diff options
Diffstat (limited to 'builtin/gc.c')
| -rw-r--r-- | builtin/gc.c | 2793 |
1 files changed, 2793 insertions, 0 deletions
diff --git a/builtin/gc.c b/builtin/gc.c new file mode 100644 index 0000000..7c11d5e --- /dev/null +++ b/builtin/gc.c @@ -0,0 +1,2793 @@ +/* + * git gc builtin command + * + * Cleanup unreachable files and optimize the repository. + * + * Copyright (c) 2007 James Bowes + * + * Based on git-gc.sh, which is + * + * Copyright (c) 2006 Shawn O. Pearce + */ + +#include "builtin.h" +#include "abspath.h" +#include "date.h" +#include "environment.h" +#include "hex.h" +#include "repository.h" +#include "config.h" +#include "tempfile.h" +#include "lockfile.h" +#include "parse-options.h" +#include "run-command.h" +#include "sigchain.h" +#include "strvec.h" +#include "commit.h" +#include "commit-graph.h" +#include "packfile.h" +#include "object-file.h" +#include "object-store-ll.h" +#include "pack.h" +#include "pack-objects.h" +#include "path.h" +#include "blob.h" +#include "tree.h" +#include "promisor-remote.h" +#include "refs.h" +#include "remote.h" +#include "exec-cmd.h" +#include "gettext.h" +#include "hook.h" +#include "setup.h" +#include "trace2.h" + +#define FAILED_RUN "failed to run %s" + +static const char * const builtin_gc_usage[] = { + N_("git gc [<options>]"), + NULL +}; + +static int pack_refs = 1; +static int prune_reflogs = 1; +static int cruft_packs = 1; +static unsigned long max_cruft_size; +static int aggressive_depth = 50; +static int aggressive_window = 250; +static int gc_auto_threshold = 6700; +static int gc_auto_pack_limit = 50; +static int detach_auto = 1; +static timestamp_t gc_log_expire_time; +static const char *gc_log_expire = "1.day.ago"; +static const char *prune_expire = "2.weeks.ago"; +static const char *prune_worktrees_expire = "3.months.ago"; +static char *repack_filter; +static char *repack_filter_to; +static unsigned long big_pack_threshold; +static unsigned long max_delta_cache_size = DEFAULT_DELTA_CACHE_SIZE; + +static struct strvec reflog = STRVEC_INIT; +static struct strvec repack = STRVEC_INIT; +static struct strvec prune = STRVEC_INIT; +static struct strvec prune_worktrees = STRVEC_INIT; +static struct strvec rerere = STRVEC_INIT; + +static struct tempfile *pidfile; +static struct lock_file log_lock; + +static struct string_list pack_garbage = STRING_LIST_INIT_DUP; + +static void clean_pack_garbage(void) +{ + int i; + for (i = 0; i < pack_garbage.nr; i++) + unlink_or_warn(pack_garbage.items[i].string); + string_list_clear(&pack_garbage, 0); +} + +static void report_pack_garbage(unsigned seen_bits, const char *path) +{ + if (seen_bits == PACKDIR_FILE_IDX) + string_list_append(&pack_garbage, path); +} + +static void process_log_file(void) +{ + struct stat st; + if (fstat(get_lock_file_fd(&log_lock), &st)) { + /* + * Perhaps there was an i/o error or another + * unlikely situation. Try to make a note of + * this in gc.log along with any existing + * messages. + */ + int saved_errno = errno; + fprintf(stderr, _("Failed to fstat %s: %s"), + get_lock_file_path(&log_lock), + strerror(saved_errno)); + fflush(stderr); + commit_lock_file(&log_lock); + errno = saved_errno; + } else if (st.st_size) { + /* There was some error recorded in the lock file */ + commit_lock_file(&log_lock); + } else { + /* No error, clean up any old gc.log */ + unlink(git_path("gc.log")); + rollback_lock_file(&log_lock); + } +} + +static void process_log_file_at_exit(void) +{ + fflush(stderr); + process_log_file(); +} + +static void process_log_file_on_signal(int signo) +{ + process_log_file(); + sigchain_pop(signo); + raise(signo); +} + +static int gc_config_is_timestamp_never(const char *var) +{ + const char *value; + timestamp_t expire; + + if (!git_config_get_value(var, &value) && value) { + if (parse_expiry_date(value, &expire)) + die(_("failed to parse '%s' value '%s'"), var, value); + return expire == 0; + } + return 0; +} + +static void gc_config(void) +{ + const char *value; + + if (!git_config_get_value("gc.packrefs", &value)) { + if (value && !strcmp(value, "notbare")) + pack_refs = -1; + else + pack_refs = git_config_bool("gc.packrefs", value); + } + + if (gc_config_is_timestamp_never("gc.reflogexpire") && + gc_config_is_timestamp_never("gc.reflogexpireunreachable")) + prune_reflogs = 0; + + git_config_get_int("gc.aggressivewindow", &aggressive_window); + git_config_get_int("gc.aggressivedepth", &aggressive_depth); + git_config_get_int("gc.auto", &gc_auto_threshold); + git_config_get_int("gc.autopacklimit", &gc_auto_pack_limit); + git_config_get_bool("gc.autodetach", &detach_auto); + git_config_get_bool("gc.cruftpacks", &cruft_packs); + git_config_get_ulong("gc.maxcruftsize", &max_cruft_size); + git_config_get_expiry("gc.pruneexpire", &prune_expire); + git_config_get_expiry("gc.worktreepruneexpire", &prune_worktrees_expire); + git_config_get_expiry("gc.logexpiry", &gc_log_expire); + + git_config_get_ulong("gc.bigpackthreshold", &big_pack_threshold); + git_config_get_ulong("pack.deltacachesize", &max_delta_cache_size); + + git_config_get_string("gc.repackfilter", &repack_filter); + git_config_get_string("gc.repackfilterto", &repack_filter_to); + + git_config(git_default_config, NULL); +} + +struct maintenance_run_opts; +static int maintenance_task_pack_refs(MAYBE_UNUSED struct maintenance_run_opts *opts) +{ + struct child_process cmd = CHILD_PROCESS_INIT; + + cmd.git_cmd = 1; + strvec_pushl(&cmd.args, "pack-refs", "--all", "--prune", NULL); + return run_command(&cmd); +} + +static int too_many_loose_objects(void) +{ + /* + * Quickly check if a "gc" is needed, by estimating how + * many loose objects there are. Because SHA-1 is evenly + * distributed, we can check only one and get a reasonable + * estimate. + */ + DIR *dir; + struct dirent *ent; + int auto_threshold; + int num_loose = 0; + int needed = 0; + const unsigned hexsz_loose = the_hash_algo->hexsz - 2; + + dir = opendir(git_path("objects/17")); + if (!dir) + return 0; + + auto_threshold = DIV_ROUND_UP(gc_auto_threshold, 256); + while ((ent = readdir(dir)) != NULL) { + if (strspn(ent->d_name, "0123456789abcdef") != hexsz_loose || + ent->d_name[hexsz_loose] != '\0') + continue; + if (++num_loose > auto_threshold) { + needed = 1; + break; + } + } + closedir(dir); + return needed; +} + +static struct packed_git *find_base_packs(struct string_list *packs, + unsigned long limit) +{ + struct packed_git *p, *base = NULL; + + for (p = get_all_packs(the_repository); p; p = p->next) { + if (!p->pack_local || p->is_cruft) + continue; + if (limit) { + if (p->pack_size >= limit) + string_list_append(packs, p->pack_name); + } else if (!base || base->pack_size < p->pack_size) { + base = p; + } + } + + if (base) + string_list_append(packs, base->pack_name); + + return base; +} + +static int too_many_packs(void) +{ + struct packed_git *p; + int cnt; + + if (gc_auto_pack_limit <= 0) + return 0; + + for (cnt = 0, p = get_all_packs(the_repository); p; p = p->next) { + if (!p->pack_local) + continue; + if (p->pack_keep) + continue; + /* + * Perhaps check the size of the pack and count only + * very small ones here? + */ + cnt++; + } + return gc_auto_pack_limit < cnt; +} + +static uint64_t total_ram(void) +{ +#if defined(HAVE_SYSINFO) + struct sysinfo si; + + if (!sysinfo(&si)) + return si.totalram; +#elif defined(HAVE_BSD_SYSCTL) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM)) + int64_t physical_memory; + int mib[2]; + size_t length; + + mib[0] = CTL_HW; +# if defined(HW_MEMSIZE) + mib[1] = HW_MEMSIZE; +# else + mib[1] = HW_PHYSMEM; +# endif + length = sizeof(int64_t); + if (!sysctl(mib, 2, &physical_memory, &length, NULL, 0)) + return physical_memory; +#elif defined(GIT_WINDOWS_NATIVE) + MEMORYSTATUSEX memInfo; + + memInfo.dwLength = sizeof(MEMORYSTATUSEX); + if (GlobalMemoryStatusEx(&memInfo)) + return memInfo.ullTotalPhys; +#endif + return 0; +} + +static uint64_t estimate_repack_memory(struct packed_git *pack) +{ + unsigned long nr_objects = repo_approximate_object_count(the_repository); + size_t os_cache, heap; + + if (!pack || !nr_objects) + return 0; + + /* + * First we have to scan through at least one pack. + * Assume enough room in OS file cache to keep the entire pack + * or we may accidentally evict data of other processes from + * the cache. + */ + os_cache = pack->pack_size + pack->index_size; + /* then pack-objects needs lots more for book keeping */ + heap = sizeof(struct object_entry) * nr_objects; + /* + * internal rev-list --all --objects takes up some memory too, + * let's say half of it is for blobs + */ + heap += sizeof(struct blob) * nr_objects / 2; + /* + * and the other half is for trees (commits and tags are + * usually insignificant) + */ + heap += sizeof(struct tree) * nr_objects / 2; + /* and then obj_hash[], underestimated in fact */ + heap += sizeof(struct object *) * nr_objects; + /* revindex is used also */ + heap += (sizeof(off_t) + sizeof(uint32_t)) * nr_objects; + /* + * read_sha1_file() (either at delta calculation phase, or + * writing phase) also fills up the delta base cache + */ + heap += delta_base_cache_limit; + /* and of course pack-objects has its own delta cache */ + heap += max_delta_cache_size; + + return