0);
c0885435 RS	328	}
	329
	330	/* We need at least one parameter -- tree-ish */
4fac1d3a RS	331	if (argc < 1)
4fac1d3a RS	332	usage_with_options(archive_usage, opts);
c0885435 RS	333	*ar = lookup_archiver(format);
	334	if (!*ar)
	335	die("Unknown archive format '%s'", format);
	336
	337	args->compression_level = Z_DEFAULT_COMPRESSION;
	338	if (compression_level != -1) {
	339	if ((*ar)->flags & USES_ZLIB_COMPRESSION)
	340	args->compression_level = compression_level;
	341	else {
	342	die("Argument not supported for format '%s': -%d",
	343	format, compression_level);
	344	}
	345	}
	346	args->verbose = verbose;
	347	args->base = base;
	348	args->baselen = strlen(base);
ba053ea9	349	args->worktree_attributes = worktree_attributes;
c0885435	350
4fac1d3a	351	return argc;
c0885435 RS	352	}
c0885435 RS	353
6e94e683 RS	354	int write_archive(int argc, const char *argv, const char prefix,
	355	int setup_prefix)
	356	{
	357	const struct archiver *ar = NULL;
	358	struct archiver_args args;
6e94e683	359
4fac1d3a	360	argc = parse_archive_args(argc, argv, &ar, &args);
6e94e683 RS	361	if (setup_prefix && prefix == NULL)
	362	prefix = setup_git_directory();
	363
6e94e683 RS	364	parse_treeish_arg(argv, &args, prefix);
	365	parse_pathspec_arg(argv + 1, &args);
	366
ddff8563 CB	367	git_config(git_default_config, NULL);
ddff8563 CB	368
6e94e683 RS	369	return ar->write_archive(&args);
6e94e683 RS	370	}