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archive: improve documentation of --prefix
[git/debian.git] / builtin / gc.c
blob8e60ef1eaba426eae66c99d15d5dfdcbc26efac4
1 /*
2 * git gc builtin command
3 *
4 * Cleanup unreachable files and optimize the repository.
5 *
6 * Copyright (c) 2007 James Bowes
7 *
8 * Based on git-gc.sh, which is
9 *
10 * Copyright (c) 2006 Shawn O. Pearce
11 */
12
13 #include "builtin.h"
14 #include "repository.h"
15 #include "config.h"
16 #include "tempfile.h"
17 #include "lockfile.h"
18 #include "parse-options.h"
19 #include "run-command.h"
20 #include "sigchain.h"
21 #include "strvec.h"
22 #include "commit.h"
23 #include "commit-graph.h"
24 #include "packfile.h"
25 #include "object-store.h"
26 #include "pack.h"
27 #include "pack-objects.h"
28 #include "blob.h"
29 #include "tree.h"
30 #include "promisor-remote.h"
31 #include "refs.h"
32 #include "remote.h"
33 #include "object-store.h"
34 #include "exec-cmd.h"
35
36 #define FAILED_RUN "failed to run %s"
37
38 static const char * const builtin_gc_usage[] = {
39 N_("git gc [<options>]"),
40 NULL
41 };
42
43 static int pack_refs = 1;
44 static int prune_reflogs = 1;
45 static int aggressive_depth = 50;
46 static int aggressive_window = 250;
47 static int gc_auto_threshold = 6700;
48 static int gc_auto_pack_limit = 50;
49 static int detach_auto = 1;
50 static timestamp_t gc_log_expire_time;
51 static const char *gc_log_expire = "1.day.ago";
52 static const char *prune_expire = "2.weeks.ago";
53 static const char *prune_worktrees_expire = "3.months.ago";
54 static unsigned long big_pack_threshold;
55 static unsigned long max_delta_cache_size = DEFAULT_DELTA_CACHE_SIZE;
56
57 static struct strvec reflog = STRVEC_INIT;
58 static struct strvec repack = STRVEC_INIT;
59 static struct strvec prune = STRVEC_INIT;
60 static struct strvec prune_worktrees = STRVEC_INIT;
61 static struct strvec rerere = STRVEC_INIT;
62
63 static struct tempfile *pidfile;
64 static struct lock_file log_lock;
65
66 static struct string_list pack_garbage = STRING_LIST_INIT_DUP;
67
68 static void clean_pack_garbage(void)
69 {
70 int i;
71 for (i = 0; i < pack_garbage.nr; i++)
72 unlink_or_warn(pack_garbage.items[i].string);
73 string_list_clear(&pack_garbage, 0);
74 }
75
76 static void report_pack_garbage(unsigned seen_bits, const char *path)
77 {
78 if (seen_bits == PACKDIR_FILE_IDX)
79 string_list_append(&pack_garbage, path);
80 }
81
82 static void process_log_file(void)
83 {
84 struct stat st;
85 if (fstat(get_lock_file_fd(&log_lock), &st)) {
86 /*
87 * Perhaps there was an i/o error or another
88 * unlikely situation. Try to make a note of
89 * this in gc.log along with any existing
90 * messages.
91 */
92 int saved_errno = errno;
93 fprintf(stderr, _("Failed to fstat %s: %s"),
94 get_lock_file_path(&log_lock),
95 strerror(saved_errno));
96 fflush(stderr);
97 commit_lock_file(&log_lock);
98 errno = saved_errno;
99 } else if (st.st_size) {
100 /* There was some error recorded in the lock file */
101 commit_lock_file(&log_lock);
102 } else {
103 /* No error, clean up any old gc.log */
104 unlink(git_path("gc.log"));
105 rollback_lock_file(&log_lock);
106 }
107 }
108
109 static void process_log_file_at_exit(void)
110 {
111 fflush(stderr);
112 process_log_file();
113 }
114
115 static void process_log_file_on_signal(int signo)
116 {
117 process_log_file();
118 sigchain_pop(signo);
119 raise(signo);
120 }
121
122 static int gc_config_is_timestamp_never(const char *var)
123 {
124 const char *value;
125 timestamp_t expire;
126
127 if (!git_config_get_value(var, &value) && value) {
128 if (parse_expiry_date(value, &expire))
129 die(_("failed to parse '%s' value '%s'"), var, value);
130 return expire == 0;
131 }
132 return 0;
133 }
134
135 static void gc_config(void)
136 {
137 const char *value;
138
139 if (!git_config_get_value("gc.packrefs", &value)) {
140 if (value && !strcmp(value, "notbare"))
141 pack_refs = -1;
142 else
143 pack_refs = git_config_bool("gc.packrefs", value);
144 }
145
146 if (gc_config_is_timestamp_never("gc.reflogexpire") &&
147 gc_config_is_timestamp_never("gc.reflogexpireunreachable"))
148 prune_reflogs = 0;
149
150 git_config_get_int("gc.aggressivewindow", &aggressive_window);
151 git_config_get_int("gc.aggressivedepth", &aggressive_depth);
152 git_config_get_int("gc.auto", &gc_auto_threshold);
153 git_config_get_int("gc.autopacklimit", &gc_auto_pack_limit);
154 git_config_get_bool("gc.autodetach", &detach_auto);
155 git_config_get_expiry("gc.pruneexpire", &prune_expire);
156 git_config_get_expiry("gc.worktreepruneexpire", &prune_worktrees_expire);
157 git_config_get_expiry("gc.logexpiry", &gc_log_expire);
158
159 git_config_get_ulong("gc.bigpackthreshold", &big_pack_threshold);
160 git_config_get_ulong("pack.deltacachesize", &max_delta_cache_size);
161
162 git_config(git_default_config, NULL);
163 }
164
165 struct maintenance_run_opts;
166 static int maintenance_task_pack_refs(MAYBE_UNUSED struct maintenance_run_opts *opts)
167 {
168 struct strvec pack_refs_cmd = STRVEC_INIT;
169 strvec_pushl(&pack_refs_cmd, "pack-refs", "--all", "--prune", NULL);
170
171 return run_command_v_opt(pack_refs_cmd.v, RUN_GIT_CMD);
172 }
173
174 static int too_many_loose_objects(void)
175 {
176 /*
177 * Quickly check if a "gc" is needed, by estimating how
178 * many loose objects there are. Because SHA-1 is evenly
179 * distributed, we can check only one and get a reasonable
180 * estimate.
181 */
182 DIR *dir;
183 struct dirent *ent;
184 int auto_threshold;
185 int num_loose = 0;
186 int needed = 0;
187 const unsigned hexsz_loose = the_hash_algo->hexsz - 2;
188
189 dir = opendir(git_path("objects/17"));
190 if (!dir)
191 return 0;
192
193 auto_threshold = DIV_ROUND_UP(gc_auto_threshold, 256);
194 while ((ent = readdir(dir)) != NULL) {
195 if (strspn(ent->d_name, "0123456789abcdef") != hexsz_loose ||
196 ent->d_name[hexsz_loose] != '\0')
197 continue;
198 if (++num_loose > auto_threshold) {
199 needed = 1;
200 break;
201 }
202 }
203 closedir(dir);
204 return needed;
205 }
206
207 static struct packed_git *find_base_packs(struct string_list *packs,
208 unsigned long limit)
209 {
210 struct packed_git *p, *base = NULL;
211
212 for (p = get_all_packs(the_repository); p; p = p->next) {
213 if (!p->pack_local)
214 continue;
215 if (limit) {
216 if (p->pack_size >= limit)
217 string_list_append(packs, p->pack_name);
218 } else if (!base || base->pack_size < p->pack_size) {
219 base = p;
220 }
221 }
222
223 if (base)
224 string_list_append(packs, base->pack_name);
225
226 return base;
227 }
228
229 static int too_many_packs(void)
230 {
231 struct packed_git *p;
232 int cnt;
233
234 if (gc_auto_pack_limit <= 0)
235 return 0;
236
237 for (cnt = 0, p = get_all_packs(the_repository); p; p = p->next) {
238 if (!p->pack_local)
239 continue;
240 if (p->pack_keep)
241 continue;
242 /*
243 * Perhaps check the size of the pack and count only
244 * very small ones here?
245 */
246 cnt++;
247 }
248 return gc_auto_pack_limit < cnt;
249 }
250
251 static uint64_t total_ram(void)
252 {
253 #if defined(HAVE_SYSINFO)
254 struct sysinfo si;
255
256 if (!sysinfo(&si))
257 return si.totalram;
258 #elif defined(HAVE_BSD_SYSCTL) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM))
259 int64_t physical_memory;
260 int mib[2];
261 size_t length;
262
263 mib[0] = CTL_HW;
264 # if defined(HW_MEMSIZE)
265 mib[1] = HW_MEMSIZE;
266 # else
267 mib[1] = HW_PHYSMEM;
268 # endif
269 length = sizeof(int64_t);
270 if (!sysctl(mib, 2, &physical_memory, &length, NULL, 0))
271 return physical_memory;
272 #elif defined(GIT_WINDOWS_NATIVE)
273 MEMORYSTATUSEX memInfo;
274
275 memInfo.dwLength = sizeof(MEMORYSTATUSEX);
276 if (GlobalMemoryStatusEx(&memInfo))
277 return memInfo.ullTotalPhys;
278 #endif
279 return 0;
280 }
281
282 static uint64_t estimate_repack_memory(struct packed_git *pack)
283 {
284 unsigned long nr_objects = approximate_object_count();
285 size_t os_cache, heap;
286
287 if (!pack || !nr_objects)
288 return 0;
289
290 /*
291 * First we have to scan through at least one pack.
292 * Assume enough room in OS file cache to keep the entire pack
293 * or we may accidentally evict data of other processes from
294 * the cache.
295 */
296 os_cache = pack->pack_size + pack->index_size;
297 /* then pack-objects needs lots more for book keeping */
298 heap = sizeof(struct object_entry) * nr_objects;
299 /*
300 * internal rev-list --all --objects takes up some memory too,
301 * let's say half of it is for blobs
302 */
303 heap += sizeof(struct blob) * nr_objects / 2;
304 /*
305 * and the other half is for trees (commits and tags are
306 * usually insignificant)
307 */
308 heap += sizeof(struct tree) * nr_objects / 2;
309 /* and then obj_hash[], underestimated in fact */
310 heap += sizeof(struct object *) * nr_objects;
311 /* revindex is used also */
312 heap += (sizeof(off_t) + sizeof(uint32_t)) * nr_objects;
313 /*
314 * read_sha1_file() (either at delta calculation phase, or
315 * writing phase) also fills up the delta base cache
316 */
317 heap += delta_base_cache_limit;
318 /* and of course pack-objects has its own delta cache */
319 heap += max_delta_cache_size;
320
321 return os_cache + heap;
322 }
323
324 static int keep_one_pack(struct string_list_item *item, void *data)
325 {
326 strvec_pushf(&repack, "--keep-pack=%s", basename(item->string));
327 return 0;
328 }
329
330 static void add_repack_all_option(struct string_list *keep_pack)
331 {
332 if (prune_expire && !strcmp(prune_expire, "now"))
333 strvec_push(&repack, "-a");
334 else {
335 strvec_push(&repack, "-A");
336 if (prune_expire)
337 strvec_pushf(&repack, "--unpack-unreachable=%s", prune_expire);
338 }
339
340 if (keep_pack)
341 for_each_string_list(keep_pack, keep_one_pack, NULL);
342 }
343
344 static void add_repack_incremental_option(void)
345 {
346 strvec_push(&repack, "--no-write-bitmap-index");
347 }
348
349 static int need_to_gc(void)
350 {
351 /*
352 * Setting gc.auto to 0 or negative can disable the
353 * automatic gc.
