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diff --git a/meta/classes/overlayfs.bbclass b/meta/classes/overlayfs.bbclass
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-# Class for generation of overlayfs mount units
-#
-# It's often desired in Embedded System design to have a read-only rootfs.
-# But a lot of different applications might want to have a read-write access to
-# some parts of a filesystem. It can be especially useful when your update mechanism
-# overwrites the whole rootfs, but you want your application data to be preserved
-# between updates. This class provides a way to achieve that by means
-# of overlayfs and at the same time keeping the base rootfs read-only.
-#
-# Usage example.
-#
-# Set a mount point for a partition overlayfs is going to use as upper layer
-# in your machine configuration. Underlying file system can be anything that
-# is supported by overlayfs. This has to be done in your machine configuration.
-# QA check fails to catch file existence if you redefine this variable in your recipe!
-#
-#   OVERLAYFS_MOUNT_POINT[data] ?= "/data"
-#
-# The class assumes you have a data.mount systemd unit defined in your
-# systemd-machine-units recipe and installed to the image.
-#
-# Then you can specify writable directories on a recipe base
-#
-#   OVERLAYFS_WRITABLE_PATHS[data] = "/usr/share/my-custom-application"
-#
-# To support several mount points you can use a different variable flag. Assume we
-# want to have a writable location on the file system, but not interested where the data
-# survive a reboot. Then we could have a mnt-overlay.mount unit for a tmpfs file system:
-#
-#   OVERLAYFS_MOUNT_POINT[mnt-overlay] = "/mnt/overlay"
-#   OVERLAYFS_WRITABLE_PATHS[mnt-overlay] = "/usr/share/another-application"
-#
-# Note: the class does not support /etc directory itself, because systemd depends on it
-
-REQUIRED_DISTRO_FEATURES += "systemd overlayfs"
-
-inherit systemd features_check
-
-python do_create_overlayfs_units() {
-    CreateDirsUnitTemplate = """[Unit]
-Description=Overlayfs directories setup
-Requires={DATA_MOUNT_UNIT}
-After={DATA_MOUNT_UNIT}
-DefaultDependencies=no
-
-[Service]
-Type=oneshot
-ExecStart=mkdir -p {DATA_MOUNT_POINT}/workdir{LOWERDIR} && mkdir -p {DATA_MOUNT_POINT}/upper{LOWERDIR}
-RemainAfterExit=true
-StandardOutput=journal
-
-[Install]
-WantedBy=multi-user.target
-"""
-    MountUnitTemplate = """[Unit]
-Description=Overlayfs mount unit
-Requires={CREATE_DIRS_SERVICE}
-After={CREATE_DIRS_SERVICE}
-
-[Mount]
-What=overlay
-Where={LOWERDIR}
-Type=overlay
-Options=lowerdir={LOWERDIR},upperdir={DATA_MOUNT_POINT}/upper{LOWERDIR},workdir={DATA_MOUNT_POINT}/workdir{LOWERDIR}
-
-[Install]
-WantedBy=multi-user.target
-"""
-
-    def prepareUnits(data, lower):
-        from oe.overlayfs import mountUnitName, helperUnitName
-
-        args = {
-            'DATA_MOUNT_POINT': data,
-            'DATA_MOUNT_UNIT': mountUnitName(data),
-            'CREATE_DIRS_SERVICE': helperUnitName(lower),
-            'LOWERDIR': lower,
-        }
-
-        with open(os.path.join(d.getVar('WORKDIR'), mountUnitName(lower)), 'w') as f:
-            f.write(MountUnitTemplate.format(**args))
-
-        with open(os.path.join(d.getVar('WORKDIR'), helperUnitName(lower)), 'w') as f:
-            f.write(CreateDirsUnitTemplate.format(**args))
-
-    overlayMountPoints = d.getVarFlags("OVERLAYFS_MOUNT_POINT")
-    for mountPoint in overlayMountPoints:
-        for lower in d.getVarFlag('OVERLAYFS_WRITABLE_PATHS', mountPoint).split():
-            prepareUnits(d.getVarFlag('OVERLAYFS_MOUNT_POINT', mountPoint), lower)
-}
-
-# we need to generate file names early during parsing stage
-python () {
-    from oe.overlayfs import strForBash, unitFileList
-
-    unitList = unitFileList(d)
-    for unit in unitList:
-        d.appendVar('SYSTEMD_SERVICE:' + d.getVar('PN'), ' ' + unit);
-        d.appendVar('FILES:' + d.getVar('PN'), ' ' + strForBash(unit))
-
-    d.setVar('OVERLAYFS_UNIT_LIST', ' '.join([strForBash(s) for s in unitList]))
-}
-
-do_install:append() {
-    install -d ${D}${systemd_system_unitdir}
-    for unit in ${OVERLAYFS_UNIT_LIST}; do
-        install -m 0444 ${WORKDIR}/${unit} ${D}${systemd_system_unitdir}
-    done
-}
-
-addtask create_overlayfs_units before do_install