preinst is in squid 3.5.23-5+deb9u1.
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
#
# If the squid3 package was being used previously...
#
if test -d /etc/squid3 ; then
if test ! -d /etc/squid; then
mkdir /etc/squid
fi
#
# Remove obsolete MSNT helper config
#
dpkg-maintscript-helper rm_conffile \
/etc/squid3/msntauth.conf 3.5.4-1~ squid3 -- "$@"
#
# Move old squid3 config files into position
#
dpkg-maintscript-helper mv_conffile \
/etc/squid3/squid.conf /etc/squid/squid.conf 3.5.4-1~ squid3 -- "$@"
dpkg-maintscript-helper mv_conffile \
/etc/squid3/errorpage.css /etc/squid/errorpage.css 3.5.4-1~ squid3 -- "$@"
fi
case "$1" in
upgrade|install)
#
# If the squid (2.7) package was being used previously protect
# the squid.conf file, which was not tracked as a conffile.
# Use '< 2.8' version to catch backports and security versions.
#
# Except, when a squid3 package was used we do want the
# debconf questions to appear as the packages get merged.
#
if dpkg --compare-versions "$2" lt '2.8' && [ ! -f /etc/squid3/squid.conf ] && [ -f /etc/squid/squid.conf ];then
echo "Preserving old /etc/squid/squid.conf"
mv /etc/squid/squid.conf /etc/squid/squid.conf.pre3.5_upgrade
fi
;;
abort-upgrade)
exit 0
;;
esac
#
# Add the "proxy" user/group to /etc/passwd if needed.
#
if ! grep -q "^proxy:" /etc/passwd
then
#
# Let's hope that this works; if /var/spool/squid is
# already present this fails :(
#
adduser --system --home /var/spool/squid --group proxy
#
# Change the shell so that cron jobs will work.
# (They run as root now, but you can never know).
#
chsh -s /bin/sh proxy
fi
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
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