[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 "midx.h"
#include "packfile.h"
#include "object-store.h"

static int delta_base_offset = 1;
static int pack_kept_objects = -1;
static int write_bitmaps = -1;
static int use_delta_islands;
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;
	}
	if (!strcmp(var, "repack.usedeltaislands")) {
		use_delta_islands = 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)
{
	struct strbuf buf = STRBUF_INIT;
	strbuf_addf(&buf, "%s/%s.pack", dir_name, base_name);
	unlink_pack_path(buf.buf, 1);
	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 != the_hash_algo->hexsz)
			die(_("repack: Expecting full hex object ID 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;
	int midx_cleared = 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_BOOL('i', "delta-islands", &use_delta_islands,
				N_("pass --delta-islands to git-pack-objects")),
		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 (write_bitmaps < 0) {
		if (!(pack_everything & ALL_INTO_ONE) ||
		    !is_bare_repository())
			write_bitmaps = 0;
	}
	if (pack_kept_objects < 0)
		pack_kept_objects = write_bitmaps > 0;

	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 > 0)
		argv_array_push(&cmd.args, "--write-bitmap-index");
	else if (write_bitmaps < 0)
		argv_array_push(&cmd.args, "--write-bitmap-index-quiet");
	if (use_delta_islands)
		argv_array_push(&cmd.args, "--delta-islands");

	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 != the_hash_algo->hexsz)
			die(_("repack: Expecting full hex object ID 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_ln(_("Nothing new to pack."));

	close_object_store(the_repository->objects);

	/*
	 * 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;

			if (!midx_cleared) {
				clear_midx_file(the_repository);
				midx_cleared = 1;
			}

			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) {
		const int hexsz = the_hash_algo->hexsz;
		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 < hexsz)
				continue;
			sha1 = item->string + len - hexsz;
			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 (!keep_unreachable &&
		    (!(pack_everything & LOOSEN_UNREACHABLE) ||
		     unpack_unreachable) &&
		    is_repository_shallow(the_repository))
			prune_shallow(PRUNE_QUICK);
	}

	if (!no_update_server_info)
		update_server_info(0);
	remove_temporary_files();

	if (git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0))
		write_midx_file(get_object_directory());

	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"
525e18c0	11	#include "midx.h"
5d19e813	12	#include "packfile.h"
36f0f344	13	#include "object-store.h"
a1bbc6c0 SB	14
a1bbc6c0 SB	15	static int delta_base_offset = 1;
ee34a2be	16	static int pack_kept_objects = -1;
36eba032	17	static int write_bitmaps = -1;
16d75fa4	18	static int use_delta_islands;
a1bbc6c0 SB	19	static char packdir, packtmp;
	20
	21	static const char *const git_repack_usage[] = {
9c9b4f2f	22	N_("git repack [<options>]"),
a1bbc6c0 SB	23	NULL
	24	};
	25
1c409a70 DT	26	static const char incremental_bitmap_conflict_error[] = N_(
	27	"Incremental repacks are incompatible with bitmap indexes. Use\n"
	28	"--no-write-bitmap-index or disable the pack.writebitmaps configuration."
	29	);
	30
	31
a1bbc6c0 SB	32	static int repack_config(const char var, const char value, void *cb)
	33	{
	34	if (!strcmp(var, "repack.usedeltabaseoffset")) {
	35	delta_base_offset = git_config_bool(var, value);
	36	return 0;
	37	}
ee34a2be JK	38	if (!strcmp(var, "repack.packkeptobjects")) {
	39	pack_kept_objects = git_config_bool(var, value);
	40	return 0;
	41	}
71d76cb4 JK	42	if (!strcmp(var, "repack.writebitmaps") \|\|
71d76cb4 JK	43	!strcmp(var, "pack.writebitmaps")) {
d078d85b	44	write_bitmaps = git_config_bool(var, value);
3198b89f JK	45	return 0;
3198b89f JK	46	}
16d75fa4 JK	47	if (!strcmp(var, "repack.usedeltaislands")) {
	48	use_delta_islands = git_config_bool(var, value);
	49	return 0;
	50	}
a1bbc6c0 SB	51	return git_default_config(var, value, cb);
	52	}
	53
	54	/*
	55	* Remove temporary $GIT_OBJECT_DIRECTORY/pack/.tmp-$$-pack-* files.
