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