[thirdparty/git.git] / builtin / repack.c

#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "dir.h"
#include "parse-options.h"
#include "run-command.h"
#include "sigchain.h"
#include "strbuf.h"
#include "string-list.h"
#include "argv-array.h"
#include "packfile.h"
#include "object-store.h"

static int delta_base_offset = 1;
static int pack_kept_objects = -1;
static int write_bitmaps;
static char *packdir, *packtmp;

static const char *const git_repack_usage[] = {
	N_("git repack [<options>]"),
	NULL
};

static const char incremental_bitmap_conflict_error[] = N_(
"Incremental repacks are incompatible with bitmap indexes.  Use\n"
"--no-write-bitmap-index or disable the pack.writebitmaps configuration."
);


static int repack_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "repack.usedeltabaseoffset")) {
		delta_base_offset = git_config_bool(var, value);
		return 0;
	}
	if (!strcmp(var, "repack.packkeptobjects")) {
		pack_kept_objects = git_config_bool(var, value);
		return 0;
	}
	if (!strcmp(var, "repack.writebitmaps") ||
	    !strcmp(var, "pack.writebitmaps")) {
		write_bitmaps = git_config_bool(var, value);
		return 0;
	}
	return git_default_config(var, value, cb);
}

/*
 * Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
 */
static void remove_temporary_files(void)
{
	struct strbuf buf = STRBUF_INIT;
	size_t dirlen, prefixlen;
	DIR *dir;
	struct dirent *e;

	dir = opendir(packdir);
	if (!dir)
		return;

	/* Point at the slash at the end of ".../objects/pack/" */
	dirlen = strlen(packdir) + 1;
	strbuf_addstr(&buf, packtmp);
	/* Hold the length of  ".tmp-%d-pack-" */
	prefixlen = buf.len - dirlen;

	while ((e = readdir(dir))) {
		if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
			continue;
		strbuf_setlen(&buf, dirlen);
		strbuf_addstr(&buf, e->d_name);
		unlink(buf.buf);
	}
	closedir(dir);
	strbuf_release(&buf);
}

static void remove_pack_on_signal(int signo)
{
	remove_temporary_files();
	sigchain_pop(signo);
	raise(signo);
}

/*
 * Adds all packs hex strings to the fname list, which do not
 * have a corresponding .keep file. These packs are not to
 * be kept if we are going to pack everything into one file.
 */
static void get_non_kept_pack_filenames(struct string_list *fname_list,
					const struct string_list *extra_keep)
{
	DIR *dir;
	struct dirent *e;
	char *fname;

	if (!(dir = opendir(packdir)))
		return;

	while ((e = readdir(dir)) != NULL) {
		size_t len;
		int i;

		for (i = 0; i < extra_keep->nr; i++)
			if (!fspathcmp(e->d_name, extra_keep->items[i].string))
				break;
		if (extra_keep->nr > 0 && i < extra_keep->nr)
			continue;

		if (!strip_suffix(e->d_name, ".pack", &len))
			continue;

		fname = xmemdupz(e->d_name, len);

		if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
			string_list_append_nodup(fname_list, fname);
		else
			free(fname);
	}
	closedir(dir);
}

static void remove_redundant_pack(const char *dir_name, const char *base_name)
{
	const char *exts[] = {".pack", ".idx", ".keep", ".bitmap", ".promisor"};
	int i;
	struct strbuf buf = STRBUF_INIT;
	size_t plen;

	strbuf_addf(&buf, "%s/%s", dir_name, base_name);
	plen = buf.len;

	for (i = 0; i < ARRAY_SIZE(exts); i++) {
		strbuf_setlen(&buf, plen);
		strbuf_addstr(&buf, exts[i]);
		unlink(buf.buf);
	}
	strbuf_release(&buf);
}

struct pack_objects_args {
	const char *window;
	const char *window_memory;
	const char *depth;
	const char *threads;
	const char *max_pack_size;
	int no_reuse_delta;
	int no_reuse_object;
	int quiet;
	int local;
};

static void prepare_pack_objects(struct child_process *cmd,
				 const struct pack_objects_args *args)
{
	argv_array_push(&cmd->args, "pack-objects");
	if (args->window)
		argv_array_pushf(&cmd->args, "--window=%s", args->window);
	if (args->window_memory)
		argv_array_pushf(&cmd->args, "--window-memory=%s", args->window_memory);
	if (args->depth)
		argv_array_pushf(&cmd->args, "--depth=%s", args->depth);
	if (args->threads)
		argv_array_pushf(&cmd->args, "--threads=%s", args->threads);
	if (args->max_pack_size)
		argv_array_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size);
	if (args->no_reuse_delta)
		argv_array_pushf(&cmd->args, "--no-reuse-delta");
	if (args->no_reuse_object)
		argv_array_pushf(&cmd->args, "--no-reuse-object");
	if (args->local)
		argv_array_push(&cmd->args,  "--local");
	if (args->quiet)
		argv_array_push(&cmd->args,  "--quiet");
	if (delta_base_offset)
		argv_array_push(&cmd->args,  "--delta-base-offset");
	argv_array_push(&cmd->args, packtmp);
	cmd->git_cmd = 1;
	cmd->out = -1;
}

