init-live.sh: avoid duplicate mount points for the same filesystem

A live system had duplicate mount points for the same filesystem
in the output of 'mount' command. That was because we didn't handle
the temporary mounts properly before switch_root.

This patch fixes this problem by moving the mount points of some
filesystems to the corresponding directories in the real root filesystem.

[YOCTO #3155]

(From OE-Core rev: 050a745413f8bb26212b84da391e0f7665f77728)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/meta/recipes-core/initrdscripts/files/init-live.sh b/meta/recipes-core/initrdscripts/files/init-live.sh
index e8d7f70c2c..0ae359d617 100644
--- a/meta/recipes-core/initrdscripts/files/init-live.sh
+++ b/meta/recipes-core/initrdscripts/files/init-live.sh
@@ -59,10 +59,11 @@ read_args() {
 boot_live_root() {
     killall udevd 2>/dev/null
 
-    # use devtmpfs if available
-    if grep -q devtmpfs /proc/filesystems; then
-        mount -t devtmpfs devtmpfs $ROOT_MOUNT/dev
-    fi
+    # Move the mount points of some filesystems over to
+    # the corresponding directories under the real root filesystem.
+    mount -n --move /proc ${ROOT_MOUNT}/proc
+    mount -n --move /sys ${ROOT_MOUNT}/sys
+    mount -n --move /dev ${ROOT_MOUNT}/dev
 
     cd $ROOT_MOUNT
     exec switch_root -c /dev/console $ROOT_MOUNT /sbin/init