	56	*/
	57	static void remove_temporary_files(void)
	58	{
	59	struct strbuf buf = STRBUF_INIT;
	60	size_t dirlen, prefixlen;
	61	DIR *dir;
	62	struct dirent *e;
	63
	64	dir = opendir(packdir);
	65	if (!dir)
	66	return;
	67
	68	/* Point at the slash at the end of ".../objects/pack/" */
	69	dirlen = strlen(packdir) + 1;
	70	strbuf_addstr(&buf, packtmp);
	71	/* Hold the length of ".tmp-%d-pack-" */
	72	prefixlen = buf.len - dirlen;
	73
	74	while ((e = readdir(dir))) {
	75	if (strncmp(e->d_name, buf.buf + dirlen, prefixlen))
	76	continue;
	77	strbuf_setlen(&buf, dirlen);
	78	strbuf_addstr(&buf, e->d_name);
	79	unlink(buf.buf);
	80	}
	81	closedir(dir);
	82	strbuf_release(&buf);
	83	}
	84
	85	static void remove_pack_on_signal(int signo)
	86	{
	87	remove_temporary_files();
	88	sigchain_pop(signo);
	89	raise(signo);
	90	}
	91
	92	/*
	93	* Adds all packs hex strings to the fname list, which do not
5d19e813	94	* have a corresponding .keep file. These packs are not to
0c16cd49	95	* be kept if we are going to pack everything into one file.
a1bbc6c0	96	*/
ed7e5fc3 NTND	97	static void get_non_kept_pack_filenames(struct string_list *fname_list,
ed7e5fc3 NTND	98	const struct string_list *extra_keep)
a1bbc6c0 SB	99	{
	100	DIR *dir;
	101	struct dirent *e;
	102	char *fname;
a1bbc6c0 SB	103
	104	if (!(dir = opendir(packdir)))
	105	return;
	106
	107	while ((e = readdir(dir)) != NULL) {
26936bfd	108	size_t len;
ed7e5fc3 NTND	109	int i;
	110
	111	for (i = 0; i < extra_keep->nr; i++)
	112	if (!fspathcmp(e->d_name, extra_keep->items[i].string))
	113	break;
	114	if (extra_keep->nr > 0 && i < extra_keep->nr)
	115	continue;
	116
26936bfd	117	if (!strip_suffix(e->d_name, ".pack", &len))
a1bbc6c0 SB	118	continue;
a1bbc6c0 SB	119
a1bbc6c0 SB	120	fname = xmemdupz(e->d_name, len);
a1bbc6c0 SB	121
5d19e813	122	if (!file_exists(mkpath("%s/%s.keep", packdir, fname)))
a1bbc6c0 SB	123	string_list_append_nodup(fname_list, fname);
	124	else
	125	free(fname);
	126	}
	127	closedir(dir);
	128	}
	129
	130	static void remove_redundant_pack(const char dir_name, const char base_name)
	131	{
a1bbc6c0	132	struct strbuf buf = STRBUF_INIT;
8434e85d DS	133	strbuf_addf(&buf, "%s/%s.pack", dir_name, base_name);
8434e85d DS	134	unlink_pack_path(buf.buf, 1);
a1bbc6c0 SB	135	strbuf_release(&buf);
	136	}
	137
2b958e79 JT	138	struct pack_objects_args {
	139	const char *window;
	140	const char *window_memory;
	141	const char *depth;
	142	const char *threads;
	143	const char *max_pack_size;
	144	int no_reuse_delta;
	145	int no_reuse_object;
	146	int quiet;
	147	int local;
	148	};
	149
	150	static void prepare_pack_objects(struct child_process *cmd,
	151	const struct pack_objects_args *args)
	152	{
	153	argv_array_push(&cmd->args, "pack-objects");
	154	if (args->window)
	155	argv_array_pushf(&cmd->args, "--window=%s", args->window);
	156	if (args->window_memory)
	157	argv_array_pushf(&cmd->args, "--window-memory=%s", args->window_memory);
	158	if (args->depth)
	159	argv_array_pushf(&cmd->args, "--depth=%s", args->depth);
	160	if (args->threads)
	161	argv_array_pushf(&cmd->args, "--threads=%s", args->threads);
	162	if (args->max_pack_size)
	163	argv_array_pushf(&cmd->args, "--max-pack-size=%s", args->max_pack_size);
	164	if (args->no_reuse_delta)
	165	argv_array_pushf(&cmd->args, "--no-reuse-delta");
	166	if (args->no_reuse_object)
	167	argv_array_pushf(&cmd->args, "--no-reuse-object");
	168	if (args->local)
	169	argv_array_push(&cmd->args, "--local");
	170	if (args->quiet)
	171	argv_array_push(&cmd->args, "--quiet");
	172	if (delta_base_offset)
	173	argv_array_push(&cmd->args, "--delta-base-offset");
	174	argv_array_push(&cmd->args, packtmp);
	175	cmd->git_cmd = 1;
	176	cmd->out = -1;
	177	}
	178
5d19e813 JT	179	/*
	180	* Write oid to the given struct child_process's stdin, starting it first if
	181	* necessary.
