/* SPDX-License-Identifier: GPL-2.0 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "gcc-compat.h" #include "log.h" #include "str.h" #include "err.h" #include "file.h" #include "exec.h" #include "daemon.h" #include "sig.h" #include "df.h" #include "tv.h" #include "snap.h" #include "ipc.h" #include "dss.lsg.h" #define CMD_PTR(_cname) lls_cmd(LSG_DSS_CMD_ ## _cname, dss_suite) #define OPT_RESULT(_cname, _oname) (lls_opt_result(\ LSG_DSS_ ## _cname ## _OPT_ ## _oname, (CMD_PTR(_cname) == CMD_PTR(DSS))? lpr : sublpr)) #define OPT_GIVEN(_cname, _oname) (lls_opt_given(OPT_RESULT(_cname, _oname))) #define OPT_STRING_VAL(_cname, _oname) (lls_string_val(0, \ OPT_RESULT(_cname, _oname))) #define OPT_UINT32_VAL(_cname, _oname) (lls_uint32_val(0, \ OPT_RESULT(_cname, _oname))) struct dss_user_data {int (*handler)(void);}; #define EXPORT_CMD_HANDLER(_cmd) const struct dss_user_data \ lsg_dss_com_ ## _cmd ## _user_data = { \ .handler = com_ ## _cmd \ }; /* * Command line and active options. We need to keep a copy of the parsed * command line options for the SIGHUP case where we merge the command line * options and the new config file options. */ static struct lls_parse_result *cmdline_lpr, *lpr; /* Parsed subcommand options. */ static struct lls_parse_result *cmdline_sublpr, *sublpr; /* The executing subcommand (NULL at startup). */ static const struct lls_command *subcmd; /* Wether daemon_init() was called. */ static bool daemonized; /* Non-NULL if we log to a file. */ static FILE *logfile; /* Realpath of the config file. */ static char *config_file; /* derived from config file path */ uint32_t ipc_key; /* The read end of the signal pipe */ static int signal_pipe; /* Process id of current pre-create-hook/rsync/post-create-hook process. */ static pid_t create_pid; /* Whether the pre-create-hook/rsync/post-create-hook is currently stopped. */ static int create_process_stopped; /* How many times in a row the rsync command failed. */ static int num_consecutive_rsync_errors; /* Process id of current pre-remove/rm/post-remove process. */ static pid_t remove_pid; /* When the next snapshot is due. */ static int64_t next_snapshot_time; /* When to try to remove something. */ static struct timeval next_removal_check; /* Creation time of the snapshot currently being created. */ static int64_t current_snapshot_creation_time; /* Set by the pre-rm hook, cleared by handle_remove_exit(). */ struct snapshot *snapshot_currently_being_removed; /* Needed by the post-create hook. */ static char *path_to_last_complete_snapshot; static char *name_of_reference_snapshot; /* See snap.h for details. */ enum hook_status snapshot_creation_status; /* See snap.h for details. */ enum hook_status snapshot_removal_status; DEFINE_DSS_ERRLIST; static const char *hook_status_description[] = {HOOK_STATUS_ARRAY}; /* may be called with ds == NULL. */ static int disk_space_low(struct disk_space *ds) { struct disk_space ds_struct; uint32_t val; if (!ds) { int ret = get_disk_space(".", &ds_struct); if (ret < 0) return ret; ds = &ds_struct; } val = OPT_UINT32_VAL(DSS, MIN_FREE_MB); if (val != 0) if (ds->free_mb < val) return 1; val = OPT_UINT32_VAL(DSS, MIN_FREE_PERCENT); if (val != 0) if (ds->percent_free < val) return 1; val = OPT_UINT32_VAL(DSS, MIN_FREE_PERCENT_INODES); if (val != 0) if (ds->percent_free_inodes < val) return 1; return 0; } static void dump_dss_config(const char *msg) { const char dash[] = "-----------------------------"; char *lopsub_dump; int ret; FILE *log = logfile? logfile : stderr; struct disk_space ds; int64_t now = get_current_time(); if (OPT_UINT32_VAL(DSS, LOGLEVEL) > INFO) return; fprintf(log, "%s <%s config> %s\n", dash, msg, dash); fprintf(log, "\n*** disk space ***\n\n"); ret = get_disk_space(".", &ds); if (ret >= 0) { DSS_INFO_LOG("disk space low: %s\n", disk_space_low(&ds)? "yes" : "no"); log_disk_space(&ds); } else DSS_ERROR_LOG("can not get free disk space: %s\n", dss_strerror(-ret)); /* we continue on errors from get_disk_space */ fprintf(log, "\n*** non-default options ***\n\n"); lopsub_dump = lls_dump_parse_result(lpr, CMD_PTR(DSS), true); fprintf(log, "%s", lopsub_dump); free(lopsub_dump); fprintf(log, "\n*** non-default options for \"run\" ***\n\n"); lopsub_dump = lls_dump_parse_result(lpr, CMD_PTR(RUN), true); fprintf(log, "%s", lopsub_dump); free(lopsub_dump); fprintf(log, "\n*** internal state ***\n\n"); fprintf(log, "pid: %d\n" "logfile: %s\n" "snapshot_currently_being_removed: %s\n" "path_to_last_complete_snapshot: %s\n" "reference_snapshot: %s\n" "snapshot_creation_status: %s\n" "snapshot_removal_status: %s\n" "num_consecutive_rsync_errors: %d\n" , (int) getpid(), logfile? OPT_STRING_VAL(RUN, LOGFILE) : "stderr", snapshot_currently_being_removed? snapshot_currently_being_removed->name : "(none)", path_to_last_complete_snapshot? path_to_last_complete_snapshot : "(none)", name_of_reference_snapshot? name_of_reference_snapshot : "(none)", hook_status_description[snapshot_creation_status], hook_status_description[snapshot_removal_status], num_consecutive_rsync_errors ); if (create_pid != 0) fprintf(log, "create_pid: %" PRId32 "\n" "create process is %sstopped\n" , create_pid, create_process_stopped? "" : "not " ); if (remove_pid != 0) fprintf(log, "remove_pid: %" PRId32 "\n", remove_pid); if (next_snapshot_time != 0) fprintf(log, "next snapshot due in %" PRId64 " seconds\n", next_snapshot_time - now); if (current_snapshot_creation_time != 0) fprintf(log, "current_snapshot_creation_time: %" PRId64 " (%" PRId64 " seconds ago)\n", current_snapshot_creation_time, now - current_snapshot_creation_time ); if (next_removal_check.tv_sec != 0) { fprintf(log, "next removal check: %llu (%llu seconds ago)\n", (long long unsigned)next_removal_check.tv_sec, now - (long long unsigned)next_removal_check.tv_sec ); } fprintf(log, "%s %s\n", dash, msg, dash); } /* All DSS_XXX_LOG() macros use this function. */ __printf_2_3 void dss_log(int ll, const char* fmt,...) { va_list argp; FILE *outfd; struct tm *tm; time_t t1; char str[255] = ""; int lpr_ll = lpr? OPT_UINT32_VAL(DSS, LOGLEVEL) : WARNING; if (ll < lpr_ll) return; outfd = logfile? logfile : stderr; if (subcmd == CMD_PTR(RUN)) { time(&t1); tm = localtime(&t1); strftime(str, sizeof(str), "%b %d %H:%M:%S", tm); fprintf(outfd, "%s ", str); if (lpr_ll <= INFO) fprintf(outfd, "%i: ", ll); } va_start(argp, fmt); vfprintf(outfd, fmt, argp); va_end(argp); } /* Print a message either to stdout or to the log file. */ static __printf_1_2 void dss_msg(const char* fmt,...) { FILE *outfd = logfile? logfile : stdout; va_list argp; va_start(argp, fmt); vfprintf(outfd, fmt, argp); va_end(argp); } static void set_config_file_name(void) { if (OPT_GIVEN(DSS, CONFIG_FILE)) { const char *arg = OPT_STRING_VAL(DSS, CONFIG_FILE); config_file = realpath(arg, NULL); if (!config_file) { DSS_EMERG_LOG("could not resolve path %s: %s\n", arg, strerror(errno)); exit(EXIT_FAILURE); } } else { char *home = get_homedir(); char *arg = make_message("%s/.dssrc", home); free(home); config_file = realpath(arg, NULL); if (config_file) free(arg); else /* not fatal */ config_file = arg; } DSS_DEBUG_LOG("config file: %s\n", config_file); ipc_key = super_fast_hash((uint8_t *)config_file, strlen(config_file), 0) >> 1; } static int send_signal(int sig, bool wait) { pid_t pid; int ret = get_dss_pid(ipc_key, &pid); unsigned ms = 32; struct timespec ts; if (ret < 0) return ret; if (OPT_GIVEN(DSS, DRY_RUN)) { dss_msg("%d\n", (int)pid); return 0; } DSS_NOTICE_LOG("sending signal %d to pid %d\n", sig, (int)pid); ret = kill(pid, sig); if (ret < 0) return -ERRNO_TO_DSS_ERROR(errno); if (!wait) return 1; while (ms < 5000) { ts.tv_sec = ms / 1000; ts.tv_nsec = (ms % 1000) * 1000 * 1000; ret = nanosleep(&ts, NULL); if (ret < 0) return -ERRNO_TO_DSS_ERROR(errno); ret = kill(pid, 0); if (ret < 0) { if (errno != ESRCH) return -ERRNO_TO_DSS_ERROR(errno); return 1; } ms *= 2; } return -E_KILL_TIMEOUT; } struct signal_info { const char * const name; int num; }; /* * The table below was taken 2016 from proc/sig.c of procps-3.2.8. Copyright * 1998-2003 by Albert Cahalan, GPLv2. */ static const struct signal_info signal_table[] = { {"ABRT", SIGABRT}, /* IOT */ {"ALRM", SIGALRM}, {"BUS", SIGBUS}, {"CHLD", SIGCHLD}, /* CLD */ {"CONT", SIGCONT}, {"FPE", SIGFPE}, {"HUP", SIGHUP}, {"ILL", SIGILL}, {"INT", SIGINT}, {"KILL", SIGKILL}, {"PIPE", SIGPIPE}, #ifdef SIGPOLL {"POLL", SIGPOLL}, /* IO */ #endif {"PROF", SIGPROF}, #ifdef SIGPWR {"PWR", SIGPWR}, #endif {"QUIT", SIGQUIT}, {"SEGV", SIGSEGV}, #ifdef SIGSTKFLT {"STKFLT", SIGSTKFLT}, #endif {"STOP", SIGSTOP}, {"SYS", SIGSYS}, /* UNUSED */ {"TERM", SIGTERM}, {"TRAP", SIGTRAP}, {"TSTP", SIGTSTP}, {"TTIN", SIGTTIN}, {"TTOU", SIGTTOU}, {"URG", SIGURG}, {"USR1", SIGUSR1}, {"USR2", SIGUSR2}, {"VTALRM", SIGVTALRM}, {"WINCH", SIGWINCH}, {"XCPU", SIGXCPU}, {"XFSZ", SIGXFSZ} }; #define SIGNAL_TABLE_SIZE (sizeof(signal_table) / sizeof(signal_table[0])) #ifndef SIGRTMAX #define SIGRTMAX 64 #endif static int com_kill(void) { bool w_given = OPT_GIVEN(KILL, WAIT); const char *arg = OPT_STRING_VAL(KILL, SIGNAL); int ret, i; if (*arg >= '0' && *arg <= '9') { int64_t val; ret = dss_atoi64(arg, &val); if (ret < 0) return ret; if (val < 0 || val > SIGRTMAX) return -ERRNO_TO_DSS_ERROR(EINVAL); return send_signal(val, w_given); } if (strncasecmp(arg, "sig", 3) == 0) arg += 3; if (strcasecmp(arg, "CLD") == 0) return send_signal(SIGCHLD, w_given); if (strcasecmp(arg, "IOT") == 0) return send_signal(SIGABRT, w_given); for (i = 0; i < SIGNAL_TABLE_SIZE; i++) if (strcasecmp(arg, signal_table[i].name) == 0) return send_signal(signal_table[i].num, w_given); DSS_ERROR_LOG("invalid sigspec: %s\n", arg); return -ERRNO_TO_DSS_ERROR(EINVAL); } EXPORT_CMD_HANDLER(kill); static void dss_get_snapshot_list(struct snapshot_list *sl) { get_snapshot_list(sl, OPT_UINT32_VAL(DSS, UNIT_INTERVAL), OPT_UINT32_VAL(DSS, NUM_INTERVALS)); } static int64_t compute_next_snapshot_time(void) { int64_t x = 0, now = get_current_time(), unit_interval = 24 * 3600 * OPT_UINT32_VAL(DSS, UNIT_INTERVAL), ret, last_completion_time; unsigned wanted = desired_number_of_snapshots(0, OPT_UINT32_VAL(DSS, NUM_INTERVALS)), num_complete = 0; int i; struct snapshot *s = NULL; struct snapshot_list sl; dss_get_snapshot_list(&sl); FOR_EACH_SNAPSHOT(s, i, &sl) { if (!(s->flags & SS_COMPLETE)) continue; num_complete++; x += s->completion_time - s->creation_time; last_completion_time = s->completion_time; } assert(x >= 0); ret = now; if (num_complete == 0) goto out; x /= num_complete; /* avg time to create one snapshot */ if (unit_interval < x * wanted) /* oops, no sleep at all */ goto out; ret = last_completion_time + unit_interval / wanted - x; out: free_snapshot_list(&sl); return ret; } static inline void invalidate_next_snapshot_time(void) { next_snapshot_time = 0; } static inline int next_snapshot_time_is_valid(void) { return next_snapshot_time != 0; } static int next_snapshot_is_due(void) { int64_t now = get_current_time(); if (!next_snapshot_time_is_valid()) next_snapshot_time = compute_next_snapshot_time(); if (next_snapshot_time <= now) { DSS_DEBUG_LOG("next snapshot: now\n"); return 1; } DSS_DEBUG_LOG("next snapshot due in %" PRId64 " seconds\n", next_snapshot_time - now); return 