#!/bin/sh

. /usr/share/debconf/confmodule
set -e

restore_old_timeouts()
{
    if [ -s /run/open-iscsi/upgrade/restore_old_timeouts ] ; then
        sh /run/open-iscsi/upgrade/restore_old_timeouts || :
    fi
    rm -f /run/open-iscsi/upgrade/restore_old_timeouts
    [ ! -d /run/open-iscsi/upgrade ] || rmdir --ignore-fail-on-non-empty /run/open-iscsi/upgrade
    [ ! -d /run/open-iscsi ] || rmdir --ignore-fail-on-non-empty /run/open-iscsi
}

case "$1" in
    configure)
        # We switched over to modules-load.d logic, so we have to take
        # care of this in postinst now.
        MODULES_FILE=/lib/modules-load.d/open-iscsi.conf
        if [ -f /etc/modules-load.d/open-iscsi.conf ] ; then
            MODULES_FILE=/etc/modules-load.d/open-iscsi.conf
        fi
        grep '^[^#]' $MODULES_FILE | while read module args ; do
            [ "$module" ] || continue
            modprobe $module $args >/dev/null 2>&1 || true
        done

	# Move old configuration from /etc/ into /etc/iscsi/
	# But only if configuration in /etc/iscsi is untouched
	# (FIXME: should this be removed? this is ancient and was
	# already in Squeeze's postinst - and we don't really need to
	# support direct upgrades from Lenny (5) to Stretch (9).)
	
        if [ -f /etc/initiatorname.iscsi ] ; then
            if grep -q "^GenerateName=yes" /etc/iscsi/initiatorname.iscsi ; then
                mv /etc/initiatorname.iscsi /etc/iscsi/initiatorname.iscsi
		chmod 600 /etc/iscsi/initiatorname.iscsi
	    fi
	fi

	if dpkg --compare-versions "$2" le-nl "2.0.873+git0.3b4b4500-12" ; then
	    # Handle the fact that /etc/iscsi/initiatorname.iscsi is no longer
	    # a conffile of this package but we want to keep it.
	    if [ -f /etc/iscsi/initiatorname.iscsi.dpkg-backup ] && ! [ -f /etc/iscsi/initiatorname.iscsi ] ; then
		mv -f /etc/iscsi/initiatorname.iscsi.dpkg-backup /etc/iscsi/initiatorname.iscsi
	    fi
	fi

	# Compatibility symlinks
	for file in iscsid iscsi_discovery iscsi-iname iscsistart; do
		if [ ! -e /usr/sbin/$file ]; then
			ln -s /sbin/$file /usr/sbin/$file
		fi
	done

	# Obsolete: only open-iscsi 1.0, never even shipped with any
	# stable Debian release. But postinst up to Jessie still
	# created this directory, so keep this until at least Stretch.
	if [ -d /var/lib/open-iscsi ]; then
		rmdir --ignore-fail-on-non-empty /var/lib/open-iscsi
	fi

        # generate a unique iSCSI InitiatorName
        NAMEFILE=/etc/iscsi/initiatorname.iscsi
        if [ ! -e $NAMEFILE ] && [ -z "$2" ] ; then
            # Generate a unique InitiatorName and save it
            INAME=$(iscsi-iname -p iqn.1993-08.org.debian:01)
            if [ -n "$INAME" ] ; then
                echo "## DO NOT EDIT OR REMOVE THIS FILE!" > $NAMEFILE
                echo "## If you remove this file, the iSCSI daemon will not start." >> $NAMEFILE
                echo "## If you change the InitiatorName, existing access control lists" >> $NAMEFILE
                echo "## may reject this initiator.  The InitiatorName must be unique">> $NAMEFILE
                echo "## for each iSCSI initiator.  Do NOT duplicate iSCSI InitiatorNames." >> $NAMEFILE
                printf "InitiatorName=%s\n" "$INAME" >> $NAMEFILE
                chmod 600 $NAMEFILE
            else
                echo "Error: failed to generate an iSCSI InitiatorName, driver cannot start."
                echo
                exit 1;
            fi
        fi
    ;;

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

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

# Automatically added by dh_systemd_enable/12.10ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if deb-systemd-helper debian-installed 'iscsid.service'; then
		# This will only remove masks created by d-s-h on package removal.
		deb-systemd-helper unmask 'iscsid.service' >/dev/null || true

		if deb-systemd-helper --quiet was-enabled 'iscsid.service'; then
			# Create new symlinks, if any.
			deb-systemd-helper enable 'iscsid.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 'iscsid.service' >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_enable/12.10ubuntu1
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 'iscsid.socket' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'iscsid.socket'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'iscsid.socket' >/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 'iscsid.socket' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable/12.10ubuntu1
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 'iscsid.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'iscsid.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'iscsid.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 'iscsid.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable/12.10ubuntu1
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 'iscsid.socket' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'iscsid.socket'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'iscsid.socket' >/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 'iscsid.socket' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable/12.10ubuntu1
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 'open-iscsi.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'open-iscsi.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'open-iscsi.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 'open-iscsi.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installdeb/12.10ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init.d/umountiscsi.sh 2.0.873+git0.3b4b4500-9 -- "$@"
# End automatically added section
# Automatically added by dh_installinit/12.10ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -x "/etc/init.d/iscsid" ]; then
		update-rc.d iscsid defaults >/dev/null || exit 1
	fi
fi
# End automatically added section
# Automatically added by dh_installinit/12.10ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	if [ -x "/etc/init.d/open-iscsi" ]; then
		update-rc.d open-iscsi defaults >/dev/null || exit 1
	fi
fi
# End automatically added section


