builtin-archive.c - jrn/git - Git at Google

 /*
  * Copyright (c) 2006 Franck Bui-Huu
  * Copyright (c) 2006 Rene Scharfe
  */
 #include "cache.h"
 #include "builtin.h"
 #include "archive.h"
 #include "commit.h"
 #include "tree-walk.h"
 #include "exec_cmd.h"
 #include "pkt-line.h"
 #include "sideband.h"
 #include "attr.h"

 static const char archive_usage[] = \
 "git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";

 static struct archiver_desc
 {
 	const char *name;
 	write_archive_fn_t write_archive;
 	parse_extra_args_fn_t parse_extra;
 } archivers[] = {
 	{ "tar", write_tar_archive, NULL },
 	{ "zip", write_zip_archive, parse_extra_zip_args },
 };

 static int run_remote_archiver(const char *remote, int argc,
 			       const char **argv)
 {
 	char *url, buf[LARGE_PACKET_MAX];
 	int fd[2], i, len, rv;
 	struct child_process *conn;
 	const char *exec = "git-upload-archive";
 	int exec_at = 0;

 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
 		if (!prefixcmp(arg, "--exec=")) {
 			if (exec_at)
 				die("multiple --exec specified");
 			exec = arg + 7;
 			exec_at = i;
 			break;
 		}
 	}

 	url = xstrdup(remote);
 	conn = git_connect(fd, url, exec, 0);

 	for (i = 1; i < argc; i++) {
 		if (i == exec_at)
 			continue;
 		packet_write(fd[1], "argument %s\n", argv[i]);
 	}
 	packet_flush(fd[1]);

 	len = packet_read_line(fd[0], buf, sizeof(buf));
 	if (!len)
 		die("git-archive: expected ACK/NAK, got EOF");
 	if (buf[len-1] == '\n')
 		buf[--len] = 0;
 	if (strcmp(buf, "ACK")) {
 		if (len > 5 && !prefixcmp(buf, "NACK "))
 			die("git-archive: NACK %s", buf + 5);
 		die("git-archive: protocol error");
 	}

 	len = packet_read_line(fd[0], buf, sizeof(buf));
 	if (len)
 		die("git-archive: expected a flush");

 	/* Now, start reading from fd[0] and spit it out to stdout */
 	rv = recv_sideband("archive", fd[0], 1, 2);
 	close(fd[0]);
 	close(fd[1]);
 	rv |= finish_connect(conn);

 	return !!rv;
 }

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

 	if (src == buf->buf)
 		to_free = strbuf_detach(buf, NULL);
 	strbuf_init(&fmt, 0);
 	for (;;) {
 		const char *b, *c;

 		b = memmem(src, len, "$Format:", 8);
 		if (!b || src + len < b + 9)
 			break;
 		c = memchr(b + 8, '$', len - 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);
 		len -= c + 1 - src;
 		src  = c + 1;
 	}
 	strbuf_add(buf, src, len);
 	strbuf_release(&fmt);
 	free(to_free);
 }

 static int convert_to_archive(const char *path,
                               const void *src, size_t len,
                               struct strbuf *buf,
                               const struct commit *commit)
 {
 	static struct git_attr *attr_export_subst;
 	struct git_attr_check check[1];

 	if (!commit)
 		return 0;

 	if (!attr_export_subst)
 		attr_export_subst = git_attr("export-subst", 12);

 	check[0].attr = attr_export_subst;
 	if (git_checkattr(path, ARRAY_SIZE(check), check))
 		return 0;
 	if (!ATTR_TRUE(check[0].value))
 		return 0;

 	format_subst(commit, src, len, buf);
 	return 1;
 }

 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;
 		size_t size = 0;

 		strbuf_init(&buf, 0);
 		strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
 		convert_to_working_tree(path, buf.buf, buf.len, &buf);
 		convert_to_archive(path, buf.buf, buf.len, &buf, commit);
 		buffer = strbuf_detach(&buf, &size);
 		*sizep = size;
 	}

 	return buffer;
 }

 static int init_archiver(const char *name, struct archiver *ar)
 {
 	int rv = -1, i;

 	for (i = 0; i < ARRAY_SIZE(archivers); i++) {
 		if (!strcmp(name, archivers[i].name)) {
 			memset(ar, 0, sizeof(*ar));
 			ar->name = archivers[i].name;
 			ar->write_archive = archivers[i].write_archive;
 			ar->parse_extra = archivers[i].parse_extra;
 			rv = 0;
 			break;
 		}
 	}
 	return rv;
 }

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

 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;
 }

 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 {
 	const char *extra_argv[MAX_EXTRA_ARGS];
 	int extra_argc = 0;
 	const char *format = "tar";
 	const char *base = "";
 	int verbose = 0;
 	int i;