/*
 * Write oid to the given struct child_process's stdin, starting it first if
 * necessary.
 */
static int write_oid(const struct object_id *oid, struct packed_git *pack,
		     uint32_t pos, void *data)
{
	struct child_process *cmd = data;

	if (cmd->in == -1) {
		if (start_command(cmd))
			die("Could not start pack-objects to repack promisor objects");
	}

	xwrite(cmd->in, oid_to_hex(oid), GIT_SHA1_HEXSZ);
	xwrite(cmd->in, "\n", 1);
	return 0;
}

static void repack_promisor_objects(const struct pack_objects_args *args,
				    struct string_list *names)
{
	struct child_process cmd = CHILD_PROCESS_INIT;
	FILE *out;
	struct strbuf line = STRBUF_INIT;

	prepare_pack_objects(&cmd, args);
	cmd.in = -1;

	/*
	 * NEEDSWORK: Giving pack-objects only the OIDs without any ordering
	 * hints may result in suboptimal deltas in the resulting pack. See if
	 * the OIDs can be sent with fake paths such that pack-objects can use a
	 * {type -> existing pack order} ordering when computing deltas instead
	 * of a {type -> size} ordering, which may produce better deltas.
	 */
	for_each_packed_object(write_oid, &cmd,
			       FOR_EACH_OBJECT_PROMISOR_ONLY);

	if (cmd.in == -1)
		/* No packed objects; cmd was never started */
		return;

	close(cmd.in);

	out = xfdopen(cmd.out, "r");
	while (strbuf_getline_lf(&line, out) != EOF) {
		char *promisor_name;
		int fd;
		if (line.len != 40)
			die("repack: Expecting 40 character sha1 lines only from pack-objects.");
		string_list_append(names, line.buf);

		/*
		 * pack-objects creates the .pack and .idx files, but not the
		 * .promisor file. Create the .promisor file, which is empty.
		 */
		promisor_name = mkpathdup("%s-%s.promisor", packtmp,
					  line.buf);
		fd = open(promisor_name, O_CREAT|O_EXCL|O_WRONLY, 0600);
		if (fd < 0)
			die_errno("unable to create '%s'", promisor_name);
		close(fd);
		free(promisor_name);
	}
	fclose(out);
	if (finish_command(&cmd))
		die("Could not finish pack-objects to repack promisor objects");
}

#define ALL_INTO_ONE 1
#define LOOSEN_UNREACHABLE 2

int cmd_repack(int argc, const char **argv, const char *prefix)
{
	struct {
		const char *name;
		unsigned optional:1;
	} exts[] = {
		{".pack"},
		{".idx"},
		{".bitmap", 1},
		{".promisor", 1},
	};
	struct child_process cmd = CHILD_PROCESS_INIT;
	struct string_list_item *item;
	struct string_list names = STRING_LIST_INIT_DUP;
	struct string_list rollback = STRING_LIST_INIT_NODUP;
	struct string_list existing_packs = STRING_LIST_INIT_DUP;
	struct strbuf line = STRBUF_INIT;
	int i, ext, ret, failed;
	FILE *out;

	/* variables to be filled by option parsing */
	int pack_everything = 0;
	int delete_redundant = 0;
	const char *unpack_unreachable = NULL;
	int keep_unreachable = 0;
	struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
	int no_update_server_info = 0;
	struct pack_objects_args po_args = {NULL};

	struct option builtin_repack_options[] = {
		OPT_BIT('a', NULL, &pack_everything,
				N_("pack everything in a single pack"), ALL_INTO_ONE),
		OPT_BIT('A', NULL, &pack_everything,
				N_("same as -a, and turn unreachable objects loose"),
				   LOOSEN_UNREACHABLE | ALL_INTO_ONE),
		OPT_BOOL('d', NULL, &delete_redundant,
				N_("remove redundant packs, and run git-prune-packed")),
		OPT_BOOL('f', NULL, &po_args.no_reuse_delta,
				N_("pass --no-reuse-delta to git-pack-objects")),
		OPT_BOOL('F', NULL, &po_args.no_reuse_object,
				N_("pass --no-reuse-object to git-pack-objects")),
		OPT_BOOL('n', NULL, &no_update_server_info,
				N_("do not run git-update-server-info")),
		OPT__QUIET(&po_args.quiet, N_("be quiet")),
		OPT_BOOL('l', "local", &po_args.local,
				N_("pass --local to git-pack-objects")),
		OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
				N_("write bitmap index")),
		OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
				N_("with -A, do not loosen objects older than this")),
		OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
				N_("with -a, repack unreachable objects")),
		OPT_STRING(0, "window", &po_args.window, N_("n"),
				N_("size of the window used for delta compression")),
		OPT_STRING(0, "window-memory", &po_args.window_memory, N_("bytes"),
				N_("same as the above, but limit memory size instead of entries count")),
		OPT_STRING(0, "depth", &po_args.depth, N_("n"),
				N_("limits the maximum delta depth")),
		OPT_STRING(0, "threads", &po_args.threads, N_("n"),
				N_("limits the maximum number of threads")),
		OPT_STRING(0, "max-pack-size", &po_args.max_pack_size, N_("bytes"),
				N_("maximum size of each packfile")),
		OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
				N_("repack objects in packs marked with .keep")),
		OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
				N_("do not repack this pack")),
		OPT_END()
	};

	git_config(repack_config, NULL);