os_cache + heap; +} + +static int keep_one_pack(struct string_list_item *item, void *data UNUSED) +{ + strvec_pushf(&repack, "--keep-pack=%s", basename(item->string)); + return 0; +} + +static void add_repack_all_option(struct string_list *keep_pack) +{ + if (prune_expire && !strcmp(prune_expire, "now")) + strvec_push(&repack, "-a"); + else if (cruft_packs) { + strvec_push(&repack, "--cruft"); + if (prune_expire) + strvec_pushf(&repack, "--cruft-expiration=%s", prune_expire); + if (max_cruft_size) + strvec_pushf(&repack, "--max-cruft-size=%lu", + max_cruft_size); + } else { + strvec_push(&repack, "-A"); + if (prune_expire) + strvec_pushf(&repack, "--unpack-unreachable=%s", prune_expire); + } + + if (keep_pack) + for_each_string_list(keep_pack, keep_one_pack, NULL); + + if (repack_filter && *repack_filter) + strvec_pushf(&repack, "--filter=%s", repack_filter); + if (repack_filter_to && *repack_filter_to) + strvec_pushf(&repack, "--filter-to=%s", repack_filter_to); +} + +static void add_repack_incremental_option(void) +{ + strvec_push(&repack, "--no-write-bitmap-index"); +} + +static int need_to_gc(void) +{ + /* + * Setting gc.auto to 0 or negative can disable the + * automatic gc. + */ + if (gc_auto_threshold <= 0) + return 0; + + /* + * If there are too many loose objects, but not too many + * packs, we run "repack -d -l". If there are too many packs, + * we run "repack -A -d -l". Otherwise we tell the caller + * there is no need. + */ + if (too_many_packs()) { + struct string_list keep_pack = STRING_LIST_INIT_NODUP; + + if (big_pack_threshold) { + find_base_packs(&keep_pack, big_pack_threshold); + if (keep_pack.nr >= gc_auto_pack_limit) { + big_pack_threshold = 0; + string_list_clear(&keep_pack, 0); + find_base_packs(&keep_pack, 0); + } + } else { + struct packed_git *p = find_base_packs(&keep_pack, 0); + uint64_t mem_have, mem_want; + + mem_have = total_ram(); + mem_want = estimate_repack_memory(p); + + /* + * Only allow 1/2 of memory for pack-objects, leave + * the rest for the OS and other processes in the + * system. + */ + if (!mem_have || mem_want < mem_have / 2) + string_list_clear(&keep_pack, 0); + } + + add_repack_all_option(&keep_pack); + string_list_clear(&keep_pack, 0); + } else if (too_many_loose_objects()) + add_repack_incremental_option(); + else + return 0; + + if (run_hooks("pre-auto-gc")) + return 0; + return 1; +} + +/* return NULL on success, else hostname running the gc */ +static const char *lock_repo_for_gc(int force, pid_t* ret_pid) +{ + struct lock_file lock = LOCK_INIT; + char my_host[HOST_NAME_MAX + 1]; + struct strbuf sb = STRBUF_INIT; + struct stat st; + uintmax_t pid; + FILE *fp; + int fd; + char *pidfile_path; + + if (is_tempfile_active(pidfile)) + /* already locked */ + return NULL; + + if (xgethostname(my_host, sizeof(my_host))) + xsnprintf(my_host, sizeof(my_host), "unknown"); + + pidfile_path = git_pathdup("gc.pid"); + fd = hold_lock_file_for_update(&lock, pidfile_path, + LOCK_DIE_ON_ERROR); + if (!force) { + static char locking_host[HOST_NAME_MAX + 1]; + static char *scan_fmt; + int should_exit; + + if (!scan_fmt) + scan_fmt = xstrfmt("%s %%%ds", "%"SCNuMAX, HOST_NAME_MAX); + fp = fopen(pidfile_path, "r"); + memset(locking_host, 0, sizeof(locking_host)); + should_exit = + fp != NULL && + !fstat(fileno(fp), &st) && + /* + * 12 hour limit is very generous as gc should + * never take that long. On the other hand we + * don't really need a strict limit here, + * running gc --auto one day late is not a big + * problem. --force can be used in manual gc + * after the user verifies that no gc is + * running. + */ + time(NULL) - st.st_mtime <= 12 * 3600 && + fscanf(fp, scan_fmt, &pid, locking_host) == 2 && + /* be gentle to concurrent "gc" on remote hosts */ + (strcmp(locking_host, my_host) || !kill(pid, 0) || errno == EPERM); + if (fp) + fclose(fp); + if (should_exit) { + if (fd >= 0) + rollback_lock_file(&lock); + *ret_pid = pid; + free(pidfile_path); + return locking_host; + } + } + + strbuf_addf(&sb, "%"PRIuMAX" %s", + (uintmax_t) getpid(), my_host); + write_in_full(fd, sb.buf, sb.len); + strbuf_release(&sb); + commit_lock_file(&lock); + pidfile = register_tempfile(pidfile_path); + free(pidfile_path); + return NULL; +} + +/* + * Returns 0 if there was no previous error and gc can proceed, 1 if + * gc should not proceed due to an error in the last run. Prints a + * message and returns with a non-[01] status code if an error occurred + * while reading gc.log + */ +static int report_last_gc_error(void) +{ + struct strbuf sb = STRBUF_INIT; + int ret = 0; + ssize_t len; + struct stat st; + char *gc_log_path = git_pathdup("gc.log"); + + if (stat(gc_log_path, &st)) { + if (errno == ENOENT) + goto done; + + ret = die_message_errno(_("cannot stat '%s'"), gc_log_path); + goto done; + } + + if (st.st_mtime < gc_log_expire_time) + goto done; + + len = strbuf_read_file(&sb, gc_log_path, 0); + if (len < 0) + ret = die_message_errno(_("cannot read '%s'"), gc_log_path); + else if (len > 0) { + /* + * A previous gc failed. Report the error, and don't + * bother with an automatic gc run since it is likely + * to fail in the same way. + */ + warning(_("The last gc run reported the following. " + "Please correct the root cause\n" + "and remove %s\n" + "Automatic cleanup will not be performed " + "until the file is removed.\n\n" + "%s"), + gc_log_path, sb.buf); + ret = 1; + } + strbuf_release(&sb); +done: + free(gc_log_path); + return ret; +} + +static void gc_before_repack(void) +{ + /* + * We may be called twice, as both the pre- and + * post-daemonized phases will call us, but running these + * commands more than once is pointless and wasteful. + */ + static int done = 0; + if (done++) + return; + + if (pack_refs && maintenance_task_pack_refs(NULL)) + die(FAILED_RUN, "pack-refs"); + + if (prune_reflogs) { + struct child_process cmd = CHILD_PROCESS_INIT; + + cmd.git_cmd = 1; + strvec_pushv(&cmd.args, reflog.v); + if (run_command(&cmd)) + die(FAILED_RUN, reflog.v[0]); + } +} + +int cmd_gc(int argc, const char **argv, const char *prefix) +{ + int aggressive = 0; + int auto_gc = 0; + int quiet = 0; + int force = 0; + const char *name; + pid_t pid; + int daemonized = 0; + int keep_largest_pack = -1; + timestamp_t dummy; + struct child_process rerere_cmd = CHILD_PROCESS_INIT; + + struct option builtin_gc_options[] = { + OPT__QUIET(&quiet, N_("suppress progress reporting")), + { OPTION_STRING, 0, "prune", &prune_expire, N_("date"), + N_("prune unreferenced objects"), + PARSE_OPT_OPTARG, NULL, (intptr_t)prune_expire }, + OPT_BOOL(0, "cruft", &cruft_packs, N_("pack unreferenced objects separately")), + OPT_MAGNITUDE(0, "max-cruft-size", &max_cruft_size, + N_("with --cruft, limit the size of new cruft packs")), + OPT_BOOL(0, "aggressive", &aggressive, N_("be more thorough (increased runtime)")), + OPT_BOOL_F(0, "auto", &auto_gc, N_("enable auto-gc mode"), + PARSE_OPT_NOCOMPLETE), + OPT_BOOL_F(0, "force", &force, + N_("force running gc even if there may be another gc running"), + PARSE_OPT_NOCOMPLETE), + OPT_BOOL(0, "keep-largest-pack", &keep_largest_pack, + N_("repack all other packs except the largest pack")), + OPT_END() + }; + + if (argc == 2 && !strcmp(argv[1], "-h")) + usage_with_options(builtin_gc_usage, builtin_gc_options); + + strvec_pushl(&reflog, "reflog", "expire", "--all", NULL); + strvec_pushl(&repack, "repack", "-d", "-l", NULL); + strvec_pushl(&prune, "prune", "--expire", NULL); + strvec_pushl(&prune_worktrees, "worktree", "prune", "--expire", NULL); + strvec_pushl(&rerere, "rerere", "gc", NULL); + + /* default expiry time, overwritten in gc_config */ + gc_config(); + if (parse_expiry_date(gc_log_expire, &gc_log_expire_time)) + die(_("failed to parse gc.logExpiry value %s"), gc_log_expire); + + if (pack_refs < 0) + pack_refs = !is_bare_repository(); + + argc = parse_options(argc, argv, prefix, builtin_gc_options, + builtin_gc_usage, 0); + if (argc > 0) + usage_with_options(builtin_gc_usage, builtin_gc_options); + + if (prune_expire && parse_expiry_date(prune_expire, &dummy)) + die(_("failed to parse prune expiry value %s"), prune_expire); + + if (aggressive) { + strvec_push(&repack, "-f"); + if (aggressive_depth > 0) + strvec_pushf(&repack, "--depth=%d", aggressive_depth); + if (aggressive_window > 0) + strvec_pushf(&repack, "--window=%d", aggressive_window); + } + if (quiet) + strvec_push(&repack, "-q"); + + if (auto_gc) { + /* + * Auto-gc should be least intrusive as possible. + */ + if (!need_to_gc()) + return 0; + if (!quiet) { + if (detach_auto) + fprintf(stderr, _("Auto packing the repository in background for optimum performance.\n")); + else + fprintf(stderr, _("Auto packing the repository for optimum performance.\n")); + fprintf(stderr, _("See \"git help gc\" for manual housekeeping.