svlogd: fix timestamping; do not warn if config is missing

sv: extend help text

include/usage.h

@@ -3256,8 +3256,18 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
 #define sv_trivial_usage \
        "[-v] [-w sec] command service..."
 #define sv_full_usage \
-       "Report the current status and control the state of services " \
+       "Control services monitored by runsv supervisor.\n" \
-       "monitored by the runsv supervisor"
+       "Commands (only first character is enough):\n" \
+       "\n" \
+       "status: query service status\n" \
+       "up: if service isn't running, start it. If service stops, restart it\n" \
+       "once: like 'up', but if service stops, don't restart it\n" \
+       "down: send TERM and CONT signals. If ./run exits, start ./finish\n" \
+       "    if it exists. After it stops, do not restart service\n" \
+       "exit: send TERM and CONT signals to service and log service. If they exit,\n" \
+       "    runsv exits too\n" \
+       "pause, cont, hup, alarm, interrupt, quit, 1, 2, term, kill: send\n" \
+       "STOP, CONT, HUP, ALRM, INT, QUIT, USR1, USR2, TERM, KILL signal to service"
 
 #define svlogd_trivial_usage \
        "[-ttv] [-r c] [-R abc] [-l len] [-b buflen] dir..."

runit/sv.c

@@ -36,7 +36,7 @@ The sv program reports the current status and controls the state of services
 monitored by the runsv(8) supervisor.
 
 services consists of one or more arguments, each argument naming a directory
-service used by runsv(8). If service doesn?t start with a dot or slash,
+service used by runsv(8). If service doesn't start with a dot or slash,
 it is searched in the default services directory /var/service/, otherwise
 relative to the current directory.
 
@@ -72,6 +72,8 @@ exit
 
 sv actually looks only at the first character of above commands.
 
+Commands compatible to LSB init script actions:
+
 status
     Same as status.
 start
@@ -104,7 +106,7 @@ force-restart
     7 seconds for the service to restart. Then report the status, and
     on timeout send the service the kill command. If the script ./check
     exists in the service directory, sv runs this script to check whether
-    the service is up and available again; it?s considered to be available
+    the service is up and available again; it's considered to be available
     if ./check exits with 0.
 force-shutdown
     Same as exit, but wait up to 7 seconds for the runsv(8) process to

runit/svlogd.c

@@ -465,8 +465,8 @@ static unsigned logdir_open(struct logdir *ld, const char *fn)
 
 	/* read config */
 	i = open_read_close("config", buf, sizeof(buf));
-	if (i < 0)
+	if (i < 0 && errno != ENOENT)
-		warn2("cannot read config", ld->name);
+		bb_perror_msg(WARNING": %s/config", ld->name);
 	if (i > 0) {
 		if (verbose) bb_error_msg(INFO"read: %s/config", ld->name);
 		s = buf;
@@ -835,19 +835,8 @@ int svlogd_main(int argc, char **argv)
 		char ch;
 
 		lineptr = line;
-		taia_now(&now);
+		if (timestamp)
-		/* Prepare timestamp if needed */
-		if (timestamp) {
-			switch (timestamp) {
-			case 1:
-				fmt_taia25(stamp, &now);
-				break;
-			default: /* case 2: */
-				fmt_ptime30nul(stamp, &now);
-				break;
-			}
 			lineptr += 26;
-		}
 
 		/* lineptr[0..linemax-1] - buffer for stdin */
 		/* (possibly has some unprocessed data from prev loop) */
@@ -857,6 +846,7 @@ int svlogd_main(int argc, char **argv)
 		if (!np && !exitasap) {
 			i = linemax - stdin_cnt; /* avail. bytes at tail */
 			if (i >= 128) {
+				taia_now(&now);
 				i = buffer_pread(0, lineptr + stdin_cnt, i, &now);
 				if (i <= 0) /* EOF or error on stdin */
 					exitasap = 1;
@@ -889,6 +879,11 @@ int svlogd_main(int argc, char **argv)
 		printlen = linelen;
 		printptr = lineptr;
 		if (timestamp) {
+			taia_now(&now);
+			if (timestamp == 1)
+				fmt_taia25(stamp, &now);
+			else /* 2: */
+				fmt_ptime30nul(stamp, &now);
 			printlen += 26;
 			printptr -= 26;
 			memcpy(printptr, stamp, 25);