	argc = parse_options(argc, argv, prefix, builtin_repack_options,
				git_repack_usage, 0);

	if (delete_redundant && repository_format_precious_objects)
		die(_("cannot delete packs in a precious-objects repo"));

	if (keep_unreachable &&
	    (unpack_unreachable || (pack_everything & LOOSEN_UNREACHABLE)))
		die(_("--keep-unreachable and -A are incompatible"));

	if (pack_kept_objects < 0)
		pack_kept_objects = write_bitmaps;

	if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
		die(_(incremental_bitmap_conflict_error));

	packdir = mkpathdup("%s/pack", get_object_directory());
	packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());

	sigchain_push_common(remove_pack_on_signal);

	prepare_pack_objects(&cmd, &po_args);

	argv_array_push(&cmd.args, "--keep-true-parents");
	if (!pack_kept_objects)
		argv_array_push(&cmd.args, "--honor-pack-keep");
	for (i = 0; i < keep_pack_list.nr; i++)
		argv_array_pushf(&cmd.args, "--keep-pack=%s",
				 keep_pack_list.items[i].string);
	argv_array_push(&cmd.args, "--non-empty");
	argv_array_push(&cmd.args, "--all");
	argv_array_push(&cmd.args, "--reflog");
	argv_array_push(&cmd.args, "--indexed-objects");
	if (repository_format_partial_clone)
		argv_array_push(&cmd.args, "--exclude-promisor-objects");
	if (write_bitmaps)
		argv_array_push(&cmd.args, "--write-bitmap-index");

	if (pack_everything & ALL_INTO_ONE) {
		get_non_kept_pack_filenames(&existing_packs, &keep_pack_list);

		repack_promisor_objects(&po_args, &names);

		if (existing_packs.nr && delete_redundant) {
			if (unpack_unreachable) {
				argv_array_pushf(&cmd.args,
						"--unpack-unreachable=%s",
						unpack_unreachable);
				argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
			} else if (pack_everything & LOOSEN_UNREACHABLE) {
				argv_array_push(&cmd.args,
						"--unpack-unreachable");
			} else if (keep_unreachable) {
				argv_array_push(&cmd.args, "--keep-unreachable");
				argv_array_push(&cmd.args, "--pack-loose-unreachable");
			} else {
				argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
			}
		}
	} else {
		argv_array_push(&cmd.args, "--unpacked");
		argv_array_push(&cmd.args, "--incremental");
	}

	cmd.no_stdin = 1;

	ret = start_command(&cmd);
	if (ret)
		return ret;

	out = xfdopen(cmd.out, "r");
	while (strbuf_getline_lf(&line, out) != EOF) {
		if (line.len != 40)
			die("repack: Expecting 40 character sha1 lines only from pack-objects.");
		string_list_append(&names, line.buf);
	}
	fclose(out);
	ret = finish_command(&cmd);
	if (ret)
		return ret;

	if (!names.nr && !po_args.quiet)
		printf("Nothing new to pack.\n");

	/*
	 * Ok we have prepared all new packfiles.
	 * First see if there are packs of the same name and if so
	 * if we can move them out of the way (this can happen if we
	 * repacked immediately after packing fully.
	 */
	failed = 0;
	for_each_string_list_item(item, &names) {
		for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
			char *fname, *fname_old;
			fname = mkpathdup("%s/pack-%s%s", packdir,
						item->string, exts[ext].name);
			if (!file_exists(fname)) {
				free(fname);
				continue;
			}

			fname_old = mkpathdup("%s/old-%s%s", packdir,
						item->string, exts[ext].name);
			if (file_exists(fname_old))
				if (unlink(fname_old))
					failed = 1;

			if (!failed && rename(fname, fname_old)) {
				free(fname);
				free(fname_old);
				failed = 1;
				break;
			} else {
				string_list_append(&rollback, fname);
				free(fname_old);
			}
		}
		if (failed)
			break;
	}
	if (failed) {
		struct string_list rollback_failure = STRING_LIST_INIT_DUP;
		for_each_string_list_item(item, &rollback) {
			char *fname, *fname_old;
			fname = mkpathdup("%s/%s", packdir, item->string);
			fname_old = mkpathdup("%s/old-%s", packdir, item->string);
			if (rename(fname_old, fname))
				string_list_append(&rollback_failure, fname);
			free(fname);
			free(fname_old);
		}

		if (rollback_failure.nr) {
			int i;
			fprintf(stderr,
				"WARNING: Some packs in use have been renamed by\n"
				"WARNING: prefixing old- to their name, in order to\n"
				"WARNING: replace them with the new version of the\n"
				"WARNING: file.  But the operation failed, and the\n"
				"WARNING: attempt to rename them back to their\n"
				"WARNING: original names also failed.\n"
				"WARNING: Please rename them in %s manually:\n", packdir);
			for (i = 0; i < rollback_failure.nr; i++)
				fprintf(stderr, "WARNING:   old-%s -> %s\n",
					rollback_failure.items[i].string,
					rollback_failure.items[i].string);
		}
		exit(1);
	}