\n")); + } + if (detach_auto) { + int ret = report_last_gc_error(); + + if (ret == 1) + /* Last gc --auto failed. Skip this one. */ + return 0; + else if (ret) + /* an I/O error occurred, already reported */ + return ret; + + if (lock_repo_for_gc(force, &pid)) + return 0; + gc_before_repack(); /* dies on failure */ + delete_tempfile(&pidfile); + + /* + * failure to daemonize is ok, we'll continue + * in foreground + */ + daemonized = !daemonize(); + } + } else { + struct string_list keep_pack = STRING_LIST_INIT_NODUP; + + if (keep_largest_pack != -1) { + if (keep_largest_pack) + find_base_packs(&keep_pack, 0); + } else if (big_pack_threshold) { + find_base_packs(&keep_pack, big_pack_threshold); + } + + add_repack_all_option(&keep_pack); + string_list_clear(&keep_pack, 0); + } + + name = lock_repo_for_gc(force, &pid); + if (name) { + if (auto_gc) + return 0; /* be quiet on --auto */ + die(_("gc is already running on machine '%s' pid %"PRIuMAX" (use --force if not)"), + name, (uintmax_t)pid); + } + + if (daemonized) { + hold_lock_file_for_update(&log_lock, + git_path("gc.log"), + LOCK_DIE_ON_ERROR); + dup2(get_lock_file_fd(&log_lock), 2); + sigchain_push_common(process_log_file_on_signal); + atexit(process_log_file_at_exit); + } + + gc_before_repack(); + + if (!repository_format_precious_objects) { + struct child_process repack_cmd = CHILD_PROCESS_INIT; + + repack_cmd.git_cmd = 1; + repack_cmd.close_object_store = 1; + strvec_pushv(&repack_cmd.args, repack.v); + if (run_command(&repack_cmd)) + die(FAILED_RUN, repack.v[0]); + + if (prune_expire) { + struct child_process prune_cmd = CHILD_PROCESS_INIT; + + /* run `git prune` even if using cruft packs */ + strvec_push(&prune, prune_expire); + if (quiet) + strvec_push(&prune, "--no-progress"); + if (repo_has_promisor_remote(the_repository)) + strvec_push(&prune, + "--exclude-promisor-objects"); + prune_cmd.git_cmd = 1; + strvec_pushv(&prune_cmd.args, prune.v); + if (run_command(&prune_cmd)) + die(FAILED_RUN, prune.v[0]); + } + } + + if (prune_worktrees_expire) { + struct child_process prune_worktrees_cmd = CHILD_PROCESS_INIT; + + strvec_push(&prune_worktrees, prune_worktrees_expire); + prune_worktrees_cmd.git_cmd = 1; + strvec_pushv(&prune_worktrees_cmd.args, prune_worktrees.v); + if (run_command(&prune_worktrees_cmd)) + die(FAILED_RUN, prune_worktrees.v[0]); + } + + rerere_cmd.git_cmd = 1; + strvec_pushv(&rerere_cmd.args, rerere.v); + if (run_command(&rerere_cmd)) + die(FAILED_RUN, rerere.v[0]); + + report_garbage = report_pack_garbage; + reprepare_packed_git(the_repository); + if (pack_garbage.nr > 0) { + close_object_store(the_repository->objects); + clean_pack_garbage(); + } + + if (the_repository->settings.gc_write_commit_graph == 1) + write_commit_graph_reachable(the_repository->objects->odb, + !quiet && !daemonized ? COMMIT_GRAPH_WRITE_PROGRESS : 0, + NULL); + + if (auto_gc && too_many_loose_objects()) + warning(_("There are too many unreachable loose objects; " + "run 'git prune' to remove them.")); + + if (!daemonized) + unlink(git_path("gc.log")); + + return 0; +} + +static const char *const builtin_maintenance_run_usage[] = { + N_("git maintenance run [--auto] [--[no-]quiet] [--task=<task>] [--schedule]"), + NULL +}; + +enum schedule_priority { + SCHEDULE_NONE = 0, + SCHEDULE_WEEKLY = 1, + SCHEDULE_DAILY = 2, + SCHEDULE_HOURLY = 3, +}; + +static enum schedule_priority parse_schedule(const char *value) +{ + if (!value) + return SCHEDULE_NONE; + if (!strcasecmp(value, "hourly")) + return SCHEDULE_HOURLY; + if (!strcasecmp(value, "daily")) + return SCHEDULE_DAILY; + if (!strcasecmp(value, "weekly")) + return SCHEDULE_WEEKLY; + return SCHEDULE_NONE; +} + +static int maintenance_opt_schedule(const struct option *opt, const char *arg, + int unset) +{ + enum schedule_priority *priority = opt->value; + + if (unset) + die(_("--no-schedule is not allowed")); + + *priority = parse_schedule(arg); + + if (!*priority) + die(_("unrecognized --schedule argument '%s'"), arg); + + return 0; +} + +struct maintenance_run_opts { + int auto_flag; + int quiet; + enum schedule_priority schedule; +}; + +/* Remember to update object flag allocation in object.h */ +#define SEEN (1u<<0) + +struct cg_auto_data { + int num_not_in_graph; + int limit; +}; + +static int dfs_on_ref(const char *refname UNUSED, + const struct object_id *oid, + int flags UNUSED, + void *cb_data) +{ + struct cg_auto_data *data = (struct cg_auto_data *)cb_data; + int result = 0; + struct object_id peeled; + struct commit_list *stack = NULL; + struct commit *commit; + + if (!peel_iterated_oid(oid, &peeled)) + oid = &peeled; + if (oid_object_info(the_repository, oid, NULL) != OBJ_COMMIT) + return 0; + + commit = lookup_commit(the_repository, oid); + if (!commit) + return 0; + if (repo_parse_commit(the_repository, commit) || + commit_graph_position(commit) != COMMIT_NOT_FROM_GRAPH) + return 0; + + data->num_not_in_graph++; + + if (data->num_not_in_graph >= data->limit) + return 1; + + commit_list_append(commit, &stack); + + while (!result && stack) { + struct commit_list *parent; + + commit = pop_commit(&stack); + + for (parent = commit->parents; parent; parent = parent->next) { + if (repo_parse_commit(the_repository, parent->item) || + commit_graph_position(parent->item) != COMMIT_NOT_FROM_GRAPH || + parent->item->object.flags & SEEN) + continue; + + parent->item->object.flags |= SEEN; + data->num_not_in_graph++; + + if (data->num_not_in_graph >= data->limit) { + result = 1; + break; + } + + commit_list_append(parent->item, &stack); + } + } + + free_commit_list(stack); + return result; +} + +static int should_write_commit_graph(void) +{ + int result; + struct cg_auto_data data; + + data.num_not_in_graph = 0; + data.limit = 100; + git_config_get_int("maintenance.commit-graph.auto", + &data.limit); + + if (!data.limit) + return 0; + if (data.limit < 0) + return 1; + + result = for_each_ref(dfs_on_ref, &data); + + repo_clear_commit_marks(the_repository, SEEN); + + return result; +} + +static int run_write_commit_graph(struct maintenance_run_opts *opts) +{ + struct child_process child = CHILD_PROCESS_INIT; + + child.git_cmd = child.close_object_store = 1; + strvec_pushl(&child.args, "commit-graph", "write", + "--split", "--reachable", NULL); + + if (opts->quiet) + strvec_push(&child.args, "--no-progress"); + + return !!run_command(&child); +} + +static int maintenance_task_commit_graph(struct maintenance_run_opts *opts) +{ + prepare_repo_settings(the_repository); + if (!the_repository->settings.core_commit_graph) + return 0; + + if (run_write_commit_graph(opts)) { + error(_("failed to write commit-graph")); + return 1; + } + + return 0; +} + +static int fetch_remote(struct remote *remote, void *cbdata) +{ + struct maintenance_run_opts *opts = cbdata; + struct child_process child = CHILD_PROCESS_INIT; + + if (remote->skip_default_update) + return 0; + + child.git_cmd = 1; + strvec_pushl(&child.args, "fetch", remote->name, + "--prefetch", "--prune", "--no-tags", + "--no-write-fetch-head", "--recurse-submodules=no", + NULL); + + if (opts->quiet) + strvec_push(&child.args, "--quiet"); + + return !!run_command(&child); +} + +static int maintenance_task_prefetch(struct maintenance_run_opts *opts) +{ + if (for_each_remote(fetch_remote, opts)) { + error(_("failed to prefetch remotes")); + return 1; + } + + return 0; +} + +static int maintenance_task_gc(struct maintenance_run_opts *opts) +{ + struct child_process child = CHILD_PROCESS_INIT; + + child.git_cmd = child.close_object_store = 1; + strvec_push(&child.args, "gc"); + + if (opts->auto_flag) + strvec_push(&child.args, "--auto"); + if (opts->quiet) + strvec_push(&child.args, "--quiet"); + else + strvec_push(&child.args, "--no-quiet"); + + return run_command(&child); +} + +static int prune_packed(struct maintenance_run_opts *opts) +{ + struct child_process child = CHILD_PROCESS_INIT; + + child.git_cmd = 1; + strvec_push(&child.args, "prune-packed"); + + if (opts->quiet) + strvec_push(&child.args, "--quiet"); + + return !!run_command(&child); +} + +struct write_loose_object_data { + FILE *in; + int count; + int batch_size; +}; + +static int loose_object_auto_limit = 100; + +static int loose_object_count(const struct object_id *oid UNUSED, + const char *path UNUSED, + void *data) +{ + int *count = (int*)data; + if (++(*count) >= loose_object_auto_limit) + return 1; + return 0; +} + +static int loose_object_auto_condition(void) +{ + int count = 0; + + git_config_get_int("maintenance.loose-objects.auto", + &loose_object_auto_limit); + + if (!loose_object_auto_limit) + return 0; + if (loose_object_auto_limit < 0) + return 1; + + return for_each_loose_file_in_objdir(the_repository->objects->odb->path, + loose_object_count, + NULL, NULL, &count); +} + +static int bail_on_loose(const struct object_id *oid UNUSED, + const char *path UNUSED, + void *data UNUSED) +{ + return 1; +} + +static int write_loose_object_to_stdin(const struct object_id *oid, + const char *path UNUSED, + void *data) +{ + struct write_loose_object_data *d = (struct write_loose_object_data *)data; + + fprintf(d->in, "%s\n", oid_to_hex(oid)); + + return ++(d->count) > d->batch_size; +} + +static int pack_loose(struct maintenance_run_opts *opts) +{ + struct repository *r = the_repository; + int result = 0; + struct write_loose_object_data data; + struct child_process pack_proc = CHILD_PROCESS_INIT; + + /* + * Do not start pack-objects process + * if there are no loose objects. + */ + if (!for_each_loose_file_in_objdir(r->objects->odb->path, + bail_on_loose, + NULL, NULL, NULL)) + return 0; + + pack_proc.git_cmd = 1; + + strvec_push(&pack_proc.args, "pack-objects"); + if (opts->quiet) + strvec_push(&pack_proc.args, "--quiet"); + strvec_pushf(&pack_proc.args, "%s/pack/loose", r->objects->odb->path); + + pack_proc.in = -1; + + if (start_command(&pack_proc)) { + error(_("failed to start 'git pack-objects' process")); + return 1; + } + + data.in = xfdopen(pack_proc.in, "w"); + data.count = 0; + data.batch_size = 50000; + + for_each_loose_file_in_objdir(r->objects->odb->path, + write_loose_object_to_stdin, + NULL, + NULL, + &data); + + fclose(data.in); + + if (finish_command(&pack_proc)) { + error(_("failed to finish 'git pack-objects' process")); + result = 1; + } + + return result; +} + +static int maintenance_task_loose_objects(struct maintenance_run_opts *opts) +{ + return prune_packed(opts) || pack_loose(opts); +} + +static int incremental_repack_auto_condition(void) +{ + struct packed_git *p; + int incremental_repack_auto_limit = 10; + int count = 0; + + prepare_repo_settings(the_repository); + if (!the_repository->settings.core_multi_pack_index) + return 0; + + git_config_get_int("maintenance.incremental-repack.auto", + &incremental_repack_auto_limit); + + if (!incremental_repack_auto_limit) + return 0; + if (incremental_repack_auto_limit < 0) + return 1; + + for (p = get_packed_git(the_repository); + count < incremental_repack_auto_limit && p; + p = p->next) { + if (!p->multi_pack_index) + count++; + } + + return count >= incremental_repack_auto_limit; +} + +static int multi_pack_index_write(struct maintenance_run_opts *opts) +{ + struct child_process child = CHILD_PROCESS_INIT; + + child.git_cmd = 1; + strvec_pushl(&child.args, "multi-pack-index", "write", NULL); + + if (opts->quiet) + strvec_push(&child.args, "--no-progress"); + + if (run_command(&child)) + return error(_("failed to write multi-pack-index")); + + return 0; +} + +static int multi_pack_index_expire(struct maintenance_run_opts *opts) +{ + struct child_process child = CHILD_PROCESS_INIT; + + child.git_cmd = child.close_object_store = 1; + strvec_pushl(&child.args, "multi-pack-index", "expire", NULL); + + if (opts->quiet) + strvec_push(&child.args, "--no-progress"); + + if (run_command(&child)) + return error(_("'git multi-pack-index expire' failed")); + + return 0; +} + +#define TWO_GIGABYTES (INT32_MAX) + +static off_t get_auto_pack_size(void) +{ + /* + * The "auto" value is special: we optimize for + * one large pack-file (i.e. from a clone) and + * expect the rest to be small and they can be + * repacked quickly. + * + * The strategy we select here is to select a + * size that is one more than the second largest + * pack-file. This ensures that we will repack + * at least two packs if there are three or more + * packs. + */ + off_t max_size = 0; + off_t second_largest_size = 0; + off_t result_size; + struct packed_git *p; + struct repository *r = the_repository; + + reprepare_packed_git(r); + for (p = get_all_packs(r); p; p = p->next) { + if (p->pack_size > max_size) { + second_largest_size = max_size; + max_size = p->pack_size; + } else if (p->pack_size > second_largest_size) + second_largest_size = p->pack_size; + } + + result_size = second_largest_size + 1; + + /* But limit ourselves to a batch size of 2g */ + if (result_size > TWO_GIGABYTES) + result_size = TWO_GIGABYTES; + + return result_size; +} + +static int multi_pack_index_repack(struct maintenance_run_opts *opts) +{ + struct child_process child = CHILD_PROCESS_INIT; + + child.git_cmd = child.close_object_store = 1; + strvec_pushl(&child.args, "multi-pack-index", "repack", NULL); + + if (opts->quiet) + strvec_push(&child.args, "--no-progress"); + + strvec_pushf(&child.args, "--batch-size=%"PRIuMAX, + (uintmax_t)get_auto_pack_size()); + + if (run_command(&child)) + return error(_("'git multi-pack-index repack' failed")); + + return 0; +} + +static int maintenance_task_incremental_repack(struct maintenance_run_opts *opts) +{ + prepare_repo_settings(the_repository); + if (!the_repository->settings.core_multi_pack_index) { + warning(_("skipping incremental-repack task because core.multiPackIndex is disabled")); + return 0; + } + + if (multi_pack_index_write(opts)) + return 1; + if (multi_pack_index_expire(opts)) + return 1; + if (multi_pack_index_repack(opts)) + return 1; + return 0; +} + +typedef int maintenance_task_fn(struct maintenance_run_opts *opts); + +/* + * An auto condition function returns 1 if the task should run + * and 0 if the task should NOT run. See needs_to_gc() for an + * example. + */ +typedef int maintenance_auto_fn(void); + +struct maintenance_task { + const char *name; + maintenance_task_fn *fn; + maintenance_auto_fn *auto_condition; + unsigned enabled:1; + + enum schedule_priority schedule; + + /* -1 if not selected. */ + int selected_order; +}; + +enum maintenance_task_label { + TASK_PREFETCH, + TASK_LOOSE_OBJECTS, + TASK_INCREMENTAL_REPACK, + TASK_GC, + TASK_COMMIT_GRAPH, + TASK_PACK_REFS, + + /* Leave as final value */ + TASK__COUNT +}; + +static struct maintenance_task tasks[] = { + [TASK_PREFETCH] = { + "prefetch", + maintenance_task_prefetch, + }, + [TASK_LOOSE_OBJECTS] = { + "loose-objects", + maintenance_task_loose_objects, + loose_object_auto_condition, + }, + [TASK_INCREMENTAL_REPACK] = { + "incremental-repack", + maintenance_task_incremental_repack, + incremental_repack_auto_condition, + }, + [TASK_GC] = { + "gc", + maintenance_task_gc, + need_to_gc, + 1, + }, + [TASK_COMMIT_GRAPH] = { + "commit-graph", + maintenance_task_commit_graph, + should_write_commit_graph, + }, + [TASK_PACK_REFS] = { + "pack-refs", + maintenance_task_pack_refs, + NULL, + }, +}; + +static int compare_tasks_by_selection(const void *a_, const void *b_) +{ + const struct maintenance_task *a = a_; + const struct maintenance_task *b = b_; + + return b->selected_order - a->selected_order; +} + +static int maintenance_run_tasks(struct maintenance_run_opts *opts) +{ + int i, found_selected = 0; + int result = 0; + struct lock_file lk; + struct repository *r = the_repository; + char *lock_path = xstrfmt("%s/maintenance", r->objects->odb->path); + + if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) { + /* + * Another maintenance command is running. + * + * If --auto was provided, then it is likely due to a + * recursive process stack. Do not report an error in + * that case. + */ + if (!opts->auto_flag && !opts->quiet) + warning(_("lock file '%s' exists, skipping maintenance"), + lock_path); + free(lock_path); + return 0; + } + free(lock_path); + + for (i = 0; !found_selected && i < TASK__COUNT; i++) + found_selected = tasks[i].selected_order >= 0; + + if (found_selected) + QSORT(tasks, TASK__COUNT, compare_tasks_by_selection); + + for (i = 0; i < TASK__COUNT; i++) { + if (found_selected && tasks[i].selected_order < 0) + continue; + + if (!found_selected && !tasks[i].enabled) + continue; + + if (opts->auto_flag && + (!tasks[i].auto_condition || + !tasks[i].auto_condition())) + continue; + + if (opts->schedule && tasks[i].schedule < opts->schedule) + continue; + + trace2_region_enter("maintenance", tasks[i].name, r); + if (tasks[i].fn(opts)) { + error(_("task '%s' failed"), tasks[i].name); + result = 1; + } + trace2_region_leave("maintenance", tasks[i].name, r); + } + + rollback_lock_file(&lk); + return result; +} + +static void initialize_maintenance_strategy(void) +{ + char *config_str; + + if (git_config_get_string("maintenance.strategy", &config_str)) + return; + + if (!strcasecmp(config_str, "incremental")) { + tasks[TASK_GC].schedule = SCHEDULE_NONE; + tasks[TASK_COMMIT_GRAPH].enabled = 1; + tasks[TASK_COMMIT_GRAPH].schedule = SCHEDULE_HOURLY; + tasks[TASK_PREFETCH].enabled = 1; + tasks[TASK_PREFETCH].schedule = SCHEDULE_HOURLY; + tasks[TASK_INCREMENTAL_REPACK].enabled = 1; + tasks[TASK_INCREMENTAL_REPACK].schedule = SCHEDULE_DAILY; + tasks[TASK_LOOSE_OBJECTS].enabled = 1; + tasks[TASK_LOOSE_OBJECTS].schedule = SCHEDULE_DAILY; + tasks[TASK_PACK_REFS].enabled = 1; + tasks[TASK_PACK_REFS].schedule = SCHEDULE_WEEKLY; + } +} + +static void initialize_task_config(int schedule) +{ + int i; + struct strbuf config_name = STRBUF_INIT; + gc_config(); + + if (schedule) + initialize_maintenance_strategy(); + + for (i = 0; i < TASK__COUNT; i++) { + int config_value; + char *config_str; + + strbuf_reset(&config_name); + strbuf_addf(&config_name, "maintenance.%s.enabled", + tasks[i].name); + + if (!git_config_get_bool(config_name.buf, &config_value)) + tasks[i].enabled = config_value; + + strbuf_reset(&config_name); + strbuf_addf(&config_name, "maintenance.