354 */
355 if (gc_auto_threshold <= 0)
356 return 0;
357
358 /*
359 * If there are too many loose objects, but not too many
360 * packs, we run "repack -d -l". If there are too many packs,
361 * we run "repack -A -d -l". Otherwise we tell the caller
362 * there is no need.
363 */
364 if (too_many_packs()) {
365 struct string_list keep_pack = STRING_LIST_INIT_NODUP;
366
367 if (big_pack_threshold) {
368 find_base_packs(&keep_pack, big_pack_threshold);
369 if (keep_pack.nr >= gc_auto_pack_limit) {
370 big_pack_threshold = 0;
371 string_list_clear(&keep_pack, 0);
372 find_base_packs(&keep_pack, 0);
373 }
374 } else {
375 struct packed_git *p = find_base_packs(&keep_pack, 0);
376 uint64_t mem_have, mem_want;
377
378 mem_have = total_ram();
379 mem_want = estimate_repack_memory(p);
380
381 /*
382 * Only allow 1/2 of memory for pack-objects, leave
383 * the rest for the OS and other processes in the
384 * system.
385 */
386 if (!mem_have || mem_want < mem_have / 2)
387 string_list_clear(&keep_pack, 0);
388 }
389
390 add_repack_all_option(&keep_pack);
391 string_list_clear(&keep_pack, 0);
392 } else if (too_many_loose_objects())
393 add_repack_incremental_option();
394 else
395 return 0;
396
397 if (run_hook_le(NULL, "pre-auto-gc", NULL))
398 return 0;
399 return 1;
400 }
401
402 /* return NULL on success, else hostname running the gc */
403 static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
404 {
405 struct lock_file lock = LOCK_INIT;
406 char my_host[HOST_NAME_MAX + 1];
407 struct strbuf sb = STRBUF_INIT;
408 struct stat st;
409 uintmax_t pid;
410 FILE *fp;
411 int fd;
412 char *pidfile_path;
413
414 if (is_tempfile_active(pidfile))
415 /* already locked */
416 return NULL;
417
418 if (xgethostname(my_host, sizeof(my_host)))
419 xsnprintf(my_host, sizeof(my_host), "unknown");
420
421 pidfile_path = git_pathdup("gc.pid");
422 fd = hold_lock_file_for_update(&lock, pidfile_path,
423 LOCK_DIE_ON_ERROR);
424 if (!force) {
425 static char locking_host[HOST_NAME_MAX + 1];
426 static char *scan_fmt;
427 int should_exit;
428
429 if (!scan_fmt)
430 scan_fmt = xstrfmt("%s %%%ds", "%"SCNuMAX, HOST_NAME_MAX);
431 fp = fopen(pidfile_path, "r");
432 memset(locking_host, 0, sizeof(locking_host));
433 should_exit =
434 fp != NULL &&
435 !fstat(fileno(fp), &st) &&
436 /*
437 * 12 hour limit is very generous as gc should
438 * never take that long. On the other hand we
439 * don't really need a strict limit here,
440 * running gc --auto one day late is not a big
441 * problem. --force can be used in manual gc
442 * after the user verifies that no gc is
443 * running.
444 */
445 time(NULL) - st.st_mtime <= 12 * 3600 &&
446 fscanf(fp, scan_fmt, &pid, locking_host) == 2 &&
447 /* be gentle to concurrent "gc" on remote hosts */
448 (strcmp(locking_host, my_host) || !kill(pid, 0) || errno == EPERM);
449 if (fp != NULL)
450 fclose(fp);
451 if (should_exit) {
452 if (fd >= 0)
453 rollback_lock_file(&lock);
454 *ret_pid = pid;
455 free(pidfile_path);
456 return locking_host;
457 }
458 }
459
460 strbuf_addf(&sb, "%"PRIuMAX" %s",
461 (uintmax_t) getpid(), my_host);
462 write_in_full(fd, sb.buf, sb.len);
463 strbuf_release(&sb);
464 commit_lock_file(&lock);
465 pidfile = register_tempfile(pidfile_path);
466 free(pidfile_path);
467 return NULL;
468 }
469
470 /*
471 * Returns 0 if there was no previous error and gc can proceed, 1 if
472 * gc should not proceed due to an error in the last run. Prints a
473 * message and returns with a non-[01] status code if an error occurred
474 * while reading gc.log
475 */
476 static int report_last_gc_error(void)
477 {
478 struct strbuf sb = STRBUF_INIT;
479 int ret = 0;
480 ssize_t len;
481 struct stat st;
482 char *gc_log_path = git_pathdup("gc.log");
483
484 if (stat(gc_log_path, &st)) {
485 if (errno == ENOENT)
486 goto done;
487
488 ret = die_message_errno(_("cannot stat '%s'"), gc_log_path);
489 goto done;
490 }
491
492 if (st.st_mtime < gc_log_expire_time)
493 goto done;
494
495 len = strbuf_read_file(&sb, gc_log_path, 0);
496 if (len < 0)
497 ret = die_message_errno(_("cannot read '%s'"), gc_log_path);
498 else if (len > 0) {
499 /*
500 * A previous gc failed. Report the error, and don't
501 * bother with an automatic gc run since it is likely
502 * to fail in the same way.
503 */
504 warning(_("The last gc run reported the following. "
505 "Please correct the root cause\n"
506 "and remove %s\n"
507 "Automatic cleanup will not be performed "
508 "until the file is removed.\n\n"
509 "%s"),
510 gc_log_path, sb.buf);
511 ret = 1;
512 }
513 strbuf_release(&sb);
514 done:
515 free(gc_log_path);
516 return ret;
517 }
518
519 static void gc_before_repack(void)
520 {
521 /*
522 * We may be called twice, as both the pre- and
523 * post-daemonized phases will call us, but running these
524 * commands more than once is pointless and wasteful.
525 */
526 static int done = 0;
527 if (done++)
528 return;
529
530 if (pack_refs && maintenance_task_pack_refs(NULL))
531 die(FAILED_RUN, "pack-refs");
532
533 if (prune_reflogs && run_command_v_opt(reflog.v, RUN_GIT_CMD))
534 die(FAILED_RUN, reflog.v[0]);
535 }
536
537 int cmd_gc(int argc, const char **argv, const char *prefix)
538 {
539 int aggressive = 0;
540 int auto_gc = 0;
541 int quiet = 0;
542 int force = 0;
543 const char *name;
544 pid_t pid;
545 int daemonized = 0;
546 int keep_largest_pack = -1;
547 timestamp_t dummy;
548
549 struct option builtin_gc_options[] = {
550 OPT__QUIET(&quiet, N_("suppress progress reporting")),
551 { OPTION_STRING, 0, "prune", &prune_expire, N_("date"),
552 N_("prune unreferenced objects"),
553 PARSE_OPT_OPTARG, NULL, (intptr_t)prune_expire },
554 OPT_BOOL(0, "aggressive", &aggressive, N_("be more thorough (increased runtime)")),
555 OPT_BOOL_F(0, "auto", &auto_gc, N_("enable auto-gc mode"),
556 PARSE_OPT_NOCOMPLETE),
557 OPT_BOOL_F(0, "force", &force,
558 N_("force running gc even if there may be another gc running"),
559 PARSE_OPT_NOCOMPLETE),
560 OPT_BOOL(0, "keep-largest-pack", &keep_largest_pack,
561 N_("repack all other packs except the largest pack")),
562 OPT_END()
563 };
564
565 if (argc == 2 && !strcmp(argv[1], "-h"))
566 usage_with_options(builtin_gc_usage, builtin_gc_options);
567
568 strvec_pushl(&reflog, "reflog", "expire", "--all", NULL);
569 strvec_pushl(&repack, "repack", "-d", "-l", NULL);
570 strvec_pushl(&prune, "prune", "--expire", NULL);
571 strvec_pushl(&prune_worktrees, "worktree", "prune", "--expire", NULL);
572 strvec_pushl(&rerere, "rerere", "gc", NULL);
573
574 /* default expiry time, overwritten in gc_config */
575 gc_config();
576 if (parse_expiry_date(gc_log_expire, &gc_log_expire_time))
577 die(_("failed to parse gc.logexpiry value %s"), gc_log_expire);
578
579 if (pack_refs < 0)
580 pack_refs = !is_bare_repository();
581
582 argc = parse_options(argc, argv, prefix, builtin_gc_options,
583 builtin_gc_usage, 0);
584 if (argc > 0)
585 usage_with_options(builtin_gc_usage, builtin_gc_options);
586
587 if (prune_expire && parse_expiry_date(prune_expire, &dummy))
588 die(_("failed to parse prune expiry value %s"), prune_expire);
589
590 if (aggressive) {
591 strvec_push(&repack, "-f");
592 if (aggressive_depth > 0)
593 strvec_pushf(&repack, "--depth=%d", aggressive_depth);
594 if (aggressive_window > 0)
595 strvec_pushf(&repack, "--window=%d", aggressive_window);
596 }
597 if (quiet)
598 strvec_push(&repack, "-q");
599
600 if (auto_gc) {
601 /*
602 * Auto-gc should be least intrusive as possible.
