avoid heredocs, they don't work on a fully readonly VFS

rc.in

@@ -11,6 +11,9 @@ cfg_mounts+=( 'pts:devpts:/dev/pts:noexec,nosuid,gid=5,mode=0620' )
 cfg_mounts+=( 'mqueue:mqueue:/dev/mqueue:noexec,nosuid,nodev' )
 cfg_mounts+=( 'shm:tmpfs:/dev/shm:defaults,mode=0777' )
 
+# Some temporary directories
+cfg_tmpdirs+=( '/run/lock' '/run/lock/lvm' '/run/lvm' '/run/user' )
+
 # Functions
 rc.rescue() { exec "${cfg_rc_rescue_shell:-"$SHELL"}"; }
 
@@ -24,10 +27,13 @@ rc.motd() {
 	return 0
 }
 
+rc.tmpdirs() {
+	mkdir -p -m0755 "${cfg_tmpdirs[@]}"
+}
+
 rc.mount_misc() {
 	for m in "${cfg_mounts[@]}"; do
-		IFS=':' read fs fs_type mountpoint mount_options <<< "$m"
-
+		echo "$m" | while IFS=':' read fs fs_type mountpoint mount_options; do
 			[[ "$mount_options" ]] || { mount_options='defaults'; }
 
 			mountpoint -q "$mountpoint" || {
@@ -35,6 +41,7 @@ rc.mount_misc() {
 				mount "$fs" -n -t "$fs_type" -o "$mount_options" "$mountpoint"
 			}
 		done
+	done
 }
 
 rc.parse_cmdline() {
@@ -107,6 +114,7 @@ rc.remount_root() {
 
 rc.boot() {
 	rc.mount_misc
+	rc.tmpdirs
 	rc.hostname
 	rc.timezone
 	rc.modules