postinst is in libapache2-webauth 4.7.0-3build1.
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 | #! /bin/sh
set -e
# On upgrade from versions prior to 4.6.0-2, ensure the keyring is owned by
# www-data if it was owned by root. Earlier versions of WebAuth updated the
# keyring during Apache configuration and therefore created it owned by root,
# but keyring handling is now done in the child processes, so those keyrings
# would no longer be readable.
if [ "$1" = 'configure' ] && [ -f '/var/lib/webauth/keyring' ] ; then
if [ -n "$2" ] && dpkg --compare-versions "$2" lt 4.6.0-2~ ; then
if [ "$(stat -c '%U' /var/lib/webauth/keyring)" = 'root' ] ; then
chown www-data:www-data /var/lib/webauth/keyring
fi
fi
fi
exit 0
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