Add help to rc-update #188170 and tidy up the code a fair bit.

3 files changed, 96 insertions, 50 deletions

diff --git a/ChangeLog b/ChangeLog
index ef4ce867..55f53f6a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@
 
   08 Aug 2007; Roy Marples <uberlord@gentoo.org>:
 
+    Add help to rc-update #188170.
     If given a pidfile, just match on that for seeing if we have crashed
 	or not, #186159.
 
diff --git a/src/librc.c b/src/librc.c
index 9bd89cd9..5b815720 100644
--- a/src/librc.c
+++ b/src/librc.c
@@ -257,9 +257,6 @@ bool rc_service_in_runlevel (const char *service, const char *runlevel)
 	if (! runlevel || ! service)
 		return (false);
 
-	if (! rc_service_exists (service))
-		return (false);
-
 	svc = rc_xstrdup (service);
 	file = rc_strcatpaths (RC_RUNLEVELDIR, runlevel, basename (svc),
 						   (char *) NULL);
diff --git a/src/rc-update.c b/src/rc-update.c
index 96eb06bb..aa996c9d 100644
--- a/src/rc-update.c
+++ b/src/rc-update.c
@@ -5,6 +5,8 @@
    Released under the GPLv2
    */
 
+#define APPLET "rc-update"
+
 #include <errno.h>
 #include <limits.h>
 #include <stdbool.h>
@@ -21,31 +23,76 @@
 
 static char *applet = NULL;
 
+static void usage (void )
+{
+	printf (
+			"usage: %s -a|add script runlevel1 [runlevel2 ...]\n"
+			"       %s -d|del script [runlevel1 ...]\n"
+			"       %s -s|show [-v|--verbose] [runlevel1 ...]\n"
+			"       %s -h|help\n"
+			"\n"
+			"examples:\n"
+			"       # %s add net.eth0 default\n"
+			"       Adds the net.eth0 script (in /etc/init.d) to the `default' runlevel.\n"
+			"\n"
+			"       # %s del sysklogd\n"
+			"       Deletes the sysklogd script from all runlevels.  The original script\n"
+			"       is not deleted, just any symlinks to the script in /etc/runlevels/*.\n"
+			"\n"
+			"       # %s del net.eth2 default wumpus\n"
+			"       Delete the net.eth2 script from the default and wumpus runlevels.\n"
+			"       All other runlevels are unaffected.  Again, the net.eth2 script\n"
+			"       residing in /etc/init.d is not deleted, just any symlinks in\n"
+			"       /etc/runlevels/default and /etc/runlevels/wumpus.\n"
+			"\n"
+			"       # %s show\n"
+			"       Show all enabled scripts and list at which runlevels they will\n"
+			"       execute.  Run with --verbose to see all available scripts.\n",
+		applet, applet, applet, applet, applet, applet, applet, applet);
+}
+
 static bool add (const char *runlevel, const char *service)
 {
-	bool retval = true;
+	bool retval = false;
 
-	if (! rc_runlevel_exists (runlevel)) {
-		ewarn ("runlevel `%s' does not exist", runlevel);
-		return (false);
-	}
-	if (rc_service_in_runlevel (service, runlevel)) {
+	if (! rc_service_exists (service))
+		eerror ("service `%s' does not exist", service);
+	else if (! rc_runlevel_exists (runlevel))
+		eerror ("runlevel `%s' does not exist", runlevel);
+	else if (rc_service_in_runlevel (service, runlevel)) {
 		ewarn ("%s already installed in runlevel `%s'; skipping",
 			   service, runlevel);
-		return (false);
-	}
-
-	if (rc_service_add (runlevel, service))
+		retval = true;
+	} else if (rc_service_add (runlevel, service)) {
 		einfo ("%s added to runlevel %s", service, runlevel);
-	else {
+		retval = true;
+	} else
 		eerror ("%s: failed to add service `%s' to runlevel `%s': %s",
 				applet, service, runlevel, strerror (errno));
-		retval = false;
-	}
 