	182	*/
	183	static int write_oid(const struct object_id oid, struct packed_git pack,
	184	uint32_t pos, void *data)
	185	{
	186	struct child_process *cmd = data;
	187
	188	if (cmd->in == -1) {
	189	if (start_command(cmd))
c83d950e	190	die(_("could not start pack-objects to repack promisor objects"));
5d19e813 JT	191	}
	192
	193	xwrite(cmd->in, oid_to_hex(oid), GIT_SHA1_HEXSZ);
	194	xwrite(cmd->in, "\n", 1);
	195	return 0;
	196	}
	197
	198	static void repack_promisor_objects(const struct pack_objects_args *args,
	199	struct string_list *names)
	200	{
	201	struct child_process cmd = CHILD_PROCESS_INIT;
	202	FILE *out;
	203	struct strbuf line = STRBUF_INIT;
	204
	205	prepare_pack_objects(&cmd, args);
	206	cmd.in = -1;
	207
	208	/*
	209	* NEEDSWORK: Giving pack-objects only the OIDs without any ordering
	210	* hints may result in suboptimal deltas in the resulting pack. See if
	211	* the OIDs can be sent with fake paths such that pack-objects can use a
	212	* {type -> existing pack order} ordering when computing deltas instead
	213	* of a {type -> size} ordering, which may produce better deltas.
	214	*/
	215	for_each_packed_object(write_oid, &cmd,
	216	FOR_EACH_OBJECT_PROMISOR_ONLY);
	217
	218	if (cmd.in == -1)
	219	/* No packed objects; cmd was never started */
	220	return;
	221
	222	close(cmd.in);
	223
	224	out = xfdopen(cmd.out, "r");
	225	while (strbuf_getline_lf(&line, out) != EOF) {
	226	char *promisor_name;
	227	int fd;
2f0c9e9a	228	if (line.len != the_hash_algo->hexsz)
3813a89f	229	die(_("repack: Expecting full hex object ID lines only from pack-objects."));
5d19e813 JT	230	string_list_append(names, line.buf);
	231
	232	/*
	233	* pack-objects creates the .pack and .idx files, but not the
	234	* .promisor file. Create the .promisor file, which is empty.