	/* Now the ones with the same name are out of the way... */
	for_each_string_list_item(item, &names) {
		for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
			char *fname, *fname_old;
			struct stat statbuffer;
			int exists = 0;
			fname = mkpathdup("%s/pack-%s%s",
					packdir, item->string, exts[ext].name);
			fname_old = mkpathdup("%s-%s%s",
					packtmp, item->string, exts[ext].name);
			if (!stat(fname_old, &statbuffer)) {
				statbuffer.st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
				chmod(fname_old, statbuffer.st_mode);
				exists = 1;
			}
			if (exists || !exts[ext].optional) {
				if (rename(fname_old, fname))
					die_errno(_("renaming '%s' failed"), fname_old);
			}
			free(fname);
			free(fname_old);
		}
	}

	/* Remove the "old-" files */
	for_each_string_list_item(item, &names) {
		for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
			char *fname;
			fname = mkpathdup("%s/old-%s%s",
					  packdir,
					  item->string,
					  exts[ext].name);
			if (remove_path(fname))
				warning(_("failed to remove '%s'"), fname);
			free(fname);
		}
	}

	/* End of pack replacement. */

	reprepare_packed_git(the_repository);

	if (delete_redundant) {
		int opts = 0;
		string_list_sort(&names);
		for_each_string_list_item(item, &existing_packs) {
			char *sha1;
			size_t len = strlen(item->string);
			if (len < 40)
				continue;
			sha1 = item->string + len - 40;
			if (!string_list_has_string(&names, sha1))
				remove_redundant_pack(packdir, item->string);
		}
		if (!po_args.quiet && isatty(2))
			opts |= PRUNE_PACKED_VERBOSE;
		prune_packed_objects(opts);
	}

	if (!no_update_server_info)
		update_server_info(0);
	remove_temporary_files();
	string_list_clear(&names, 0);
	string_list_clear(&rollback, 0);
	string_list_clear(&existing_packs, 0);
	strbuf_release(&line);