603 */
604 if (!need_to_gc())
605 return 0;
606 if (!quiet) {
607 if (detach_auto)
608 fprintf(stderr, _("Auto packing the repository in background for optimum performance.\n"));
609 else
610 fprintf(stderr, _("Auto packing the repository for optimum performance.\n"));
611 fprintf(stderr, _("See \"git help gc\" for manual housekeeping.\n"));
612 }
613 if (detach_auto) {
614 int ret = report_last_gc_error();
615
616 if (ret == 1)
617 /* Last gc --auto failed. Skip this one. */
618 return 0;
619 else if (ret)
620 /* an I/O error occurred, already reported */
621 return ret;
622
623 if (lock_repo_for_gc(force, &pid))
624 return 0;
625 gc_before_repack(); /* dies on failure */
626 delete_tempfile(&pidfile);
627
628 /*
629 * failure to daemonize is ok, we'll continue
630 * in foreground
631 */
632 daemonized = !daemonize();
633 }
634 } else {
635 struct string_list keep_pack = STRING_LIST_INIT_NODUP;
636
637 if (keep_largest_pack != -1) {
638 if (keep_largest_pack)
639 find_base_packs(&keep_pack, 0);
640 } else if (big_pack_threshold) {
641 find_base_packs(&keep_pack, big_pack_threshold);
642 }
643
644 add_repack_all_option(&keep_pack);
645 string_list_clear(&keep_pack, 0);
646 }
647
648 name = lock_repo_for_gc(force, &pid);
649 if (name) {
650 if (auto_gc)
651 return 0; /* be quiet on --auto */
652 die(_("gc is already running on machine '%s' pid %"PRIuMAX" (use --force if not)"),
653 name, (uintmax_t)pid);
654 }
655
656 if (daemonized) {
657 hold_lock_file_for_update(&log_lock,
658 git_path("gc.log"),
659 LOCK_DIE_ON_ERROR);
660 dup2(get_lock_file_fd(&log_lock), 2);
661 sigchain_push_common(process_log_file_on_signal);
662 atexit(process_log_file_at_exit);
663 }
664
665 gc_before_repack();
666
667 if (!repository_format_precious_objects) {
668 if (run_command_v_opt(repack.v,
669 RUN_GIT_CMD | RUN_CLOSE_OBJECT_STORE))
670 die(FAILED_RUN, repack.v[0]);
671
672 if (prune_expire) {
673 strvec_push(&prune, prune_expire);
674 if (quiet)
675 strvec_push(&prune, "--no-progress");
676 if (has_promisor_remote())
677 strvec_push(&prune,
678 "--exclude-promisor-objects");
679 if (run_command_v_opt(prune.v, RUN_GIT_CMD))
680 die(FAILED_RUN, prune.v[0]);
681 }
682 }
683
684 if (prune_worktrees_expire) {
685 strvec_push(&prune_worktrees, prune_worktrees_expire);
686 if (run_command_v_opt(prune_worktrees.v, RUN_GIT_CMD))
687 die(FAILED_RUN, prune_worktrees.v[0]);
688 }
689
690 if (run_command_v_opt(rerere.v, RUN_GIT_CMD))
691 die(FAILED_RUN, rerere.v[0]);
692
693 report_garbage = report_pack_garbage;
694 reprepare_packed_git(the_repository);
695 if (pack_garbage.nr > 0) {
696 close_object_store(the_repository->objects);
697 clean_pack_garbage();
698 }
699
700 prepare_repo_settings(the_repository);
701 if (the_repository->settings.gc_write_commit_graph == 1)
702 write_commit_graph_reachable(the_repository->objects->odb,
703 !quiet && !daemonized ? COMMIT_GRAPH_WRITE_PROGRESS : 0,
704 NULL);
705
706 if (auto_gc && too_many_loose_objects())
707 warning(_("There are too many unreachable loose objects; "
708 "run 'git prune' to remove them."));
709
710 if (!daemonized)
711 unlink(git_path("gc.log"));
712
713 return 0;
714 }
715
716 static const char *const builtin_maintenance_run_usage[] = {
717 N_("git maintenance run [--auto] [--[no-]quiet] [--task=<task>] [--schedule]"),
718 NULL
719 };
720
721 enum schedule_priority {
722 SCHEDULE_NONE = 0,
723 SCHEDULE_WEEKLY = 1,
724 SCHEDULE_DAILY = 2,
725 SCHEDULE_HOURLY = 3,
726 };
727
728 static enum schedule_priority parse_schedule(const char *value)
729 {
730 if (!value)
731 return SCHEDULE_NONE;
732 if (!strcasecmp(value, "hourly"))
733 return SCHEDULE_HOURLY;
734 if (!strcasecmp(value, "daily"))
735 return SCHEDULE_DAILY;
736 if (!strcasecmp(value, "weekly"))
737 return SCHEDULE_WEEKLY;
738 return SCHEDULE_NONE;
739 }
740
741 static int maintenance_opt_schedule(const struct option *opt, const char *arg,
742 int unset)
743 {
744 enum schedule_priority *priority = opt->value;
745
746 if (unset)
747 die(_("--no-schedule is not allowed"));
748
749 *priority = parse_schedule(arg);
750
751 if (!*priority)
752 die(_("unrecognized --schedule argument '%s'"), arg);
753
754 return 0;
755 }
756
757 struct maintenance_run_opts {
758 int auto_flag;
759 int quiet;
760 enum schedule_priority schedule;
761 };
762
763 /* Remember to update object flag allocation in object.h */
764 #define SEEN (1u<<0)
765
766 struct cg_auto_data {
767 int num_not_in_graph;
768 int limit;
769 };
770
771 static int dfs_on_ref(const char *refname,
772 const struct object_id *oid, int flags,
773 void *cb_data)
774 {
775 struct cg_auto_data *data = (struct cg_auto_data *)cb_data;
776 int result = 0;
777 struct object_id peeled;
778 struct commit_list *stack = NULL;
779 struct commit *commit;
780
781 if (!peel_iterated_oid(oid, &peeled))
782 oid = &peeled;
783 if (oid_object_info(the_repository, oid, NULL) != OBJ_COMMIT)
784 return 0;
785
786 commit = lookup_commit(the_repository, oid);
787 if (!commit)
788 return 0;
789 if (parse_commit(commit) ||
790 commit_graph_position(commit) != COMMIT_NOT_FROM_GRAPH)
791 return 0;
792
793 data->num_not_in_graph++;
794
795 if (data->num_not_in_graph >= data->limit)
796 return 1;
797
798 commit_list_append(commit, &stack);
799
800 while (!result && stack) {
801 struct commit_list *parent;
802
803 commit = pop_commit(&stack);
804
805 for (parent = commit->parents; parent; parent = parent->next) {
806 if (parse_commit(parent->item) ||
807 commit_graph_position(parent->item) != COMMIT_NOT_FROM_GRAPH ||
808 parent->item->object.flags & SEEN)
809 continue;
810
811 parent->item->object.flags |= SEEN;
812 data->num_not_in_graph++;
813
814 if (data->num_not_in_graph >= data->limit) {
815 result = 1;
816 break;
817 }
818
819 commit_list_append(parent->item, &stack);
820 }
821 }
822
823 free_commit_list(stack);
824 return result;
825 }
826
827 static int should_write_commit_graph(void)
828 {
829 int result;
830 struct cg_auto_data data;
831
832 data.num_not_in_graph = 0;
833 data.limit = 100;
834 git_config_get_int("maintenance.commit-graph.auto",
835 &data.limit);
836
837 if (!data.limit)
838 return 0;
839 if (data.limit < 0)
840 return 1;
841
842 result = for_each_ref(dfs_on_ref, &data);
843
844 repo_clear_commit_marks(the_repository, SEEN);
845
846 return result;
847 }
848
849 static int run_write_commit_graph(struct maintenance_run_opts *opts)
850 {
851 struct child_process child = CHILD_PROCESS_INIT;
852
853 child.git_cmd = child.close_object_store = 1;
854 strvec_pushl(&child.args, "commit-graph", "write",
855 "--split", "--reachable", NULL);
856
857 if (opts->quiet)
858 strvec_push(&child.args, "--no-progress");
859
860 return !!run_command(&child);
861 }
862
863 static int maintenance_task_commit_graph(struct maintenance_run_opts *opts)
864 {
865 prepare_repo_settings(the_repository);
866 if (!the_repository->settings.core_commit_graph)
867 return 0;
868
869 if (run_write_commit_graph(opts)) {
870 error(_("failed to write commit-graph"));
871 return 1;
872 }
873
874 return 0;
875 }
876
877 static int fetch_remote(struct remote *remote, void *cbdata)
878 {
879 struct maintenance_run_opts *opts = cbdata;
880 struct child_process child = CHILD_PROCESS_INIT;
881
882 if (remote->skip_default_update)
883 return 0;
884
885 child.git_cmd = 1;
886 strvec_pushl(&child.args, "fetch", remote->name,
887 "--prefetch", "--prune", "--no-tags",
888 "--no-write-fetch-head", "--recurse-submodules=no",
889 NULL);
890
891 if (opts->quiet)
892 strvec_push(&child.args, "--quiet");
893
894 return !!run_command(&child);
895 }
896
897 static int maintenance_task_prefetch(struct maintenance_run_opts *opts)
898 {
899 git_config_set_multivar_gently("log.excludedecoration",
900 "refs/prefetch/",
901 "refs/prefetch/",
902 CONFIG_FLAGS_FIXED_VALUE |
903 CONFIG_FLAGS_MULTI_REPLACE);
904
905 if (for_each_remote(fetch_remote, opts)) {
906 error(_("failed to prefetch remotes"));
907 return 1;
908 }
909
910 return 0;
911 }
912
913 static int maintenance_task_gc(struct maintenance_run_opts *opts)
914 {
915 struct child_process child = CHILD_PROCESS_INIT;
916
917 child.git_cmd = child.close_object_store = 1;
918 strvec_push(&child.args, "gc");
919
920 if (opts->auto_flag)
921 strvec_push(&child.args, "--auto");
922 if (opts->quiet)
923 strvec_push(&child.args, "--quiet");
924 else
925 strvec_push(&child.args, "--no-quiet");
926
927 return run_command(&child);
928 }
929
930 static int prune_packed(struct maintenance_run_opts *opts)
931 {
932 struct child_process child = CHILD_PROCESS_INIT;
933
934 child.git_cmd = 1;
935 strvec_push(&child.args, "prune-packed");
936
937 if (opts->quiet)
938 strvec_push(&child.args, "--quiet");
939
940 return !!run_command(&child);
941 }
942
943 struct write_loose_object_data {
944 FILE *in;
945 int count;
946 int batch_size;
947 };
948
949 static int loose_object_auto_limit = 100;
950
951 static int loose_object_count(const struct object_id *oid,
952 const char *path,
953 void *data)
954 {
955 int *count = (int*)data;
956 if (++(*count) >= loose_object_auto_limit)
957 return 1;
958 return 0;
959 }
960
961 static int loose_object_auto_condition(void)
962 {
963 int count = 0;
964
965 git_config_get_int("maintenance.loose-objects.auto",
966 &loose_object_auto_limit);
967
968 if (!loose_object_auto_limit)
969 return 0;
970 if (loose_object_auto_limit < 0)
971 return 1;
972
973 return for_each_loose_file_in_objdir(the_repository->objects->odb->path,
974 loose_object_count,
975 NULL, NULL, &count);
976 }
977
978 static int bail_on_loose(const struct object_id *oid,
979 const char *path,
980 void *data)
981 {
982 return 1;
983 }
984
985 static int write_loose_object_to_stdin(const struct object_id *oid,
986 const char *path,
987 void *data)
988 {
989 struct write_loose_object_data *d = (struct write_loose_object_data *)data;
990
991 fprintf(d->in, "%s\n", oid_to_hex(oid));
992
993 return ++(d->count) > d->batch_size;
994 }
995
996 static int pack_loose(struct maintenance_run_opts *opts)
997 {
998 struct repository *r = the_repository;
999 int result = 0;
1000 struct write_loose_object_data data;
1001 struct child_process pack_proc = CHILD_PROCESS_INIT;
1002
1003 /*
1004 * Do not start pack-objects process
1005 * if there are no loose objects.