	235	*/
	236	promisor_name = mkpathdup("%s-%s.promisor", packtmp,
	237	line.buf);
	238	fd = open(promisor_name, O_CREAT\|O_EXCL\|O_WRONLY, 0600);
	239	if (fd < 0)
c83d950e	240	die_errno(_("unable to create '%s'"), promisor_name);
5d19e813 JT	241	close(fd);
	242	free(promisor_name);
	243	}
	244	fclose(out);
	245	if (finish_command(&cmd))
c83d950e	246	die(_("could not finish pack-objects to repack promisor objects"));
5d19e813 JT	247	}
5d19e813 JT	248
a1bbc6c0 SB	249	#define ALL_INTO_ONE 1
	250	#define LOOSEN_UNREACHABLE 2
	251
	252	int cmd_repack(int argc, const char *argv, const char prefix)
	253	{
42a02d85 JK	254	struct {
42a02d85 JK	255	const char *name;
b77fcd1e	256	unsigned optional:1;
42a02d85 JK	257	} exts[] = {
	258	{".pack"},
	259	{".idx"},
5cf2741c	260	{".bitmap", 1},
5d19e813	261	{".promisor", 1},
42a02d85	262	};
d3180279	263	struct child_process cmd = CHILD_PROCESS_INIT;
a1bbc6c0	264	struct string_list_item *item;
a1bbc6c0 SB	265	struct string_list names = STRING_LIST_INIT_DUP;
	266	struct string_list rollback = STRING_LIST_INIT_NODUP;
	267	struct string_list existing_packs = STRING_LIST_INIT_DUP;
	268	struct strbuf line = STRBUF_INIT;
ed7e5fc3	269	int i, ext, ret, failed;
a1bbc6c0 SB	270	FILE *out;
	271
	272	/* variables to be filled by option parsing */
	273	int pack_everything = 0;
	274	int delete_redundant = 0;
aa8bd519	275	const char *unpack_unreachable = NULL;
905f27b8	276	int keep_unreachable = 0;
ed7e5fc3	277	struct string_list keep_pack_list = STRING_LIST_INIT_NODUP;
a1bbc6c0	278	int no_update_server_info = 0;
525e18c0	279	int midx_cleared = 0;
2b958e79	280	struct pack_objects_args po_args = {NULL};
a1bbc6c0 SB	281
	282	struct option builtin_repack_options[] = {
	283	OPT_BIT('a', NULL, &pack_everything,
	284	N_("pack everything in a single pack"), ALL_INTO_ONE),
	285	OPT_BIT('A', NULL, &pack_everything,
	286	N_("same as -a, and turn unreachable objects loose"),
	287	LOOSEN_UNREACHABLE \| ALL_INTO_ONE),
	288	OPT_BOOL('d', NULL, &delete_redundant,
	289	N_("remove redundant packs, and run git-prune-packed")),
2b958e79	290	OPT_BOOL('f', NULL, &po_args.no_reuse_delta,
a1bbc6c0	291	N_("pass --no-reuse-delta to git-pack-objects")),
2b958e79	292	OPT_BOOL('F', NULL, &po_args.no_reuse_object,
a1bbc6c0 SB	293	N_("pass --no-reuse-object to git-pack-objects")),
	294	OPT_BOOL('n', NULL, &no_update_server_info,
	295	N_("do not run git-update-server-info")),
2b958e79 JT	296	OPT__QUIET(&po_args.quiet, N_("be quiet")),
2b958e79 JT	297	OPT_BOOL('l', "local", &po_args.local,
a1bbc6c0	298	N_("pass --local to git-pack-objects")),
d078d85b	299	OPT_BOOL('b', "write-bitmap-index", &write_bitmaps,
5cf2741c	300	N_("write bitmap index")),
16d75fa4 JK	301	OPT_BOOL('i', "delta-islands", &use_delta_islands,
16d75fa4 JK	302	N_("pass --delta-islands to git-pack-objects")),
a1bbc6c0 SB	303	OPT_STRING(0, "unpack-unreachable", &unpack_unreachable, N_("approxidate"),
a1bbc6c0 SB	304	N_("with -A, do not loosen objects older than this")),
905f27b8 JK	305	OPT_BOOL('k', "keep-unreachable", &keep_unreachable,
905f27b8 JK	306	N_("with -a, repack unreachable objects")),
2b958e79	307	OPT_STRING(0, "window", &po_args.window, N_("n"),
a1bbc6c0	308	N_("size of the window used for delta compression")),
2b958e79	309	OPT_STRING(0, "window-memory", &po_args.window_memory, N_("bytes"),