%s.schedule", + tasks[i].name); + + if (!git_config_get_string(config_name.buf, &config_str)) { + tasks[i].schedule = parse_schedule(config_str); + free(config_str); + } + } + + strbuf_release(&config_name); +} + +static int task_option_parse(const struct option *opt UNUSED, + const char *arg, int unset) +{ + int i, num_selected = 0; + struct maintenance_task *task = NULL; + + BUG_ON_OPT_NEG(unset); + + for (i = 0; i < TASK__COUNT; i++) { + if (tasks[i].selected_order >= 0) + num_selected++; + if (!strcasecmp(tasks[i].name, arg)) { + task = &tasks[i]; + } + } + + if (!task) { + error(_("'%s' is not a valid task"), arg); + return 1; + } + + if (task->selected_order >= 0) { + error(_("task '%s' cannot be selected multiple times"), arg); + return 1; + } + + task->selected_order = num_selected + 1; + + return 0; +} + +static int maintenance_run(int argc, const char **argv, const char *prefix) +{ + int i; + struct maintenance_run_opts opts; + struct option builtin_maintenance_run_options[] = { + OPT_BOOL(0, "auto", &opts.auto_flag, + N_("run tasks based on the state of the repository")), + OPT_CALLBACK(0, "schedule", &opts.schedule, N_("frequency"), + N_("run tasks based on frequency"), + maintenance_opt_schedule), + OPT_BOOL(0, "quiet", &opts.quiet, + N_("do not report progress or other information over stderr")), + OPT_CALLBACK_F(0, "task", NULL, N_("task"), + N_("run a specific task"), + PARSE_OPT_NONEG, task_option_parse), + OPT_END() + }; + memset(&opts, 0, sizeof(opts)); + + opts.quiet = !isatty(2); + + for (i = 0; i < TASK__COUNT; i++) + tasks[i].selected_order = -1; + + argc = parse_options(argc, argv, prefix, + builtin_maintenance_run_options, + builtin_maintenance_run_usage, + PARSE_OPT_STOP_AT_NON_OPTION); + + if (opts.auto_flag && opts.schedule) + die(_("use at most one of --auto and --schedule=<frequency>")); + + initialize_task_config(opts.schedule); + + if (argc != 0) + usage_with_options(builtin_maintenance_run_usage, + builtin_maintenance_run_options); + return maintenance_run_tasks(&opts); +} + +static char *get_maintpath(void) +{ + struct strbuf sb = STRBUF_INIT; + const char *p = the_repository->worktree ? + the_repository->worktree : the_repository->gitdir; + + strbuf_realpath(&sb, p, 1); + return strbuf_detach(&sb, NULL); +} + +static char const * const builtin_maintenance_register_usage[] = { + "git maintenance register [--config-file <path>]", + NULL +}; + +static int maintenance_register(int argc, const char **argv, const char *prefix) +{ + char *config_file = NULL; + struct option options[] = { + OPT_STRING(0, "config-file", &config_file, N_("file"), N_("use given config file")), + OPT_END(), + }; + int found = 0; + const char *key = "maintenance.repo"; + char *maintpath = get_maintpath(); + struct string_list_item *item; + const struct string_list *list; + + argc = parse_options(argc, argv, prefix, options, + builtin_maintenance_register_usage, 0); + if (argc) + usage_with_options(builtin_maintenance_register_usage, + options); + + /* Disable foreground maintenance */ + git_config_set("maintenance.auto", "false"); + + /* Set maintenance strategy, if unset */ + if (git_config_get("maintenance.strategy")) + git_config_set("maintenance.strategy", "incremental"); + + if (!git_config_get_string_multi(key, &list)) { + for_each_string_list_item(item, list) { + if (!strcmp(maintpath, item->string)) { + found = 1; + break; + } + } + } + + if (!found) { + int rc; + char *user_config = NULL, *xdg_config = NULL; + + if (!config_file) { + git_global_config(&user_config, &xdg_config); + config_file = user_config; + if (!user_config) + die(_("$HOME not set")); + } + rc = git_config_set_multivar_in_file_gently( + config_file, "maintenance.repo", maintpath, + CONFIG_REGEX_NONE, 0); + free(user_config); + free(xdg_config); + + if (rc) + die(_("unable to add '%s' value of '%s'"), + key, maintpath); + } + + free(maintpath); + return 0; +} + +static char const * const builtin_maintenance_unregister_usage[] = { + "git maintenance unregister [--config-file <path>] [--force]", + NULL +}; + +static int maintenance_unregister(int argc, const char **argv, const char *prefix) +{ + int force = 0; + char *config_file = NULL; + struct option options[] = { + OPT_STRING(0, "config-file", &config_file, N_("file"), N_("use given config file")), + OPT__FORCE(&force, + N_("return success even if repository was not registered"), + PARSE_OPT_NOCOMPLETE), + OPT_END(), + }; + const char *key = "maintenance.repo"; + char *maintpath = get_maintpath(); + int found = 0; + struct string_list_item *item; + const struct string_list *list; + struct config_set cs = { { 0 } }; + + argc = parse_options(argc, argv, prefix, options, + builtin_maintenance_unregister_usage, 0); + if (argc) + usage_with_options(builtin_maintenance_unregister_usage, + options); + + if (config_file) { + git_configset_init(&cs); + git_configset_add_file(&cs, config_file); + } + if (!(config_file + ? git_configset_get_string_multi(&cs, key, &list) + : git_config_get_string_multi(key, &list))) { + for_each_string_list_item(item, list) { + if (!strcmp(maintpath, item->string)) { + found = 1; + break; + } + } + } + + if (found) { + int rc; + char *user_config = NULL, *xdg_config = NULL; + if (!config_file) { + git_global_config(&user_config, &xdg_config); + config_file = user_config; + if (!user_config) + die(_("$HOME not set")); + } + rc = git_config_set_multivar_in_file_gently( + config_file, key, NULL, maintpath, + CONFIG_FLAGS_MULTI_REPLACE | CONFIG_FLAGS_FIXED_VALUE); + free(user_config); + free(xdg_config); + + if (rc && + (!force || rc == CONFIG_NOTHING_SET)) + die(_("unable to unset '%s' value of '%s'"), + key, maintpath); + } else if (!force) { + die(_("repository '%s' is not registered"), maintpath); + } + + git_configset_clear(&cs); + free(maintpath); + return 0; +} + +static const char *get_frequency(enum schedule_priority schedule) +{ + switch (schedule) { + case SCHEDULE_HOURLY: + return "hourly"; + case SCHEDULE_DAILY: + return "daily"; + case SCHEDULE_WEEKLY: + return "weekly"; + default: + BUG("invalid schedule %d", schedule); + } +} + +/* + * get_schedule_cmd` reads the GIT_TEST_MAINT_SCHEDULER environment variable + * to mock the schedulers that `git maintenance start` rely on. + * + * For test purpose, GIT_TEST_MAINT_SCHEDULER can be set to a comma-separated + * list of colon-separated key/value pairs where each pair contains a scheduler + * and its corresponding mock. + * + * * If $GIT_TEST_MAINT_SCHEDULER is not set, return false and leave the + * arguments unmodified. + * + * * If $GIT_TEST_MAINT_SCHEDULER is set, return true. + * In this case, the *cmd value is read as input. + * + * * if the input value *cmd is the key of one of the comma-separated list + * item, then *is_available is set to true and *cmd is modified and becomes + * the mock command. + * + * * if the input value *cmd isn’t the key of any of the comma-separated list + * item, then *is_available is set to false. + * + * Ex.: + * GIT_TEST_MAINT_SCHEDULER not set + * +-------+-------------------------------------------------+ + * | Input | Output | + * | *cmd | return code | *cmd | *is_available | + * +-------+-------------+-------------------+---------------+ + * | "foo" | false | "foo" (unchanged) | (unchanged) | + * +-------+-------------+-------------------+---------------+ + * + * GIT_TEST_MAINT_SCHEDULER set to “foo:./mock_foo.sh,bar:./mock_bar.sh” + * +-------+-------------------------------------------------+ + * | Input | Output | + * | *cmd | return code | *cmd | *is_available | + * +-------+-------------+-------------------+---------------+ + * | "foo" | true | "./mock.foo.sh" | true | + * | "qux" | true | "qux" (unchanged) | false | + * +-------+-------------+-------------------+---------------+ + */ +static int get_schedule_cmd(const char **cmd, int *is_available) +{ + char *testing = xstrdup_or_null(getenv("GIT_TEST_MAINT_SCHEDULER")); + struct string_list_item *item; + struct string_list list = STRING_LIST_INIT_NODUP; + + if (!testing) + return 0; + + if (is_available) + *is_available = 0; + + string_list_split_in_place(&list, testing, ",", -1); + for_each_string_list_item(item, &list) { + struct string_list pair = STRING_LIST_INIT_NODUP; + + if (string_list_split_in_place(&pair, item->string, ":", 2) != 2) + continue; + + if (!strcmp(*cmd, pair.items[0].string)) { + *cmd = pair.items[1].string; + if (is_available) + *is_available = 1; + string_list_clear(&list, 0); + UNLEAK(testing); + return 1; + } + } + + string_list_clear(&list, 0); + free(testing); + return 1; +} + +static int get_random_minute(void) +{ + /* Use a static value when under tests. */ + if (getenv("GIT_TEST_MAINT_SCHEDULER")) + return 13; + + return git_rand() % 60; +} + +static int is_launchctl_available(void) +{ + const char *cmd = "launchctl"; + int is_available; + if (get_schedule_cmd(&cmd, &is_available)) + return is_available; + +#ifdef __APPLE__ + return 1; +#else + return 0; +#endif +} + +static char *launchctl_service_name(const char *frequency) +{ + struct strbuf label = STRBUF_INIT; + strbuf_addf(&label, "org.git-scm.git.