struct gengetopt_args_info conf;
char *dss_error_txt = NULL;
static FILE *logfile;
-int signal_pipe;
+static int signal_pipe;
/** Process id of current rsync process. */
static pid_t rsync_pid;
static pid_t rm_pid;
/** When the next snapshot is due. */
struct timeval next_snapshot_time;
+
+pid_t pre_create_hook_pid;
+pid_t post_create_hook_pid;
+
/* Creation time of the snapshot currently being created. */
int64_t current_snapshot_creation_time;
+static char *path_to_last_complete_snapshot;
+
+enum {
+ SCS_READY,
+ SCS_PRE_HOOK_RUNNING,
+ SCS_PRE_HOOK_SUCCESS,
+ SCS_RSYNC_RUNNING,
+ SCS_RSYNC_SUCCESS,
+ SCS_POST_HOOK_RUNNING,
+};
+
+static unsigned snapshot_creation_status;
+
DEFINE_DSS_ERRLIST;
* incomplete, being deleted: 1204565370-incomplete.being_deleted
*/
enum snapshot_status_flags {
+ /** The rsync process terminated successfully. */
SS_COMPLETE = 1,
+ /** The rm process is running to remove this snapshot. */
SS_BEING_DELETED = 2,
};
return 1 << n;
}
+/* return: Whether dirname is a snapshot directory (0: no, 1: yes) */
int is_snapshot(const char *dirname, int64_t now, struct snapshot *s)
{
int i, ret;
compare_snapshots);
}
+void free_snapshot_list(struct snapshot_list *sl)
+{
+ int i;
+ struct snapshot *s;
+
+ FOR_EACH_SNAPSHOT(s, i, sl) {
+ free(s->name);
+ free(s);
+ }
+ free(sl->interval_count);
+ sl->interval_count = NULL;
+ free(sl->snapshots);
+ sl->snapshots = NULL;
+ sl->num_snapshots = 0;
+}
+
void stop_rsync_process(void)
{
if (!rsync_pid || rsync_stopped)
rsync_stopped = 0;
}
-void free_snapshot_list(struct snapshot_list *sl)
-{
- int i;
- struct snapshot *s;
-
- FOR_EACH_SNAPSHOT(s, i, sl) {
- free(s->name);
- free(s);
- }
- free(sl->interval_count);
- free(sl->snapshots);
-}
-
/**
* Print a log message about the exit status of a child.
*/
DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid);
for (;;) {
- pause();
- ret = next_signal();
- if (ret < 0)
+ 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 */
+ if (errno != EINTR) { /* error */
+ ret = -ERRNO_TO_DSS_ERROR(errno);
break;
+ }
}
+ /* SIGINT or SIGTERM */
DSS_WARNING_LOG("sending SIGTERM to pid %d\n", (int)pid);
kill(pid, SIGTERM);
}
- if (ret < 0) {
- ret = -ERRNO_TO_DSS_ERROR(errno);
+ if (ret < 0)
make_err_msg("failed to wait for process %d", (int)pid);
- } else
+ else
log_termination_msg(pid, *status);
return ret;
}
free(new_name);
return ret;
}
+
/*
* return: 0: no redundant snapshots, 1: rm process started, negative: error
*/
if (keep >= num)
missing += keep - num;
- DSS_DEBUG_LOG("interval %i: keep: %u, have: %u, missing: %u\n",
- interval, keep, num, missing);
+// DSS_DEBUG_LOG("interval %i: keep: %u, have: %u, missing: %u\n",
+// interval, keep, num, missing);
if (keep + missing >= num)
continue;
/* redundant snapshot in this interval, pick snapshot with lowest score */
return ret;
}
-
int wait_for_rm_process(void)
{
int status, ret = wait_for_process(rm_pid, &status);
kill(pid, SIGTERM);
}
-void handle_sighup()
+int check_config(void)
+{
+ if (conf.unit_interval_arg <= 0) {