a1bbc6c0	310	N_("same as the above, but limit memory size instead of entries count")),
2b958e79	311	OPT_STRING(0, "depth", &po_args.depth, N_("n"),
a1bbc6c0	312	N_("limits the maximum delta depth")),
2b958e79	313	OPT_STRING(0, "threads", &po_args.threads, N_("n"),
40bcf318	314	N_("limits the maximum number of threads")),
2b958e79	315	OPT_STRING(0, "max-pack-size", &po_args.max_pack_size, N_("bytes"),
a1bbc6c0	316	N_("maximum size of each packfile")),
ee34a2be JK	317	OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
ee34a2be JK	318	N_("repack objects in packs marked with .keep")),
ed7e5fc3 NTND	319	OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
ed7e5fc3 NTND	320	N_("do not repack this pack")),
a1bbc6c0 SB	321	OPT_END()
	322	};
	323
	324	git_config(repack_config, NULL);
	325
	326	argc = parse_options(argc, argv, prefix, builtin_repack_options,
	327	git_repack_usage, 0);
	328
067fbd41 JK	329	if (delete_redundant && repository_format_precious_objects)
	330	die(_("cannot delete packs in a precious-objects repo"));
	331
905f27b8 JK	332	if (keep_unreachable &&
	333	(unpack_unreachable \|\| (pack_everything & LOOSEN_UNREACHABLE)))
	334	die(_("--keep-unreachable and -A are incompatible"));
	335
73284822	336	if (write_bitmaps < 0) {
25575015	337	if (!(pack_everything & ALL_INTO_ONE) \|\|
7ff024e7	338	!is_bare_repository())
25575015	339	write_bitmaps = 0;
73284822	340	}
ee34a2be	341	if (pack_kept_objects < 0)
7ff024e7	342	pack_kept_objects = write_bitmaps > 0;
ee34a2be	343
1c409a70 DT	344	if (write_bitmaps && !(pack_everything & ALL_INTO_ONE))
	345	die(_(incremental_bitmap_conflict_error));
	346
a1bbc6c0 SB	347	packdir = mkpathdup("%s/pack", get_object_directory());
	348	packtmp = mkpathdup("%s/.tmp-%d-pack", packdir, (int)getpid());
	349
	350	sigchain_push_common(remove_pack_on_signal);
	351
2b958e79 JT	352	prepare_pack_objects(&cmd, &po_args);
2b958e79 JT	353
a2bae2dc	354	argv_array_push(&cmd.args, "--keep-true-parents");
ee34a2be	355	if (!pack_kept_objects)
a2bae2dc	356	argv_array_push(&cmd.args, "--honor-pack-keep");
ed7e5fc3 NTND	357	for (i = 0; i < keep_pack_list.nr; i++)
	358	argv_array_pushf(&cmd.args, "--keep-pack=%s",
	359	keep_pack_list.items[i].string);
a2bae2dc RS	360	argv_array_push(&cmd.args, "--non-empty");
	361	argv_array_push(&cmd.args, "--all");
	362	argv_array_push(&cmd.args, "--reflog");
	363	argv_array_push(&cmd.args, "--indexed-objects");
0c16cd49 JT	364	if (repository_format_partial_clone)
0c16cd49 JT	365	argv_array_push(&cmd.args, "--exclude-promisor-objects");
25575015	366	if (write_bitmaps > 0)
a2bae2dc	367	argv_array_push(&cmd.args, "--write-bitmap-index");
25575015 JK	368	else if (write_bitmaps < 0)
25575015 JK	369	argv_array_push(&cmd.args, "--write-bitmap-index-quiet");
16d75fa4 JK	370	if (use_delta_islands)
16d75fa4 JK	371	argv_array_push(&cmd.args, "--delta-islands");
a1bbc6c0 SB	372
a1bbc6c0 SB	373	if (pack_everything & ALL_INTO_ONE) {
ed7e5fc3	374	get_non_kept_pack_filenames(&existing_packs, &keep_pack_list);
a1bbc6c0	375
5d19e813 JT	376	repack_promisor_objects(&po_args, &names);
5d19e813 JT	377
a1bbc6c0	378	if (existing_packs.nr && delete_redundant) {
8d422993	379	if (unpack_unreachable) {
a2bae2dc	380	argv_array_pushf(&cmd.args,
a1bbc6c0 SB	381	"--unpack-unreachable=%s",