%s", frequency); + return strbuf_detach(&label, NULL); +} + +static char *launchctl_service_filename(const char *name) +{ + char *expanded; + struct strbuf filename = STRBUF_INIT; + strbuf_addf(&filename, "~/Library/LaunchAgents/%s.plist", name); + + expanded = interpolate_path(filename.buf, 1); + if (!expanded) + die(_("failed to expand path '%s'"), filename.buf); + + strbuf_release(&filename); + return expanded; +} + +static char *launchctl_get_uid(void) +{ + return xstrfmt("gui/%d", getuid()); +} + +static int launchctl_boot_plist(int enable, const char *filename) +{ + const char *cmd = "launchctl"; + int result; + struct child_process child = CHILD_PROCESS_INIT; + char *uid = launchctl_get_uid(); + + get_schedule_cmd(&cmd, NULL); + strvec_split(&child.args, cmd); + strvec_pushl(&child.args, enable ? "bootstrap" : "bootout", uid, + filename, NULL); + + child.no_stderr = 1; + child.no_stdout = 1; + + if (start_command(&child)) + die(_("failed to start launchctl")); + + result = finish_command(&child); + + free(uid); + return result; +} + +static int launchctl_remove_plist(enum schedule_priority schedule) +{ + const char *frequency = get_frequency(schedule); + char *name = launchctl_service_name(frequency); + char *filename = launchctl_service_filename(name); + int result = launchctl_boot_plist(0, filename); + unlink(filename); + free(filename); + free(name); + return result; +} + +static int launchctl_remove_plists(void) +{ + return launchctl_remove_plist(SCHEDULE_HOURLY) || + launchctl_remove_plist(SCHEDULE_DAILY) || + launchctl_remove_plist(SCHEDULE_WEEKLY); +} + +static int launchctl_list_contains_plist(const char *name, const char *cmd) +{ + struct child_process child = CHILD_PROCESS_INIT; + + strvec_split(&child.args, cmd); + strvec_pushl(&child.args, "list", name, NULL); + + child.no_stderr = 1; + child.no_stdout = 1; + + if (start_command(&child)) + die(_("failed to start launchctl")); + + /* Returns failure if 'name' doesn't exist. */ + return !finish_command(&child); +} + +static int launchctl_schedule_plist(const char *exec_path, enum schedule_priority schedule) +{ + int i, fd; + const char *preamble, *repeat; + const char *frequency = get_frequency(schedule); + char *name = launchctl_service_name(frequency); + char *filename = launchctl_service_filename(name); + struct lock_file lk = LOCK_INIT; + static unsigned long lock_file_timeout_ms = ULONG_MAX; + struct strbuf plist = STRBUF_INIT, plist2 = STRBUF_INIT; + struct stat st; + const char *cmd = "launchctl"; + int minute = get_random_minute(); + + get_schedule_cmd(&cmd, NULL); + preamble = "<?xml version=\"1.0\"?>\n" + "<!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\">\n" + "<plist version=\"1.0\">" + "<dict>\n" + "<key>Label</key><string>%s</string>\n" + "<key>ProgramArguments</key>\n" + "<array>\n" + "<string>%s/git</string>\n" + "<string>--exec-path=%s</string>\n" + "<string>for-each-repo</string>\n" + "<string>--config=maintenance.repo</string>\n" + "<string>maintenance</string>\n" + "<string>run</string>\n" + "<string>--schedule=%s</string>\n" + "</array>\n" + "<key>StartCalendarInterval</key>\n" + "<array>\n"; + strbuf_addf(&plist, preamble, name, exec_path, exec_path, frequency); + + switch (schedule) { + case SCHEDULE_HOURLY: + repeat = "<dict>\n" + "<key>Hour</key><integer>%d</integer>\n" + "<key>Minute</key><integer>%d</integer>\n" + "</dict>\n"; + for (i = 1; i <= 23; i++) + strbuf_addf(&plist, repeat, i, minute); + break; + + case SCHEDULE_DAILY: + repeat = "<dict>\n" + "<key>Day</key><integer>%d</integer>\n" + "<key>Hour</key><integer>0</integer>\n" + "<key>Minute</key><integer>%d</integer>\n" + "</dict>\n"; + for (i = 1; i <= 6; i++) + strbuf_addf(&plist, repeat, i, minute); + break; + + case SCHEDULE_WEEKLY: + strbuf_addf(&plist, + "<dict>\n" + "<key>Day</key><integer>0</integer>\n" + "<key>Hour</key><integer>0</integer>\n" + "<key>Minute</key><integer>%d</integer>\n" + "</dict>\n", + minute); + break; + + default: + /* unreachable */ + break; + } + strbuf_addstr(&plist, "</array>\n</dict>\n</plist>\n"); + + if (safe_create_leading_directories(filename)) + die(_("failed to create directories for '%s'"), filename); + + if ((long)lock_file_timeout_ms < 0 && + git_config_get_ulong("gc.launchctlplistlocktimeoutms", + &lock_file_timeout_ms)) + lock_file_timeout_ms = 150; + + fd = hold_lock_file_for_update_timeout(&lk, filename, LOCK_DIE_ON_ERROR, + lock_file_timeout_ms); + + /* + * Does this file already exist? With the intended contents? Is it + * registered already? Then it does not need to be re-registered. + */ + if (!stat(filename, &st) && st.st_size == plist.len && + strbuf_read_file(&plist2, filename, plist.len) == plist.len && + !strbuf_cmp(&plist, &plist2) && + launchctl_list_contains_plist(name, cmd)) + rollback_lock_file(&lk); + else { + if (write_in_full(fd, plist.buf, plist.len) < 0 || + commit_lock_file(&lk)) + die_errno(_("could not write '%s'"), filename); + + /* bootout might fail if not already running, so ignore */ + launchctl_boot_plist(0, filename); + if (launchctl_boot_plist(1, filename)) + die(_("failed to bootstrap service %s"), filename); + } + + free(filename); + free(name); + strbuf_release(&plist); + strbuf_release(&plist2); + return 0; +} + +static int launchctl_add_plists(void) +{ + const char *exec_path = git_exec_path(); + + return launchctl_schedule_plist(exec_path, SCHEDULE_HOURLY) || + launchctl_schedule_plist(exec_path, SCHEDULE_DAILY) || + launchctl_schedule_plist(exec_path, SCHEDULE_WEEKLY); +} + +static int launchctl_update_schedule(int run_maintenance, int fd UNUSED) +{ + if (run_maintenance) + return launchctl_add_plists(); + else + return launchctl_remove_plists(); +} + +static int is_schtasks_available(void) +{ + const char *cmd = "schtasks"; + int is_available; + if (get_schedule_cmd(&cmd, &is_available)) + return is_available; + +#ifdef GIT_WINDOWS_NATIVE + return 1; +#else + return 0; +#endif +} + +static char *schtasks_task_name(const char *frequency) +{ + struct strbuf label = STRBUF_INIT; + strbuf_addf(&label, "Git Maintenance (%s)", frequency); + return strbuf_detach(&label, NULL); +} + +static int schtasks_remove_task(enum schedule_priority schedule) +{ + const char *cmd = "schtasks"; + struct child_process child = CHILD_PROCESS_INIT; + const char *frequency = get_frequency(schedule); + char *name = schtasks_task_name(frequency); + + get_schedule_cmd(&cmd, NULL); + strvec_split(&child.args, cmd); + strvec_pushl(&child.args, "/delete", "/tn", name, "/f", NULL); + free(name); + + return run_command(&child); +} + +static int schtasks_remove_tasks(void) +{ + return schtasks_remove_task(SCHEDULE_HOURLY) || + schtasks_remove_task(SCHEDULE_DAILY) || + schtasks_remove_task(SCHEDULE_WEEKLY); +} + +static int schtasks_schedule_task(const char *exec_path, enum schedule_priority schedule) +{ + const char *cmd = "schtasks"; + int result; + struct child_process child = CHILD_PROCESS_INIT; + const char *xml; + struct tempfile *tfile; + const char *frequency = get_frequency(schedule); + char *name = schtasks_task_name(frequency); + struct strbuf tfilename = STRBUF_INIT; + int minute = get_random_minute(); + + get_schedule_cmd(&cmd, NULL); + + strbuf_addf(&tfilename, "%s/schedule_%s_XXXXXX", + get_git_common_dir(), frequency); + tfile = xmks_tempfile(tfilename.buf); + strbuf_release(&tfilename); + + if (!fdopen_tempfile(tfile, "w")) + die(_("failed to create temp xml file")); + + xml = "<?xml version=\"1.0\" ?>\n" + "<Task version=\"1.4\" xmlns=\"http://schemas.microsoft.com/windows/2004/02/mit/task\">\n" + "<Triggers>\n" + "<CalendarTrigger>\n"; + fputs(xml, tfile->fp); + + switch (schedule) { + case SCHEDULE_HOURLY: + fprintf(tfile->fp, + "<StartBoundary>2020-01-01T01:%02d:00</StartBoundary>\n" + "<Enabled>true</Enabled>\n" + "<ScheduleByDay>\n" + "<DaysInterval>1</DaysInterval>\n" + "</ScheduleByDay>\n" + "<Repetition>\n" + "<Interval>PT1H</Interval>\n" + "<Duration>PT23H</Duration>\n" + "<StopAtDurationEnd>false</StopAtDurationEnd>\n" + "</Repetition>\n", + minute); + break; + + case SCHEDULE_DAILY: + fprintf(tfile->fp, + "<StartBoundary>2020-01-01T00:%02d:00</StartBoundary>\n" + "<Enabled>true</Enabled>\n" + "<ScheduleByWeek>\n" + "<DaysOfWeek>\n" + "<Monday />\n" + "<Tuesday />\n" + "<Wednesday />\n" + "<Thursday />\n" + "<Friday />\n" + "<Saturday />\n" + "</DaysOfWeek>\n" + "<WeeksInterval>1</WeeksInterval>\n" + "</ScheduleByWeek>\n", + minute); + break; + + case SCHEDULE_WEEKLY: + fprintf(tfile->fp, + "<StartBoundary>2020-01-01T00:%02d:00</StartBoundary>\n" + "<Enabled>true</Enabled>\n" + "<ScheduleByWeek>\n" + "<DaysOfWeek>\n" + "<Sunday />\n" + "</DaysOfWeek>\n" + "<WeeksInterval>1</WeeksInterval>\n" + "</ScheduleByWeek>\n", + minute); + break; + + default: + break; + } + + xml = "</CalendarTrigger>\n" + "</Triggers>\n" + "<Principals>\n" + "<Principal id=\"Author\">\n" + "<LogonType>InteractiveToken</LogonType>\n" + "<RunLevel>LeastPrivilege</RunLevel>\n" + "</Principal>\n" + "</Principals>\n" + "<Settings>\n" + "<MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>\n" + "<Enabled>true</Enabled>\n" + "<Hidden>true</Hidden>\n" + "<UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>\n" + "<WakeToRun>false</WakeToRun>\n" + "<ExecutionTimeLimit>PT72H</ExecutionTimeLimit>\n" + "<Priority>7</Priority>\n" + "</Settings>\n" + "<Actions Context=\"Author\">\n" + "<Exec>\n" + "<Command>\"%s\\headless-git.exe\"</Command>\n" + "<Arguments>--exec-path=\"%s\" for-each-repo --config=maintenance.repo maintenance run --schedule=%s</Arguments>\n" + "</Exec>\n" + "</Actions>\n" + "</Task>\n"; + fprintf(tfile->fp, xml, exec_path, exec_path, frequency); + strvec_split(&child.args, cmd); + strvec_pushl(&child.args, "/create", "/tn", name, "/f", "/xml", + get_tempfile_path(tfile), NULL); + close_tempfile_gently(tfile); + + child.no_stdout = 1; + child.no_stderr = 1; + + if (start_command(&child)) + die(_("failed to start schtasks")); + result = finish_command(&child); + + delete_tempfile(&tfile); + free(name); + return