postinst is in libsss-sudo 1.11.5-1ubuntu3.
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.
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set -e
case "$1" in
configure)
ldconfig
;;
abort-upgrade|abort-remove|abort-deconfigure)
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
# This code was taken from libnss-myhostname, which got it from nss-mdns:
log() {
echo "$*"
}
# try to insert sss entries to the passwd, group, shadow and netgroup
# lines in /etc/nsswitch.conf to automatically enable libnss-sss
# support; do not change the configuration if the lines already
# references some sss lookups
insert_nss_entry() {
log "Checking NSS setup..."
# abort if /etc/nsswitch.conf does not exist
if ! [ -e /etc/nsswitch.conf ]; then
log "Could not find /etc/nsswitch.conf."
return
fi
if grep -q ^sudoers /etc/nsswitch.conf; then
# append 'sss' to the end of the line if it's not found already
sed -i --regexp-extended '
/^(sudoers):/ {
/\bsss\b/! s/$/ sss/
}
' /etc/nsswitch.conf
else
echo "sudoers: files sss" >> /etc/nsswitch.conf
fi
}
action="$1"
if [ configure = "$action" ]; then
if [ -z "$2" ]; then
log "First installation detected..."
# first install: setup the recommended configuration (unless
# nsswitch.conf already contains sss entries)
insert_nss_entry
else
# upgrade
version="$2"
# Nothing to do here yet
fi
fi
exit 0
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