udev-extraconf: Add systemd-mount to udev-extraconf/mount.sh

Udev-extraconf works correctly with sysvinit in the aspect of automounting
block devices. But it has a serious problem in case of systemd. Block devices
automounted by udev is unaccessible to host space(out of udevd's private
namespace). For example, we cannot format those block devices.

e.g.
    root@qemux86:~# mkfs.ext4 /dev/sda1
    mke2fs 1.43.8 (1-Jan-2018)
    /dev/sda1 contains a ext4 file system
    last mounted on Tue Apr  3 06:22:41 2018
    Proceed anyway? (y,N) y
    /dev/sda1 is apparently in use by the system; will not make a filesystem here!

Other distributions has no such problem, because they use a series of rules to
manager block devices. Different types of block devices match different rules.
But udev-extraconf just use one rule, automount.rules, which results in this
problem.

The 'systemd-mount' command is recommended by the systemd community to solve such
problems.

This patch makes use of 'systemd-mount' to solve the above problem.

[YOCTO #12644]

(From OE-Core rev: a0b3389c5afc23f622f793cbad8b4135093e6f08)

(From OE-Core rev: 4af22800a7af4fcb80cafe08d982a4850d9dd2ad)

Signed-off-by: Hongzhi.Song <hongzhi.song@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/udev/udev-extraconf/mount.sh

@@ -4,10 +4,28 @@
 #
 # Attempt to mount any added block devices and umount any removed devices
 
+BASE_INIT="`readlink "@base_sbindir@/init"`"
+INIT_SYSTEMD="@systemd_unitdir@/systemd"
+
+if [ "x$BASE_INIT" = "x$INIT_SYSTEMD" ];then
+    # systemd as init uses systemd-mount to mount block devices
+    MOUNT="/usr/bin/systemd-mount"
+    UMOUNT="/usr/bin/systemd-umount"
+
+    if [ -x $MOUNT ] && [ -x $UMOUNT ];
+    then
+        logger "Using systemd-mount to finish mount"
+    else
+        logger "Linux init is using systemd, so please install systemd-mount to finish mount"
+        exit 1
+    fi
+else
+    MOUNT="/bin/mount"
+    UMOUNT="/bin/umount"
+fi
 
-MOUNT="/bin/mount"
 PMOUNT="/usr/bin/pmount"
-UMOUNT="/bin/umount"
+
 for line in `grep -h -v ^# /etc/udev/mount.blacklist /etc/udev/mount.blacklist.d/*`
 do
 	if [ ` expr match "$DEVNAME" "$line" ` -gt 0 ];
@@ -17,7 +35,35 @@ do
 	fi
 done
 
-automount() {	
+automount_systemd() {
+    name="`basename "$DEVNAME"`"
+
+    [ -d "/run/media/$name" ] || mkdir -p "/run/media/$name"
+
+    MOUNT="$MOUNT -o silent"
+
+    # If filesystemtype is vfat, change the ownership group to 'disk', and
+    # grant it with  w/r/x permissions.
+    case $ID_FS_TYPE in
+    vfat|fat)
+        MOUNT="$MOUNT -o umask=007,gid=`awk -F':' '/^disk/{print $3}' /etc/group`"
+        ;;
+    # TODO
+    *)
+        ;;
+    esac
+
+    if ! $MOUNT --no-block -t auto $DEVNAME "/run/media/$name"
+    then
+        #logger "mount.sh/automount" "$MOUNT -t auto $DEVNAME \"/run/media/$name\" failed!"
+        rm_dir "/run/media/$name"
+    else
+        logger "mount.sh/automount" "Auto-mount of [/run/media/$name] successful"
+        touch "/tmp/.automount-$name"
+    fi
+}
+
+automount() {
 	name="`basename "$DEVNAME"`"
 
 	! test -d "/run/media/$name" && mkdir -p "/run/media/$name"
@@ -26,7 +72,7 @@ automount() {
 	then
 		MOUNT="$MOUNT -o silent"
 	fi
-	
+
 	# If filesystem type is vfat, change the ownership group to 'disk', and
 	# grant it with  w/r/x permissions.
 	case $ID_FS_TYPE in
@@ -68,23 +114,26 @@ if [ "$ACTION" = "add" ] && [ -n "$DEVNAME" ] && [ -n "$ID_FS_TYPE" -o "$media_t
 	elif [ -x $MOUNT ]; then
     		$MOUNT $DEVNAME 2> /dev/null
 	fi
-	
+
 	# If the device isn't mounted at this point, it isn't
 	# configured in fstab (note the root filesystem can show up as
 	# /dev/root in /proc/mounts, so check the device number too)
-	if expr $MAJOR "*" 256 + $MINOR != `stat -c %d /`; then
-		grep -q "^$DEVNAME " /proc/mounts || automount
-	fi
+    if expr $MAJOR "*" 256 + $MINOR != `stat -c %d /`; then
+        if [ "`basename $MOUNT`" = "systemd-mount" ];then
+            grep -q "^$DEVNAME " /proc/mounts || automount_systemd
+        else
+            grep -q "^$DEVNAME " /proc/mounts || automount
+        fi
+    fi
 fi
 
-
 if [ "$ACTION" = "remove" ] || [ "$ACTION" = "change" ] && [ -x "$UMOUNT" ] && [ -n "$DEVNAME" ]; then
-	for mnt in `cat /proc/mounts | grep "$DEVNAME" | cut -f 2 -d " " `
-	do
-		$UMOUNT $mnt
-	done
-	
-	# Remove empty directories from auto-mounter
-	name="`basename "$DEVNAME"`"
-	test -e "/tmp/.automount-$name" && rm_dir "/run/media/$name"
+    for mnt in `cat /proc/mounts | grep "$DEVNAME" | cut -f 2 -d " " `
+    do
+        $UMOUNT $mnt
+    done
+
+    # Remove empty directories from auto-mounter
+    name="`basename "$DEVNAME"`"
+    test -e "/tmp/.automount-$name" && rm_dir "/run/media/$name"
 fi

meta/recipes-core/udev/udev-extraconf_1.1.bb

@@ -29,6 +29,9 @@ do_install() {
     install -d ${D}${sysconfdir}/udev/scripts/
 
     install -m 0755 ${WORKDIR}/mount.sh ${D}${sysconfdir}/udev/scripts/mount.sh
+    sed -i 's|@systemd_unitdir@|${systemd_unitdir}|g' ${D}${sysconfdir}/udev/scripts/mount.sh
+    sed -i 's|@base_sbindir@|${base_sbindir}|g' ${D}${sysconfdir}/udev/scripts/mount.sh
+
     install -m 0755 ${WORKDIR}/network.sh ${D}${sysconfdir}/udev/scripts
 }