result; +} + +static int schtasks_schedule_tasks(void) +{ + const char *exec_path = git_exec_path(); + + return schtasks_schedule_task(exec_path, SCHEDULE_HOURLY) || + schtasks_schedule_task(exec_path, SCHEDULE_DAILY) || + schtasks_schedule_task(exec_path, SCHEDULE_WEEKLY); +} + +static int schtasks_update_schedule(int run_maintenance, int fd UNUSED) +{ + if (run_maintenance) + return schtasks_schedule_tasks(); + else + return schtasks_remove_tasks(); +} + +MAYBE_UNUSED +static int check_crontab_process(const char *cmd) +{ + struct child_process child = CHILD_PROCESS_INIT; + + strvec_split(&child.args, cmd); + strvec_push(&child.args, "-l"); + child.no_stdin = 1; + child.no_stdout = 1; + child.no_stderr = 1; + child.silent_exec_failure = 1; + + if (start_command(&child)) + return 0; + /* Ignore exit code, as an empty crontab will return error. */ + finish_command(&child); + return 1; +} + +static int is_crontab_available(void) +{ + const char *cmd = "crontab"; + int is_available; + + if (get_schedule_cmd(&cmd, &is_available)) + return is_available; + +#ifdef __APPLE__ + /* + * macOS has cron, but it requires special permissions and will + * create a UI alert when attempting to run this command. + */ + return 0; +#else + return check_crontab_process(cmd); +#endif +} + +#define BEGIN_LINE "# BEGIN GIT MAINTENANCE SCHEDULE" +#define END_LINE "# END GIT MAINTENANCE SCHEDULE" + +static int crontab_update_schedule(int run_maintenance, int fd) +{ + const char *cmd = "crontab"; + int result = 0; + int in_old_region = 0; + struct child_process crontab_list = CHILD_PROCESS_INIT; + struct child_process crontab_edit = CHILD_PROCESS_INIT; + FILE *cron_list, *cron_in; + struct strbuf line = STRBUF_INIT; + struct tempfile *tmpedit = NULL; + int minute = get_random_minute(); + + get_schedule_cmd(&cmd, NULL); + strvec_split(&crontab_list.args, cmd); + strvec_push(&crontab_list.args, "-l"); + crontab_list.in = -1; + crontab_list.out = dup(fd); + crontab_list.git_cmd = 0; + + if (start_command(&crontab_list)) + return error(_("failed to run 'crontab -l'; your system might not support 'cron'")); + + /* Ignore exit code, as an empty crontab will return error. */ + finish_command(&crontab_list); + + tmpedit = mks_tempfile_t(".git_cron_edit_tmpXXXXXX"); + if (!tmpedit) { + result = error(_("failed to create crontab temporary file")); + goto out; + } + cron_in = fdopen_tempfile(tmpedit, "w"); + if (!cron_in) { + result = error(_("failed to open temporary file")); + goto out; + } + + /* + * Read from the .lock file, filtering out the old + * schedule while appending the new schedule. + */ + cron_list = fdopen(fd, "r"); + rewind(cron_list); + + while (!strbuf_getline_lf(&line, cron_list)) { + if (!in_old_region && !strcmp(line.buf, BEGIN_LINE)) + in_old_region = 1; + else if (in_old_region && !strcmp(line.buf, END_LINE)) + in_old_region = 0; + else if (!in_old_region) + fprintf(cron_in, "%s\n", line.buf); + } + strbuf_release(&line); + + if (run_maintenance) { + struct strbuf line_format = STRBUF_INIT; + const char *exec_path = git_exec_path(); + + fprintf(cron_in, "%s\n", BEGIN_LINE); + fprintf(cron_in, + "# The following schedule was created by Git\n"); + fprintf(cron_in, "# Any edits made in this region might be\n"); + fprintf(cron_in, + "# replaced in the future by a Git command.\n\n"); + + strbuf_addf(&line_format, + "%%d %%s * * %%s \"%s/git\" --exec-path=\"%s\" for-each-repo --config=maintenance.repo maintenance run --schedule=%%s\n", + exec_path, exec_path); + fprintf(cron_in, line_format.buf, minute, "1-23", "*", "hourly"); + fprintf(cron_in, line_format.buf, minute, "0", "1-6", "daily"); + fprintf(cron_in, line_format.buf, minute, "0", "0", "weekly"); + strbuf_release(&line_format); + + fprintf(cron_in, "\n%s\n", END_LINE); + } + + fflush(cron_in); + + strvec_split(&crontab_edit.args, cmd); + strvec_push(&crontab_edit.args, get_tempfile_path(tmpedit)); + crontab_edit.git_cmd = 0; + + if (start_command(&crontab_edit)) { + result = error(_("failed to run 'crontab'; your system might not support 'cron'")); + goto out; + } + + if (finish_command(&crontab_edit)) + result = error(_("'crontab' died")); + else + fclose(cron_list); +out: + delete_tempfile(&tmpedit); + return result; +} + +static int real_is_systemd_timer_available(void) +{ + struct child_process child = CHILD_PROCESS_INIT; + + strvec_pushl(&child.args, "systemctl", "--user", "list-timers", NULL); + child.no_stdin = 1; + child.no_stdout = 1; + child.no_stderr = 1; + child.silent_exec_failure = 1; + + if (start_command(&child)) + return 0; + if (finish_command(&child)) + return 0; + return 1; +} + +static int is_systemd_timer_available(void) +{ + const char *cmd = "systemctl"; + int is_available; + + if (get_schedule_cmd(&cmd, &is_available)) + return is_available; + + return real_is_systemd_timer_available(); +} + +static char *xdg_config_home_systemd(const char *filename) +{ + return xdg_config_home_for("systemd/user", filename); +} + +#define SYSTEMD_UNIT_FORMAT "git-maintenance@%s.%s" + +static int systemd_timer_delete_timer_file(enum schedule_priority priority) +{ + int ret = 0; + const char *frequency = get_frequency(priority); + char *local_timer_name = xstrfmt(SYSTEMD_UNIT_FORMAT, frequency, "timer"); + char *filename = xdg_config_home_systemd(local_timer_name); + + if (unlink(filename) && !is_missing_file_error(errno)) + ret = error_errno(_("failed to delete '%s'"), filename); + + free(filename); + free(local_timer_name); + return ret; +} + +static int systemd_timer_delete_service_template(void) +{ + int ret = 0; + char *local_service_name = xstrfmt(SYSTEMD_UNIT_FORMAT, "", "service"); + char *filename = xdg_config_home_systemd(local_service_name); + if (unlink(filename) && !is_missing_file_error(errno)) + ret = error_errno(_("failed to delete '%s'"), filename); + + free(filename); + free(local_service_name); + return ret; +} + +/* + * Write the schedule information into a git-maintenance@<schedule>.timer + * file using a custom minute. This timer file cannot use the templating + * system, so we generate a specific file for each. + */ +static int systemd_timer_write_timer_file(enum schedule_priority schedule, + int minute) +{ + int res = -1; + char *filename; + FILE *file; + const char *unit; + char *schedule_pattern = NULL; + const char *frequency = get_frequency(schedule); + char *local_timer_name = xstrfmt(SYSTEMD_UNIT_FORMAT, frequency, "timer"); + + filename = xdg_config_home_systemd(local_timer_name); + + if (safe_create_leading_directories(filename)) { + error(_("failed to create directories for '%s'"), filename); + goto error; + } + file = fopen_or_warn(filename, "w"); + if (!file) + goto error; + + switch (schedule) { + case SCHEDULE_HOURLY: + schedule_pattern = xstrfmt("*-*-* 1..23:%02d:00", minute); + break; + + case SCHEDULE_DAILY: + schedule_pattern = xstrfmt("Tue..Sun *-*-* 0:%02d:00", minute); + break; + + case SCHEDULE_WEEKLY: + schedule_pattern = xstrfmt("Mon 0:%02d:00", minute); + break; + + default: + BUG("Unhandled schedule_priority"); + } + + unit = "# This file was created and is maintained by Git.\n" + "# Any edits made in this file might be replaced in the future\n" + "# by a Git command.\n" + "\n" + "[Unit]\n" + "Description=Optimize Git repositories data\n" + "\n" + "[Timer]\n" + "OnCalendar=%s\n" + "Persistent=true\n" + "\n" + "[Install]\n" + "WantedBy=timers.target\n"; + if (fprintf(file, unit, schedule_pattern) < 0) { + error(_("failed to write to '%s'"), filename); + fclose(file); + goto error; + } + if (fclose(file) == EOF) { + error_errno(_("failed to flush '%s'"), filename); + goto error; + } + + res = 0; + +error: + free(schedule_pattern); + free(local_timer_name); + free(filename); + return res; +} + +/* + * No matter the schedule, we use the same service and can make use of the + * templating system. When installing git-maintenance@<schedule>.timer, + * systemd will notice that git-maintenance@.service exists as a template + * and will use this file and insert the <schedule> into the template at + * the position of "%i". + */ +static int systemd_timer_write_service_template(const char *exec_path) +{ + int res = -1; + char *filename; + FILE *file; + const char *unit; + char *local_service_name = xstrfmt(SYSTEMD_UNIT_FORMAT, "", "service"); + + filename = xdg_config_home_systemd(local_service_name); + if (safe_create_leading_directories(filename)) { + error(_("failed to create directories for '%s'"), filename); + goto error; + } + file = fopen_or_warn(filename, "w"); + if (!file) + goto error; + + unit = "# This file was created and is maintained by Git.\n" + "# Any edits made in this file might be replaced in the future\n" + "# by a Git command.