 	return (retval);
 }
 
+static bool delete (const char *runlevel, const char *service)
+{
+	bool retval = false;
+
+	if (rc_service_in_runlevel (service, runlevel))	{
+		if (rc_service_delete (runlevel, service)) {
+			einfo ("%s removed from runlevel %s", service, runlevel);
+			retval = true;
+		} else
+			eerror ("%s: failed to remove service `%s' from runlevel `%s': %s",
+					applet, service, runlevel, strerror (errno));
+	} else if (! rc_service_exists (service))
+		eerror ("service `%s' does not exist", service);
+	else if (! rc_runlevel_exists (runlevel))
+		eerror ("runlevel `%s' does not exist", runlevel);
+	else
+		retval = true;
+	return (retval);
+}
+
 int rc_update (int argc, char **argv)
 {
 	int i;
@@ -53,6 +100,8 @@ int rc_update (int argc, char **argv)
 	char *service;
 	char **runlevels = NULL;
 	char *runlevel;
+	bool doadd;
+	int retval;
 
 	applet = argv[0];
 	if (argc < 2 ||
@@ -96,8 +145,18 @@ int rc_update (int argc, char **argv)
 			STRLIST_FOREACH (in, runlevel, j)
 				printf (" %s", runlevel);
 			printf ("\n");
+			rc_strlist_free (in);
 		}
 
+		rc_strlist_free (runlevels);
+		rc_strlist_free (services);
+		return (EXIT_SUCCESS);
+	} else if (argc > 1 &&
+			   (strcmp (argv[1], "help") == 0 ||
+				strcmp (argv[1], "--help") == 0 ||
+				strcmp (argv[1], "-h") == 0))
+	{
+		usage ();
 		return (EXIT_SUCCESS);
 	}
 
@@ -110,43 +169,32 @@ int rc_update (int argc, char **argv)
 
 	if (strcmp (argv[1], "add") == 0 ||
 		strcmp (argv[1], "-a") == 0)
-	{
-		if (! service) 
-			eerrorx ("%s: no service specified", applet);
-		if (! rc_service_exists (service))
-			eerrorx ("%s: service `%s' does not exist", applet, service);
-
-		if (argc < 4)
-			add (rc_get_runlevel (), service);
-
-		for (i = 3; i < argc; i++)
-			add (argv[i], service);
-
-		return (EXIT_SUCCESS);
-	}
-
-	if (strcmp (argv[1], "delete") == 0 ||
+		doadd = true;
+	else if (strcmp (argv[1], "delete") == 0 ||
 		strcmp (argv[1], "del") == 0 ||
 		strcmp (argv[1], "-d") == 0)
-	{
-		for (i = 3; i < argc; i++)
-			runlevels = rc_strlist_add (runlevels, argv[i]);
-
-		if (! runlevels)
-			runlevels = rc_strlist_add (runlevels, rc_get_runlevel ()); 
-
-		STRLIST_FOREACH (runlevels, runlevel, i) {
-			if (rc_service_in_runlevel (service, runlevel))	{
-				if (rc_service_delete (runlevel, service))
-					einfo ("%s removed from runlevel %s", service, runlevel);
-				else
-					eerror ("%s: failed to remove service `%s' from runlevel `%s': %s",
-							applet, service, runlevel, strerror (errno));
-			}
+		doadd = false;
+	else
+		eerrorx ("%s: unknown command `%s'", applet, argv[1]);
+
+	for (i = 3; i < argc; i++)
+		runlevels = rc_strlist_add (runlevels, argv[i]);
+
+	if (! runlevels)
+		runlevels = rc_strlist_add (runlevels, rc_get_runlevel ()); 
+
+	retval = EXIT_SUCCESS;
+	STRLIST_FOREACH (runlevels, runlevel, i) {
+		if (doadd) {
+			if (! add (runlevel, service))
+				retval = EXIT_FAILURE;
+		} else {
+			if (! delete (runlevel, service))
+				retval = EXIT_FAILURE;
 		}
-
-		return (EXIT_SUCCESS);
 	}
 
-	eerrorx ("%s: unknown command `%s'", applet, argv[1]);
+	rc_strlist_free (runlevels);
+
+	return (retval);
 }