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

 		if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
 			for (i = 0; i < ARRAY_SIZE(archivers); i++)
 				printf("%s\n", archivers[i].name);
 			exit(0);
 		}
 		if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 			verbose = 1;
 			continue;
 		}
 		if (!prefixcmp(arg, "--format=")) {
 			format = arg + 9;
 			continue;
 		}
 		if (!prefixcmp(arg, "--prefix=")) {
 			base = arg + 9;
 			continue;
 		}
 		if (!strcmp(arg, "--")) {
 			i++;
 			break;
 		}
 		if (arg[0] == '-') {
 			if (extra_argc > MAX_EXTRA_ARGS - 1)
 				die("Too many extra options");
 			extra_argv[extra_argc++] = arg;
 			continue;
 		}
 		break;
 	}

 	/* We need at least one parameter -- tree-ish */
 	if (argc - 1 < i)
 		usage(archive_usage);
 	if (init_archiver(format, ar) < 0)
 		die("Unknown archive format '%s'", format);

 	if (extra_argc) {
 		if (!ar->parse_extra)
 			die("'%s' format does not handle %s",
 			    ar->name, extra_argv[0]);
 		ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
 	}
 	ar->args.verbose = verbose;
 	ar->args.base = base;

 	return i;
 }

 static const char *extract_remote_arg(int *ac, const char **av)
 {
 	int ix, iy, cnt = *ac;
 	int no_more_options = 0;
 	const char *remote = NULL;

 	for (ix = iy = 1; ix < cnt; ix++) {
 		const char *arg = av[ix];
 		if (!strcmp(arg, "--"))
 			no_more_options = 1;
 		if (!no_more_options) {
 			if (!prefixcmp(arg, "--remote=")) {
 				if (remote)
 					die("Multiple --remote specified");
 				remote = arg + 9;
 				continue;
 			}
 			if (arg[0] != '-')
 				no_more_options = 1;
 		}
 		if (ix != iy)
 			av[iy] = arg;
 		iy++;
 	}
 	if (remote) {
 		av[--cnt] = NULL;
 		*ac = cnt;
 	}
 	return remote;
 }

 int cmd_archive(int argc, const char **argv, const char *prefix)
 {
 	struct archiver ar;
 	int tree_idx;
 	const char *remote = NULL;

 	remote = extract_remote_arg(&argc, argv);
 	if (remote)
 		return run_remote_archiver(remote, argc, argv);

 	setvbuf(stderr, NULL, _IOLBF, BUFSIZ);

 	memset(&ar, 0, sizeof(ar));
 	tree_idx = parse_archive_args(argc, argv, &ar);
 	if (prefix == NULL)
 		prefix = setup_git_directory();

 	argv += tree_idx;
 	parse_treeish_arg(argv, &ar.args, prefix);
 	parse_pathspec_arg(argv + 1, &ar.args);

 	return ar.write_archive(&ar.args);
 }
	/*
	* Copyright (c) 2006 Franck Bui-Huu
	* Copyright (c) 2006 Rene Scharfe
	*/
	#include "cache.h"
	#include "builtin.h"
	#include "archive.h"
	#include "commit.h"
	#include "tree-walk.h"
	#include "exec_cmd.h"
	#include "pkt-line.h"
	#include "sideband.h"
	#include "attr.h"

	static const char archive_usage[] = \
	"git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";

	static struct archiver_desc
	{
	const char *name;
	write_archive_fn_t write_archive;
	parse_extra_args_fn_t parse_extra;
	} archivers[] = {
	{ "tar", write_tar_archive, NULL },
	{ "zip", write_zip_archive, parse_extra_zip_args },
	};

	static int run_remote_archiver(const char *remote, int argc,
	const char **argv)
	{
	char *url, buf[LARGE_PACKET_MAX];
	int fd[2], i, len, rv;
	struct child_process *conn;
	const char *exec = "git-upload-archive";
	int exec_at = 0;

	for (i = 1; i < argc; i++) {
	const char *arg = argv[i];
	if (!prefixcmp(arg, "--exec=")) {
	if (exec_at)
	die("multiple --exec specified");
	exec = arg + 7;
	exec_at = i;
	break;
	}
	}

	url = xstrdup(remote);
	conn = git_connect(fd, url, exec, 0);

	for (i = 1; i < argc; i++) {
	if (i == exec_at)
	continue;
	packet_write(fd[1], "argument %s\n", argv[i]);
	}
	packet_flush(fd[1]);

	len = packet_read_line(fd[0], buf, sizeof(buf));
	if (!len)
	die("git-archive: expected ACK/NAK, got EOF");
	if (buf[len-1] == '\n')
	buf[--len] = 0;
	if (strcmp(buf, "ACK")) {
	if (len > 5 && !prefixcmp(buf, "NACK "))
	die("git-archive: NACK %s", buf + 5);
	die("git-archive: protocol error");
	}

	len = packet_read_line(fd[0], buf, sizeof(buf));
	if (len)
	die("git-archive: expected a flush");

