Refactor some non-idiomatic architecture handling in

live-build/ubuntu-cpc/hooks/999-cpc-fixes.chroot

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.375) UNRELEASED; urgency=medium
+
+  * Refactor some non-idiomatic architecture handling in
+    live-build/ubuntu-cpc/hooks/999-cpc-fixes.chroot
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Tue, 02 Feb 2016 20:33:23 -0800
+
 livecd-rootfs (2.374) xenial; urgency=medium
 
   [ Michael Vogt ]

live-build/ubuntu-cpc/hooks/999-cpc-fixes.chroot

@@ -126,30 +126,29 @@ fi
 
 #### END COMMON ARCH FUNCTIONS
 
-if [ "$arch" = "ppc64el" ]; then
-   add_serial_console hvc0
-   exit 0
-fi
 
+case $arch in
 	# ARM images are special
-if [[ "$arch" =~ (arm|arm64|aarch64) ]]; then
-
+	armhf|arm64)
 		echo "Configuring ARM Serial Port"
 		add_serial_console ttyAMA0
 
 		echo "Image architecture is ARM. Existing vmbuilder-fixups"
 
 		exit 0
-fi
-
-if [ "$arch" = "s390x" ]; then
-    exit 0
-fi
-
+		;;
 	## Add ttyS0 for i386/amd64 for Trusty and newer
-if [ "$arch" = "i386" -o "$arch" = "amd64" ]; then
+	i386|amd64)
 		add_serial_console ttyS0
-fi
+		;;
+	ppc64el)
+		add_serial_console hvc0
+		exit 0
+		;;
+	s390x)
+		exit 0
+		;;
+esac
 
 psuedo_grub_probe() {
    cat <<"PSUEDO_GRUB_PROBE"