Disable conditions for some non-oneshot (runtime) hooks

The SVC_RECONF, SVC_LOST, SVC_START, and RUNLEVEL_CHANGE hooks are not
one-shot, they are also not regular conditions since there exist no
mechanism to reset them from flux.

One idea was to turn them into actions, but the lost + start hooks need
to be called multiple times per trigger, e.g. `initctl reload`, which
turned out to be non-trivial to implement right now.

Therefore, for (at least) the Finit v3.1 release these conditions have
been disabled ("nop") and ignored by Finit.  Only actual C-style plugins
will be called.

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

src/cond-w.c

@@ -149,6 +149,9 @@ static void cond_update(const char *name)
 void cond_set(const char *name)
 {	
 	_d("%s", name);
+	if (string_compare(name, "nop"))
+		return;
+
 	if (!cond_set_path(cond_path(name), COND_ON))
 		return;
 
@@ -157,9 +160,14 @@ void cond_set(const char *name)
 
 void cond_set_oneshot(const char *name)
 {
-	const char *path = cond_path(name);
+	const char *path;
 
+	if (string_compare(name, "nop"))
+		return;
+
+	path = cond_path(name);
 	_d("s => %s", name, path);
+
 	if (cond_checkpath(path))
 		return;
 
@@ -170,6 +178,9 @@ void cond_set_oneshot(const char *name)
 void cond_clear(const char *name)
 {
 	_d("%s", name);
+	if (string_compare(name, "nop"))
+		return;
+
 	if (!cond_set_path(cond_path(name), COND_OFF))
 		return;
 

src/cond.h

@@ -4,7 +4,6 @@
 #include <paths.h>
 
 #define COND_PATH     _PATH_VARRUN "finit/cond"
-#define COND_SVC_PATH COND_PATH "/svc/"
 #define COND_RECONF   COND_PATH "/reconf"
 
 typedef enum cond_state {

src/plugin.h

@@ -55,6 +55,18 @@
  * Predefined hook points and corresponding conditions in Finit,
  * for use by plugins and scripts.  Recommended to use the task
  * or run stanzas:  task <hook/mount/error> /bin/rescue.sh
+ *
+ * Some of the below hooks cannot (currently) be realized as conditions.
+ * The idea was to rename them action scripts, with optional argument,
+ * according to the following scheme:
+ *
+ * - HOOK_SVC_RECONF      :: action/svc/reconf
+ * - HOOK_SVC_LOST        :: action/svc/lost
+ * - HOOK_SVC_START       :: action/svc/start
+ * - HOOK_RUNLEVEL_CHANGE :: action/sys/runlevel
+ *
+ * However, the implementation did not turn out to be stable enough for
+ * general release, so it was pulled.
  */
 #define HOOK_TYPES {						\
 	/* Bootstrap hooks, runlevel [S] */			\
@@ -67,10 +79,10 @@
 	CHOOSE(HOOK_SYSTEM_UP,       "hook/sys/up"),		\
 								\
 	/* Runtime hooks, runlevel [S1-9] */			\
-	CHOOSE(HOOK_SVC_RECONF,      "hook/svc/reconf"),	\
-	CHOOSE(HOOK_SVC_LOST,        "hook/svc/lost"),		\
-	CHOOSE(HOOK_SVC_START,       "hook/svc/start"),		\
-	CHOOSE(HOOK_RUNLEVEL_CHANGE, "hook/sys/runlevel"),	\
+	CHOOSE(HOOK_SVC_RECONF,      "nop"),			\
+	CHOOSE(HOOK_SVC_LOST,        "nop"),			\
+	CHOOSE(HOOK_SVC_START,       "nop"),			\
+	CHOOSE(HOOK_RUNLEVEL_CHANGE, "nop"),			\
 								\
 	/* Shutdown hooks, runlevel [06] */			\
 	CHOOSE(HOOK_SHUTDOWN,        "hook/sys/shutdown"),	\