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#!/bin/bash -e
kver=$(uname -r)
while read -r line; do
# We only care about the running kernel
if [[ "$line" == "usr/lib/modules/$kver/vmlinuz" ]];then
if mountpoint --nofollow --quiet /${line%vmlinuz};then
# Mount point is already present
# This means we already ran that hook during 'remove case'
#
# Remove the mount so we can reinstall the kernel
# Most of the time udevd would block the umount, so suppress the first error message
umount /${line%vmlinuz} 2>/dev/null || umount --lazy /${line%vmlinuz}
rmdir /${line%vmlinuz}
elif [[ -f "$line" && ! -d "/usr/lib/running-kernel-modules" ]];then
# Kernel install is present and we do not have a copy
#
# This is the removal case, so we save the kernel
mkdir /usr/lib/running-kernel-modules
cp --archive --link --no-target-directory /usr/lib/modules/${kver}/ \
/usr/lib/running-kernel-modules/
fi
# If we are re-removing the running kernel, (after removing + reinstalling),
# we already have a backup and this hook is a no-op
fi
done
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