\n" + "\n" + "[Unit]\n" + "Description=Optimize Git repositories data\n" + "\n" + "[Service]\n" + "Type=oneshot\n" + "ExecStart=\"%s/git\" --exec-path=\"%s\" for-each-repo --config=maintenance.repo maintenance run --schedule=%%i\n" + "LockPersonality=yes\n" + "MemoryDenyWriteExecute=yes\n" + "NoNewPrivileges=yes\n" + "RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 AF_VSOCK\n" + "RestrictNamespaces=yes\n" + "RestrictRealtime=yes\n" + "RestrictSUIDSGID=yes\n" + "SystemCallArchitectures=native\n" + "SystemCallFilter=@system-service\n"; + if (fprintf(file, unit, exec_path, exec_path) < 0) { + error(_("failed to write to '%s'"), filename); + fclose(file); + goto error; + } + if (fclose(file) == EOF) { + error_errno(_("failed to flush '%s'"), filename); + goto error; + } + + res = 0; + +error: + free(local_service_name); + free(filename); + return res; +} + +static int systemd_timer_enable_unit(int enable, + enum schedule_priority schedule, + int minute) +{ + const char *cmd = "systemctl"; + struct child_process child = CHILD_PROCESS_INIT; + const char *frequency = get_frequency(schedule); + + /* + * Disabling the systemd unit while it is already disabled makes + * systemctl print an error. + * Let's ignore it since it means we already are in the expected state: + * the unit is disabled. + * + * On the other hand, enabling a systemd unit which is already enabled + * produces no error. + */ + if (!enable) + child.no_stderr = 1; + else if (systemd_timer_write_timer_file(schedule, minute)) + return -1; + + get_schedule_cmd(&cmd, NULL); + strvec_split(&child.args, cmd); + strvec_pushl(&child.args, "--user", enable ? "enable" : "disable", + "--now", NULL); + strvec_pushf(&child.args, SYSTEMD_UNIT_FORMAT, frequency, "timer"); + + if (start_command(&child)) + return error(_("failed to start systemctl")); + if (finish_command(&child)) + /* + * Disabling an already disabled systemd unit makes + * systemctl fail. + * Let's ignore this failure. + * + * Enabling an enabled systemd unit doesn't fail. + */ + if (enable) + return error(_("failed to run systemctl")); + return 0; +} + +/* + * A previous version of Git wrote the timer units as template files. + * Clean these up, if they exist. + */ +static void systemd_timer_delete_stale_timer_templates(void) +{ + char *timer_template_name = xstrfmt(SYSTEMD_UNIT_FORMAT, "", "timer"); + char *filename = xdg_config_home_systemd(timer_template_name); + + if (unlink(filename) && !is_missing_file_error(errno)) + warning(_("failed to delete '%s'"), filename); + + free(filename); + free(timer_template_name); +} + +static int systemd_timer_delete_unit_files(void) +{ + systemd_timer_delete_stale_timer_templates(); + + /* Purposefully not short-circuited to make sure all are called. */ + return systemd_timer_delete_timer_file(SCHEDULE_HOURLY) | + systemd_timer_delete_timer_file(SCHEDULE_DAILY) | + systemd_timer_delete_timer_file(SCHEDULE_WEEKLY) | + systemd_timer_delete_service_template(); +} + +static int systemd_timer_delete_units(void) +{ + int minute = get_random_minute(); + /* Purposefully not short-circuited to make sure all are called. */ + return systemd_timer_enable_unit(0, SCHEDULE_HOURLY, minute) | + systemd_timer_enable_unit(0, SCHEDULE_DAILY, minute) | + systemd_timer_enable_unit(0, SCHEDULE_WEEKLY, minute) | + systemd_timer_delete_unit_files(); +} + +static int systemd_timer_setup_units(void) +{ + int minute = get_random_minute(); + const char *exec_path = git_exec_path(); + + int ret = systemd_timer_write_service_template(exec_path) || + systemd_timer_enable_unit(1, SCHEDULE_HOURLY, minute) || + systemd_timer_enable_unit(1, SCHEDULE_DAILY, minute) || + systemd_timer_enable_unit(1, SCHEDULE_WEEKLY, minute); + + if (ret) + systemd_timer_delete_units(); + else + systemd_timer_delete_stale_timer_templates(); + + return ret; +} + +static int systemd_timer_update_schedule(int run_maintenance, int fd UNUSED) +{ + if (run_maintenance) + return systemd_timer_setup_units(); + else + return systemd_timer_delete_units(); +} + +enum scheduler { + SCHEDULER_INVALID = -1, + SCHEDULER_AUTO, + SCHEDULER_CRON, + SCHEDULER_SYSTEMD, + SCHEDULER_LAUNCHCTL, + SCHEDULER_SCHTASKS, +}; + +static const struct { + const char *name; + int (*is_available)(void); + int (*update_schedule)(int run_maintenance, int fd); +} scheduler_fn[] = { + [SCHEDULER_CRON] = { + .name = "crontab", + .is_available = is_crontab_available, + .update_schedule = crontab_update_schedule, + }, + [SCHEDULER_SYSTEMD] = { + .name = "systemctl", + .is_available = is_systemd_timer_available, + .update_schedule = systemd_timer_update_schedule, + }, + [SCHEDULER_LAUNCHCTL] = { + .name = "launchctl", + .is_available = is_launchctl_available, + .update_schedule = launchctl_update_schedule, + }, + [SCHEDULER_SCHTASKS] = { + .name = "schtasks", + .is_available = is_schtasks_available, + .update_schedule = schtasks_update_schedule, + }, +}; + +static enum scheduler parse_scheduler(const char *value) +{ + if (!value) + return SCHEDULER_INVALID; + else if (!strcasecmp(value, "auto")) + return SCHEDULER_AUTO; + else if (!strcasecmp(value, "cron") || !strcasecmp(value, "crontab")) + return SCHEDULER_CRON; + else if (!strcasecmp(value, "systemd") || + !strcasecmp(value, "systemd-timer")) + return SCHEDULER_SYSTEMD; + else if (!strcasecmp(value, "launchctl")) + return SCHEDULER_LAUNCHCTL; + else if (!strcasecmp(value, "schtasks")) + return SCHEDULER_SCHTASKS; + else + return SCHEDULER_INVALID; +} + +static int maintenance_opt_scheduler(const struct option *opt, const char *arg, + int unset) +{ + enum scheduler *scheduler = opt->value; + + BUG_ON_OPT_NEG(unset); + + *scheduler = parse_scheduler(arg); + if (*scheduler == SCHEDULER_INVALID) + return error(_("unrecognized --scheduler argument '%s'"), arg); + return 0; +} + +struct maintenance_start_opts { + enum scheduler scheduler; +}; + +static enum scheduler resolve_scheduler(enum scheduler scheduler) +{ + if (scheduler != SCHEDULER_AUTO) + return scheduler; + +#if defined(__APPLE__) + return SCHEDULER_LAUNCHCTL; + +#elif defined(GIT_WINDOWS_NATIVE) + return SCHEDULER_SCHTASKS; + +#elif defined(__linux__) + if (is_systemd_timer_available()) + return SCHEDULER_SYSTEMD; + else if (is_crontab_available()) + return SCHEDULER_CRON; + else + die(_("neither systemd timers nor crontab are available")); + +#else + return SCHEDULER_CRON; +#endif +} + +static void validate_scheduler(enum scheduler scheduler) +{ + if (scheduler == SCHEDULER_INVALID) + BUG("invalid scheduler"); + if (scheduler == SCHEDULER_AUTO) + BUG("resolve_scheduler should have been called before"); + + if (!scheduler_fn[scheduler].is_available()) + die(_("%s scheduler is not available"), + scheduler_fn[scheduler].name); +} + +static int update_background_schedule(const struct maintenance_start_opts *opts, + int enable) +{ + unsigned int i; + int result = 0; + struct lock_file lk; + char *lock_path = xstrfmt("%s/schedule", the_repository->objects->odb->path); + + if (hold_lock_file_for_update(&lk, lock_path, LOCK_NO_DEREF) < 0) { + free(lock_path); + return error(_("another process is scheduling background maintenance")); + } + + for (i = 1; i < ARRAY_SIZE(scheduler_fn); i++) { + if (enable && opts->scheduler == i) + continue; + if (!scheduler_fn[i].is_available()) + continue; + scheduler_fn[i].update_schedule(0, get_lock_file_fd(&lk)); + } + + if (enable) + result = scheduler_fn[opts->scheduler].update_schedule( + 1, get_lock_file_fd(&lk)); + + rollback_lock_file(&lk); + + free(lock_path); + return result; +} + +static const char *const builtin_maintenance_start_usage[] = { + N_("git maintenance start [--scheduler=<scheduler>]"), + NULL +}; + +static int maintenance_start(int argc, const char **argv, const char *prefix) +{ + struct maintenance_start_opts opts = { 0 }; + struct option options[] = { + OPT_CALLBACK_F( + 0, "scheduler", &opts.scheduler, N_("scheduler"), + N_("scheduler to trigger git maintenance run"), + PARSE_OPT_NONEG, maintenance_opt_scheduler), + OPT_END() + }; + const char *register_args[] = { "register", NULL }; + + argc = parse_options(argc, argv, prefix, options, + builtin_maintenance_start_usage, 0); + if (argc) + usage_with_options(builtin_maintenance_start_usage, options); + + opts.scheduler = resolve_scheduler(opts.scheduler); + validate_scheduler(opts.scheduler); + + if (update_background_schedule(&opts, 1)) + die(_("failed to set up maintenance schedule")); + + if (maintenance_register(ARRAY_SIZE(register_args)-1, register_args, NULL)) + warning(_("failed to add repo to global config")); + return 0; +} + +static const char *const builtin_maintenance_stop_usage[] = { + "git maintenance stop", + NULL +}; + +static int maintenance_stop(int argc, const char **argv, const char *prefix) +{ + struct option options[] = { + OPT_END() + }; + argc = parse_options(argc, argv, prefix, options, + builtin_maintenance_stop_usage, 0); + if (argc) + usage_with_options(builtin_maintenance_stop_usage, options); + return update_background_schedule(NULL, 0); +} + +static const char * const builtin_maintenance_usage[] = { + N_("git maintenance <subcommand> [<options>]"), + NULL, +}; + +int cmd_maintenance(int argc, const char **argv, const char *prefix) +{ + parse_opt_subcommand_fn *fn = NULL; + struct option builtin_maintenance_options[] = { + OPT_SUBCOMMAND("run", &fn, maintenance_run), + OPT_SUBCOMMAND("start", &fn, maintenance_start), + OPT_SUBCOMMAND("stop", &fn, maintenance_stop), + OPT_SUBCOMMAND("register", &fn, maintenance_register), + OPT_SUBCOMMAND("unregister", &fn, maintenance_unregister), + OPT_END(), + }; + + argc = parse_options(argc, argv, prefix, builtin_maintenance_options, + builtin_maintenance_usage, 0); + return fn(argc, argv, prefix); +} |