shutdown: use cond_clear_noupdate() to prevent nested service_stop()

When the system shuts down, or user changes runlevels, we don't have to
call cond_clear_update(), because this can lead to nested service_stop()
calls, which in turn lead to out of sync progress updates:

[ .. ] Stopping Foo
[ OK ] Stopping Bar
[ OK ]

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/cond-w.c

@@ -35,6 +35,7 @@
 #include "cond.h"
 #include "pid.h"
 #include "service.h"
+#include "sm.h"
 
 struct cond_boot {
 	TAILQ_ENTRY(cond_boot) link;
@@ -214,7 +215,10 @@ static int do_delete(const char *fpath, const struct stat *sb, int tflag, struct
 		err(1, "Failed removing condition %s", fpath);
 
 	cond = ptr + strlen(COND_BASE) + 1;
-	cond_update(cond);
+	if (sm_is_in_teardown(&sm))
+		cond_clear_noupdate(cond);
+	else
+		cond_update(cond);
 
 	return 0;
 }

src/service.c

@@ -2261,7 +2261,7 @@ static void svc_set_state(svc_t *svc, svc_state_t new_state)
 	/* if PID isn't collected within SVC_TERM_TIMEOUT msec, kill it! */
 	if (new_state == SVC_STOPPING_STATE) {
 		dbg("%s is stopping, wait %d sec before sending SIGKILL ...",
-		   svc_ident(svc, NULL, 0), svc->killdelay / 1000);
+		    svc_ident(svc, NULL, 0), svc->killdelay / 1000);
 		service_timeout_cancel(svc);
 		service_timeout_after(svc, svc->killdelay, service_kill);
 	}
@@ -2299,6 +2299,8 @@ static void svc_set_state(svc_t *svc, svc_state_t new_state)
 		if ((old_state == SVC_RUNNING_STATE && new_state == SVC_PAUSED_STATE) ||
 		    (old_state == SVC_PAUSED_STATE  && new_state == SVC_RUNNING_STATE))
 			; 	/* only paused during reload, don't clear conds. */
+		else if (sm_is_in_teardown(&sm))
+			cond_clear_noupdate(cond);
 		else
 			cond_clear(cond);