if [ "$1" = configure ] && [ -n "$2" ] && [ -d /run/systemd/system ] && systemctl is-active iscsid.service > /dev/null; then
    # There already is a check in preinst with a debconf prompt that
    # allows the administrator to abort. Don't abort here, because
    # leaving the package in a half-configured state is probably worse.
    # Just make sure to wait a while to see if recovery happens. If
    # not, proceed anyway.
    RETRIES=0
    while cat /sys/class/iscsi_session/session*/state 2>/dev/null | grep -qv LOGGED_IN ; do
        if [ $RETRIES -eq 0 ] ; then
            echo "open-iscsi postinst: since the check in preinst some iSCSI sessions have" >&2
            echo "                     failed. -> will wait 30s for automatic recovery" >&2
        fi
        if [ $RETRIES -gt 30 ]; then
            echo "open-iscsi postinst: some sessions are still in failed state -> iscsid" >&2
            echo "                     will be restarted regardless, since that may" >&2
            echo "                     actually help with the session recovery." >&2
            break
        fi
        RETRIES=$((RETRIES + 1))
        sleep 1
    done

    # Before we restart iscsid, we should increase the recovery timeout
    # significantly. Thanks to Mike Christie (open-iscsi upstream) for
    # the suggestion. But store the old timeouts and restore them
    # later.
    new_timeout=120
    mkdir -m 0700 -p /run/open-iscsi/upgrade
    rm -f /run/open-iscsi/upgrade/restore_old_timeouts
    trap restore_old_timeouts EXIT
    for settingfile in /sys/class/iscsi_session/session*/recovery_tmo ; do
        [ -f "${settingfile}" ] || continue
        setting="$(cat "$settingfile" 2>/dev/null || :)"
        if [ -n "$setting" ] ; then
            echo "echo "'"'"${setting}"'"'" > "'"'"${settingfile}"'" 2>/dev/null' >> /run/open-iscsi/upgrade/restore_old_timeouts
        fi
        if [ ${new_timeout} -gt ${setting} ] ; then
            echo ${new_timeout} > "${settingfile}" 2>/dev/null
        fi
    done

    # Just in case something goes wrong:
    sync

    # we want to be able to be explcit to start .service, but follow policy.d therefore use deb-systemd-invoke
    deb-systemd-invoke restart iscsid.service || true

    RETRIES=0
    while cat /sys/class/iscsi_session/session*/state 2>/dev/null | grep -qv LOGGED_IN ; do
        if [ $RETRIES -eq 0 ]; then
            echo "open-iscsi postinst: after iscsid restart, waiting for iSCSI sessions" >&2
            echo "                     to recover. This may take a couple of seconds." >&2
        fi

        if [ $RETRIES -gt ${new_timeout} ]; then
            db_reset open-iscsi/upgrade_recovery_error || true
            db_input critical open-iscsi/upgrade_recovery_error || true
            db_go
            break
        fi

        RETRIES=$((RETRIES + 1))
        sleep 1
    done

    restore_old_timeouts
    trap - EXIT

    # Don't restart (and therefore stop) open-iscsi, because we don't
    # want to logout from targets during a simple upgrade. But also,
    # if for some reason there's some misconfigured target in the
    # config that couldn't be activated, don't break postinst, so
    # ignore the exit code.
    # See above for why 3>&- is here. (Technically it's not required
    # for postinst to work, but vgchange likes to complain about leaked
    # file descriptors, and we don't need to show that message to the
    # user.)
    invoke-rc.d open-iscsi start 3>&- || true
fi

if [ "$1" = configure ]; then
    # With socket based activation one wants iscsid.socket to be active
    # But on upgrades the iscsid.service might already be active
    # Due to that directly starting iscsid.socket might fail:
    #   systemd[1]: iscsid.socket: Socket service iscsid.service already active, refusing.
    # Therefore check if iscsid.service is:
    # - active:
    #    - ok for now, do not start iscsid.socket as it would conflict
    #    - on a reboot .socket will be started as it is enabled
    # - inactive:
    #    - start iscsid.socket - to be ready
    # In both cases:
    #    - disable iscsid.service so it only starts by the socket after reboot
    if [ -d /run/systemd/system ]; then
        if ! systemctl is-active iscsid.service > /dev/null; then
            deb-systemd-invoke start iscsid.socket || true
        fi
    fi
    if dpkg --compare-versions "$2" le-nl "2.0.874-5ubuntu3"; then
        deb-systemd-helper disable 'iscsid.service' >/dev/null || true
    fi
fi

exit 0