#!/bin/sh

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>
#        * <postinst> `abort-remove'
#        * <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


migrate_seedd_conf()
{
    local oldconf='/etc/default/seedd'
    local newconf='/etc/bit-babbler/seedd.conf'
    local saveconf="${oldconf}.dpkg-old"

    # Remove the old config if it was unmodified
    rm -f "${oldconf}.dpkg-remove"

    # Otherwise, if it's still there and we still own it, let's convert it.
    [ -e "$oldconf" ] || return 0
    dpkg-query -L bit-babbler | grep -F -q -x "$oldconf" || return 0

    # Preserve the new config file that was shipped with the package, in the
    # same way as if the user had chosen "keep my local changes" at the dpkg
    # conffile update prompt.  Except for this we keep them without prompting.
    [ ! -e "$newconf" ] || mv -f "$newconf" "${newconf}.dpkg-new"

    # Simulate how the old config was converted to command line options in the
    # init script, then generate a new format config file using those options.
    # Pretend we were invoked by systemd for that, since the new init script
    # will itself add the needed options which that would omit.
    (
      SEEDD_ARGS="-k"
      . "$oldconf"
      [ -z "$CONTROL_GROUP" ] || SEEDD_ARGS="$SEEDD_ARGS --socket-group $CONTROL_GROUP"

      export NOTIFY_SOCKET=@dummy

      cat > "$newconf" <<-EOF
	# These options were automatically migrated from $oldconf
	# during upgrade to the bit-babbler 0.8 (or later) release.
	#
	# A copy of the old file has been preserved in $saveconf
	# which can safely be deleted now after confirming that there is nothing
	# remaining in it which you do wish to retain a copy of.
	#
	# This file can safely be edited to customise the seedd configuration, it will
	# not be automatically (re)generated again after the initial conversion of the
	# old configuration file has created it.

	EOF

      if /usr/bin/seedd --gen-conf $SEEDD_ARGS >> "$newconf" 2>/dev/null; then
	# Preserve a copy of their old config.  We migrated anything which was
	# actively being used by the old init script, but there may be comments
	# or commented out configurations, or other things which it would be a
	# bit rude of us to just completely delete without asking.
	cat - "$oldconf" > "$saveconf" <<-EOF
		# NOTE: This file contains the last content from $oldconf
		#       prior to it being converted into the new $newconf
		#
		#       It may safely be deleted if there is nothing else in it which you wish
		#       to retain.  The seedd configuration uses options from the new file now
		#       and there is nothing which still uses anything from the old one at all.

	EOF

	rm -f "$oldconf"
	echo "Automatically migrated $oldconf configuration to $newconf"
	echo "The previous configuration file was saved to $saveconf"
      fi
    )
}

migrate_sysctl_conf()
{
    local oldconf='/etc/sysctl.d/bit-babbler-sysctl.conf'
    local keepconf="${oldconf}.dpkg-backup"
    local killconf="${oldconf}.dpkg-remove"

    if [ -e "$keepconf" ]; then

	echo "Preserving modified $oldconf as a local override."
	echo "The package supplied configuration is now in /usr/lib/sysctl.d instead."
	mv -f "$keepconf" "$oldconf"

    elif [ -e "$killconf" ]; then

	echo "Moved unmodified $oldconf to /usr/lib/sysctl.d"
	rm -f "$killconf"
    fi
}

case "$1" in
    configure)
	addgroup --quiet --system bit-babbler

	# Version 0.8 adds /etc/bit-babbler/seedd.conf, replacing the previous
	# daemon configuration options which were set in /etc/default/seedd.
	dpkg --compare-versions -- "$2" ge-nl '0.8~' || migrate_seedd_conf

	# Version 0.9 moves /etc/sysctl.d/bit-babbler-sysctl.conf to the
	# /usr/lib/sysctl.d directory, but we need to preserve the one in
	# /etc exactly as it is, as an override, if it was modified.
	dpkg --compare-versions -- "$2" ge-nl '0.9~' || migrate_sysctl_conf

	sysctl -q -p /usr/lib/sysctl.d/bit-babbler-sysctl.conf || true
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
	echo "postinst called with unknown argument \`$1'" >&2
	exit 1
    ;;
esac

# Automatically added by dh_systemd_enable/13.5.2
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# This will only remove masks created by d-s-h on package removal.
	deb-systemd-helper unmask 'seedd.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'seedd.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'seedd.service' >/dev/null || true
	else
		# Update the statefile to add new symlinks (if any), which need to be
		# cleaned up on purge. Also remove old symlinks.
		deb-systemd-helper update-state 'seedd.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable/13.5.2
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if deb-systemd-helper debian-installed 'seedd-wait.service'; then
		# This will only remove masks created by d-s-h on package removal.
		deb-systemd-helper unmask 'seedd-wait.service' >/dev/null || true

		if deb-systemd-helper --quiet was-enabled 'seedd-wait.service'; then
			# Create new symlinks, if any.
			deb-systemd-helper enable 'seedd-wait.service' >/dev/null || true
		fi
	fi

	# Update the statefile to add new symlinks (if any), which need to be cleaned
	# up on purge. Also remove old symlinks.
	deb-systemd-helper update-state 'seedd-wait.service' >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit/13.5.2
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -z "${DPKG_ROOT:-}" ] && [ -x "/etc/init.d/seedd" ]; then
		update-rc.d seedd defaults >/dev/null
		invoke-rc.d seedd restart || exit 1
	fi
fi
# End automatically added section


exit 0

# vi:sts=4:sw=4:noet