+ make_err_msg("bad unit interval: %i", conf.unit_interval_arg);
+ return -E_INVALID_NUMBER;
+ }
+ DSS_DEBUG_LOG("unit interval: %i day(s)\n", conf.unit_interval_arg);
+ if (conf.num_intervals_arg <= 0) {
+ make_err_msg("bad number of intervals %i", conf.num_intervals_arg);
+ return -E_INVALID_NUMBER;
+ }
+ DSS_DEBUG_LOG("number of intervals: %i\n", conf.num_intervals_arg);
+ return 1;
+}
+
+/* exits on errors */
+void parse_config_file(int override)
+{
+ int ret;
+ char *config_file;
+ struct stat statbuf;
+ char *old_logfile_arg = NULL;
+ int old_daemon_given = 0;
+
+ if (conf.config_file_given)
+ config_file = dss_strdup(conf.config_file_arg);
+ else {
+ char *home = get_homedir();
+ config_file = make_message("%s/.dssrc", home);
+ free(home);
+ }
+ if (override) { /* SIGHUP */
+ if (conf.logfile_given)
+ old_logfile_arg = dss_strdup(conf.logfile_arg);
+ old_daemon_given = conf.daemon_given;
+ }
+
+ ret = stat(config_file, &statbuf);
+ if (ret && conf.config_file_given) {
+ ret = -ERRNO_TO_DSS_ERROR(errno);
+ make_err_msg("failed to stat config file %s", config_file);
+ goto out;
+ }
+ if (!ret) {
+ struct cmdline_parser_params params = {
+ .override = override,
+ .initialize = 0,
+ .check_required = 1,
+ .check_ambiguity = 0
+ };
+ cmdline_parser_config_file(config_file, &conf, ¶ms);
+ }
+ ret = check_config();
+ if (ret < 0)
+ goto out;
+ if (override) {
+ /* don't change daemon mode on SIGHUP */
+ conf.daemon_given = old_daemon_given;
+ close_log(logfile);
+ logfile = NULL;
+ if (conf.logfile_given)
+ free(old_logfile_arg);
+ else if (conf.daemon_given) { /* re-use old logfile */
+ conf.logfile_arg = old_logfile_arg;
+ conf.logfile_given = 1;
+ }
+ }
+ if (conf.logfile_given) {
+ logfile = open_log(conf.logfile_arg);
+ log_welcome(conf.loglevel_arg);
+ }
+ DSS_EMERG_LOG("loglevel: %d\n", conf.loglevel_arg);
+// cmdline_parser_dump(logfile? logfile : stdout, &conf);
+ ret = dss_chdir(conf.dest_dir_arg);
+out:
+ free(config_file);
+ if (ret >= 0)
+ return;
+ log_err_msg(EMERG, -ret);
+ exit(EXIT_FAILURE);
+}
+
+void handle_sighup(void)
{
- DSS_INFO_LOG("FIXME: no sighup handling yet\n");
+ DSS_NOTICE_LOG("SIGHUP\n");
+ parse_config_file(1);
}
int rename_incomplete_snapshot(int64_t start)
{
- char *old_name, *new_name;
+ char *old_name;
int ret;
- ret = complete_name(start, get_current_time(), &new_name);
+ free(path_to_last_complete_snapshot);
+ ret = complete_name(start, get_current_time(),
+ &path_to_last_complete_snapshot);
if (ret < 0)
return ret;
old_name = incomplete_name(start);
- ret = dss_rename(old_name, new_name);
+ ret = dss_rename(old_name, path_to_last_complete_snapshot);
if (ret >= 0)
- DSS_NOTICE_LOG("%s -> %s\n", old_name, new_name);
+ DSS_NOTICE_LOG("%s -> %s\n", old_name,
+ path_to_last_complete_snapshot);
free(old_name);
- free(new_name);
return ret;
}
+void compute_next_snapshot_time(void)
+{
+ struct timeval now, unit_interval = {.tv_sec = 24 * 3600 * conf.unit_interval_arg},
+ tmp, diff;
+ int64_t x = 0;
+ unsigned wanted = num_snapshots(0), num_complete_snapshots = 0;