1006 */
1007 if (!for_each_loose_file_in_objdir(r->objects->odb->path,
1008 bail_on_loose,
1009 NULL, NULL, NULL))
1010 return 0;
1011
1012 pack_proc.git_cmd = 1;
1013
1014 strvec_push(&pack_proc.args, "pack-objects");
1015 if (opts->quiet)
1016 strvec_push(&pack_proc.args, "--quiet");
1017 strvec_pushf(&pack_proc.args, "%s/pack/loose", r->objects->odb->path);
1018
1019 pack_proc.in = -1;
1020
1021 if (start_command(&pack_proc)) {
1022 error(_("failed to start 'git pack-objects' process"));
1023 return 1;
1024 }
1025
1026 data.in = xfdopen(pack_proc.in, "w");
1027 data.count = 0;
1028 data.batch_size = 50000;
1029
1030 for_each_loose_file_in_objdir(r->objects->odb->path,
1031 write_loose_object_to_stdin,
1032 NULL,
1033 NULL,
1034 &data);
1035
1036 fclose(data.in);
1037
1038 if (finish_command(&pack_proc)) {
1039 error(_("failed to finish 'git pack-objects' process"));
1040 result = 1;
1041 }
1042
1043 return result;
1044 }
1045
1046 static int maintenance_task_loose_objects(struct maintenance_run_opts *opts)
1047 {
1048 return prune_packed(opts) || pack_loose(opts);
1049 }
1050
1051 static int incremental_repack_auto_condition(void)
1052 {
1053 struct packed_git *p;
1054 int incremental_repack_auto_limit = 10;
1055 int count = 0;
1056
1057 prepare_repo_settings(the_repository);
1058 if (!the_repository->settings.core_multi_pack_index)
1059 return 0;
1060
1061 git_config_get_int("maintenance.incremental-repack.auto",
1062 &incremental_repack_auto_limit);
1063
1064 if (!incremental_repack_auto_limit)
1065 return 0;
1066 if (incremental_repack_auto_limit < 0)
1067 return 1;
1068
1069 for (p = get_packed_git(the_repository);
1070 count < incremental_repack_auto_limit && p;
1071 p = p->next) {
1072 if (!p->multi_pack_index)
1073 count++;
1074 }
1075
1076 return count >= incremental_repack_auto_limit;
1077 }
1078
1079 static int multi_pack_index_write(struct maintenance_run_opts *opts)
1080 {
1081 struct child_process child = CHILD_PROCESS_INIT;
1082
1083 child.git_cmd = 1;
1084 strvec_pushl(&child.args, "multi-pack-index", "write", NULL);
1085
1086 if (opts->quiet)
1087 strvec_push(&child.args, "--no-progress");
1088
1089 if (run_command(&child))
1090 return error(_("failed to write multi-pack-index"));
1091
1092 return 0;
1093 }
1094
1095 static int multi_pack_index_expire(struct maintenance_run_opts *opts)
1096 {
1097 struct child_process child = CHILD_PROCESS_INIT;
1098
1099 child.git_cmd = child.close_object_store = 1;
1100 strvec_pushl(&child.args, "multi-pack-index", "expire", NULL);
1101
1102 if (opts->quiet)
1103 strvec_push(&child.args, "--no-progress");
1104
1105 if (run_command(&child))
1106 return error(_("'git multi-pack-index expire' failed"));
1107
1108 return 0;
1109 }
1110
1111 #define TWO_GIGABYTES (INT32_MAX)
1112
1113 static off_t get_auto_pack_size(void)
1114 {
1115 /*
1116 * The "auto" value is special: we optimize for
1117 * one large pack-file (i.e. from a clone) and
1118 * expect the rest to be small and they can be
1119 * repacked quickly.
1120 *
1121 * The strategy we select here is to select a
1122 * size that is one more than the second largest
1123 * pack-file. This ensures that we will repack
1124 * at least two packs if there are three or more
1125 * packs.
1126 */
1127 off_t max_size = 0;
1128 off_t second_largest_size = 0;
1129 off_t result_size;
1130 struct packed_git *p;
1131 struct repository *r = the_repository;
1132
1133 reprepare_packed_git(r);
1134 for (p = get_all_packs(r); p; p = p->next) {
1135 if (p->pack_size > max_size) {
1136 second_largest_size = max_size;
1137 max_size = p->pack_size;
1138 } else if (p->pack_size > second_largest_size)
1139 second_largest_size = p->pack_size;
1140 }
1141
1142 result_size = second_largest_size + 1;
1143
1144 /* But limit ourselves to a batch size of 2g */
1145 if (result_size > TWO_GIGABYTES)
1146 result_size = TWO_GIGABYTES;
1147
1148 return result_size;
1149 }
1150
1151 static int multi_pack_index_repack(struct maintenance_run_opts *opts)
1152 {
1153 struct child_process child = CHILD_PROCESS_INIT;
1154
1155 child.git_cmd = child.close_object_store = 1;
1156 strvec_pushl(&child.args, "multi-pack-index", "repack", NULL);
1157
1158 if (opts->quiet)
1159 strvec_push(&child.args, "--no-progress");
1160
1161 strvec_pushf(&child.args, "--batch-size=%"PRIuMAX,
1162 (uintmax_t)get_auto_pack_size());
1163
1164 if (run_command(&child))
1165 return error(_("'git multi-pack-index repack' failed"));
1166
1167 return 0;
1168 }
1169
1170 static int maintenance_task_incremental_repack(struct maintenance_run_opts *opts)
1171 {
1172 prepare_repo_settings(the_repository);
1173 if (!the_repository->settings.core_multi_pack_index) {
1174 warning(_("skipping incremental-repack task because core.multiPackIndex is disabled"));
1175 return 0;
1176 }
1177
1178 if (multi_pack_index_write(opts))
1179 return 1;
1180 if (multi_pack_index_expire(opts))
1181 return 1;
1182 if (multi_pack_index_repack(opts))
1183 return 1;
1184 return 0;
1185 }
1186
1187 typedef int maintenance_task_fn(struct maintenance_run_opts *opts);
1188
1189 /*
1190 * An auto condition function returns 1 if the task should run
1191 * and 0 if the task should NOT run. See needs_to_gc() for an
1192 * example.
1193 */
1194 typedef int maintenance_auto_fn(void);
1195
1196 struct maintenance_task {
1197 const char *name;
1198 maintenance_task_fn *fn;
1199 maintenance_auto_fn *auto_condition;
1200 unsigned enabled:1;
1201
1202 enum schedule_priority schedule;
1203
1204 /* -1 if not selected. */
1205 int selected_order;
1206 };
1207
1208 enum maintenance_task_label {
1209 TASK_PREFETCH,
1210 TASK_LOOSE_OBJECTS,
1211 TASK_INCREMENTAL_REPACK,
1212 TASK_GC,
1213 TASK_COMMIT_GRAPH,
1214 TASK_PACK_REFS,
1215
1216 /* Leave as final value */
1217 TASK__COUNT
1218 };
1219
1220 static struct maintenance_task tasks[] = {
1221 [TASK_PREFETCH] = {
1222 "prefetch",
1223 maintenance_task_prefetch,
1224 },
1225 [TASK_LOOSE_OBJECTS] = {
1226 "loose-objects",
1227 maintenance_task_loose_objects,
1228 loose_object_auto_condition,
1229 },
1230 [TASK_INCREMENTAL_REPACK] = {
1231 "incremental-repack",
1232 maintenance_task_incremental_repack,
1233 incremental_repack_auto_condition,
1234 },
1235 [TASK_GC] = {
1236 "gc",
1237 maintenance_task_gc,
1238 need_to_gc,
1239 1,
1240 },
1241 [TASK_COMMIT_GRAPH] = {
1242 "commit-graph",
1243 maintenance_task_commit_graph,
1244 should_write_commit_graph,
1245 },
1246 [TASK_PACK_REFS] = {
1247 "pack-refs",
1248 maintenance_task_pack_refs,
1249 NULL,
1250 },
1251 };
1252
1253 static int compare_tasks_by_selection(const void *a_, const void *b_)
1254 {
1255 const struct maintenance_task *a = a_;
1256 const struct maintenance_task *b = b_;
1257
1258 return b->selected_order - a->selected_order;
1259 }
1260
1261 static int maintenance_run_tasks(struct maintenance_run_opts *opts)
1262 {
1263 int i, found_selected = 0;
1264 int result = 0;
1265 struct lock_file lk;
1266 struct repository *r = the_repository;
1267 char *lock_path = xstrfmt("%s/maintenance", r->objects->odb->path);
1268
1269 if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) {
1270 /*
1271 * Another maintenance command is running.
1272 *
1273 * If --auto was provided, then it is likely due to a
1274 * recursive process stack. Do not report an error in
1275 * that case.
