Replace mdev with udev, add some script to make udev works correctly.

package/eudev/S10udev

@@ -21,13 +21,79 @@ UDEV_CONFIG=/etc/udev/udev.conf
 test -r $UDEV_CONFIG || exit 6
 . $UDEV_CONFIG
 
+# we need to unmount /dev/pts/ and remount it later over the devtmpfs
+unmount_devpts() {
+    if mountpoint -q /dev/pts/; then
+        umount -n -l /dev/pts/
+    fi
+
+    if mountpoint -q /dev/shm/; then
+        umount -n -l /dev/shm/
+    fi
+}
+
+# mount a devtmpfs over /dev, if somebody did not already do it
+mount_devtmpfs() {
+    if grep -E -q "^[^[:space:]]+ /dev devtmpfs" /proc/mounts; then
+        mount -n -o remount,nosuid,mode=0755 -t devtmpfs devtmpfs /dev
+        return
+    fi
+
+    if ! mount -n -o nosuid,mode=0755 -t devtmpfs devtmpfs /dev; then
+        echo "udev requires devtmpfs support, not started"
+    fi
+
+    return 0
+}
+
+create_dev_makedev() {
+    if [ -e /sbin/MAKEDEV ]; then
+        ln -sf /sbin/MAKEDEV /dev/MAKEDEV
+    else
+        ln -sf /bin/true /dev/MAKEDEV
+    fi
+}
+
+make_static_nodes() {
+    [ -e /lib/modules/$(uname -r)/modules.devname ] || return 0
+    [ -x /bin/kmod ] || return 0
+
+    /bin/kmod static-nodes --format=tmpfiles --output=/proc/self/fd/1 | \
+    while read type name mode uid gid age arg; do
+        [ -e $name ] && continue
+        case "$type" in
+            c|b|c!|b!) mknod -m $mode $name $type $(echo $arg | sed 's/:/ /') ;;
+            d|d!) mkdir $name ;;
+            *) echo "unparseable line ($type $name $mode $uid $gid $age $arg)" >&2 ;;
+        esac
+
+        if [ -x /sbin/restorecon ]; then
+            /sbin/restorecon $name
+        fi
+    done
+}
+
 case "$1" in
     start)
+        if ! mountpoint -q /dev/; then
+            unmount_devpts
+            mount_devtmpfs
+        fi
+
+        make_static_nodes
+
+        # clean up parts of the database created by the initramfs udev
+        udevadm info --cleanup-db
+
+        # set the SELinux context for devices created in the initramfs
+        [ -x /sbin/restorecon ] && /sbin/restorecon -R /dev
+
         printf "Populating %s using udev: " "${udev_root:-/dev}"
         [ -e /proc/sys/kernel/hotplug ] && printf '\000\000\000\000' > /proc/sys/kernel/hotplug
         /sbin/udevd -d || { echo "FAIL"; exit 1; }
         udevadm trigger --type=subsystems --action=add
         udevadm trigger --type=devices --action=add
+        create_dev_makedev
         udevadm settle --timeout=30 || echo "udevadm settle failed"
         echo "done"
         ;;