+ int i, ret;
+ struct snapshot *s = NULL;
+ struct snapshot_list sl;
+
+ assert(snapshot_creation_status == SCS_READY);
+ current_snapshot_creation_time = 0;
+ get_snapshot_list(&sl);
+ FOR_EACH_SNAPSHOT(s, i, &sl) {
+ if (!(s->flags & SS_COMPLETE))
+ continue;
+ num_complete_snapshots++;
+ x += s->completion_time - s->creation_time;
+ }
+ assert(x >= 0);
+ if (num_complete_snapshots)
+ x /= num_complete_snapshots; /* avg time to create one snapshot */
+ x *= wanted; /* time to create all snapshots in interval 0 */
+ tmp.tv_sec = x;
+ tmp.tv_usec = 0;
+ ret = tv_diff(&unit_interval, &tmp, &diff); /* total sleep time per unit interval */
+ gettimeofday(&now, NULL);
+ if (ret < 0 || !s)
+ goto min_sleep;
+ tv_divide(wanted, &diff, &tmp); /* sleep time betweeen two snapshots */
+ diff.tv_sec = s->completion_time;
+ diff.tv_usec = 0;
+ tv_add(&diff, &tmp, &next_snapshot_time);
+ if (tv_diff(&now, &next_snapshot_time, NULL) < 0)
+ goto out;
+min_sleep:
+ next_snapshot_time = now;
+ next_snapshot_time.tv_sec += 60;
+out:
+ free_snapshot_list(&sl);
+}
int handle_rsync_exit(int status)
{
if (!WIFEXITED(status)) {
make_err_msg("rsync process %d died involuntary", (int)rsync_pid);
ret = -E_INVOLUNTARY_EXIT;
+ snapshot_creation_status = SCS_READY;
+ compute_next_snapshot_time();
goto out;
}
es = WEXITSTATUS(status);
if (es != 0 && es != 23 && es != 24) {
make_err_msg("rsync process %d returned %d", (int)rsync_pid, es);
ret = -E_BAD_EXIT_CODE;
+ snapshot_creation_status = SCS_READY;
+ compute_next_snapshot_time();
goto out;
}
ret = rename_incomplete_snapshot(current_snapshot_creation_time);
+ if (ret < 0)
+ goto out;
+ snapshot_creation_status = SCS_RSYNC_SUCCESS;
out:
rsync_pid = 0;
- current_snapshot_creation_time = 0;
rsync_stopped = 0;
return ret;
}
-
int get_newest_complete(const char *dirname, void *private)
{
struct edge_snapshot_data *esd = private;
free(argv);
}
+int pre_create_hook(void)
+{
+ int ret, fds[3] = {0, 0, 0};
+
+ if (!conf.pre_create_hook_given) {
+ snapshot_creation_status = SCS_PRE_HOOK_SUCCESS;
+ return 0;
+ }
+ DSS_NOTICE_LOG("executing %s\n", conf.pre_create_hook_arg);
+ ret = dss_exec_cmdline_pid(&pre_create_hook_pid,
+ conf.pre_create_hook_arg, fds);
+ if (ret < 0)
+ return ret;
+ snapshot_creation_status = SCS_PRE_HOOK_RUNNING;
+ return ret;
+}
+
+int post_create_hook(void)
+{
+ int ret, fds[3] = {0, 0, 0};
+ char *cmd;
+
+ if (!conf.post_create_hook_given) {
+ snapshot_creation_status = SCS_READY;
+ compute_next_snapshot_time();
+ return 0;
+ }
+ cmd = make_message("%s %s", conf.post_create_hook_arg,
+ path_to_last_complete_snapshot);
+ DSS_NOTICE_LOG("executing %s\n", cmd);
+ ret = dss_exec_cmdline_pid(&post_create_hook_pid, cmd, fds);
+ free(cmd);
+ if (ret < 0)
+ return ret;
+ snapshot_creation_status = SCS_POST_HOOK_RUNNING;
+ return ret;
+}
+
int create_snapshot(char **argv)
{
- int fds[3] = {0, 0, 0};
- char *name = incomplete_name(current_snapshot_creation_time);
+ int ret, fds[3] = {0, 0, 0};
+ char *name;
+ name = incomplete_name(current_snapshot_creation_time);