	return 0;
}
Commit	Line	Data
a1bbc6c0 SB	1	#include "builtin.h"
a1bbc6c0 SB	2	#include "cache.h"
b2141fc1	3	#include "config.h"
a1bbc6c0 SB	4	#include "dir.h"
	5	#include "parse-options.h"
	6	#include "run-command.h"
	7	#include "sigchain.h"
	8	#include "strbuf.h"
	9	#include "string-list.h"
	10	#include "argv-array.h"
5d19e813	11	#include "packfile.h"
36f0f344	12	#include "object-store.h"
a1bbc6c0 SB	13
a1bbc6c0 SB	14	static int delta_base_offset = 1;
ee34a2be	15	static int pack_kept_objects = -1;
2bed2d47	16	static int write_bitmaps;
a1bbc6c0 SB	17	static char packdir, packtmp;
	18
	19	static const char *const git_repack_usage[] = {
9c9b4f2f	20	N_("git repack [<options>]"),
a1bbc6c0 SB	21	NULL
	22	};
	23
1c409a70 DT	24	static const char incremental_bitmap_conflict_error[] = N_(
	25	"Incremental repacks are incompatible with bitmap indexes. Use\n"
	26	"--no-write-bitmap-index or disable the pack.writebitmaps configuration."
	27	);
	28
	29
a1bbc6c0 SB	30	static int repack_config(const char var, const char value, void *cb)
	31	{
	32	if (!strcmp(var, "repack.usedeltabaseoffset")) {
	33	delta_base_offset = git_config_bool(var, value);
	34	return 0;
	35	}
ee34a2be JK	36	if (!strcmp(var, "repack.packkeptobjects")) {
	37	pack_kept_objects = git_config_bool(var, value);
	38	return 0;
	39	}
71d76cb4 JK	40	if (!strcmp(var, "repack.writebitmaps") \|\|
71d76cb4 JK	41	!strcmp(var, "pack.writebitmaps")) {
d078d85b	42	write_bitmaps = git_config_bool(var, value);
3198b89f JK	43	return 0;
3198b89f JK	44	}
a1bbc6c0 SB	45	return git_default_config(var, value, cb);
	46	}
	47
	48	/*
	49	* Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
	50	*/
	51	static void remove_temporary_files(void)
	52	{
	53	struct strbuf buf = STRBUF_INIT;
	54	size_t dirlen, prefixlen;
	55	DIR *dir;
	56	struct dirent *e;
	57
	58	dir = opendir(packdir);
	59	if (!dir)
	60	return;
	61
	62	/* Point at the slash at the end of ".../objects/pack/" */
	63	dirlen = strlen(packdir) + 1;
	64	strbuf_addstr(&buf, packtmp);
	65	/* Hold the length of ".tmp-%d-pack-" */
	66	prefixlen = buf.len - dirlen;
	67
	68	while ((e = readdir(dir))) {
	69	if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
	70	continue;
	71	strbuf_setlen(&buf, dirlen);
	72	strbuf_addstr(&buf, e->d_name);
	73	unlink(buf.buf);
	74	}
	75	closedir(dir);
	76	strbuf_release(&buf);
	77	}
	78
	79	static void remove_pack_on_signal(int signo)
	80	{
	81	remove_temporary_files();
	82	sigchain_pop(signo);
	83	raise(signo);
	84	}
	85
	86	/*
	87	* Adds all packs hex strings to the fname list, which do not
5d19e813	88	* have a corresponding .keep file. These packs are not to
0c16cd49	89	* be kept if we are going to pack everything into one file.
a1bbc6c0	90	*/
ed7e5fc3 NTND	91	static void get_non_kept_pack_filenames(struct string_list *fname_list,
ed7e5fc3 NTND	92	const struct string_list *extra_keep)
a1bbc6c0 SB	93	{
	94	DIR *dir;
	95	struct dirent *e;
	96	char *fname;
a1bbc6c0 SB	97
	98	if (!(dir = opendir(packdir)))
	99	return;
	100
	101	while ((e = readdir(dir)) != NULL) {
26936bfd	102	size_t len;
ed7e5fc3 NTND	103	int i;
	104
	105	for (i = 0; i < extra_keep->nr; i++)
	106	if (!fspathcmp(e->d_name, extra_keep->items[i].string))
	107	break;
	108	if (extra_keep->nr > 0 && i < extra_keep->nr)
	109	continue;
	110
26936bfd	111	if (!strip_suffix(e->d_name, ".pack", &len))
a1bbc6c0 SB	112	continue;
a1bbc6c0 SB	113
a1bbc6c0 SB	114	fname = xmemdupz(e->d_name, len);
a1bbc6c0 SB	115
5d19e813	116	if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
a1bbc6c0 SB	117	string_list_append_nodup(fname_list, fname);
	118	else
	119	free(fname);
	120	}
	121	closedir(dir);
	122	}
	123
	124	static void remove_redundant_pack(const char dir_name, const char base_name)
	125	{
5d19e813	126	const char *exts[] = {".pack", ".idx", ".keep", ".bitmap", ".promisor"};
a1bbc6c0 SB	127	int i;
	128	struct strbuf buf = STRBUF_INIT;
	129	size_t plen;
	130
	131	strbuf_addf(&buf, "%s/%s", dir_name, base_name);
	132	plen = buf.len;
	133
	134	for (i = 0; i < ARRAY_SIZE(exts); i++) {
	135	strbuf_setlen(&buf, plen);
	136	strbuf_addstr(&buf, exts[i]);
	137	unlink(buf.buf);
	138	}
	139	strbuf_release(&buf);
	140	}
	141
2b958e79 JT	142	struct pack_objects_args {
	143	const char *window;
	144	const char *window_memory;
	145	const char *depth;
	146	const char *threads;
	147	const char *max_pack_size;
	148	int no_reuse_delta;
	149	int no_reuse_object;
	150	int quiet;
	151	int local;
	152	};
	153
	154	static void prepare_pack_objects(struct child_process *cmd,
	155	const struct pack_objects_args *args)
	156	{
	157	argv_array_push(&cmd->args, "pack-objects");
	158	if (args->window)
	159	argv_array_pushf(&cmd->args, "--window=%s", args->window);
	160	if (args->window_memory)
	161	argv_array_pushf(&cmd->args, "--window-memory=%s", args->window_memory);