1276 */
1277 if (!opts->auto_flag && !opts->quiet)
1278 warning(_("lock file '%s' exists, skipping maintenance"),
1279 lock_path);
1280 free(lock_path);
1281 return 0;
1282 }
1283 free(lock_path);
1284
1285 for (i = 0; !found_selected && i < TASK__COUNT; i++)
1286 found_selected = tasks[i].selected_order >= 0;
1287
1288 if (found_selected)
1289 QSORT(tasks, TASK__COUNT, compare_tasks_by_selection);
1290
1291 for (i = 0; i < TASK__COUNT; i++) {
1292 if (found_selected && tasks[i].selected_order < 0)
1293 continue;
1294
1295 if (!found_selected && !tasks[i].enabled)
1296 continue;
1297
1298 if (opts->auto_flag &&
1299 (!tasks[i].auto_condition ||
1300 !tasks[i].auto_condition()))
1301 continue;
1302
1303 if (opts->schedule && tasks[i].schedule < opts->schedule)
1304 continue;
1305
1306 trace2_region_enter("maintenance", tasks[i].name, r);
1307 if (tasks[i].fn(opts)) {
1308 error(_("task '%s' failed"), tasks[i].name);
1309 result = 1;
1310 }
1311 trace2_region_leave("maintenance", tasks[i].name, r);
1312 }
1313
1314 rollback_lock_file(&lk);
1315 return result;
1316 }
1317
1318 static void initialize_maintenance_strategy(void)
1319 {
1320 char *config_str;
1321
1322 if (git_config_get_string("maintenance.strategy", &config_str))
1323 return;
1324
1325 if (!strcasecmp(config_str, "incremental")) {
1326 tasks[TASK_GC].schedule = SCHEDULE_NONE;
1327 tasks[TASK_COMMIT_GRAPH].enabled = 1;
1328 tasks[TASK_COMMIT_GRAPH].schedule = SCHEDULE_HOURLY;
1329 tasks[TASK_PREFETCH].enabled = 1;
1330 tasks[TASK_PREFETCH].schedule = SCHEDULE_HOURLY;
1331 tasks[TASK_INCREMENTAL_REPACK].enabled = 1;
1332 tasks[TASK_INCREMENTAL_REPACK].schedule = SCHEDULE_DAILY;
1333 tasks[TASK_LOOSE_OBJECTS].enabled = 1;
1334 tasks[TASK_LOOSE_OBJECTS].schedule = SCHEDULE_DAILY;
1335 tasks[TASK_PACK_REFS].enabled = 1;
1336 tasks[TASK_PACK_REFS].schedule = SCHEDULE_WEEKLY;
1337 }
1338 }
1339
1340 static void initialize_task_config(int schedule)
1341 {
1342 int i;
1343 struct strbuf config_name = STRBUF_INIT;
1344 gc_config();
1345
1346 if (schedule)
1347 initialize_maintenance_strategy();
1348
1349 for (i = 0; i < TASK__COUNT; i++) {
1350 int config_value;
1351 char *config_str;
1352
1353 strbuf_reset(&config_name);
1354 strbuf_addf(&config_name, "maintenance.%s.enabled",
1355 tasks[i].name);
1356
1357 if (!git_config_get_bool(config_name.buf, &config_value))
1358 tasks[i].enabled = config_value;
1359
1360 strbuf_reset(&config_name);
1361 strbuf_addf(&config_name, "maintenance.%s.schedule",
1362 tasks[i].name);
1363
1364 if (!git_config_get_string(config_name.buf, &config_str)) {
1365 tasks[i].schedule = parse_schedule(config_str);
1366 free(config_str);
1367 }
1368 }
1369
1370 strbuf_release(&config_name);
1371 }
1372
1373 static int task_option_parse(const struct option *opt,
1374 const char *arg, int unset)
1375 {
1376 int i, num_selected = 0;
1377 struct maintenance_task *task = NULL;
1378
1379 BUG_ON_OPT_NEG(unset);
1380
1381 for (i = 0; i < TASK__COUNT; i++) {
1382 if (tasks[i].selected_order >= 0)
1383 num_selected++;
1384 if (!strcasecmp(tasks[i].name, arg)) {
1385 task = &tasks[i];
1386 }
1387 }
1388
1389 if (!task) {
1390 error(_("'%s' is not a valid task"), arg);
1391 return 1;
1392 }
1393
1394 if (task->selected_order >= 0) {
1395 error(_("task '%s' cannot be selected multiple times"), arg);
1396 return 1;
1397 }
1398
1399 task->selected_order = num_selected + 1;
1400
1401 return 0;
1402 }
1403
1404 static int maintenance_run(int argc, const char **argv, const char *prefix)
1405 {
1406 int i;
1407 struct maintenance_run_opts opts;
1408 struct option builtin_maintenance_run_options[] = {
1409 OPT_BOOL(0, "auto", &opts.auto_flag,
1410 N_("run tasks based on the state of the repository")),
1411 OPT_CALLBACK(0, "schedule", &opts.schedule, N_("frequency"),
1412 N_("run tasks based on frequency"),
1413 maintenance_opt_schedule),
1414 OPT_BOOL(0, "quiet", &opts.quiet,
1415 N_("do not report progress or other information over stderr")),
1416 OPT_CALLBACK_F(0, "task", NULL, N_("task"),
1417 N_("run a specific task"),
1418 PARSE_OPT_NONEG, task_option_parse),
1419 OPT_END()
1420 };
1421 memset(&opts, 0, sizeof(opts));
1422
1423 opts.quiet = !isatty(2);
1424
1425 for (i = 0; i < TASK__COUNT; i++)
1426 tasks[i].selected_order = -1;
1427
1428 argc = parse_options(argc, argv, prefix,
1429 builtin_maintenance_run_options,
1430 builtin_maintenance_run_usage,
1431 PARSE_OPT_STOP_AT_NON_OPTION);
1432
1433 if (opts.auto_flag && opts.schedule)
1434 die(_("use at most one of --auto and --schedule=<frequency>"));
1435
1436 initialize_task_config(opts.schedule);
1437
1438 if (argc != 0)
1439 usage_with_options(builtin_maintenance_run_usage,
1440 builtin_maintenance_run_options);
1441 return maintenance_run_tasks(&opts);
1442 }
1443
1444 static char *get_maintpath(void)
1445 {
1446 struct strbuf sb = STRBUF_INIT;
1447 const char *p = the_repository->worktree ?
1448 the_repository->worktree : the_repository->gitdir;
1449
1450 strbuf_realpath(&sb, p, 1);
1451 return strbuf_detach(&sb, NULL);
1452 }
1453
1454 static int maintenance_register(void)
1455 {
1456 int rc;
1457 char *config_value;
1458 struct child_process config_set = CHILD_PROCESS_INIT;
1459 struct child_process config_get = CHILD_PROCESS_INIT;
1460 char *maintpath = get_maintpath();
1461
1462 /* Disable foreground maintenance */
1463 git_config_set("maintenance.auto", "false");
1464
1465 /* Set maintenance strategy, if unset */
1466 if (!git_config_get_string("maintenance.strategy", &config_value))
1467 free(config_value);
1468 else
1469 git_config_set("maintenance.strategy", "incremental");
1470
1471 config_get.git_cmd = 1;
1472 strvec_pushl(&config_get.args, "config", "--global", "--get",
1473 "--fixed-value", "maintenance.repo", maintpath, NULL);
1474 config_get.out = -1;
1475
1476 if (start_command(&config_get)) {
1477 rc = error(_("failed to run 'git config'"));
1478 goto done;
1479 }
1480
1481 /* We already have this value in our config! */
1482 if (!finish_command(&config_get)) {
1483 rc = 0;
1484 goto done;
1485 }
1486
1487 config_set.git_cmd = 1;
1488 strvec_pushl(&config_set.args, "config", "--add", "--global", "maintenance.repo",
1489 maintpath, NULL);
1490
1491 rc = run_command(&config_set);
1492
1493 done:
1494 free(maintpath);
1495 return rc;
1496 }
1497
1498 static int maintenance_unregister(void)
1499 {
1500 int rc;
1501 struct child_process config_unset = CHILD_PROCESS_INIT;
1502 char *maintpath = get_maintpath();
1503
1504 config_unset.git_cmd = 1;
1505 strvec_pushl(&config_unset.args, "config", "--global", "--unset",
1506 "--fixed-value", "maintenance.repo", maintpath, NULL);
1507
1508 rc = run_command(&config_unset);
1509 free(maintpath);
1510 return rc;
1511 }
1512
1513 static const char *get_frequency(enum schedule_priority schedule)
1514 {
1515 switch (schedule) {
1516 case SCHEDULE_HOURLY:
1517 return "hourly";
1518 case SCHEDULE_DAILY:
1519 return "daily";
1520 case SCHEDULE_WEEKLY:
1521 return "weekly";
1522 default:
1523 BUG("invalid schedule %d", schedule);
1524 }
1525 }
1526
1527 /*
1528 * get_schedule_cmd` reads the GIT_TEST_MAINT_SCHEDULER environment variable
1529 * to mock the schedulers that `git maintenance start` rely on.
1530 *
1531 * For test purpose, GIT_TEST_MAINT_SCHEDULER can be set to a comma-separated
1532 * list of colon-separated key/value pairs where each pair contains a scheduler
1533 * and its corresponding mock.
1534 *
1535 * * If $GIT_TEST_MAINT_SCHEDULER is not set, return false and leave the
1536 * arguments unmodified.
1537 *
1538 * * If $GIT_TEST_MAINT_SCHEDULER is set, return true.
1539 * In this case, the *cmd value is read as input.
1540 *
1541 * * if the input value *cmd is the key of one of the comma-separated list
1542 * item, then *is_available is set to true and *cmd is modified and becomes
1543 * the mock command.
1544 *
1545 * * if the input value *cmd isn’t the key of any of the comma-separated list
1546 * item, then *is_available is set to false.
1547 *
1548 * Ex.:
1549 * GIT_TEST_MAINT_SCHEDULER not set
1550 * +-------+-------------------------------------------------+
1551 * | Input | Output |
1552 * | *cmd | return code | *cmd | *is_available |
1553 * +-------+-------------+-------------------+---------------+
1554 * | "foo" | false | "foo" (unchanged) | (unchanged) |
1555 * +-------+-------------+-------------------+---------------+
1556 *
1557 * GIT_TEST_MAINT_SCHEDULER set to “foo:./mock_foo.sh,bar:./mock_bar.sh”
1558 * +-------+-------------------------------------------------+
1559 * | Input | Output |
1560 * | *cmd | return code | *cmd | *is_available |
1561 * +-------+-------------+-------------------+---------------+
1562 * | "foo" | true | "./mock.foo.sh" | true |
1563 * | "qux" | true | "qux" (unchanged) | false |
1564 * +-------+-------------+-------------------+---------------+
1565 */
1566 static int get_schedule_cmd(const char **cmd, int *is_available)
1567 {
1568 char *testing = xstrdup_or_null(getenv("GIT_TEST_MAINT_SCHEDULER"));
1569 struct string_list_item *item;
1570 struct string_list list = STRING_LIST_INIT_NODUP;
1571
1572 if (!testing)
1573 return 0;
1574
1575 if (is_available)
1576 *is_available = 0;
1577
1578 string_list_split_in_place(&list, testing, ',', -1);