DSS_NOTICE_LOG("creating new snapshot %s\n", name);
free(name);
- return dss_exec(&rsync_pid, argv[0], argv, fds);
+ ret = dss_exec(&rsync_pid, argv[0], argv, fds);
+ if (ret < 0)
+ return ret;
+ snapshot_creation_status = SCS_RSYNC_RUNNING;
+ return ret;
}
-void compute_next_snapshot_time(struct snapshot_list *sl)
+int handle_pre_create_hook_exit(int status)
{
- struct timeval now, unit_interval = {.tv_sec = 24 * 3600 * conf.unit_interval_arg},
- tmp, diff;
- int64_t x = 0;
- unsigned wanted = num_snapshots(0), num_complete_snapshots = 0;
- int i, ret;
- struct snapshot *s;
+ int es, ret;
- gettimeofday(&now, NULL);
- FOR_EACH_SNAPSHOT(s, i, sl) {
- if (!(s->flags & SS_COMPLETE))
- continue;
- num_complete_snapshots++;
- x += s->completion_time - s->creation_time;
+ if (!WIFEXITED(status)) {
+ make_err_msg("pre-create-hook %d died involuntary",
+ (int)pre_create_hook_pid);
+ snapshot_creation_status = SCS_READY;
+ compute_next_snapshot_time();
+ ret = -E_INVOLUNTARY_EXIT;
+ goto out;
}
- assert(x >= 0);
- if (num_complete_snapshots)
- x /= num_complete_snapshots; /* avg time to create one snapshot */
- x *= wanted; /* time to create all snapshots in interval 0 */
- tmp.tv_sec = x;
- tmp.tv_usec = 0;
- ret = tv_diff(&unit_interval, &tmp, &diff); /* time between creation */
- if (ret < 0) {
- next_snapshot_time = now;
- return;
+ es = WEXITSTATUS(status);
+ if (es) {
+ make_err_msg("pre-create-hook %d returned %d",
+ (int)pre_create_hook_pid, es);
+ snapshot_creation_status = SCS_READY;
+ compute_next_snapshot_time();
+ ret = -E_BAD_EXIT_CODE;
+ goto out;
+ }
+ snapshot_creation_status = SCS_PRE_HOOK_SUCCESS;
+ ret = 1;
+out:
+ pre_create_hook_pid = 0;
+ return ret;
+}
+
+int handle_sigchld()
+{
+ pid_t pid;
+ int status, ret = reap_child(&pid, &status);
+
+ if (ret <= 0)
+ return ret;
+ if (pid == rsync_pid)
+ return handle_rsync_exit(status);
+ if (pid == rm_pid)
+ return handle_rm_exit(status);
+ if (pid == pre_create_hook_pid)
+ return handle_pre_create_hook_exit(status);
+ if (pid == post_create_hook_pid) {
+ snapshot_creation_status = SCS_READY;
+ compute_next_snapshot_time();
+ return 1;
}
- tv_divide(wanted, &diff, &tmp);
- tv_add(&now, &tmp, &next_snapshot_time);
+ DSS_EMERG_LOG("BUG: unknown process %d died\n", (int)pid);
+ exit(EXIT_FAILURE);
}
-void handle_signal(struct snapshot_list *sl)
+void handle_signal(void)
{
int sig, ret = next_signal();
goto out;
sig = ret;
switch (sig) {
- int status;
- pid_t pid;
case SIGINT:
case SIGTERM:
restart_rsync_process();
exit(EXIT_FAILURE);
case SIGHUP:
handle_sighup();
+ ret = 1;
break;
case SIGCHLD:
- ret = reap_child(&pid, &status);
- if (ret <= 0)
- break;
- assert(pid == rsync_pid || pid == rm_pid);
- if (pid == rsync_pid)
- ret = handle_rsync_exit(status);
- else
- ret = handle_rm_exit(status);
- free_snapshot_list(sl);
- get_snapshot_list(sl);
- compute_next_snapshot_time(sl);
+ ret = handle_sigchld();
+ break;
}
out:
if (ret < 0)
return 0;
}
-int try_to_free_disk_space(int low_disk_space, struct snapshot_list *sl)