	162	if (args->depth)
	163	argv_array_pushf(&cmd->args, "--depth=%s", args->depth);
	164	if (args->threads)
	165	argv_array_pushf(&cmd->args, "--threads=%s", args->threads);
	166	if (args->max_pack_size)
	167	argv_array_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size);
	168	if (args->no_reuse_delta)
	169	argv_array_pushf(&cmd->args, "--no-reuse-delta");
	170	if (args->no_reuse_object)
	171	argv_array_pushf(&cmd->args, "--no-reuse-object");
	172	if (args->local)
	173	argv_array_push(&cmd->args, "--local");
	174	if (args->quiet)
	175	argv_array_push(&cmd->args, "--quiet");
	176	if (delta_base_offset)
	177	argv_array_push(&cmd->args, "--delta-base-offset");
	178	argv_array_push(&cmd->args, packtmp);
	179	cmd->git_cmd = 1;
	180	cmd->out = -1;
	181	}
	182
5d19e813 JT	183	/*
	184	* Write oid to the given struct child_process's stdin, starting it first if
	185	* necessary.
	186	*/
	187	static int write_oid(const struct object_id oid, struct packed_git pack,
	188	uint32_t pos, void *data)
	189	{
	190	struct child_process *cmd = data;
	191
	192	if (cmd->in == -1) {
	193	if (start_command(cmd))
	194	die("Could not start pack-objects to repack promisor objects");
	195	}
	196
	197	xwrite(cmd->in, oid_to_hex(oid), GIT_SHA1_HEXSZ);
	198	xwrite(cmd->in, "\n", 1);
	199	return 0;
	200	}
	201
	202	static void repack_promisor_objects(const struct pack_objects_args *args,
	203	struct string_list *names)
	204	{
	205	struct child_process cmd = CHILD_PROCESS_INIT;
	206	FILE *out;
	207	struct strbuf line = STRBUF_INIT;
	208
	209	prepare_pack_objects(&cmd, args);
	210	cmd.in = -1;
	211
	212	/*
	213	* NEEDSWORK: Giving pack-objects only the OIDs without any ordering
	214	* hints may result in suboptimal deltas in the resulting pack. See if
	215	* the OIDs can be sent with fake paths such that pack-objects can use a
	216	* {type -> existing pack order} ordering when computing deltas instead
	217	* of a {type -> size} ordering, which may produce better deltas.
	218	*/
	219	for_each_packed_object(write_oid, &cmd,
	220	FOR_EACH_OBJECT_PROMISOR_ONLY);
	221
	222	if (cmd.in == -1)
	223	/* No packed objects; cmd was never started */
	224	return;
	225
	226	close(cmd.in);
	227
	228	out = xfdopen(cmd.out, "r");
	229	while (strbuf_getline_lf(&line, out) != EOF) {
	230	char *promisor_name;
	231	int fd;
	232	if (line.len != 40)
	233	die("repack: Expecting 40 character sha1 lines only from pack-objects.");
	234	string_list_append(names, line.buf);
	235
	236	/*
	237	* pack-objects creates the .pack and .idx files, but not the
	238	* .promisor file. Create the .promisor file, which is empty.
	239	*/
	240	promisor_name = mkpathdup("%s-%s.promisor", packtmp,
	241	line.buf);
	242	fd = open(promisor_name, O_CREAT\|O_EXCL\|O_WRONLY, 0600);
	243	if (fd < 0)
	244	die_errno("unable to create '%s'", promisor_name);
	245	close(fd);
	246	free(promisor_name);
247	}
248	fclose(out);
249	if (finish_command(&cmd))
250	die("Could not finish pack-objects to repack promisor objects");
251	}
252
a1bbc6c0 SB	253	#define ALL_INTO_ONE 1
	254	#define LOOSEN_UNREACHABLE 2
	255
	256	int cmd_repack(int argc, const char *argv, const char prefix)
	257	{
42a02d85 JK	258	struct {
42a02d85 JK	259	const char *name;
b77fcd1e	260	unsigned optional:1;
42a02d85 JK	261	} exts[] = {
	262	{".pack"},
	263	{".idx"},
5cf2741c	264	{".bitmap", 1},
5d19e813	265	{".promisor", 1},
42a02d85	266	};
d3180279	267	struct child_process cmd = CHILD_PROCESS_INIT;
a1bbc6c0	268	struct string_list_item *item;
a1bbc6c0 SB	269	struct string_list names = STRING_LIST_INIT_DUP;
	270	struct string_list rollback = STRING_LIST_INIT_NODUP;
	271	struct string_list existing_packs = STRING_LIST_INIT_DUP;
	272	struct strbuf line = STRBUF_INIT;
ed7e5fc3	273	int i, ext, ret, failed;
a1bbc6c0 SB	274	FILE *out;
	275
	276	/* variables to be filled by option parsing */
	277	int pack_everything = 0;
	278	int delete_redundant = 0;
aa8bd519	279	const char *unpack_unreachable = NULL;
905f27b8	280	int keep_unreachable = 0;
ed7e5fc3	281	struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
a1bbc6c0	282	int no_update_server_info = 0;
2b958e79	283	struct pack_objects_args po_args = {NULL};
a1bbc6c0 SB	284
	285	struct option builtin_repack_options[] = {
	286	OPT_BIT('a', NULL, &pack_everything,
	287	N_("pack everything in a single pack"), ALL_INTO_ONE),
	288	OPT_BIT('A', NULL, &pack_everything,
	289	N_("same as -a, and turn unreachable objects loose"),
	290	LOOSEN_UNREACHABLE \| ALL_INTO_ONE),
	291	OPT_BOOL('d', NULL, &delete_redundant,
	292	N_("remove redundant packs, and run git-prune-packed")),
2b958e79	293	OPT_BOOL('f', NULL, &po_args.no_reuse_delta,
a1bbc6c0	294	N_("pass --no-reuse-delta to git-pack-objects")),
2b958e79	295	OPT_BOOL('F', NULL, &po_args.no_reuse_object,
a1bbc6c0 SB	296	N_("pass --no-reuse-object to git-pack-objects")),