1579 for_each_string_list_item(item, &list) {
1580 struct string_list pair = STRING_LIST_INIT_NODUP;
1581
1582 if (string_list_split_in_place(&pair, item->string, ':', 2) != 2)
1583 continue;
1584
1585 if (!strcmp(*cmd, pair.items[0].string)) {
1586 *cmd = pair.items[1].string;
1587 if (is_available)
1588 *is_available = 1;
1589 string_list_clear(&list, 0);
1590 UNLEAK(testing);
1591 return 1;
1592 }
1593 }
1594
1595 string_list_clear(&list, 0);
1596 free(testing);
1597 return 1;
1598 }
1599
1600 static int is_launchctl_available(void)
1601 {
1602 const char *cmd = "launchctl";
1603 int is_available;
1604 if (get_schedule_cmd(&cmd, &is_available))
1605 return is_available;
1606
1607 #ifdef __APPLE__
1608 return 1;
1609 #else
1610 return 0;
1611 #endif
1612 }
1613
1614 static char *launchctl_service_name(const char *frequency)
1615 {
1616 struct strbuf label = STRBUF_INIT;
1617 strbuf_addf(&label, "org.git-scm.git.%s", frequency);
1618 return strbuf_detach(&label, NULL);
1619 }
1620
1621 static char *launchctl_service_filename(const char *name)
1622 {
1623 char *expanded;
1624 struct strbuf filename = STRBUF_INIT;
1625 strbuf_addf(&filename, "~/Library/LaunchAgents/%s.plist", name);
1626
1627 expanded = interpolate_path(filename.buf, 1);
1628 if (!expanded)
1629 die(_("failed to expand path '%s'"), filename.buf);
1630
1631 strbuf_release(&filename);
1632 return expanded;
1633 }
1634
1635 static char *launchctl_get_uid(void)
1636 {
1637 return xstrfmt("gui/%d", getuid());
1638 }
1639
1640 static int launchctl_boot_plist(int enable, const char *filename)
1641 {
1642 const char *cmd = "launchctl";
1643 int result;
1644 struct child_process child = CHILD_PROCESS_INIT;
1645 char *uid = launchctl_get_uid();
1646
1647 get_schedule_cmd(&cmd, NULL);
1648 strvec_split(&child.args, cmd);
1649 strvec_pushl(&child.args, enable ? "bootstrap" : "bootout", uid,
1650 filename, NULL);
1651
1652 child.no_stderr = 1;
1653 child.no_stdout = 1;
1654
1655 if (start_command(&child))
1656 die(_("failed to start launchctl"));
1657
1658 result = finish_command(&child);
1659
1660 free(uid);
1661 return result;
1662 }
1663
1664 static int launchctl_remove_plist(enum schedule_priority schedule)
1665 {
1666 const char *frequency = get_frequency(schedule);
1667 char *name = launchctl_service_name(frequency);
1668 char *filename = launchctl_service_filename(name);
1669 int result = launchctl_boot_plist(0, filename);
1670 unlink(filename);
1671 free(filename);
1672 free(name);
1673 return result;
1674 }
1675
1676 static int launchctl_remove_plists(void)
1677 {
1678 return launchctl_remove_plist(SCHEDULE_HOURLY) ||
1679 launchctl_remove_plist(SCHEDULE_DAILY) ||
1680 launchctl_remove_plist(SCHEDULE_WEEKLY);
1681 }
1682
1683 static int launchctl_list_contains_plist(const char *name, const char *cmd)
1684 {
1685 struct child_process child = CHILD_PROCESS_INIT;
1686
1687 strvec_split(&child.args, cmd);
1688 strvec_pushl(&child.args, "list", name, NULL);
1689
1690 child.no_stderr = 1;
1691 child.no_stdout = 1;
1692
1693 if (start_command(&child))
1694 die(_("failed to start launchctl"));
1695
1696 /* Returns failure if 'name' doesn't exist. */
1697 return !finish_command(&child);
1698 }
1699
1700 static int launchctl_schedule_plist(const char *exec_path, enum schedule_priority schedule)
1701 {
1702 int i, fd;
1703 const char *preamble, *repeat;
1704 const char *frequency = get_frequency(schedule);
1705 char *name = launchctl_service_name(frequency);
1706 char *filename = launchctl_service_filename(name);
1707 struct lock_file lk = LOCK_INIT;
1708 static unsigned long lock_file_timeout_ms = ULONG_MAX;
1709 struct strbuf plist = STRBUF_INIT, plist2 = STRBUF_INIT;
1710 struct stat st;
1711 const char *cmd = "launchctl";
1712
1713 get_schedule_cmd(&cmd, NULL);
1714 preamble = "<?xml version=\"1.0\"?>\n"
1715 "<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n"
1716 "<plist version=\"1.0\">"
1717 "<dict>\n"
1718 "<key>Label</key><string>%s</string>\n"
1719 "<key>ProgramArguments</key>\n"
1720 "<array>\n"
1721 "<string>%s/git</string>\n"
1722 "<string>--exec-path=%s</string>\n"
1723 "<string>for-each-repo</string>\n"
1724 "<string>--config=maintenance.repo</string>\n"
1725 "<string>maintenance</string>\n"
1726 "<string>run</string>\n"
1727 "<string>--schedule=%s</string>\n"
1728 "</array>\n"
1729 "<key>StartCalendarInterval</key>\n"
1730 "<array>\n";
1731 strbuf_addf(&plist, preamble, name, exec_path, exec_path, frequency);
1732
1733 switch (schedule) {
1734 case SCHEDULE_HOURLY:
1735 repeat = "<dict>\n"
1736 "<key>Hour</key><integer>%d</integer>\n"
1737 "<key>Minute</key><integer>0</integer>\n"
1738 "</dict>\n";
1739 for (i = 1; i <= 23; i++)
1740 strbuf_addf(&plist, repeat, i);
1741 break;
1742
1743 case SCHEDULE_DAILY:
1744 repeat = "<dict>\n"
1745 "<key>Day</key><integer>%d</integer>\n"
1746 "<key>Hour</key><integer>0</integer>\n"
1747 "<key>Minute</key><integer>0</integer>\n"
1748 "</dict>\n";
1749 for (i = 1; i <= 6; i++)
1750 strbuf_addf(&plist, repeat, i);
1751 break;
1752
1753 case SCHEDULE_WEEKLY:
1754 strbuf_addstr(&plist,
1755 "<dict>\n"
1756 "<key>Day</key><integer>0</integer>\n"
1757 "<key>Hour</key><integer>0</integer>\n"
1758 "<key>Minute</key><integer>0</integer>\n"
1759 "</dict>\n");
1760 break;
1761
1762 default:
1763 /* unreachable */
1764 break;
1765 }
1766 strbuf_addstr(&plist, "</array>\n</dict>\n</plist>\n");
1767
1768 if (safe_create_leading_directories(filename))
1769 die(_("failed to create directories for '%s'"), filename);
1770
1771 if ((long)lock_file_timeout_ms < 0 &&
1772 git_config_get_ulong("gc.launchctlplistlocktimeoutms",
1773 &lock_file_timeout_ms))
1774 lock_file_timeout_ms = 150;
1775
1776 fd = hold_lock_file_for_update_timeout(&lk, filename, LOCK_DIE_ON_ERROR,
1777 lock_file_timeout_ms);
1778
1779 /*
1780 * Does this file already exist? With the intended contents? Is it
1781 * registered already? Then it does not need to be re-registered.
1782 */
1783 if (!stat(filename, &st) && st.st_size == plist.len &&
1784 strbuf_read_file(&plist2, filename, plist.len) == plist.len &&
1785 !strbuf_cmp(&plist, &plist2) &&
1786 launchctl_list_contains_plist(name, cmd))
1787 rollback_lock_file(&lk);
1788 else {
1789 if (write_in_full(fd, plist.buf, plist.len) < 0 ||
1790 commit_lock_file(&lk))
1791 die_errno(_("could not write '%s'"), filename);
1792
1793 /* bootout might fail if not already running, so ignore */
1794 launchctl_boot_plist(0, filename);
1795 if (launchctl_boot_plist(1, filename))
1796 die(_("failed to bootstrap service %s"), filename);
1797 }
1798
1799 free(filename);
1800 free(name);
1801 strbuf_release(&plist);
1802 strbuf_release(&plist2);
1803 return 0;
1804 }
1805
1806 static int launchctl_add_plists(void)
1807 {
1808 const char *exec_path = git_exec_path();
1809
1810 return launchctl_schedule_plist(exec_path, SCHEDULE_HOURLY) ||
1811 launchctl_schedule_plist(exec_path, SCHEDULE_DAILY) ||
1812 launchctl_schedule_plist(exec_path, SCHEDULE_WEEKLY);
1813 }
1814
1815 static int launchctl_update_schedule(int run_maintenance, int fd)
1816 {
1817 if (run_maintenance)
1818 return launchctl_add_plists();
1819 else
1820 return launchctl_remove_plists();
1821 }
1822
1823 static int is_schtasks_available(void)
1824 {
1825 const char *cmd = "schtasks";
1826 int is_available;
1827 if (get_schedule_cmd(&cmd, &is_available))
1828 return is_available;
1829
1830 #ifdef GIT_WINDOWS_NATIVE
1831 return 1;
1832 #else
1833 return 0;
1834 #endif
1835 }
1836
1837 static char *schtasks_task_name(const char *frequency)
1838 {
1839 struct strbuf label = STRBUF_INIT;
1840 strbuf_addf(&label, "Git Maintenance (%s)", frequency);
1841 return strbuf_detach(&label, NULL);
1842 }
1843
1844 static int schtasks_remove_task(enum schedule_priority schedule)
1845 {
1846 const char *cmd = "schtasks";
1847 int result;
1848 struct strvec args = STRVEC_INIT;
1849 const char *frequency = get_frequency(schedule);
1850 char *name = schtasks_task_name(frequency);
1851
1852 get_schedule_cmd(&cmd, NULL);
1853 strvec_split(&args, cmd);
1854 strvec_pushl(&args, "/delete", "/tn", name, "/f", NULL);
1855
1856 result = run_command_v_opt(args.v, 0);
1857
1858 strvec_clear(&args);
1859 free(name);
1860 return result;
1861 }
1862
1863 static int schtasks_remove_tasks(void)
1864 {
1865 return schtasks_remove_task(SCHEDULE_HOURLY) ||
1866 schtasks_remove_task(SCHEDULE_DAILY) ||
1867 schtasks_remove_task(SCHEDULE_WEEKLY);
1868 }
1869
1870 static int schtasks_schedule_task(const char *exec_path, enum schedule_priority schedule)
1871 {
1872 const char *cmd = "schtasks";
1873 int result;
1874 struct child_process child = CHILD_PROCESS_INIT;
1875 const char *xml;
1876 struct tempfile *tfile;
1877 const char *frequency = get_frequency(schedule);
1878 char *name = schtasks_task_name(frequency);
1879 struct strbuf tfilename = STRBUF_INIT;
1880
1881 get_schedule_cmd(&cmd, NULL);
1882
1883 strbuf_addf(&tfilename, "%s/schedule_%s_XXXXXX",
1884 get_git_common_dir(), frequency);
1885 tfile = xmks_tempfile(tfilename.buf);
1886 strbuf_release(&tfilename);
1887
1888 if (!fdopen_tempfile(tfile, "w"))
1889 die(_("failed to create temp xml file"));
1890
1891 xml = "<?xml version=\"1.0\" ?>\n"