+int try_to_free_disk_space(int low_disk_space)
{
int ret;
+ struct snapshot_list sl;
- ret = remove_outdated_snapshot(sl);
+ get_snapshot_list(&sl);
+ ret = remove_outdated_snapshot(&sl);
if (ret) /* error, or we are removing something */
- return ret;
+ goto out;
/* no outdated snapshot */
- ret = remove_redundant_snapshot(sl);
+ ret = remove_redundant_snapshot(&sl);
if (ret)
- return ret;
+ goto out;
+ ret = 0;
if (!low_disk_space)
- return 0;
+ goto out;
DSS_WARNING_LOG("disk space low and nothing obvious to remove\n");
ret = remove_oldest_snapshot();
if (ret)
- return ret;
+ goto out;
make_err_msg("uhuhu: not enough disk space for a single snapshot");
- return -ENOSPC;
+ ret= -ENOSPC;
+out:
+ free_snapshot_list(&sl);
+ return ret;
}
int select_loop(void)
{
int ret;
struct timeval tv = {.tv_sec = 0, .tv_usec = 0};
- struct snapshot_list sl = {.num_snapshots = 0};
- get_snapshot_list(&sl);
- compute_next_snapshot_time(&sl);
for (;;) {
- struct timeval now, *tvp = &tv;
fd_set rfds;
int low_disk_space;
char **rsync_argv;
+ struct timeval now, *tvp = &tv;
- FD_ZERO(&rfds);
- FD_SET(signal_pipe, &rfds);
if (rsync_pid)
- tv.tv_sec = 60;
+ tv.tv_sec = 60; /* check every 60 seconds for free disk space */
else if (rm_pid)
- tvp = NULL;
+ tvp = NULL; /* sleep until rm process dies */
+ FD_ZERO(&rfds);
+ FD_SET(signal_pipe, &rfds);
+ DSS_DEBUG_LOG("tvp: %p, tv_sec: %lu\n", tvp, (long unsigned) tv.tv_sec);
ret = dss_select(signal_pipe + 1, &rfds, NULL, tvp);
if (ret < 0)
return ret;
if (FD_ISSET(signal_pipe, &rfds))
- handle_signal(&sl);
+ handle_signal();
if (rm_pid)
continue;
ret = disk_space_low();
low_disk_space = ret;
if (low_disk_space)
stop_rsync_process();
- ret = try_to_free_disk_space(low_disk_space, &sl);
+ ret = try_to_free_disk_space(low_disk_space);
if (ret < 0)
break;
if (rm_pid)
continue;
- if (rsync_pid) {
- restart_rsync_process();
- continue;
- }
- /* neither rsync nor rm are running. Start rsync? */
+ restart_rsync_process();
gettimeofday(&now, NULL);
if (tv_diff(&next_snapshot_time, &now, &tv) > 0)
continue;
- create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
- ret = create_snapshot(rsync_argv);
- free_rsync_argv(rsync_argv);
- if (ret < 0)
- break;
+ switch (snapshot_creation_status) {
+ case SCS_READY:
+ ret = pre_create_hook();
+ if (ret < 0)
+ goto out;
+ continue;
+ case SCS_PRE_HOOK_RUNNING:
+ continue;
+ case SCS_PRE_HOOK_SUCCESS:
+ create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
+ ret = create_snapshot(rsync_argv);
+ free_rsync_argv(rsync_argv);
+ if (ret < 0)
+ goto out;
+ continue;
+ case SCS_RSYNC_RUNNING:
+ continue;
+ case SCS_RSYNC_SUCCESS:
+ ret = post_create_hook();
+ if (ret < 0)
+ goto out;
+ continue;
+ case SCS_POST_HOOK_RUNNING:
+ continue;
+ }
}
- free_snapshot_list(&sl);
+out:
return ret;
}
ret = install_sighandler(SIGHUP);
if (ret < 0)
return ret;
+ compute_next_snapshot_time();
return select_loop();
}
int ret, status;
char **rsync_argv;
- create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
if (conf.dry_run_given) {
