postinst is in linux-image-4.15.0-1021-kvm 4.15.0-1021.21.
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 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | #!/bin/sh
set -e
version=4.15.0-1021-kvm
image_path=/boot/vmlinuz-$version
#
# When we install linux-image we have to run kernel postinst.d support to
# generate the initramfs, create links etc. Should it have an associated
# linux-image-extra package and we install that we also need to run kernel
# postinst.d, to regenerate the initramfs. If we are installing both at the
# same time, we necessarily trigger kernel postinst.d twice. As this includes
# rebuilding the initramfs and reconfiguring the boot loader this is very time
# consuming.
#
# Similarly for removal when we remove the linux-image-extra package we need to
# run kernel postinst.d handling in order to pare down the initramfs to
# linux-image contents only. When we remove the linux-image need to remove the
# now redundant initramfs. If we are removing both at the same time, then
# we will rebuilt the initramfs and then immediatly remove it.
#
# Switches to using a trigger against the linux-image package for all
# postinst.d and postrm.d handling. On installation postinst.d gets triggered
# twice once by linux-image and once by linux-image-extra. As triggers are
# non-cumulative we will only run this processing once. When removing both
# packages we will trigger postinst.d from linux-image-extra and then in
# linux-image postrm.d we effectivly ignore the pending trigger and simply run
# the postrm.d. This prevents us from rebuilding the initramfs.
#
if [ "$1" = triggered ]; then
trigger=/usr/lib/linux/triggers/$version
if [ -f "$trigger" ]; then
sh "$trigger"
rm -f "$trigger"
fi
exit 0
fi
if [ "$1" != configure ]; then
exit 0
fi
depmod $version
if [ -f /lib/modules/$version/.fresh-install ]; then
change=install
else
change=upgrade
fi
linux-update-symlinks $change $version $image_path
rm -f /lib/modules/$version/.fresh-install
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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