1892 "<Task version=\"1.4\" xmlns=\"http://schemas.microsoft.com/windows/2004/02/mit/task\">\n"
1893 "<Triggers>\n"
1894 "<CalendarTrigger>\n";
1895 fputs(xml, tfile->fp);
1896
1897 switch (schedule) {
1898 case SCHEDULE_HOURLY:
1899 fprintf(tfile->fp,
1900 "<StartBoundary>2020-01-01T01:00:00</StartBoundary>\n"
1901 "<Enabled>true</Enabled>\n"
1902 "<ScheduleByDay>\n"
1903 "<DaysInterval>1</DaysInterval>\n"
1904 "</ScheduleByDay>\n"
1905 "<Repetition>\n"
1906 "<Interval>PT1H</Interval>\n"
1907 "<Duration>PT23H</Duration>\n"
1908 "<StopAtDurationEnd>false</StopAtDurationEnd>\n"
1909 "</Repetition>\n");
1910 break;
1911
1912 case SCHEDULE_DAILY:
1913 fprintf(tfile->fp,
1914 "<StartBoundary>2020-01-01T00:00:00</StartBoundary>\n"
1915 "<Enabled>true</Enabled>\n"
1916 "<ScheduleByWeek>\n"
1917 "<DaysOfWeek>\n"
1918 "<Monday />\n"
1919 "<Tuesday />\n"
1920 "<Wednesday />\n"
1921 "<Thursday />\n"
1922 "<Friday />\n"
1923 "<Saturday />\n"
1924 "</DaysOfWeek>\n"
1925 "<WeeksInterval>1</WeeksInterval>\n"
1926 "</ScheduleByWeek>\n");
1927 break;
1928
1929 case SCHEDULE_WEEKLY:
1930 fprintf(tfile->fp,
1931 "<StartBoundary>2020-01-01T00:00:00</StartBoundary>\n"
1932 "<Enabled>true</Enabled>\n"
1933 "<ScheduleByWeek>\n"
1934 "<DaysOfWeek>\n"
1935 "<Sunday />\n"
1936 "</DaysOfWeek>\n"
1937 "<WeeksInterval>1</WeeksInterval>\n"
1938 "</ScheduleByWeek>\n");
1939 break;
1940
1941 default:
1942 break;
1943 }
1944
1945 xml = "</CalendarTrigger>\n"
1946 "</Triggers>\n"
1947 "<Principals>\n"
1948 "<Principal id=\"Author\">\n"
1949 "<LogonType>InteractiveToken</LogonType>\n"
1950 "<RunLevel>LeastPrivilege</RunLevel>\n"
1951 "</Principal>\n"
1952 "</Principals>\n"
1953 "<Settings>\n"
1954 "<MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>\n"
1955 "<Enabled>true</Enabled>\n"
1956 "<Hidden>true</Hidden>\n"
1957 "<UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>\n"
1958 "<WakeToRun>false</WakeToRun>\n"
1959 "<ExecutionTimeLimit>PT72H</ExecutionTimeLimit>\n"
1960 "<Priority>7</Priority>\n"
1961 "</Settings>\n"
1962 "<Actions Context=\"Author\">\n"
1963 "<Exec>\n"
1964 "<Command>\"%s\\git.exe\"</Command>\n"
1965 "<Arguments>--exec-path=\"%s\" for-each-repo --config=maintenance.repo maintenance run --schedule=%s</Arguments>\n"
1966 "</Exec>\n"
1967 "</Actions>\n"
1968 "</Task>\n";
1969 fprintf(tfile->fp, xml, exec_path, exec_path, frequency);
1970 strvec_split(&child.args, cmd);
1971 strvec_pushl(&child.args, "/create", "/tn", name, "/f", "/xml",
1972 get_tempfile_path(tfile), NULL);
1973 close_tempfile_gently(tfile);
1974
1975 child.no_stdout = 1;
1976 child.no_stderr = 1;
1977
1978 if (start_command(&child))
1979 die(_("failed to start schtasks"));
1980 result = finish_command(&child);
1981
1982 delete_tempfile(&tfile);
1983 free(name);
1984 return result;
1985 }
1986
1987 static int schtasks_schedule_tasks(void)
1988 {
1989 const char *exec_path = git_exec_path();
1990
1991 return schtasks_schedule_task(exec_path, SCHEDULE_HOURLY) ||
1992 schtasks_schedule_task(exec_path, SCHEDULE_DAILY) ||
1993 schtasks_schedule_task(exec_path, SCHEDULE_WEEKLY);
1994 }
1995
1996 static int schtasks_update_schedule(int run_maintenance, int fd)
1997 {
1998 if (run_maintenance)
1999 return schtasks_schedule_tasks();
2000 else
2001 return schtasks_remove_tasks();
2002 }
2003
2004 MAYBE_UNUSED
2005 static int check_crontab_process(const char *cmd)
2006 {
2007 struct child_process child = CHILD_PROCESS_INIT;
2008
2009 strvec_split(&child.args, cmd);
2010 strvec_push(&child.args, "-l");
2011 child.no_stdin = 1;
2012 child.no_stdout = 1;
2013 child.no_stderr = 1;
2014 child.silent_exec_failure = 1;
2015
2016 if (start_command(&child))
2017 return 0;
2018 /* Ignore exit code, as an empty crontab will return error. */
2019 finish_command(&child);
2020 return 1;
2021 }
2022
2023 static int is_crontab_available(void)
2024 {
2025 const char *cmd = "crontab";
2026 int is_available;
2027
2028 if (get_schedule_cmd(&cmd, &is_available))
2029 return is_available;
2030
2031 #ifdef __APPLE__
2032 /*
2033 * macOS has cron, but it requires special permissions and will
2034 * create a UI alert when attempting to run this command.
2035 */
2036 return 0;
2037 #else
2038 return check_crontab_process(cmd);
2039 #endif
2040 }
2041
2042 #define BEGIN_LINE "# BEGIN GIT MAINTENANCE SCHEDULE"
2043 #define END_LINE "# END GIT MAINTENANCE SCHEDULE"
2044
2045 static int crontab_update_schedule(int run_maintenance, int fd)
2046 {
2047 const char *cmd = "crontab";
2048 int result = 0;
2049 int in_old_region = 0;
2050 struct child_process crontab_list = CHILD_PROCESS_INIT;
2051 struct child_process crontab_edit = CHILD_PROCESS_INIT;
2052 FILE *cron_list, *cron_in;
2053 struct strbuf line = STRBUF_INIT;
2054
2055 get_schedule_cmd(&cmd, NULL);
2056 strvec_split(&crontab_list.args, cmd);
2057 strvec_push(&crontab_list.args, "-l");
2058 crontab_list.in = -1;
2059 crontab_list.out = dup(fd);
2060 crontab_list.git_cmd = 0;
2061
2062 if (start_command(&crontab_list))
2063 return error(_("failed to run 'crontab -l'; your system might not support 'cron'"));
2064
2065 /* Ignore exit code, as an empty crontab will return error. */
2066 finish_command(&crontab_list);
2067
2068 /*
2069 * Read from the .lock file, filtering out the old
2070 * schedule while appending the new schedule.
2071 */
2072 cron_list = fdopen(fd, "r");
2073 rewind(cron_list);
2074
2075 strvec_split(&crontab_edit.args, cmd);
2076 crontab_edit.in = -1;
2077 crontab_edit.git_cmd = 0;
2078
2079 if (start_command(&crontab_edit))
2080 return error(_("failed to run 'crontab'; your system might not support 'cron'"));
2081
2082 cron_in = fdopen(crontab_edit.in, "w");
2083 if (!cron_in) {
2084 result = error(_("failed to open stdin of 'crontab'"));
2085 goto done_editing;
2086 }
2087
2088 while (!strbuf_getline_lf(&line, cron_list)) {
2089 if (!in_old_region && !strcmp(line.buf, BEGIN_LINE))
2090 in_old_region = 1;
2091 else if (in_old_region && !strcmp(line.buf, END_LINE))
2092 in_old_region = 0;
2093 else if (!in_old_region)
2094 fprintf(cron_in, "%s\n", line.buf);
2095 }
2096 strbuf_release(&line);
2097
2098 if (run_maintenance) {
2099 struct strbuf line_format = STRBUF_INIT;
2100 const char *exec_path = git_exec_path();
2101
2102 fprintf(cron_in, "%s\n", BEGIN_LINE);
2103 fprintf(cron_in,
2104 "# The following schedule was created by Git\n");
2105 fprintf(cron_in, "# Any edits made in this region might be\n");
2106 fprintf(cron_in,
2107 "# replaced in the future by a Git command.\n\n");
2108
2109 strbuf_addf(&line_format,
2110 "%%s %%s * * %%s \"%s/git\" --exec-path=\"%s\" for-each-repo --config=maintenance.repo maintenance run --schedule=%%s\n",
2111 exec_path, exec_path);
2112 fprintf(cron_in, line_format.buf, "0", "1-23", "*", "hourly");
2113 fprintf(cron_in, line_format.buf, "0", "0", "1-6", "daily");
2114 fprintf(cron_in, line_format.buf, "0", "0", "0", "weekly");
2115 strbuf_release(&line_format);
2116
2117 fprintf(cron_in, "\n%s\n", END_LINE);
2118 }
2119
2120 fflush(cron_in);
2121 fclose(cron_in);
2122 close(crontab_edit.in);
2123
2124 done_editing:
2125 if (finish_command(&crontab_edit))
2126 result = error(_("'crontab' died"));
2127 else
2128 fclose(cron_list);
2129 return result;
2130 }
2131
2132 static int real_is_systemd_timer_available(void)
2133 {
2134 struct child_process child = CHILD_PROCESS_INIT;
2135
2136 strvec_pushl(&child.args, "systemctl", "--user", "list-timers", NULL);
2137 child.no_stdin = 1;
2138 child.no_stdout = 1;
2139 child.no_stderr = 1;
2140 child.silent_exec_failure = 1;
2141
2142 if (start_command(&child))
2143 return 0;
2144 if (finish_command(&child))
2145 return 0;
2146 return 1;
2147 }
2148
2149 static int is_systemd_timer_available(void)
2150 {
2151 const char *cmd = "systemctl";
2152 int is_available;
2153
2154 if (get_schedule_cmd(&cmd, &is_available))
2155 return is_available;
2156
2157 return real_is_systemd_timer_available();
2158 }
2159
2160 static char *xdg_config_home_systemd(const char *filename)
2161 {
2162 return xdg_config_home_for("systemd/user", filename);
2163 }
2164
2165 static int systemd_timer_enable_unit(int enable,
2166 enum schedule_priority schedule)
2167 {
2168 const char *cmd = "systemctl";
2169 struct child_process child = CHILD_PROCESS_INIT;
2170 const char *frequency = get_frequency(schedule);
2171
2172 /*
2173 * Disabling the systemd unit while it is already disabled makes
2174 * systemctl print an error.
2175 * Let's ignore it since it means we already are in the expected state:
2176 * the unit is disabled.
2177 *
2178 * On the other hand, enabling a systemd unit which is already enabled
2179 * produces no error.
2180 */
2181 if (!enable)
2182 child.no_stderr = 1;
2183
2184 get_schedule_cmd(&cmd, NULL);
2185 strvec_split(&child.args, cmd);
2186 strvec_pushl(&child.args, "--user", enable ? "enable" : "disable",
2187 "--now", NULL);
2188 strvec_pushf(&child.args, "git-maintenance@%s.timer", frequency);
2189
2190 if (start_command(&child))
2191 return error(_("failed to start systemctl"));
2192 if (finish_command(&child))
2193 /*
2194 * Disabling an already disabled systemd unit makes
2195 * systemctl fail.
2196 * Let's ignore this failure.
2197 *
2198 * Enabling an enabled systemd unit doesn't fail.