a1bbc6c0 SB	382	unpack_unreachable);
8d422993 JK	383	argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
8d422993 JK	384	} else if (pack_everything & LOOSEN_UNREACHABLE) {
a2bae2dc	385	argv_array_push(&cmd.args,
a1bbc6c0	386	"--unpack-unreachable");
905f27b8 JK	387	} else if (keep_unreachable) {
905f27b8 JK	388	argv_array_push(&cmd.args, "--keep-unreachable");
e26a8c47	389	argv_array_push(&cmd.args, "--pack-loose-unreachable");
8d422993 JK	390	} else {
	391	argv_array_push(&cmd.env_array, "GIT_REF_PARANOIA=1");
	392	}
a1bbc6c0 SB	393	}
a1bbc6c0 SB	394	} else {
a2bae2dc RS	395	argv_array_push(&cmd.args, "--unpacked");
a2bae2dc RS	396	argv_array_push(&cmd.args, "--incremental");
a1bbc6c0 SB	397	}
a1bbc6c0 SB	398
a1bbc6c0 SB	399	cmd.no_stdin = 1;
	400
	401	ret = start_command(&cmd);
	402	if (ret)
ffc9329f	403	return ret;
a1bbc6c0	404
a1bbc6c0	405	out = xfdopen(cmd.out, "r");
8f309aeb	406	while (strbuf_getline_lf(&line, out) != EOF) {
2f0c9e9a	407	if (line.len != the_hash_algo->hexsz)
3813a89f	408	die(_("repack: Expecting full hex object ID lines only from pack-objects."));
a1bbc6c0	409	string_list_append(&names, line.buf);
a1bbc6c0 SB	410	}
	411	fclose(out);
	412	ret = finish_command(&cmd);
	413	if (ret)
ffc9329f	414	return ret;
a1bbc6c0	415
2b958e79	416	if (!names.nr && !po_args.quiet)
c83d950e	417	printf_ln(_("Nothing new to pack."));
a1bbc6c0	418
2d511cfc	419	close_object_store(the_repository->objects);
5bdece0d	420
a1bbc6c0 SB	421	/*
	422	* Ok we have prepared all new packfiles.
	423	* First see if there are packs of the same name and if so
	424	* if we can move them out of the way (this can happen if we
	425	* repacked immediately after packing fully.
	426	*/
	427	failed = 0;
	428	for_each_string_list_item(item, &names) {
b328c216	429	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
e3cf2303	430	char fname, fname_old;
525e18c0 DS	431
525e18c0 DS	432	if (!midx_cleared) {
1dcd9f20	433	clear_midx_file(the_repository);
525e18c0 DS	434	midx_cleared = 1;
	435	}
	436
9d7fbfd2	437	fname = mkpathdup("%s/pack-%s%s", packdir,
42a02d85	438	item->string, exts[ext].name);
a1bbc6c0 SB	439	if (!file_exists(fname)) {
	440	free(fname);
	441	continue;
	442	}
	443
e3cf2303	444	fname_old = mkpathdup("%s/old-%s%s", packdir,
42a02d85	445	item->string, exts[ext].name);
a1bbc6c0 SB	446	if (file_exists(fname_old))
	447	if (unlink(fname_old))
	448	failed = 1;
	449
	450	if (!failed && rename(fname, fname_old)) {
	451	free(fname);
e3cf2303	452	free(fname_old);
a1bbc6c0 SB	453	failed = 1;
	454	break;
	455	} else {
	456	string_list_append(&rollback, fname);
e3cf2303	457	free(fname_old);
a1bbc6c0 SB	458	}
	459	}
	460	if (failed)
	461	break;
	462	}
	463	if (failed) {
	464	struct string_list rollback_failure = STRING_LIST_INIT_DUP;
	465	for_each_string_list_item(item, &rollback) {
e3cf2303	466	char fname, fname_old;
a1bbc6c0	467	fname = mkpathdup("%s/%s", packdir, item->string);
e3cf2303	468	fname_old = mkpathdup("%s/old-%s", packdir, item->string);
a1bbc6c0 SB	469	if (rename(fname_old, fname))
	470	string_list_append(&rollback_failure, fname);
	471	free(fname);
e3cf2303	472	free(fname_old);
a1bbc6c0 SB	473	}
	474
	475	if (rollback_failure.nr) {
	476	int i;
	477	fprintf(stderr,
c83d950e NTND	478	_("WARNING: Some packs in use have been renamed by\n"