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;
}
+ ret = pre_create_hook();
+ if (ret < 0)
+ return ret;
+ if (pre_create_hook_pid) {
+ ret = wait_for_process(pre_create_hook_pid, &status);
+ if (ret < 0)
+ return ret;
+ ret = handle_pre_create_hook_exit(status);
+ if (ret < 0)
+ return ret;
+ }
+ create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
ret = create_snapshot(rsync_argv);
if (ret < 0)
goto out;
if (ret < 0)
goto out;
ret = handle_rsync_exit(status);
+ if (ret < 0)
+ goto out;
+ post_create_hook();
+ if (post_create_hook_pid)
+ ret = wait_for_process(post_create_hook_pid, &status);
out:
free_rsync_argv(rsync_argv);
return ret;
return 1;
}
-/* TODO: Unlink pid file */
__noreturn void clean_exit(int status)
{
- //kill(0, SIGTERM);
free(dss_error_txt);
exit(status);
}
-
-int read_config_file(void)
-{
- int ret;
- char *config_file;
- struct stat statbuf;
-
- if (conf.config_file_given)
- config_file = dss_strdup(conf.config_file_arg);
- else {
- char *home = get_homedir();
- config_file = make_message("%s/.dssrc", home);
- free(home);
- }
- ret = stat(config_file, &statbuf);
- if (ret && conf.config_file_given) {
- ret = -ERRNO_TO_DSS_ERROR(errno);
- make_err_msg("failed to stat config file %s", config_file);
- goto out;
- }
- if (!ret) {
- struct cmdline_parser_params params = {
- .override = 0,
- .initialize = 0,
- .check_required = 0,
- .check_ambiguity = 0
- };
- cmdline_parser_config_file(config_file, &conf, ¶ms);
- }
- if (!conf.source_dir_given || !conf.dest_dir_given) {
- ret = -E_SYNTAX;
- make_err_msg("you need to specify both source_dir and dest_dir");
- goto out;
- }
- ret = 1;
-out:
- free(config_file);
- return ret;
-}
-
-int check_config(void)
-{
- if (conf.unit_interval_arg <= 0) {
- make_err_msg("bad unit interval: %i", conf.unit_interval_arg);
- return -E_INVALID_NUMBER;
- }
- DSS_DEBUG_LOG("unit interval: %i day(s)\n", conf.unit_interval_arg);
- if (conf.num_intervals_arg <= 0) {
- make_err_msg("bad number of intervals %i", conf.num_intervals_arg);
- return -E_INVALID_NUMBER;
- }
- DSS_DEBUG_LOG("number of intervals: %i\n", conf.num_intervals_arg);
- return 1;
-}
-
static void setup_signal_handling(void)
{
int ret;
exit(EXIT_FAILURE);
}
-
int main(int argc, char **argv)
{
int ret;
+ struct cmdline_parser_params params = {
+ .override = 0,
+ .initialize = 1,
+ .check_required = 0,
+ .check_ambiguity = 0
+ };
+
+ cmdline_parser_ext(argc, argv, &conf, ¶ms); /* aborts on errors */
+ parse_config_file(0);
- cmdline_parser(argc, argv, &conf); /* aborts on errors */
- ret = read_config_file();
- if (ret < 0)
- goto out;
- ret = check_config();
- if (ret < 0)
- goto out;
- if (conf.logfile_given) {
- logfile = open_log(conf.logfile_arg);
- log_welcome(conf.loglevel_arg);
- }
- ret = dss_chdir(conf.dest_dir_arg);
- if (ret < 0)
- goto out;
if (conf.daemon_given)
daemon_init();
setup_signal_handling();
ret = call_command_handler();
-out:
if (ret < 0)
log_err_msg(EMERG, -ret);
clean_exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
projects / dss.git / blobdiff