	297	OPT_BOOL('n', NULL, &no_update_server_info,
	298	N_("do not run git-update-server-info")),
2b958e79 JT	299	OPT__QUIET(&po_args.quiet, N_("be quiet")),
2b958e79 JT	300	OPT_BOOL('l', "local", &po_args.local,
a1bbc6c0	301	N_("pass --local to git-pack-objects")),
d078d85b	302	OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
5cf2741c	303	N_("write bitmap index")),
a1bbc6c0 SB	304	OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
a1bbc6c0 SB	305	N_("with -A, do not loosen objects older than this")),
905f27b8 JK	306	OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
905f27b8 JK	307	N_("with -a, repack unreachable objects")),
2b958e79	308	OPT_STRING(0, "window", &po_args.window, N_("n"),
a1bbc6c0	309	N_("size of the window used for delta compression")),
2b958e79	310	OPT_STRING(0, "window-memory", &po_args.window_memory, N_("bytes"),
a1bbc6c0	311	N_("same as the above, but limit memory size instead of entries count")),
2b958e79	312	OPT_STRING(0, "depth", &po_args.depth, N_("n"),
a1bbc6c0	313	N_("limits the maximum delta depth")),
2b958e79	314	OPT_STRING(0, "threads", &po_args.threads, N_("n"),
40bcf318	315	N_("limits the maximum number of threads")),
2b958e79	316	OPT_STRING(0, "max-pack-size", &po_args.max_pack_size, N_("bytes"),
a1bbc6c0	317	N_("maximum size of each packfile")),
ee34a2be JK	318	OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
ee34a2be JK	319	N_("repack objects in packs marked with .keep")),
ed7e5fc3 NTND	320	OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
ed7e5fc3 NTND	321	N_("do not repack this pack")),
a1bbc6c0 SB	322	OPT_END()
	323	};
	324
	325	git_config(repack_config, NULL);
	326
	327	argc = parse_options(argc, argv, prefix, builtin_repack_options,
	328	git_repack_usage, 0);
	329
067fbd41 JK	330	if (delete_redundant && repository_format_precious_objects)
	331	die(_("cannot delete packs in a precious-objects repo"));
	332
905f27b8 JK	333	if (keep_unreachable &&
	334	(unpack_unreachable \|\| (pack_everything & LOOSEN_UNREACHABLE)))
	335	die(_("--keep-unreachable and -A are incompatible"));
	336
ee34a2be	337	if (pack_kept_objects < 0)
2bed2d47	338	pack_kept_objects = write_bitmaps;
ee34a2be	339
1c409a70 DT	340	if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
	341	die(_(incremental_bitmap_conflict_error));
	342
a1bbc6c0 SB	343	packdir = mkpathdup("%s/pack", get_object_directory());
	344	packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
	345
	346	sigchain_push_common(remove_pack_on_signal);
	347
2b958e79 JT	348	prepare_pack_objects(&cmd, &po_args);
2b958e79 JT	349
a2bae2dc	350	argv_array_push(&cmd.args, "--keep-true-parents");
ee34a2be	351	if (!pack_kept_objects)
a2bae2dc	352	argv_array_push(&cmd.args, "--honor-pack-keep");
ed7e5fc3 NTND	353	for (i = 0; i < keep_pack_list.nr; i++)
	354	argv_array_pushf(&cmd.args, "--keep-pack=%s",
	355	keep_pack_list.items[i].string);
a2bae2dc RS	356	argv_array_push(&cmd.args, "--non-empty");
	357	argv_array_push(&cmd.args, "--all");
	358	argv_array_push(&cmd.args, "--reflog");
	359	argv_array_push(&cmd.args, "--indexed-objects");
0c16cd49 JT	360	if (repository_format_partial_clone)
0c16cd49 JT	361	argv_array_push(&cmd.args, "--exclude-promisor-objects");
2bed2d47	362	if (write_bitmaps)
a2bae2dc	363	argv_array_push(&cmd.args, "--write-bitmap-index");
a1bbc6c0 SB	364
a1bbc6c0 SB	365	if (pack_everything & ALL_INTO_ONE) {
ed7e5fc3	366	get_non_kept_pack_filenames(&existing_packs, &keep_pack_list);
a1bbc6c0	367
5d19e813 JT	368	repack_promisor_objects(&po_args, &names);
5d19e813 JT	369
a1bbc6c0	370	if (existing_packs.nr && delete_redundant) {
8d422993	371	if (unpack_unreachable) {
a2bae2dc	372	argv_array_pushf(&cmd.args,
a1bbc6c0 SB	373	"--unpack-unreachable=%s",
a1bbc6c0 SB	374	unpack_unreachable);
8d422993 JK	375	argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
8d422993 JK	376	} else if (pack_everything & LOOSEN_UNREACHABLE) {
a2bae2dc	377	argv_array_push(&cmd.args,
a1bbc6c0	378	"--unpack-unreachable");
905f27b8 JK	379	} else if (keep_unreachable) {
905f27b8 JK	380	argv_array_push(&cmd.args, "--keep-unreachable");
e26a8c47	381	argv_array_push(&cmd.args, "--pack-loose-unreachable");
8d422993 JK	382	} else {
	383	argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
	384	}
a1bbc6c0 SB	385	}
a1bbc6c0 SB	386	} else {
a2bae2dc RS	387	argv_array_push(&cmd.args, "--unpacked");
a2bae2dc RS	388	argv_array_push(&cmd.args, "--incremental");
a1bbc6c0 SB	389	}
a1bbc6c0 SB	390
a1bbc6c0 SB	391	cmd.no_stdin = 1;
	392
	393	ret = start_command(&cmd);
	394	if (ret)
ffc9329f	395	return ret;
a1bbc6c0	396
a1bbc6c0	397	out = xfdopen(cmd.out, "r");
8f309aeb	398	while (strbuf_getline_lf(&line, out) != EOF) {
a1bbc6c0 SB	399	if (line.len != 40)
	400	die("repack: Expecting 40 character sha1 lines only from pack-objects.");