2199 */
2200 if (enable)
2201 return error(_("failed to run systemctl"));
2202 return 0;
2203 }
2204
2205 static int systemd_timer_delete_unit_templates(void)
2206 {
2207 int ret = 0;
2208 char *filename = xdg_config_home_systemd("git-maintenance@.timer");
2209 if (unlink(filename) && !is_missing_file_error(errno))
2210 ret = error_errno(_("failed to delete '%s'"), filename);
2211 FREE_AND_NULL(filename);
2212
2213 filename = xdg_config_home_systemd("git-maintenance@.service");
2214 if (unlink(filename) && !is_missing_file_error(errno))
2215 ret = error_errno(_("failed to delete '%s'"), filename);
2216
2217 free(filename);
2218 return ret;
2219 }
2220
2221 static int systemd_timer_delete_units(void)
2222 {
2223 return systemd_timer_enable_unit(0, SCHEDULE_HOURLY) ||
2224 systemd_timer_enable_unit(0, SCHEDULE_DAILY) ||
2225 systemd_timer_enable_unit(0, SCHEDULE_WEEKLY) ||
2226 systemd_timer_delete_unit_templates();
2227 }
2228
2229 static int systemd_timer_write_unit_templates(const char *exec_path)
2230 {
2231 char *filename;
2232 FILE *file;
2233 const char *unit;
2234
2235 filename = xdg_config_home_systemd("git-maintenance@.timer");
2236 if (safe_create_leading_directories(filename)) {
2237 error(_("failed to create directories for '%s'"), filename);
2238 goto error;
2239 }
2240 file = fopen_or_warn(filename, "w");
2241 if (file == NULL)
2242 goto error;
2243
2244 unit = "# This file was created and is maintained by Git.\n"
2245 "# Any edits made in this file might be replaced in the future\n"
2246 "# by a Git command.\n"
2247 "\n"
2248 "[Unit]\n"
2249 "Description=Optimize Git repositories data\n"
2250 "\n"
2251 "[Timer]\n"
2252 "OnCalendar=%i\n"
2253 "Persistent=true\n"
2254 "\n"
2255 "[Install]\n"
2256 "WantedBy=timers.target\n";
2257 if (fputs(unit, file) == EOF) {
2258 error(_("failed to write to '%s'"), filename);
2259 fclose(file);
2260 goto error;
2261 }
2262 if (fclose(file) == EOF) {
2263 error_errno(_("failed to flush '%s'"), filename);
2264 goto error;
2265 }
2266 free(filename);
2267
2268 filename = xdg_config_home_systemd("git-maintenance@.service");
2269 file = fopen_or_warn(filename, "w");
2270 if (file == NULL)
2271 goto error;
2272
2273 unit = "# This file was created and is maintained by Git.\n"
2274 "# Any edits made in this file might be replaced in the future\n"
2275 "# by a Git command.\n"
2276 "\n"
2277 "[Unit]\n"
2278 "Description=Optimize Git repositories data\n"
2279 "\n"
2280 "[Service]\n"
2281 "Type=oneshot\n"
2282 "ExecStart=\"%s/git\" --exec-path=\"%s\" for-each-repo --config=maintenance.repo maintenance run --schedule=%%i\n"
2283 "LockPersonality=yes\n"
2284 "MemoryDenyWriteExecute=yes\n"
2285 "NoNewPrivileges=yes\n"
2286 "RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6\n"
2287 "RestrictNamespaces=yes\n"
2288 "RestrictRealtime=yes\n"
2289 "RestrictSUIDSGID=yes\n"
2290 "SystemCallArchitectures=native\n"
2291 "SystemCallFilter=@system-service\n";
2292 if (fprintf(file, unit, exec_path, exec_path) < 0) {
2293 error(_("failed to write to '%s'"), filename);
2294 fclose(file);
2295 goto error;
2296 }
2297 if (fclose(file) == EOF) {
2298 error_errno(_("failed to flush '%s'"), filename);
2299 goto error;
2300 }
2301 free(filename);
2302 return 0;
2303
2304 error:
2305 free(filename);
2306 systemd_timer_delete_unit_templates();
2307 return -1;
2308 }
2309
2310 static int systemd_timer_setup_units(void)
2311 {
2312 const char *exec_path = git_exec_path();
2313
2314 int ret = systemd_timer_write_unit_templates(exec_path) ||
2315 systemd_timer_enable_unit(1, SCHEDULE_HOURLY) ||
2316 systemd_timer_enable_unit(1, SCHEDULE_DAILY) ||
2317 systemd_timer_enable_unit(1, SCHEDULE_WEEKLY);
2318 if (ret)
2319 systemd_timer_delete_units();
2320 return ret;
2321 }
2322
2323 static int systemd_timer_update_schedule(int run_maintenance, int fd)
2324 {
2325 if (run_maintenance)
2326 return systemd_timer_setup_units();
2327 else
2328 return systemd_timer_delete_units();
2329 }
2330
2331 enum scheduler {
2332 SCHEDULER_INVALID = -1,
2333 SCHEDULER_AUTO,
2334 SCHEDULER_CRON,
2335 SCHEDULER_SYSTEMD,
2336 SCHEDULER_LAUNCHCTL,
2337 SCHEDULER_SCHTASKS,
2338 };
2339
2340 static const struct {
2341 const char *name;
2342 int (*is_available)(void);
2343 int (*update_schedule)(int run_maintenance, int fd);
2344 } scheduler_fn[] = {
2345 [SCHEDULER_CRON] = {
2346 .name = "crontab",
2347 .is_available = is_crontab_available,
2348 .update_schedule = crontab_update_schedule,
2349 },
2350 [SCHEDULER_SYSTEMD] = {
2351 .name = "systemctl",
2352 .is_available = is_systemd_timer_available,
2353 .update_schedule = systemd_timer_update_schedule,
2354 },
2355 [SCHEDULER_LAUNCHCTL] = {
2356 .name = "launchctl",
2357 .is_available = is_launchctl_available,
2358 .update_schedule = launchctl_update_schedule,
2359 },
2360 [SCHEDULER_SCHTASKS] = {
2361 .name = "schtasks",
2362 .is_available = is_schtasks_available,
2363 .update_schedule = schtasks_update_schedule,
2364 },
2365 };
2366
2367 static enum scheduler parse_scheduler(const char *value)
2368 {
2369 if (!value)
2370 return SCHEDULER_INVALID;
2371 else if (!strcasecmp(value, "auto"))
2372 return SCHEDULER_AUTO;
2373 else if (!strcasecmp(value, "cron") || !strcasecmp(value, "crontab"))
2374 return SCHEDULER_CRON;
2375 else if (!strcasecmp(value, "systemd") ||
2376 !strcasecmp(value, "systemd-timer"))
2377 return SCHEDULER_SYSTEMD;
2378 else if (!strcasecmp(value, "launchctl"))
2379 return SCHEDULER_LAUNCHCTL;
2380 else if (!strcasecmp(value, "schtasks"))
2381 return SCHEDULER_SCHTASKS;
2382 else
2383 return SCHEDULER_INVALID;
2384 }
2385
2386 static int maintenance_opt_scheduler(const struct option *opt, const char *arg,
2387 int unset)
2388 {
2389 enum scheduler *scheduler = opt->value;
2390
2391 BUG_ON_OPT_NEG(unset);
2392
2393 *scheduler = parse_scheduler(arg);
2394 if (*scheduler == SCHEDULER_INVALID)
2395 return error(_("unrecognized --scheduler argument '%s'"), arg);
2396 return 0;
2397 }
2398
2399 struct maintenance_start_opts {
2400 enum scheduler scheduler;
2401 };
2402
2403 static enum scheduler resolve_scheduler(enum scheduler scheduler)
2404 {
2405 if (scheduler != SCHEDULER_AUTO)
2406 return scheduler;
2407
2408 #if defined(__APPLE__)
2409 return SCHEDULER_LAUNCHCTL;
2410
2411 #elif defined(GIT_WINDOWS_NATIVE)
2412 return SCHEDULER_SCHTASKS;
2413
2414 #elif defined(__linux__)
2415 if (is_systemd_timer_available())
2416 return SCHEDULER_SYSTEMD;
2417 else if (is_crontab_available())
2418 return SCHEDULER_CRON;
2419 else
2420 die(_("neither systemd timers nor crontab are available"));
2421
2422 #else
2423 return SCHEDULER_CRON;
2424 #endif
2425 }
2426
2427 static void validate_scheduler(enum scheduler scheduler)
2428 {
2429 if (scheduler == SCHEDULER_INVALID)
2430 BUG("invalid scheduler");
2431 if (scheduler == SCHEDULER_AUTO)
2432 BUG("resolve_scheduler should have been called before");
2433
2434 if (!scheduler_fn[scheduler].is_available())
2435 die(_("%s scheduler is not available"),
2436 scheduler_fn[scheduler].name);
2437 }
2438
2439 static int update_background_schedule(const struct maintenance_start_opts *opts,
2440 int enable)
2441 {
2442 unsigned int i;
2443 int result = 0;
2444 struct lock_file lk;
2445 char *lock_path = xstrfmt("%s/schedule", the_repository->objects->odb->path);
2446
2447 if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) {
2448 free(lock_path);
2449 return error(_("another process is scheduling background maintenance"));
2450 }
2451
2452 for (i = 1; i < ARRAY_SIZE(scheduler_fn); i++) {
2453 if (enable && opts->scheduler == i)
2454 continue;
2455 if (!scheduler_fn[i].is_available())
2456 continue;
2457 scheduler_fn[i].update_schedule(0, get_lock_file_fd(&lk));
2458 }
2459
2460 if (enable)
2461 result = scheduler_fn[opts->scheduler].update_schedule(
2462 1, get_lock_file_fd(&lk));
2463
2464 rollback_lock_file(&lk);
2465
2466 free(lock_path);
2467 return result;
2468 }
2469
2470 static const char *const builtin_maintenance_start_usage[] = {
2471 N_("git maintenance start [--scheduler=<scheduler>]"),
2472 NULL
2473 };
2474
2475 static int maintenance_start(int argc, const char **argv, const char *prefix)
2476 {
2477 struct maintenance_start_opts opts = { 0 };
2478 struct option options[] = {
2479 OPT_CALLBACK_F(
2480 0, "scheduler", &opts.scheduler, N_("scheduler"),
2481 N_("scheduler to trigger git maintenance run"),
2482 PARSE_OPT_NONEG, maintenance_opt_scheduler),
2483 OPT_END()
2484 };
2485
2486 argc = parse_options(argc, argv, prefix, options,
2487 builtin_maintenance_start_usage, 0);
2488 if (argc)
2489 usage_with_options(builtin_maintenance_start_usage, options);
2490
2491 opts.scheduler = resolve_scheduler(opts.scheduler);
2492 validate_scheduler(opts.scheduler);
2493
2494 if (maintenance_register())
2495 warning(_("failed to add repo to global config"));
2496 return update_background_schedule(&opts, 1);
2497 }
2498
2499 static int maintenance_stop(void)
2500 {
2501 return update_background_schedule(NULL, 0);
2502 }
2503
2504 static const char builtin_maintenance_usage[] = N_("git maintenance <subcommand> [<options>]");
2505
2506 int cmd_maintenance(int argc, const char **argv, const char *prefix)
2507 {
2508 if (argc < 2 ||
2509 (argc == 2 && !strcmp(argv[1], "-h")))
2510 usage(builtin_maintenance_usage);
2511
2512 if (!strcmp(argv[1], "run"))
2513 return maintenance_run(argc - 1, argv + 1, prefix);
2514 if (!strcmp(argv[1], "start"))
2515 return maintenance_start(argc - 1, argv + 1, prefix);
2516 if (!strcmp(argv[1], "stop"))
2517 return maintenance_stop();
2518 if (!strcmp(argv[1], "register"))
2519 return maintenance_register();
2520 if (!strcmp(argv[1], "unregister"))
2521 return maintenance_unregister();
2522
2523 die(_("invalid subcommand: %s"), argv[1]);
2524 }
git for Debian