[OE-core] [PATCH 4/4] initrdscripts/init-live.sh: umount extra mount points

[Hongxu Jia]

Just umount these mount points. After switch_root, let udev/fstab in
rootfs to process these partition. It aligns the principle that `Initrd
is used to mount the root file system at boot time'[1]

[1] https://en.wikipedia.org/wiki/Initial_ramdisk

Umount dev rather mount point to avoid `spaces in the mount points to
actual ASCII char'

Here are test steps:
$ echo 'INITRAMFS_SCRIPTS = "initramfs-live-boot initramfs-live-install \
    initramfs-live-install-efi"' >> conf/local.conf
$ echo 'IMAGE_FSTYPES_pn-core-image-minimal_append = " live"' >> conf/local.conf
$ echo 'KERNEL_FEATURES_append = " features/overlayfs/overlayfs.scc"' >> conf/local.conf
$ bitbake core-image-minimal
$ runqemu core-image-minimal slirp iso
qemux86-64 login: root
root at qemux86-64:~# touch /abc

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 meta/recipes-core/initrdscripts/files/init-live.sh | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/meta/recipes-core/initrdscripts/files/init-live.sh b/meta/recipes-core/initrdscripts/files/init-live.sh
index 65183d7..068e049 100644
--- a/meta/recipes-core/initrdscripts/files/init-live.sh
+++ b/meta/recipes-core/initrdscripts/files/init-live.sh
@@ -92,15 +92,11 @@ boot_live_root() {
     mkdir -p  ${ROOT_MOUNT}/media/realroot
     mount -n --move "/run/media/${ROOT_DISK}" ${ROOT_MOUNT}/media/realroot
 
-    # Move the mount points of some filesystems over to
-    # the corresponding directories under the real root filesystem.
-    for dir in `awk '/\/dev.* \/run\/media/{print $2}' /proc/mounts`; do
-        # Parse any OCT or HEX encoded chars such as spaces
-        # in the mount points to actual ASCII chars
-        dir=`printf $dir`
-        mkdir -p "${ROOT_MOUNT}/media/${dir##*/}"
-        mount -n --move "$dir" "${ROOT_MOUNT}/media/${dir##*/}"
+    # Umount available mount points
+    for dev in `awk '/\/dev.* \/run\/media/{print $1}' /proc/mounts`; do
+        umount $dev
     done
+
     mount -n --move /proc ${ROOT_MOUNT}/proc
     mount -n --move /sys ${ROOT_MOUNT}/sys
     mount -n --move /dev ${ROOT_MOUNT}/dev
-- 
2.7.4