Refactor tty handling to use service backend enabling conditions etc.

Initial refactor of the tty implementation to use the service/run/task
general backend.  This enables all the features of services also for
ttys, except logging because it makes no sense.

Work in progress:

 - plugins/tty.c does not work anymore, could possibly be removed in
   favor of usinga (a new) condition instead (if-tty-exists)
 - fallback tty does not work anymore, should we remove it, or can we
   handle it as an optional built-in with (a new) condition?
 - @console does not work anymore, needs to generate N cloned services

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

src/svc.c

@@ -114,7 +114,7 @@ svc_t *svc_new(char *cmd, char *id, int type)
 
 	/* Find first job n:o if registering multiple instances */
 	for (svc = svc_iterator(&iter, 1); svc; svc = svc_iterator(&iter, 0)) {
-		if (!strcmp(svc->cmd, cmd)) {
+		if (cmd && !strcmp(svc->cmd, cmd)) {
 			job = svc->job;
 			break;
 		}
@@ -130,13 +130,17 @@ svc_t *svc_new(char *cmd, char *id, int type)
 	svc->job  = job;
 	if (id && id[0])
 		strlcpy(svc->id, id, sizeof(svc->id));
-	strlcpy(svc->cmd, cmd, sizeof(svc->cmd));
+	if (cmd)
+		strlcpy(svc->cmd, cmd, sizeof(svc->cmd));
 
 	/* Default description, if missing */
 	strlcpy(svc->desc, svc->name, sizeof(svc->desc));
 
 	/* Default HALT signal to send */
-	svc->sighalt = SIGTERM;
+	if (svc_is_tty(svc))
+		svc->sighalt = SIGHUP;
+	else
+		svc->sighalt = SIGTERM;
 
 	/* Default delay between SIGTERM and SIGKILL */
 	svc->killdelay = SVC_TERM_TIMEOUT;
@@ -327,7 +331,7 @@ svc_t *svc_stop_completed(void)
 	svc_t *svc, *iter = NULL;
 
 	for (svc = svc_iterator(&iter, 1); svc; svc = svc_iterator(&iter, 0)) {
-		if (svc->state == SVC_STOPPING_STATE)
+		if (svc->state == SVC_STOPPING_STATE && svc->pid > 1)
 			return svc;
 	}
 
@@ -422,6 +426,22 @@ svc_t *svc_find_by_nameid(char *name, char *id)
 	return NULL;
 }
 
+
+svc_t *svc_find_by_tty(char *dev)
+{
+	svc_t *svc, *iter = NULL;
+
+	for (svc = svc_iterator(&iter, 1); svc; svc = svc_iterator(&iter, 0)) {
+		if (!svc_is_tty(svc))
+			continue;
+
+		if (!strcmp(dev, svc->name))
+			return svc;
+	}
+
+	return NULL;
+}
+
 /**
  * svc_find_by_plidfile - Find a service by its PID file
  * @fn: PID file, can be absolute path or relative to /run
@@ -581,6 +601,9 @@ int svc_enabled(svc_t *svc)
 	if (svc_is_missing(svc))
 		return 0;
 
+	if (svc_is_tty(svc) && bootstrap)
+		return 0;
+
 	return 1;
 }