systemd-systemctl: Add preset capability

systemd has presets as described here

http://lists.freedesktop.org/archives/systemd-devel/2011-July/002830.html

This patch will let distros define presets file
which will override the enable/disable specified
by recipes.

systemctl preset without any argument will run presents
on all services

systemctl preset service1 service2 will run presets on
specified pervice.

something like enable * or disable *
would mean that all services will be either enabled or
disabled by default.

If no user-presets are specified then 'enable' is default

systemd allows basic globs but we do not implement them
except '*'

(From OE-Core rev: 1254416901a0c70814296a86784f4934f27c7d4a)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/systemd/systemd-systemctl/systemctl

@@ -28,6 +28,14 @@ while [ $# != 0 ]; do
 		mask)
 			shift
 
+			action="$opt"
+			services="$1"
+			cmd_args="1"
+			shift
+			;;
+		preset)
+			shift
+
 			action="$opt"
 			services="$1"
 			cmd_args="1"
@@ -49,8 +57,16 @@ while [ $# != 0 ]; do
 			;;
 	esac
 done
+if [ "$action" = "preset" -a "$service_file" = "" ]; then
+	services=$(for f in `find $ROOT/etc/systemd/system $ROOT/lib/systemd/system $ROOT/usr/lib/systemd/system -type f 2>1`; do basename $f; done)
+	services="$services $opt"
+	presetall=1
+fi
 
 for service in $services; do
+	if [ "$presetall" = "1" ]; then
+		action="preset"
+	fi
 	if [ "$action" = "mask" ]; then
 		if [ ! -d $ROOT/etc/systemd/system/ ]; then
 			mkdir -p $ROOT/etc/systemd/system/
@@ -80,7 +96,17 @@ for service in $services; do
 	# If any new unit types are added to systemd they should be added
 	# to this regular expression.
 	unit_types_re='\.\(service\|socket\|device\|mount\|automount\|swap\|target\|path\|timer\|snapshot\)$'
-
+	if [ "$action" = "preset" ]; then
+		action=`egrep -sh  $service $ROOT/etc/systemd/user-preset/*.preset | cut -f1 -d' '`
+		if [ -z "$action" ]; then
+			globalpreset=`egrep -sh  '\*'  $ROOT/etc/systemd/user-preset/*.preset | cut -f1 -d' '`
+			if [ -n "$globalpreset" ]; then
+				action="$globalpreset"
+			else
+				action="enable"
+			fi
+		fi
+	fi
 	# create the required symbolic links
 	wanted_by=$(sed '/^WantedBy[[:space:]]*=/s,[^=]*=,,p;d' "$ROOT/$service_file" \
 		        | tr ',' '\n' \