0; } static void pre_create_hook(void) { assert(snapshot_creation_status == HS_READY); /* make sure that the next snapshot time will be recomputed */ invalidate_next_snapshot_time(); DSS_DEBUG_LOG("executing %s\n", OPT_STRING_VAL(DSS, PRE_CREATE_HOOK)); dss_exec_cmdline_pid(&create_pid, OPT_STRING_VAL(DSS, PRE_CREATE_HOOK)); snapshot_creation_status = HS_PRE_RUNNING; } static void pre_remove_hook(struct snapshot *s, const char *why) { char *cmd; if (!s) return; DSS_DEBUG_LOG("%s snapshot %s\n", why, s->name); assert(snapshot_removal_status == HS_READY); assert(remove_pid == 0); assert(!snapshot_currently_being_removed); snapshot_currently_being_removed = dss_malloc(sizeof(struct snapshot)); *snapshot_currently_being_removed = *s; snapshot_currently_being_removed->name = dss_strdup(s->name); cmd = make_message("%s %s/%s", OPT_STRING_VAL(DSS, PRE_REMOVE_HOOK), OPT_STRING_VAL(DSS, DEST_DIR), s->name); DSS_DEBUG_LOG("executing %s\n", cmd); dss_exec_cmdline_pid(&remove_pid, cmd); free(cmd); snapshot_removal_status = HS_PRE_RUNNING; } static int exec_rm(void) { struct snapshot *s = snapshot_currently_being_removed; char *new_name = being_deleted_name(s); char *argv[4]; int ret; argv[0] = "rm"; argv[1] = "-rf"; argv[2] = new_name; argv[3] = NULL; assert(snapshot_removal_status == HS_PRE_SUCCESS); assert(remove_pid == 0); DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval); ret = dss_rename(s->name, new_name); if (ret < 0) goto out; dss_exec(&remove_pid, argv[0], argv); snapshot_removal_status = HS_RUNNING; out: free(new_name); return ret; } static int snapshot_is_being_created(struct snapshot *s) { return s->creation_time == current_snapshot_creation_time; } static struct snapshot *find_orphaned_snapshot(struct snapshot_list *sl) { struct snapshot *s; int i; DSS_DEBUG_LOG("looking for old incomplete snapshots\n"); FOR_EACH_SNAPSHOT(s, i, sl) { if (snapshot_is_being_created(s)) continue; /* * We know that no rm is currently running, so if s is marked * as being deleted, a previously started rm must have failed. */ if (s->flags & SS_BEING_DELETED) return s; if (s->flags & SS_COMPLETE) /* good snapshot */ continue; /* * This snapshot is incomplete and it is not the snapshot * currently being created. However, we must not remove it if * rsync is about to be restarted. As only the newest snapshot * can be restarted, this snapshot is orphaned if it is not the * newest snapshot or if we are not about to restart rsync. */ if (get_newest_snapshot(sl) != s) return s; if (snapshot_creation_status != HS_NEEDS_RESTART) return s; } /* no orphaned snapshots */ return NULL; } static int is_reference_snapshot(struct snapshot *s) { if (!name_of_reference_snapshot) return 0; return strcmp(s->name, name_of_reference_snapshot)? 0 : 1; } static struct snapshot *find_redundant_snapshot(struct snapshot_list *sl) { int i, interval; struct snapshot *s; unsigned missing = 0; uint32_t N = OPT_UINT32_VAL(DSS, NUM_INTERVALS); DSS_DEBUG_LOG("looking for intervals containing too many snapshots\n"); for (interval = N - 1; interval >= 0; interval--) { unsigned keep = desired_number_of_snapshots(interval, N); unsigned num = sl->interval_count[interval]; struct snapshot *victim = NULL, *prev = NULL; int64_t score = LONG_MAX; if (keep >= num) missing += keep - num; if (keep + missing >= num) continue; /* redundant snapshot in this interval, pick snapshot with lowest score */ FOR_EACH_SNAPSHOT(s, i, sl) { int64_t this_score; if (snapshot_is_being_created(s)) continue; if (is_reference_snapshot(s)) continue; if (s->interval > interval) { prev = s; continue; } if (s->interval < interval) break; if (!victim) { victim = s; prev = s; continue; } assert(prev); /* check if s is a better victim */ this_score = s->creation_time - prev->creation_time; assert(this_score >= 0); if (this_score < score) { score = this_score; victim = s; } prev = s; } assert(victim); return victim; } return NULL; } static struct snapshot *find_outdated_snapshot(struct snapshot_list *sl) { int i; struct snapshot *s; DSS_DEBUG_LOG("looking for snapshots belonging to intervals >= %d\n", OPT_UINT32_VAL(DSS, NUM_INTERVALS)); FOR_EACH_SNAPSHOT(s, i, sl) { if (snapshot_is_being_created(s)) continue; if (is_reference_snapshot(s)) continue; if (s->interval < OPT_UINT32_VAL(DSS, NUM_INTERVALS)) continue; return s; } return NULL; } static struct snapshot *find_oldest_removable_snapshot(struct snapshot_list *sl) { int i, num_complete; struct snapshot *s, *ref = NULL; DSS_DEBUG_LOG("picking snapshot with earliest creation time\n"); num_complete = num_complete_snapshots(sl); if (num_complete <= OPT_UINT32_VAL(DSS, MIN_COMPLETE)) return NULL; FOR_EACH_SNAPSHOT(s, i, sl) { if (snapshot_is_being_created(s)) continue; if (is_reference_snapshot(s)) { /* avoid this one */ ref = s; continue; } return s; } assert(ref); DSS_WARNING_LOG("removing reference snapshot %s\n", ref->name); return ref; } /* returns NULL <==> *reason is set to NULL */ static struct snapshot *find_removable_snapshot(struct snapshot_list *sl, bool try_hard, char **reason) { struct snapshot *victim; /* * Don't remove anything if there is free space and we have fewer * snapshots than configured, plus one. This way there is always one * snapshot that can be recycled. */ if (!try_hard && sl->num_snapshots <= 1 << OPT_UINT32_VAL(DSS, NUM_INTERVALS)) goto nope; victim = find_orphaned_snapshot(sl); if (victim) { *reason = make_message("orphaned"); return victim; } victim = find_outdated_snapshot(sl); if (victim) { *reason = make_message("outdated"); return victim; } if (!OPT_GIVEN(DSS, KEEP_REDUNDANT)) { victim = find_redundant_snapshot(sl); if (victim) { *reason = make_message("redundant"); return victim; } } if (!try_hard) goto nope; DSS_WARNING_LOG("nothing obvious to remove\n"); victim = find_oldest_removable_snapshot(sl); if (victim) { *reason = make_message("oldest"); return victim; } nope: *reason = NULL; return NULL; } static int rename_incomplete_snapshot(int64_t start) { char *old_name; int ret; int64_t now; /* * We don't want the dss_rename() below to fail with EEXIST because the * last complete snapshot was created (and completed) in the same * second as this one. */ while ((now = get_current_time()) == start) sleep(1); free(path_to_last_complete_snapshot); ret = complete_name(start, now, &path_to_last_complete_snapshot); if (ret < 0) return ret; old_name = incomplete_name(start); ret = dss_rename(old_name, path_to_last_complete_snapshot); if (ret >= 0) DSS_NOTICE_LOG("%s -> %s\n", old_name, path_to_last_complete_snapshot); free(old_name); return ret; } static int try_to_free_disk_space(void) { int ret; struct snapshot_list sl; struct snapshot *victim; struct timeval now; char *why; int low_disk_space; ret = disk_space_low(NULL); if (ret < 0) return ret; low_disk_space = ret; gettimeofday(&now, NULL); if (tv_diff(&next_removal_check, &now, NULL) > 0) return 0; if (!low_disk_space) { if (snapshot_creation_status != HS_READY) return 0; if (next_snapshot_is_due()) return 0; } /* Idle or low disk space, look at existing snapshots. */ dss_get_snapshot_list(&sl); victim = find_removable_snapshot(&sl, low_disk_space, &why); if (victim) { pre_remove_hook(victim, why); free(why); } free_snapshot_list(&sl); if (victim) return 1; if (!low_disk_space) return 0; DSS_CRIT_LOG("uhuhu: disk space low and nothing to remove\n"); return -ERRNO_TO_DSS_ERROR(ENOSPC); } static void post_create_hook(void) { char *cmd = make_message("%s %s/%s", OPT_STRING_VAL(DSS, POST_CREATE_HOOK), OPT_STRING_VAL(DSS, DEST_DIR), path_to_last_complete_snapshot); DSS_NOTICE_LOG("executing %s\n", cmd); dss_exec_cmdline_pid(&create_pid, cmd); free(cmd); snapshot_creation_status = HS_POST_RUNNING; } static void post_remove_hook(void) { char *cmd; struct snapshot *s = snapshot_currently_being_removed; assert(s); cmd = make_message("%s %s/%s", OPT_STRING_VAL(DSS, POST_REMOVE_HOOK), OPT_STRING_VAL(DSS, DEST_DIR), s->name); DSS_NOTICE_LOG("executing %s\n", cmd); dss_exec_cmdline_pid(&remove_pid, cmd); free(cmd); snapshot_removal_status = HS_POST_RUNNING; } static void dss_kill(pid_t pid, int sig, const char *msg) { const char *signame, *process_name; if (pid == 0) return; switch (sig) { case SIGTERM: signame = "TERM"; break; case SIGSTOP: signame = "STOP"; break; case SIGCONT: signame = "CONT"; break; default: signame = "????"; } if (pid == create_pid) process_name = "create"; else if (pid == remove_pid) process_name = "remove"; else process_name = "??????"; if (msg) DSS_INFO_LOG("%s\n", msg); DSS_DEBUG_LOG("sending signal %d (%s) to pid %d (%s process)\n", sig, signame, (int)pid, process_name); if (kill(pid, sig) >= 0) return; DSS_INFO_LOG("failed to send signal %d (%s) to pid %d (%s process)\n", sig, signame, (int)pid, process_name); } static void stop_create_process(void) { if (create_process_stopped) return; dss_kill(create_pid, SIGSTOP, "suspending create process"); create_process_stopped = 1; } static void restart_create_process(void) { if (!create_process_stopped) return; dss_kill(create_pid, SIGCONT, "resuming create process"); create_process_stopped = 0; } static void log_termination_msg(pid_t pid, int status) { if (WIFEXITED(status)) DSS_INFO_LOG("child %i exited. Exit status: %i\n", (int)pid, WEXITSTATUS(status)); else if (WIFSIGNALED(status)) DSS_NOTICE_LOG("child %i was killed by signal %i\n", (int)pid, WTERMSIG(status)); else DSS_WARNING_LOG("child %i terminated abormally\n", (int)pid); } static int wait_for_process(pid_t pid, int *status) { int ret; DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid); for (;;) { fd_set rfds; FD_ZERO(&rfds); FD_SET(signal_pipe, &rfds); ret = dss_select(signal_pipe + 1, &rfds, NULL, NULL); if (ret < 0) break; ret = next_signal(); if (!ret) continue; if (ret == SIGCHLD) { ret = waitpid(pid, status, 0); if (ret >= 0) break; if (errno != EINTR) { /* error */ ret = -ERRNO_TO_DSS_ERROR(errno); break; } } /* SIGINT or SIGTERM */ dss_kill(pid, SIGTERM, "killing child process"); } if (ret < 0) DSS_ERROR_LOG("failed to wait for process %d\n", (int)pid); else log_termination_msg(pid, *status); return ret; } static void handle_pre_remove_exit(int status) { if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { snapshot_removal_status = HS_READY; gettimeofday(&next_removal_check, NULL); next_removal_check.tv_sec += 60; return; } snapshot_removal_status = HS_PRE_SUCCESS; } static int handle_rm_exit(int status) { if (!WIFEXITED(status)) { snapshot_removal_status = HS_READY; return -E_INVOLUNTARY_EXIT; } if (WEXITSTATUS(status)) { snapshot_removal_status = HS_READY; return -E_BAD_EXIT_CODE; } snapshot_removal_status = HS_SUCCESS; return 1; } static void handle_post_remove_exit(void) { snapshot_removal_status = HS_READY; } static int handle_remove_exit(int status) { int ret; struct snapshot *s = snapshot_currently_being_removed; assert(s); switch (snapshot_removal_status) { case HS_PRE_RUNNING: handle_pre_remove_exit(status); ret = 1; break; case HS_RUNNING: ret = handle_rm_exit(status); break; case HS_POST_RUNNING: handle_post_remove_exit(); ret = 1; break; default: ret = -E_BUG; } if (snapshot_removal_status == HS_READY) { free(s->name); free(s); snapshot_currently_being_removed = NULL; } remove_pid = 0; return ret; } static int