From 09655210344e117917a2e32610b42144dc5518ef Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Fri, 01 Jun 2018 23:04:09 -0400
Subject: bin/rc: Invalidate session types with empty ancestor types

And replace unnecessary double quotes with no interpolation.
---
diff --git a/bin/rc b/bin/rc
index 8b14849..0b06c19 100755
--- a/bin/rc
+++ b/bin/rc
@@ -34,7 +34,7 @@ valid_session_type()
 	local session_type="${1}"
 	shift 1
 
-	case "${session_type}" in *[!A-Za-z0-9:]* | '' | ':'* | *':' | ':')
+	case "${session_type}" in *[!A-Za-z0-9:]* | '' | ':'* | *':' | *'::'*)
 		return 1
 	esac
 	return 0
@@ -204,7 +204,7 @@ start()
 		run_daemon "${session_type}" &
 	else
 		# Signal the running rc daemon.
-		printf "%s beg %s\n" "${MAGIC}" "${session_type}" \
+		printf '%s beg %s\n' "${MAGIC}" "${session_type}" \
 			1>"${rc_fifo}"
 	fi
 
@@ -223,7 +223,7 @@ stop()
 		return 1
 	else
 		# Signal the running rc daemon.
-		printf "%s end %s\n" "${MAGIC}" "${session_type}" \
+		printf '%s end %s\n' "${MAGIC}" "${session_type}" \
 			1>"${rc_fifo}"
 	fi
 
@@ -247,7 +247,7 @@ status()
 			return 1
 		fi
 		# Signal the running rc daemon.
-		printf "%s who %s\n" "${MAGIC}" "${res_fifo}" \
+		printf '%s who %s\n' "${MAGIC}" "${res_fifo}" \
 			1>"${rc_fifo}"
 		if read -r magic list 0<"${res_fifo}" && \
 				[ "x${magic}" = "x${MAGIC}" ]; then
--
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