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#!/bin/sh
run_hook() {
echo "GrowRootFS: starting"
# if a file indicates we should do nothing, then just exit
for f in /var/lib/cloud/instance/root-grown /etc/growroot-disabled \
/etc/growroot-grown; do
[ -f "${rootmnt}$f" ] && echo "GrowRootFS: disabled by file" && return 0
done
# figure out what disk '$root' is on
{ [ ! -L "${root}" ] && rootdev=${root} || rootdev=$(readlink -f "${root}") ; } || { echo "failed to get target of link for ${root}" && return 0 ; }
case "${rootdev}" in
*[0-9]) : ;;
# the root is a disk, not a partition (does not end in a digit)
# no need to do anything in this case, kernel already knows the full size.
*) echo "GrowRootFS: ${rootdev} is a disk, not a partition, no action" && return 0 ;;
esac
# remove all consective numbers from the end of rootdev to get 'rootdisk'
rootdisk=${rootdev}
while [ "${rootdisk%[0-9]}" != "${rootdisk}" ]; do
rootdisk=${rootdisk%[0-9]};
done
partnum=${rootdev#${rootdisk}}
# if the basename of the root device (ie 'xvda1' or 'sda1') exists
# in /sys/block/ then it is a block device, not a partition
# (xen xvda1 is an example of such a funny named block device)
[ -e "/sys/block/${rootdev##*/}" ] && echo "GrowRootFS: ${rootdev} is a block device" && return 0
# if growpart fails, exit.
# we capture stderr because on success of dry-run, it writes
# to stderr what it would do.
out=$(growpart --dry-run "${rootdisk}" "${partnum}" 2>&1) || { echo "GrowRootFS: ${out}" && return 1; }
# if growpart would change something, --dry-run will write something like
# CHANGE: partition=1 start=2048 old: size=1024000 end=1026048 new: size=2089192,end=2091240
# anything else, exit
case "${out}" in
CHANGE:*) :;;
*) echo "GrowRootFS: ${out}" && return 0;;
esac
## Wait for any of the initial udev events to finish
## This is to avoid any other processes using the block device that the
## root partition is on, which would cause the sfdisk 'BLKRRPART' to fail.
udevadm settle --timeout ${rootdelay:-30} || { echo "GrowRootFS: WARNING: udevadm settle prior to growpart failed" && return 1 ; }
if out=$(growpart "${rootdisk}" "${partnum}" 2>&1); then
case "$out" in
CHANGED:*) echo "GrowRootFS: $out";;
NOCHANGE:*)
echo "GrowRootFS: WARNING: expected to grow partition, but did not";;
*) echo "GrowRootFS: unexpected output: ${out}"
esac
else
echo "GrowRootFS: WARNING: resize failed: $out"
fi
## Wait for the partition re-read events to complete
## so that the root partition is available when we try and mount it.
udevadm settle --timeout ${rootdelay:-30}
# Need to figure out the rootfs type somehow
# For now we only support ext2/3/4
fsck -f ${rootdev}
resize2fs -p ${rootdev}
## write to /etc/grownroot-grown. most likely this wont work (readonly)
{ date --utc > "${rootmnt}/etc/growroot-grown" ; } >/dev/null 2>&1 || :
echo "GrowRootFS: done"
sleep 1
}
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