wait_for_remove_process(void) { int status, ret; assert(remove_pid); assert( snapshot_removal_status == HS_PRE_RUNNING || snapshot_removal_status == HS_RUNNING || snapshot_removal_status == HS_POST_RUNNING ); ret = wait_for_process(remove_pid, &status); if (ret < 0) return ret; return handle_remove_exit(status); } static int handle_rsync_exit(int status) { int es, ret; if (!WIFEXITED(status)) { DSS_ERROR_LOG("rsync process %d died involuntary\n", (int)create_pid); ret = -E_INVOLUNTARY_EXIT; snapshot_creation_status = HS_READY; goto out; } es = WEXITSTATUS(status); /* * Restart rsync on non-fatal errors: * 24: Partial transfer due to vanished source files */ if (es != 0 && es != 24) { DSS_WARNING_LOG("rsync exit code %d, error count %d\n", es, ++num_consecutive_rsync_errors); if (!logfile) { /* called by com_run() */ ret = -E_BAD_EXIT_CODE; goto out; } if (num_consecutive_rsync_errors > OPT_UINT32_VAL(RUN, MAX_RSYNC_ERRORS)) { ret = -E_TOO_MANY_RSYNC_ERRORS; snapshot_creation_status = HS_READY; goto out; } DSS_WARNING_LOG("restarting rsync process\n"); snapshot_creation_status = HS_NEEDS_RESTART; next_snapshot_time = get_current_time() + 60; ret = 1; goto out; } num_consecutive_rsync_errors = 0; ret = rename_incomplete_snapshot(current_snapshot_creation_time); if (ret < 0) goto out; snapshot_creation_status = HS_SUCCESS; free(name_of_reference_snapshot); name_of_reference_snapshot = NULL; out: create_process_stopped = 0; return ret; } static int handle_pre_create_hook_exit(int status) { int es, ret; static int warn_count; if (!WIFEXITED(status)) { snapshot_creation_status = HS_READY; ret = -E_INVOLUNTARY_EXIT; goto out; } es = WEXITSTATUS(status); if (es) { if (!warn_count--) { DSS_NOTICE_LOG("pre_create_hook %s returned %d\n", OPT_STRING_VAL(DSS, PRE_CREATE_HOOK), es); DSS_NOTICE_LOG("deferring snapshot creation...\n"); warn_count = 60; /* warn only once per hour */ } next_snapshot_time = get_current_time() + 60; snapshot_creation_status = HS_READY; ret = 0; goto out; } warn_count = 0; snapshot_creation_status = HS_PRE_SUCCESS; ret = 1; out: return ret; } static int handle_sigchld(void) { pid_t pid; int status, ret = reap_child(&pid, &status); if (ret <= 0) return ret; if (pid == create_pid) { switch (snapshot_creation_status) { case HS_PRE_RUNNING: ret = handle_pre_create_hook_exit(status); break; case HS_RUNNING: ret = handle_rsync_exit(status); break; case HS_POST_RUNNING: snapshot_creation_status = HS_READY; ret = 1; break; default: DSS_EMERG_LOG("BUG: create can't die in status %d\n", snapshot_creation_status); return -E_BUG; } create_pid = 0; return ret; } if (pid == remove_pid) { ret = handle_remove_exit(status); if (ret < 0) return ret; return ret; } DSS_EMERG_LOG("BUG: unknown process %d died\n", (int)pid); return -E_BUG; } /* also checks if . is a mountpoint, if --mountpoint was given */ static int change_to_dest_dir(void) { int ret; const char *dd = OPT_STRING_VAL(DSS, DEST_DIR); struct stat dot, dotdot; DSS_INFO_LOG("changing cwd to %s\n", dd); if (chdir(dd) < 0) { ret = -ERRNO_TO_DSS_ERROR(errno); DSS_ERROR_LOG("could not change cwd to %s\n", dd); return ret; } if (!OPT_GIVEN(DSS, MOUNTPOINT)) return 0; if (stat(".", &dot) < 0) { ret = -ERRNO_TO_DSS_ERROR(errno); DSS_ERROR_LOG("could not stat .\n"); return ret; } if (stat("..", &dotdot) < 0) { ret = -ERRNO_TO_DSS_ERROR(errno); DSS_ERROR_LOG("could not stat ..\n"); return ret; } if (dot.st_dev == dotdot.st_dev && dot.st_ino != dotdot.st_ino) { DSS_ERROR_LOG("mountpoint check failed for %s\n", dd); return -E_MOUNTPOINT; } return 1; } static int check_config(void) { uint32_t unit_interval = OPT_UINT32_VAL(DSS, UNIT_INTERVAL); uint32_t num_intervals = OPT_UINT32_VAL(DSS, NUM_INTERVALS); if (unit_interval == 0) { DSS_ERROR_LOG("bad unit interval: %i\n", unit_interval); return -E_INVALID_NUMBER; } DSS_DEBUG_LOG("unit interval: %i day(s)\n", unit_interval); if (num_intervals == 0 || num_intervals > 30) { DSS_ERROR_LOG("bad number of intervals: %i\n", num_intervals); return -E_INVALID_NUMBER; } if (subcmd == CMD_PTR(RUN) || subcmd == CMD_PTR(CREATE)) if (!OPT_GIVEN(DSS, SOURCE_DIR)) { DSS_ERROR_LOG("--source-dir required\n"); return -E_SYNTAX; } if (subcmd == CMD_PTR(RUN) || subcmd == CMD_PTR(CREATE) || subcmd == CMD_PTR(LS) || subcmd == CMD_PTR(PRUNE)) { if (!OPT_GIVEN(DSS, DEST_DIR)) { DSS_ERROR_LOG("--dest-dir required\n"); return -E_SYNTAX; } } DSS_DEBUG_LOG("number of intervals: %i\n", num_intervals); return 1; } static int lopsub_error(int lopsub_ret, char **errctx) { const char *msg = lls_strerror(-lopsub_ret); if (*errctx) DSS_ERROR_LOG("%s: %s\n", *errctx, msg); else DSS_ERROR_LOG("%s\n", msg); free(*errctx); *errctx = NULL; return -E_LOPSUB; } static int parse_config_file(bool sighup, const struct lls_command *cmd) { int ret, fd = -1; struct stat statbuf; void *map; size_t sz; int cf_argc; char **cf_argv, *errctx = NULL; struct lls_parse_result *cf_lpr, *merged_lpr, *clpr; const char *subcmd_name; ret = open(config_file, O_RDONLY); if (ret < 0) { if (errno != ENOENT || OPT_GIVEN(DSS, CONFIG_FILE)) { ret = -ERRNO_TO_DSS_ERROR(errno); DSS_ERROR_LOG("config file %s can not be opened\n", config_file); goto out; } /* no config file -- nothing to do */ ret = 0; goto success; } fd = ret; ret = fstat(fd, &statbuf); if (ret < 0) { ret = -ERRNO_TO_DSS_ERROR(errno); DSS_ERROR_LOG("failed to stat config file %s\n", config_file); goto close_fd; } sz = statbuf.st_size; if (sz == 0) { /* config file is empty -- nothing to do */ ret = 0; goto success; } map = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, fd, 0); if (map == MAP_FAILED) { ret = -ERRNO_TO_DSS_ERROR(errno); DSS_ERROR_LOG("failed to mmap config file %s\n", config_file); goto close_fd; } if (cmd == CMD_PTR(DSS)) subcmd_name = NULL; else subcmd_name = lls_command_name(cmd); ret = lls_convert_config(map, sz, subcmd_name, &cf_argv, &errctx); munmap(map, sz); if (ret < 0) { DSS_ERROR_LOG("failed to convert config file %s\n", config_file); ret = lopsub_error(ret, &errctx); goto close_fd; } cf_argc = ret; ret = lls_parse(cf_argc, cf_argv, cmd, &cf_lpr, &errctx); lls_free_argv(cf_argv); if (ret < 0) { ret = lopsub_error(ret, &errctx); goto close_fd; } clpr = cmd == CMD_PTR(DSS)? cmdline_lpr : cmdline_sublpr; if (sighup) /* config file overrides command line */ ret = lls_merge(cf_lpr, clpr, cmd, &merged_lpr, &errctx); else /* command line options overrride config file options */ ret = lls_merge(clpr, cf_lpr, cmd, &merged_lpr, &errctx); lls_free_parse_result(cf_lpr, cmd); if (ret < 0) { ret = lopsub_error(ret, &errctx); goto close_fd; } ret = 1; success: assert(ret >= 0); DSS_DEBUG_LOG("loglevel: %d\n", OPT_UINT32_VAL(DSS, LOGLEVEL)); if (cmd != CMD_PTR(DSS)) { if (ret > 0) { if (sublpr != cmdline_sublpr) lls_free_parse_result(sublpr, cmd); sublpr = merged_lpr; } else sublpr = cmdline_sublpr; } else { if (ret > 0) { if (lpr != cmdline_lpr) lls_free_parse_result(lpr, cmd); lpr = merged_lpr; } else lpr = cmdline_lpr; } close_fd: if (fd >= 0) close(fd); out: return ret; } static int handle_sighup(void) { int ret; DSS_NOTICE_LOG("SIGHUP, re-reading config\n"); dump_dss_config("old"); ret = parse_config_file(true /* SIGHUP */, CMD_PTR(DSS)); if (ret < 0) return ret; ret = parse_config_file(true /* SIGHUP */, CMD_PTR(RUN)); if (ret < 0) return ret; ret = check_config(); if (ret < 0) return ret; close_log(logfile); logfile = NULL; if (OPT_GIVEN(RUN, DAEMON) || daemonized) { logfile = open_log(OPT_STRING_VAL(RUN, LOGFILE)); log_welcome(OPT_UINT32_VAL(DSS, LOGLEVEL)); daemonized = true; } dump_dss_config("reloaded"); invalidate_next_snapshot_time(); return 1; } static void kill_children(void) { restart_create_process(); dss_kill(create_pid, SIGTERM, NULL); dss_kill(remove_pid, SIGTERM, NULL); } static int handle_signal(void) { int sig, ret = next_signal(); if (ret <= 0) goto out; sig = ret; switch (sig) { case SIGINT: case SIGTERM: return -E_SIGNAL; case SIGHUP: ret = handle_sighup(); break; case SIGCHLD: ret = handle_sigchld(); break; } out: if (ret < 0) DSS_ERROR_LOG("%s\n", dss_strerror(-ret)); return ret; } /* * We can not use rsync locally if the local user is different from the remote * user or if the src dir is not on the local host (or both). */ static int use_rsync_locally(char *logname) { const char *h = OPT_STRING_VAL(DSS, REMOTE_HOST); if (strcmp(h, "localhost") && strcmp(h, "127.0.0.1")) return 0; if (OPT_GIVEN(DSS, REMOTE_USER) && strcmp(OPT_STRING_VAL(DSS, REMOTE_USER), logname)) return 0; return 1; } static int rename_resume_snap(int64_t creation_time) { struct snapshot_list sl; struct snapshot *s = NULL; char *new_name = incomplete_name(creation_time); int ret; const char *why; sl.num_snapshots = 0; ret = 0; dss_get_snapshot_list(&sl); /* * Snapshot recycling: We first look at the newest snapshot. If this * snapshot happens to be incomplete, the last rsync process was * aborted and we reuse this one. Otherwise we look at snapshots which * could be removed (outdated and redundant snapshots) as candidates * for recycling. If no outdated/redundant snapshot exists, we check if * there is an orphaned snapshot, which likely is useless anyway. * * Only if no existing snapshot is suitable for recycling, we bite the * bullet and create a new one. */ s = get_newest_snapshot(&sl); if (!s) /* no snapshots at all */ goto out; /* re-use last snapshot if it is incomplete */ why = "aborted"; if ((s->flags & SS_COMPLETE) == 0) goto out; why = "outdated"; s = find_outdated_snapshot(&sl); if (s) goto out; why = "redundant"; s = find_redundant_snapshot(&sl); if (s) goto out; why = "orphaned"; s = find_orphaned_snapshot(&sl); out: if (s) { DSS_NOTICE_LOG("recycling %s snapshot %s\n", why, s->name); ret = dss_rename(s->name, new_name); } if (ret >= 0) DSS_NOTICE_LOG("creating %s\n", new_name); free(new_name); free_snapshot_list(&sl); return ret; } static void create_rsync_argv(char ***argv, int64_t *num) { char *logname; int i = 0, j, N; struct snapshot_list sl; static bool seeded; dss_get_snapshot_list(&sl); assert(!name_of_reference_snapshot); name_of_reference_snapshot = name_of_newest_complete_snapshot(&sl); free_snapshot_list(&sl); /* * We specify up to 6 arguments, one argument per given rsync option * and one argument per given source dir. We also need space for the * terminating NULL pointer. */ N = OPT_GIVEN(DSS, RSYNC_OPTION) + OPT_GIVEN(DSS, SOURCE_DIR); *argv = dss_malloc((7 + N) * sizeof(char *)); (*argv)[i++] = dss_strdup("rsync"); (*argv)[i++] = dss_strdup("-a"); (*argv)[i++] = dss_strdup("--delete"); if (!seeded) { srandom((unsigned)time(NULL)); /* no need to be fancy here */ seeded = true; } if (1000 * (random() / (RAND_MAX + 1.0)) < OPT_UINT32_VAL(DSS, CHECKSUM)) { DSS_NOTICE_LOG("adding --checksum to rsync options\n"); (*argv)[i++] = dss_strdup("--checksum"); } for (j = 0; j < OPT_GIVEN(DSS, RSYNC_OPTION); j++) (*argv)[i++] = dss_strdup(lls_string_val(j, OPT_RESULT(DSS, RSYNC_OPTION))); if (name_of_reference_snapshot) { DSS_INFO_LOG("using %s as reference\n", name_of_reference_snapshot); (*argv)[i++] = make_message("--link-dest=../%s", name_of_reference_snapshot); } else DSS_INFO_LOG("no suitable reference snapshot found\n"); logname = dss_logname(); if (use_rsync_locally(logname)) { for (j = 0; j < OPT_GIVEN(DSS, SOURCE_DIR); j++) (*argv)[i++] = dss_strdup(lls_string_val(j, OPT_RESULT(DSS, SOURCE_DIR))); } else { /* * dss-1.0 and earlier did not support multiple source * directories. These versions appended a slash to the end of * the source directory to make sure that only the contents of * the single source directory, but not the directory itself, * are copied to the destination. For multiple source * directories, however, this is not a good idea because the * source directories may well contain identical file names, * which would then be copied to the same location on the * destination, overwriting each other. Moreover, we want the * directory on the destination match the source. To preserve * the old behaviour, we thus have to special-case N=1. */ for (j = 0; j < OPT_GIVEN(DSS, SOURCE_DIR); j++) { (*argv)[i++] = make_message("%s@%s:%s%s", OPT_GIVEN(DSS, REMOTE_USER)? OPT_STRING_VAL(DSS, REMOTE_USER) : logname, OPT_STRING_VAL(DSS, REMOTE_HOST), lls_string_val(j, OPT_RESULT(DSS, SOURCE_DIR)), OPT_GIVEN(DSS, SOURCE_DIR) == 1? "/" : "" ); } } free(logname); *num = get_current_time(); (*argv)[i++] = incomplete_name(*num); (*argv)[i++] = NULL; for (j = 0; j < i; j++) DSS_DEBUG_LOG("argv[%d] = %s\n", j, (*argv)[j]); } static void free_rsync_argv(char **argv) { int i; if (!argv) return; for (i = 0; argv[i]; i++) free(argv[i]); free(argv); } static int create_snapshot(char **argv) { int ret; assert(argv); ret = rename_resume_snap(current_snapshot_creation_time); if (ret < 0) return ret; dss_exec(&create_pid, argv[0], argv); snapshot_creation_status = HS_RUNNING; return ret; } static int select_loop(void) { int ret; /* check every 60 seconds for free disk space */ struct timeval tv; char **rsync_argv = NULL; for (;;) { fd_set rfds; struct timeval *tvp; if (remove_pid) tvp = NULL; /* sleep until rm hook/process dies */ else { /* sleep one minute */ tv.tv_sec = 60; tv.tv_usec = 0; tvp = &tv; } FD_ZERO(&rfds); FD_SET(signal_pipe, &rfds); ret = dss_select(signal_pipe + 1, &rfds, NULL, tvp); if (ret < 0) goto out; if (FD_ISSET(signal_pipe, &rfds)) { ret = handle_signal(); if (ret < 0) goto out; } if (remove_pid) continue; if (snapshot_removal_status == HS_PRE_SUCCESS) { ret = exec_rm(); if (ret < 0) goto out; continue; } if (snapshot_removal_status == HS_SUCCESS) { post_remove_hook(); continue; } ret = try_to_free_disk_space(); if (ret < 0) goto out; if (snapshot_removal_status != HS_READY) { stop_create_process(); continue; } restart_create_process(); switch (snapshot_creation_status) { case HS_READY: if (!next_snapshot_is_due()) continue; pre_create_hook(); continue; case HS_PRE_RUNNING: case HS_RUNNING: case HS_POST_RUNNING: continue; case HS_PRE_SUCCESS: if (!name_of_reference_snapshot) { free_rsync_argv(rsync_argv); create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time); } ret = create_snapshot(rsync_argv); if (ret < 0) goto out; continue; case HS_NEEDS_RESTART: if (!next_snapshot_is_due()) continue; ret = create_snapshot(rsync_argv); if (ret < 0) goto out; continue; case HS_SUCCESS: post_create_hook(); continue; } } out: return ret; } static void exit_hook(int exit_code) { pid_t pid; char **argv, *tmp = dss_strdup(OPT_STRING_VAL(DSS, EXIT_HOOK)); unsigned n = split_args(tmp, &argv); n++; argv = dss_realloc(argv, (n + 1) * sizeof(char *)); argv[n - 1] = dss_strdup(dss_strerror(-exit_code)); argv[n] = NULL; dss_exec(&pid, argv[0], argv); free(argv[n - 1]); free(argv); free(tmp); } static void lock_dss_or_die(void) { int ret = lock_dss(ipc_key); if (ret < 0) { DSS_EMERG_LOG("failed to lock: %s\n", dss_strerror(-ret)); exit(EXIT_FAILURE); } } static int com_run(void) { int ret, fd = -1; pid_t pid; if (OPT_GIVEN(DSS, DRY_RUN)) { DSS_ERROR_LOG("dry run not supported by this command\n"); return -E_SYNTAX; } ret = get_dss_pid(ipc_key, &pid); if (ret >= 0) { DSS_ERROR_LOG("pid %d\n", (int)pid); return -E_ALREADY_RUNNING; } /* * Order is important here: Since daemon_init() forks, it would drop * the lock if it had been acquired already. Changing the cwd before * grabbing the lock causes stat(2) to fail in case a relative config * file path was given, which results in a different key ID for * locking. Therefore we must first daemonize, then lock, then change * the cwd. */ if (OPT_GIVEN(RUN, DAEMON)) { fd = daemon_init(); daemonized = true; logfile = open_log(OPT_STRING_VAL(RUN, LOGFILE)); } lock_dss_or_die(); ret = change_to_dest_dir(); if (ret < 0) return ret; dump_dss_config("startup"); ret = install_sighandler(SIGHUP); if (ret < 0) return ret; if (fd >= 0) { ret = write(fd, "\0", 1); if (ret != 1) { DSS_ERROR_LOG("write to daemon pipe returned %d\n", ret); if (ret < 0) return -ERRNO_TO_DSS_ERROR(errno); return -E_BUG; } } ret = select_loop(); if (ret >= 0) /* impossible */ ret = -E_BUG; kill_children(); exit_hook(ret); while (wait(NULL) >= 0 || errno != ECHILD) ; /* still have children to wait for */ return ret; } EXPORT_CMD_HANDLER(run); static int com_prune(void) { int ret; struct snapshot_list sl; struct snapshot *victim; struct disk_space ds; char *why; bool try_hard; lock_dss_or_die(); ret = change_to_dest_dir(); if (ret < 0) return ret; switch (OPT_UINT32_VAL(PRUNE, DISK_SPACE)) { case FDS_LOW: try_hard = true; break; case FDS_HIGH: try_hard = false; break; default: ret = get_disk_space(".", &ds); if (ret < 0) return ret; log_disk_space(&ds); try_hard = disk_space_low(&ds); } dss_get_snapshot_list(&sl); victim = find_removable_snapshot(&sl, try_hard, &why); if (!victim) { dss_msg("nothing to prune\n"); ret = 0; goto free_sl; } if (OPT_GIVEN(DSS, DRY_RUN)) { dss_msg("picking %s snapshot %s (interval = %i)\n", why, victim->name, victim->interval); ret = 0; goto free_why; } pre_remove_hook(victim, why); if (snapshot_removal_status == HS_PRE_RUNNING) { ret = wait_for_remove_process(); if (ret < 0) goto free_why; ret = -E_HOOK_FAILED; if (snapshot_removal_status != HS_PRE_SUCCESS) goto free_why; } ret = exec_rm(); if (ret < 0) goto free_why; ret = wait_for_remove_process(); if (ret < 0) goto free_why; assert(snapshot_removal_status == HS_SUCCESS); post_remove_hook(); assert(snapshot_removal_status == HS_POST_RUNNING); ret = wait_for_remove_process(); free_why: free(why); free_sl: free_snapshot_list(&sl); return ret; } EXPORT_CMD_HANDLER(prune); static int com_create(void) { int ret, status; char **rsync_argv; lock_dss_or_die(); ret = change_to_dest_dir(); if (ret < 0) return ret; if (OPT_GIVEN(DSS, DRY_RUN)) { int i; char *msg = NULL; create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time); for (i = 0; rsync_argv[i]; i++) { char *tmp = msg; msg = make_message("%s%s%s", tmp? tmp : "", tmp? " " : "", rsync_argv[i]); free(tmp); } free_rsync_argv(rsync_argv); dss_msg("%s\n", msg); free(msg); return 1; } pre_create_hook(); if (create_pid) { ret = wait_for_process(create_pid, &status); if (ret < 0) return ret; ret = handle_pre_create_hook_exit(status); if (ret <= 0) /* error, or pre-create failed */ return ret; } create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time); ret = create_snapshot(rsync_argv); if (ret < 0) goto out; ret = wait_for_process(create_pid, &status); if (ret < 0) goto out; ret = handle_rsync_exit(status); if (ret < 0) goto out; post_create_hook(); if (create_pid) ret = wait_for_process(create_pid, &status); out: free_rsync_argv(rsync_argv); return ret; } EXPORT_CMD_HANDLER(create); static int com_ls(void) { int i, ret; struct snapshot_list sl; struct snapshot *s; int64_t now = get_current_time(); ret = change_to_dest_dir(); if (ret < 0) return ret; dss_get_snapshot_list(&sl); FOR_EACH_SNAPSHOT(s, i, &sl) { int64_t d; if (s->flags & SS_COMPLETE) d = (s->completion_time - s->creation_time) / 60; else d = (now - s->creation_time) / 60; dss_msg("%u\t%s\t%3" PRId64 ":%02" PRId64 "\n", s->interval, s->name, d / 60, d % 60); } free_snapshot_list(&sl); return 1; } EXPORT_CMD_HANDLER(ls); static int com_configtest(void) { printf("Syntax Ok\n"); return 0; } EXPORT_CMD_HANDLER(configtest); static int setup_signal_handling(void) { int ret; DSS_INFO_LOG("setting up signal handlers\n"); signal_pipe = signal_init(); /* always successful */ ret = install_sighandler(SIGINT); if (ret < 0) return ret; ret = install_sighandler(SIGTERM); if (ret < 0) return ret; return install_sighandler(SIGCHLD); } const char *dss_version(void); static void handle_version_and_help(void) { char *txt; if (OPT_GIVEN(DSS, VERSION)) { printf("%s\n", dss_version()); exit(EXIT_SUCCESS); } if (OPT_GIVEN(DSS, DETAILED_HELP)) txt = lls_long_help(CMD_PTR(DSS)); else if (OPT_GIVEN(DSS, HELP)) txt = lls_short_help(CMD_PTR(DSS)); else return; printf("%s", txt); printf("\nRun dss help for help on subcommands.\n"); free(txt); exit(EXIT_SUCCESS); } static void show_subcommand_summary(void) { const struct lls_command *cmd; int i; printf("Available subcommands:\n"); for (i = 1; (cmd = lls_cmd(i, dss_suite)); i++) { const char *name = lls_command_name(cmd); const char *purpose = lls_purpose(cmd); printf("%-11s%s\n", name, purpose); } printf("\nRun dss help for help on .\n"); } static int com_help(void) { int ret; char *errctx, *help; const char *arg; const struct lls_command *cmd; ret = lls_check_arg_count(sublpr, 0, 1, &errctx); if (ret < 0) return lopsub_error(ret, &errctx); if (lls_num_inputs(sublpr) == 0) { show_subcommand_summary(); return 0; } arg = lls_input(0, sublpr); ret = lls_lookup_subcmd(arg, dss_suite, &errctx); if (ret < 0) return lopsub_error(ret, &errctx); cmd = lls_cmd(ret, dss_suite); if (OPT_GIVEN(HELP, LONG)) help = lls_long_help(cmd); else help = lls_short_help(cmd); printf("%s", help); free(help); if (!OPT_GIVEN(HELP, LONG)) printf("\nRun dss -- help -l %s for long help.\n", arg); return 0; } EXPORT_CMD_HANDLER(help); int main(int argc, char **argv) { int ret; char *errctx = NULL; unsigned num_inputs; const struct dss_user_data *ud; ret = lls_parse(argc, argv, CMD_PTR(DSS), &cmdline_lpr, &errctx); if (ret < 0) { ret = lopsub_error(ret, &errctx); goto out; } lpr = cmdline_lpr; set_config_file_name(); ret = parse_config_file(false /* no SIGHUP */, CMD_PTR(DSS)); if (ret < 0) goto out; handle_version_and_help(); num_inputs = lls_num_inputs(lpr); if (num_inputs == 0) { show_subcommand_summary(); ret = 0; goto out; } ret = lls_lookup_subcmd(argv[argc - num_inputs], dss_suite, &errctx); if (ret < 0) { ret = lopsub_error(ret, &errctx); goto out; } subcmd = lls_cmd(ret, dss_suite); ret = lls_parse(num_inputs, argv + argc - num_inputs, subcmd, &cmdline_sublpr, &errctx); if (ret < 0) { ret = lopsub_error(ret, &errctx); goto out; } sublpr = cmdline_sublpr; ret = parse_config_file(false /* no SIGHUP */, subcmd); if (ret < 0) goto out; ret = check_config(); if (ret < 0) goto out; ret = setup_signal_handling(); if (ret < 0) goto out; ud = lls_user_data(subcmd); ret = ud->handler(); signal_shutdown(); out: if (ret < 0) { if (errctx) DSS_ERROR_LOG("%s\n", errctx); DSS_EMERG_LOG("%s\n", dss_strerror(-ret)); } free(errctx); lls_free_parse_result(lpr, CMD_PTR(DSS)); if (lpr != cmdline_lpr) lls_free_parse_result(cmdline_lpr, CMD_PTR(DSS)); lls_free_parse_result(sublpr, subcmd); if (sublpr != cmdline_sublpr) lls_free_parse_result(cmdline_sublpr, subcmd); free(config_file); exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE); }