#!/bin/sh
# postinst script for monit-cn
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
#

case "$1" in
    configure|reconfigure)
      # continue below
    ;;

    *)
        exit 0
    ;;
esac

# import CN-functions
. /usr/share/carnet-tools/functions.sh

# check if monitrc is an empty template
installfile=1
if [ -e /etc/monit/monitrc ]; then
    lines=$(grep -v '^#' /etc/monit/monitrc | wc -l)
    if [ $lines -lt 4 ]; then
        installfile=1
        mv -f /etc/monit/monitrc /etc/monit/monitrc.dpkg-old
    else
        installfile=0
    fi
fi
if [ $installfile -eq 1 ]; then
    echo "CN: Installing default monitrc in /etc/monit/monitrc"
    cp -a /usr/share/monit-cn/monitrc /etc/monit/monitrc
    chmod u=rw,go= /etc/monit/monitrc
fi

# sed monitrc with proper hostname
if grep -q '@localhost' /etc/monit/monitrc; then
    CARNET_HOSTNAME=`hostname`
    CARNET_DOMAINNAME=`hostname --domain`
    cp_check_and_sed '@localhost' \
        "s/@localhost/@$CARNET_HOSTNAME.$CARNET_DOMAINNAME/g" \
        /etc/monit/monitrc || true
fi

# fix "but not on { changed } bug in monitrc
cp_check_and_sed '^set alert [^[:space:]]*@[^[:space:]]* (but )?not on { changed }$' \
    's/^set alert \([^[:space:]]*@[^[:space:]]*\) .*$/set alert \1 only on { uid, gid, size, nonexist, data, icmp, instance, invalid, exec, timeout, resource, checksum, match, timestamp, connection, permission }/g' \
    /etc/monit/monitrc || true

# if alert for "changed" is enabled, disable it ASAP
# we're waiting for "but not on { changed }" to enter in official
# package...
cp_check_and_sed '^set alert [^[:space:]]*@[^[:space:]]*$' \
    's/^set alert \([^[:space:]]*@[^[:space:]]*\)$/set alert \1 only on { uid, gid, size, nonexist, data, icmp, instance, invalid, exec, timeout, resource, checksum, match, timestamp, connection, permission }/g' \
    /etc/monit/monitrc || true

# (re)generate monit.d files
update-monit.d || true

# disable monit startup
cp_check_and_sed '^startup[[:space:]]*=[[:space:]]*1' \
    's/^startup[[:space:]]*=.*/startup=0/g' /etc/default/monit || true

# systemv part
if ! grep -q 'CARNet package monit-cn' /etc/init.d/monit; then
    echo "CN: Disabling monit SystemV script"
    if [ -x "/etc/init.d/monit" ]; then
        update-rc.d -f monit remove >/dev/null 2>&1
        if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
            invoke-rc.d monit stop || true
        else
            /etc/init.d/monit stop || true
        fi
    fi
    if [ -e "/etc/init.d/monit" ]; then
        # shebang
        head -n1 /etc/init.d/monit > /etc/init.d/monit.$$
        # middle part
        cp-update monit-cn /etc/init.d/monit.$$ <<EOF
echo "CN: Monit SystemV init script disabled -- inittab is in use"
echo "CN: Exiting now..."
exit 0
EOF
        # rest of init script
        tail -n+2 /etc/init.d/monit >> /etc/init.d/monit.$$
        mv -f /etc/init.d/monit.$$ /etc/init.d/monit
        chmod +x /etc/init.d/monit
    fi
fi

# install as inittab service
if ! grep -q '/usr/sbin/monit' /etc/inittab; then
    echo "CN: Installing monit service in /etc/inittab"
    cp -a /etc/inittab /etc/inittab.$$
    cp-update monit-cn /etc/inittab.$$ <<EOF
mo:2345:respawn:/usr/sbin/monit -Ic /etc/monit/monitrc
m0:06:wait:/usr/sbin/monit -Ic /etc/monit/monitrc stop myprocess
EOF
    cp_mv /etc/inittab.$$ /etc/inittab
fi

# reload init, since we have new configuration
echo "CN: (Re)starting monit service, please check /var/log/daemon.log"
pkill -9 -f '/usr/sbin/monit$' || true
kill -HUP 1

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0