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#!/sbin/runscript
description="Export ZFS Root Filesystem"
copy_binaries() {
local destdir=$1
shift
lddtree "$@" \
| tr ')(' '\n' \
| awk '/=>/{ if($3 ~ /^\//){print $3}}' \
| sort \
| uniq \
| cpio -p --make-directories --dereference --quiet $destdir
}
depend()
{
need mount-ro
keyword -prefix -openvz -vserver -lxc
}
start()
{
ROOTFSTYPE=$(df -TP / | awk 'NR>1{print $2}')
TMPDIR='/dev/pivot_root'
MOVEFS=$(df -TP -x zfs | awk 'NR>2{print $7}')
# Make sure that we are dealing with zfs
test "${ROOTFSTYPE}" = "zfs" || eerror "rootfs is not zfs" && exit
# Construct new rootfs
mkdir -p "${TMPDIR}"
mount -t tmpfs none ${TMPDIR}
mkdir "${TMPDIR}/oldroot" "${TMPDIR}/dev"
mknod -m 660 "${TMPDIR}/dev/null" c 1 3
mknod -m 660 "${TMPDIR}/dev/zfs" c 10 59
# Make tmpfs root filesystem
copy_binaries ${TMPDIR} $(which chroot sh cat mount mkdir zfs zpool)
# Make directories for temporary mounts
for i in $(seq $(echo "$MOVEFS" | wc -w)); do mkdir "${TMPDIR}/${i}"; done;
# Pass temporary mount information to chroot
echo "$MOVEFS" > "${TMPDIR}/movefs"
# Copy shutdown script
cp /usr/share/zfs/linuxrc "${TMPDIR}/linuxrc"
# Pivot into new root
cd "${TMPDIR}"
pivot_root . oldroot
exec chroot . /linuxrc
}
|
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