	/* Now, start reading from fd[0] and spit it out to stdout */
	rv = recv_sideband("archive", fd[0], 1, 2);
	close(fd[0]);
	close(fd[1]);
	rv \|= finish_connect(conn);

	return !!rv;
	}

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

	if (src == buf->buf)
	to_free = strbuf_detach(buf, NULL);
	strbuf_init(&fmt, 0);
	for (;;) {
	const char b, c;

	b = memmem(src, len, "$Format:", 8);
	if (!b \|\| src + len < b + 9)
	break;
	c = memchr(b + 8, '$', len - 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);
	len -= c + 1 - src;
	src = c + 1;
	}
	strbuf_add(buf, src, len);
	strbuf_release(&fmt);
	free(to_free);
	}

	static int convert_to_archive(const char *path,
	const void *src, size_t len,
	struct strbuf *buf,
	const struct commit *commit)
	{
	static struct git_attr *attr_export_subst;
	struct git_attr_check check[1];

	if (!commit)
	return 0;

	if (!attr_export_subst)
	attr_export_subst = git_attr("export-subst", 12);

	check[0].attr = attr_export_subst;
	if (git_checkattr(path, ARRAY_SIZE(check), check))
	return 0;
	if (!ATTR_TRUE(check[0].value))
	return 0;

	format_subst(commit, src, len, buf);
	return 1;
	}

	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;
	size_t size = 0;

	strbuf_init(&buf, 0);
	strbuf_attach(&buf, buffer, sizep, sizep + 1);
	convert_to_working_tree(path, buf.buf, buf.len, &buf);
	convert_to_archive(path, buf.buf, buf.len, &buf, commit);
	buffer = strbuf_detach(&buf, &size);
	*sizep = size;
	}

	return buffer;
	}

	static int init_archiver(const char name, struct archiver ar)
	{
	int rv = -1, i;

	for (i = 0; i < ARRAY_SIZE(archivers); i++) {
	if (!strcmp(name, archivers[i].name)) {
	memset(ar, 0, sizeof(*ar));
	ar->name = archivers[i].name;
	ar->write_archive = archivers[i].write_archive;
	ar->parse_extra = archivers[i].parse_extra;
	rv = 0;
	break;
	}
	}
	return rv;
	}

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

	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;
	}

	int parse_archive_args(int argc, const char *argv, struct archiver ar)
	{
	const char *extra_argv[MAX_EXTRA_ARGS];
	int extra_argc = 0;
	const char *format = "tar";
	const char *base = "";
	int verbose = 0;
	int i;

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

	if (!strcmp(arg, "--list") \|\| !strcmp(arg, "-l")) {
	for (i = 0; i < ARRAY_SIZE(archivers); i++)
	printf("%s\n", archivers[i].name);
	exit(0);
	}
	if (!strcmp(arg, "--verbose") \|\| !strcmp(arg, "-v")) {
	verbose = 1;
	continue;
	}
	if (!prefixcmp(arg, "--format=")) {
	format = arg + 9;
	continue;
	}
	if (!prefixcmp(arg, "--prefix=")) {
	base = arg + 9;
	continue;
	}
	if (!strcmp(arg, "--")) {
	i++;
	break;
	}
	if (arg[0] == '-') {
	if (extra_argc > MAX_EXTRA_ARGS - 1)
	die("Too many extra options");
	extra_argv[extra_argc++] = arg;
	continue;
	}
	break;
	}

	/* We need at least one parameter -- tree-ish */
	if (argc - 1 < i)
	usage(archive_usage);
	if (init_archiver(format, ar) < 0)
	die("Unknown archive format '%s'", format);

	if (extra_argc) {
	if (!ar->parse_extra)
	die("'%s' format does not handle %s",
	ar->name, extra_argv[0]);
	ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
	}
	ar->args.verbose = verbose;
	ar->args.base = base;

	return i;
	}

	static const char extract_remote_arg(int ac, const char **av)
	{
	int ix, iy, cnt = *ac;
	int no_more_options = 0;
	const char *remote = NULL;

	for (ix = iy = 1; ix < cnt; ix++) {
	const char *arg = av[ix];
	if (!strcmp(arg, "--"))
	no_more_options = 1;
	if (!no_more_options) {
	if (!prefixcmp(arg, "--remote=")) {
	if (remote)
	die("Multiple --remote specified");
	remote = arg + 9;
	continue;
	}
	if (arg[0] != '-')
	no_more_options = 1;
	}
	if (ix != iy)
	av[iy] = arg;
	iy++;
	}
	if (remote) {
	av[--cnt] = NULL;
	*ac = cnt;
	}
	return remote;
	}

	int cmd_archive(int argc, const char *argv, const char prefix)
	{
	struct archiver ar;
	int tree_idx;
	const char *remote = NULL;

	remote = extract_remote_arg(&argc, argv);
	if (remote)
	return run_remote_archiver(remote, argc, argv);

	setvbuf(stderr, NULL, _IOLBF, BUFSIZ);

	memset(&ar, 0, sizeof(ar));
	tree_idx = parse_archive_args(argc, argv, &ar);
	if (prefix == NULL)
	prefix = setup_git_directory();

	argv += tree_idx;
	parse_treeish_arg(argv, &ar.args, prefix);
	parse_pathspec_arg(argv + 1, &ar.args);

	return ar.write_archive(&ar.args);
	}