postinst is in linux-modules-extra-4.15.0-1018-gcp 4.15.0-1018.19.
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 | #!/bin/sh
set -e
version=4.15.0-1018-gcp
image_path=/boot/vmlinuz-$version
if [ "$1" != configure ]; then
exit 0
fi
depmod -a -F /boot/System.map-$version $version || true
if [ -d /etc/kernel/postinst.d ]; then
mkdir -p /usr/lib/linux/triggers
cat - >/usr/lib/linux/triggers/$version <<EOF
DEB_MAINT_PARAMS="$*" run-parts --report --exit-on-error --arg=$version \
--arg="$image_path" /etc/kernel/postinst.d
EOF
dpkg-trigger --no-await linux-update-$version
fi
exit 0
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