	479	"WARNING: prefixing old- to their name, in order to\n"
	480	"WARNING: replace them with the new version of the\n"
	481	"WARNING: file. But the operation failed, and the\n"
	482	"WARNING: attempt to rename them back to their\n"
	483	"WARNING: original names also failed.\n"
	484	"WARNING: Please rename them in %s manually:\n"), packdir);
a1bbc6c0 SB	485	for (i = 0; i < rollback_failure.nr; i++)
	486	fprintf(stderr, "WARNING: old-%s -> %s\n",
	487	rollback_failure.items[i].string,
	488	rollback_failure.items[i].string);
	489	}
	490	exit(1);
	491	}
	492
	493	/* Now the ones with the same name are out of the way... */
	494	for_each_string_list_item(item, &names) {
b328c216	495	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
a1bbc6c0 SB	496	char fname, fname_old;
a1bbc6c0 SB	497	struct stat statbuffer;
b77fcd1e	498	int exists = 0;
a1bbc6c0	499	fname = mkpathdup("%s/pack-%s%s",
42a02d85	500	packdir, item->string, exts[ext].name);
a1bbc6c0	501	fname_old = mkpathdup("%s-%s%s",
42a02d85	502	packtmp, item->string, exts[ext].name);
a1bbc6c0 SB	503	if (!stat(fname_old, &statbuffer)) {
	504	statbuffer.st_mode &= ~(S_IWUSR \| S_IWGRP \| S_IWOTH);
	505	chmod(fname_old, statbuffer.st_mode);
b77fcd1e JK	506	exists = 1;
	507	}
	508	if (exists \|\| !exts[ext].optional) {
	509	if (rename(fname_old, fname))
	510	die_errno(_("renaming '%s' failed"), fname_old);
a1bbc6c0	511	}
a1bbc6c0 SB	512	free(fname);
	513	free(fname_old);
	514	}
	515	}
	516
	517	/* Remove the "old-" files */
	518	for_each_string_list_item(item, &names) {
b328c216	519	for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
e3cf2303 JK	520	char *fname;
	521	fname = mkpathdup("%s/old-%s%s",
	522	packdir,
	523	item->string,
	524	exts[ext].name);
0b63c6a5	525	if (remove_path(fname))
e923a8ab	526	warning(_("failed to remove '%s'"), fname);
e3cf2303	527	free(fname);
a1bbc6c0 SB	528	}
	529	}
	530
	531	/* End of pack replacement. */
	532
5d19e813 JT	533	reprepare_packed_git(the_repository);
5d19e813 JT	534
a1bbc6c0	535	if (delete_redundant) {
2f0c9e9a	536	const int hexsz = the_hash_algo->hexsz;
4489a480	537	int opts = 0;
3383e199	538	string_list_sort(&names);
a1bbc6c0 SB	539	for_each_string_list_item(item, &existing_packs) {
	540	char *sha1;
	541	size_t len = strlen(item->string);
2f0c9e9a	542	if (len < hexsz)
a1bbc6c0	543	continue;
2f0c9e9a	544	sha1 = item->string + len - hexsz;
a1bbc6c0 SB	545	if (!string_list_has_string(&names, sha1))
	546	remove_redundant_pack(packdir, item->string);
	547	}
2b958e79	548	if (!po_args.quiet && isatty(2))
4489a480 RS	549	opts \|= PRUNE_PACKED_VERBOSE;
4489a480 RS	550	prune_packed_objects(opts);
5dcfbf56 JS	551
	552	if (!keep_unreachable &&
	553	(!(pack_everything & LOOSEN_UNREACHABLE) \|\|
	554	unpack_unreachable) &&
	555	is_repository_shallow(the_repository))
	556	prune_shallow(PRUNE_QUICK);
a1bbc6c0 SB	557	}
a1bbc6c0 SB	558
4489a480 RS	559	if (!no_update_server_info)
4489a480 RS	560	update_server_info(0);
a1bbc6c0	561	remove_temporary_files();
0465a505 DS	562
	563	if (git_env_bool(GIT_TEST_MULTI_PACK_INDEX, 0))
	564	write_midx_file(get_object_directory());
	565
a1bbc6c0 SB	566	string_list_clear(&names, 0);
	567	string_list_clear(&rollback, 0);
	568	string_list_clear(&existing_packs, 0);
	569	strbuf_release(&line);
	570
	571	return 0;
	572	}