preinst is in linux-image-unsigned-4.15.0-1036-azure 4.15.0-1036.38~16.04.1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | #!/bin/sh
set -e
version=4.15.0-1036-azure
image_path=/boot/vmlinuz-$version
if [ "$1" = abort-upgrade ]; then
exit 0
fi
if [ "$1" = install ]; then
# Create a flag file for postinst
mkdir -p /lib/modules/$version
touch /lib/modules/$version/.fresh-install
fi
if [ -d /etc/kernel/preinst.d ]; then
DEB_MAINT_PARAMS="$*" run-parts --report --exit-on-error --arg=$version \
--arg=$image_path /etc/kernel/preinst.d
fi
exit 0
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