postrm is in libnss-systemd 237-3ubuntu10.
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 | #!/bin/sh
set -e
remove_nss_entry() {
local file=$1
local pkg=$2
local module=$3
refcount=$(dpkg-query -f '${db:Status-Abbrev} ${binary:Package}\n' \
-W $pkg | grep '^i' | wc -l)
if [ "$refcount" -gt 0 ] ; then
# package is installed for other architectures still, do nothing
return
fi
echo "Checking NSS setup..."
# abort if file does not exist
if ! [ -e $file ]; then
echo "Could not find ${file}."
return
fi
# we must remove possible [foo=bar] options as well
sed -i -r "/(passwd|group):/ s/[[:space:]]+$module\b([[:space:]]*\[[^]]*\])*//" $file
}
if [ "$1" = remove ]; then
remove_nss_entry /etc/nsswitch.conf libnss-systemd systemd
fi
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