	401	string_list_append(&names, line.buf);
a1bbc6c0 SB	402	}
	403	fclose(out);
	404	ret = finish_command(&cmd);
	405	if (ret)
ffc9329f	406	return ret;
a1bbc6c0	407
2b958e79	408	if (!names.nr && !po_args.quiet)
a1bbc6c0 SB	409	printf("Nothing new to pack.\n");
	410
	411	/*
	412	* Ok we have prepared all new packfiles.
	413	* First see if there are packs of the same name and if so
	414	* if we can move them out of the way (this can happen if we
	415	* repacked immediately after packing fully.
	416	*/
	417	failed = 0;
	418	for_each_string_list_item(item, &names) {
b328c216	419	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
e3cf2303	420	char fname, fname_old;
9d7fbfd2	421	fname = mkpathdup("%s/pack-%s%s", packdir,
42a02d85	422	item->string, exts[ext].name);
a1bbc6c0 SB	423	if (!file_exists(fname)) {
	424	free(fname);
	425	continue;
	426	}
	427
e3cf2303	428	fname_old = mkpathdup("%s/old-%s%s", packdir,
42a02d85	429	item->string, exts[ext].name);
a1bbc6c0 SB	430	if (file_exists(fname_old))
	431	if (unlink(fname_old))
	432	failed = 1;
	433
	434	if (!failed && rename(fname, fname_old)) {
	435	free(fname);
e3cf2303	436	free(fname_old);
a1bbc6c0 SB	437	failed = 1;
	438	break;
	439	} else {
	440	string_list_append(&rollback, fname);
e3cf2303	441	free(fname_old);
a1bbc6c0 SB	442	}
	443	}
	444	if (failed)
	445	break;
	446	}
	447	if (failed) {
	448	struct string_list rollback_failure = STRING_LIST_INIT_DUP;
	449	for_each_string_list_item(item, &rollback) {
e3cf2303	450	char fname, fname_old;
a1bbc6c0	451	fname = mkpathdup("%s/%s", packdir, item->string);
e3cf2303	452	fname_old = mkpathdup("%s/old-%s", packdir, item->string);
a1bbc6c0 SB	453	if (rename(fname_old, fname))
	454	string_list_append(&rollback_failure, fname);
	455	free(fname);
e3cf2303	456	free(fname_old);
a1bbc6c0 SB	457	}
	458
	459	if (rollback_failure.nr) {
	460	int i;
	461	fprintf(stderr,
	462	"WARNING: Some packs in use have been renamed by\n"
	463	"WARNING: prefixing old- to their name, in order to\n"
	464	"WARNING: replace them with the new version of the\n"
	465	"WARNING: file. But the operation failed, and the\n"
	466	"WARNING: attempt to rename them back to their\n"
	467	"WARNING: original names also failed.\n"
	468	"WARNING: Please rename them in %s manually:\n", packdir);
	469	for (i = 0; i < rollback_failure.nr; i++)
	470	fprintf(stderr, "WARNING: old-%s -> %s\n",
	471	rollback_failure.items[i].string,
	472	rollback_failure.items[i].string);
	473	}
	474	exit(1);
	475	}
	476
	477	/* Now the ones with the same name are out of the way... */
	478	for_each_string_list_item(item, &names) {
b328c216	479	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
a1bbc6c0 SB	480	char fname, fname_old;
a1bbc6c0 SB	481	struct stat statbuffer;
b77fcd1e	482	int exists = 0;
a1bbc6c0	483	fname = mkpathdup("%s/pack-%s%s",
42a02d85	484	packdir, item->string, exts[ext].name);
a1bbc6c0	485	fname_old = mkpathdup("%s-%s%s",
42a02d85	486	packtmp, item->string, exts[ext].name);
a1bbc6c0 SB	487	if (!stat(fname_old, &statbuffer)) {
	488	statbuffer.st_mode &= ~(S_IWUSR \| S_IWGRP \| S_IWOTH);
	489	chmod(fname_old, statbuffer.st_mode);
b77fcd1e JK	490	exists = 1;
	491	}
	492	if (exists \|\| !exts[ext].optional) {
	493	if (rename(fname_old, fname))
	494	die_errno(_("renaming '%s' failed"), fname_old);
a1bbc6c0	495	}
a1bbc6c0 SB	496	free(fname);
	497	free(fname_old);
	498	}
	499	}
	500
	501	/* Remove the "old-" files */
	502	for_each_string_list_item(item, &names) {
b328c216	503	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
e3cf2303 JK	504	char *fname;
	505	fname = mkpathdup("%s/old-%s%s",
	506	packdir,
	507	item->string,
	508	exts[ext].name);
0b63c6a5	509	if (remove_path(fname))
e923a8ab	510	warning(_("failed to remove '%s'"), fname);
e3cf2303	511	free(fname);
a1bbc6c0 SB	512	}
	513	}
	514
	515	/* End of pack replacement. */
	516
5d19e813 JT	517	reprepare_packed_git(the_repository);
5d19e813 JT	518
a1bbc6c0	519	if (delete_redundant) {
4489a480	520	int opts = 0;
3383e199	521	string_list_sort(&names);
a1bbc6c0 SB	522	for_each_string_list_item(item, &existing_packs) {
	523	char *sha1;
	524	size_t len = strlen(item->string);
	525	if (len < 40)
	526	continue;
	527	sha1 = item->string + len - 40;
	528	if (!string_list_has_string(&names, sha1))
	529	remove_redundant_pack(packdir, item->string);
	530	}
2b958e79	531	if (!po_args.quiet && isatty(2))
4489a480 RS	532	opts \|= PRUNE_PACKED_VERBOSE;
4489a480 RS	533	prune_packed_objects(opts);
a1bbc6c0 SB	534	}
a1bbc6c0 SB	535
4489a480 RS	536	if (!no_update_server_info)
4489a480 RS	537	update_server_info(0);
a1bbc6c0 SB	538	remove_temporary_files();
	539	string_list_clear(&names, 0);
	540	string_list_clear(&rollback, 0);
	541	string_list_clear(&existing_packs, 0);
	542	strbuf_release(&line);
	543
	544	return 0;
	545	}