x-mounts: Introduce recipe for system partition mount units

This components defines, generates and provides systemd mount units for
the system partitions (based on filesystem labels) as it follows:

boot partition -> label "boot" -> "mountpoint: /run/mount/boot"
devdata partition -> label "devdata" -> "mountpoint: /run/mount/devdata"
sysdata partition -> label "sysdata" -> "mountpoint: /run/mount/sysdata"
appdata partition -> label "appdata" -> "mountpoint: /run/mount/appdata"

When installed, the units are enabled early in the boot process as part
of the local-fs.target.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-core/recipes-core/x-mounts/x-mounts.bb

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+SUMMARY = "Systemd mount units for the provided partitions"
+SECTION = "base"
+DESCRIPTION = "This recipe provides a set of mount units for the partition \
+table used for the OS. It becomes the foundation of various functionalities. \
+For example, runtime state management as part of a separatae state partition \
+(sysdata)"
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
+
+SRC_URI = " \
+    file://run-mount-boot.mount \
+    file://run-mount-devdata.mount \
+    file://run-mount-appdata.mount \
+    file://run-mount-sysdata.mount \
+    "
+
+inherit allarch systemd
+
+SYSTEMD_SERVICE_${PN} = " \
+    run-mount-boot.mount \
+    run-mount-sysdata.mount \
+    run-mount-devdata.mount \
+    run-mount-appdata.mount \
+    "
+SYSTEMD_AUTO_ENABLE = "enable"
+
+LABELS = " \
+    ${BOOT_PARTITION_LABEL} \
+    ${DEVDATA_PARTITION_LABEL} \
+    ${APPDATA_PARTITION_LABEL} \
+    ${SYSDATA_PARTITION_LABEL} \
+    "
+
+do_install () {
+    install -d ${D}${systemd_unitdir}/system
+    for label in ${LABELS}; do
+        install -m 0644 "${WORKDIR}/run-mount-${label}.mount" "${D}${systemd_unitdir}/system"
+    done
+}
+
+FILES_${PN} += "${systemd_unitdir}"

meta-ohos-core/recipes-core/x-mounts/x-mounts/run-mount-appdata.mount

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+[Unit]
+Description=Application Data File System
+DefaultDependencies=no
+Conflicts=umount.target
+Before=local-fs.target umount.target
+
+[Mount]
+What=/dev/disk/by-label/appdata
+Where=/run/mount/appdata
+
+[Install]
+WantedBy=local-fs.target

meta-ohos-core/recipes-core/x-mounts/x-mounts/run-mount-boot.mount

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+[Unit]
+Description=Boot File System
+DefaultDependencies=no
+Conflicts=umount.target
+Before=local-fs.target umount.target
+
+[Mount]
+What=/dev/disk/by-label/boot
+Where=/run/mount/boot
+
+[Install]
+WantedBy=local-fs.target

meta-ohos-core/recipes-core/x-mounts/x-mounts/run-mount-devdata.mount

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+[Unit]
+Description=Device Data File System
+DefaultDependencies=no
+Conflicts=umount.target
+Before=local-fs.target umount.target
+
+[Mount]
+What=/dev/disk/by-label/devdata
+Where=/run/mount/devdata
+Options=ro
+
+[Install]
+WantedBy=local-fs.target

meta-ohos-core/recipes-core/x-mounts/x-mounts/run-mount-sysdata.mount

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+[Unit]
+Description=System Data File System
+DefaultDependencies=no
+Conflicts=umount.target
+Before=local-fs.target umount.target
+
+[Mount]
+What=/dev/disk/by-label/sysdata
+Where=/run/mount/sysdata
+
+[Install]
+WantedBy=local-fs.target