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Diffstat (limited to 'debian/90overlay-root/overlay-mount.sh')
| -rw-r--r-- | debian/90overlay-root/overlay-mount.sh | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/debian/90overlay-root/overlay-mount.sh b/debian/90overlay-root/overlay-mount.sh new file mode 100644 index 0000000..27d0312 --- /dev/null +++ b/debian/90overlay-root/overlay-mount.sh @@ -0,0 +1,39 @@ +#!/bin/sh + +# make a read-only nfsroot writeable by using overlayfs +# the nfsroot is already mounted to $NEWROOT +# add the parameter rootovl to the kernel, to activate this feature + +. /lib/dracut-lib.sh + +if ! getargbool 0 rootovl ; then + return +fi + +modprobe overlay + +# a little bit tuning +mount -o remount,nolock,noatime $NEWROOT + +# Move root +# --move does not always work. Google >mount move "wrong fs"< for +# details +mkdir -p /live/image +mount --bind $NEWROOT /live/image +umount $NEWROOT + +# Create tmpfs +mkdir /cow +mount -n -t tmpfs -o mode=0755 tmpfs /cow +mkdir /cow/work /cow/rw + +# Merge both to new Filesystem +mount -t overlay -o noatime,lowerdir=/live/image,upperdir=/cow/rw,workdir=/cow/work,default_permissions overlay $NEWROOT + +# Let filesystems survive pivot +mkdir -p $NEWROOT/live/cow +mkdir -p $NEWROOT/live/image +mount --bind /cow/rw $NEWROOT/live/cow +umount /cow +mount --bind /live/image $NEWROOT/live/image +umount /live/image |