#!/bin/sh
# preinst script for open-iscsi

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

case "$1" in
    install|upgrade)
        # Determine if we have any iSCSI sessions that are in a failed
        # state. If so, upgrading iSCSI is dangerous, so ask the user
        # if they really want to do it. But before prompting, retry a
        # few times, just in case we hit a bad moment where a TCP
        # connection was being reestablished.
        RETRIES=0
        while cat /sys/class/iscsi_session/session*/state 2>/dev/null | grep -qv LOGGED_IN ; do
            if [ $RETRIES -gt 5 ]; then
                db_reset open-iscsi/upgrade_even_with_failed_sessions || true
                db_input critical open-iscsi/upgrade_even_with_failed_sessions || true
                db_go
                db_get open-iscsi/upgrade_even_with_failed_sessions
                if [ "$RET" = "false" ] ; then
                    echo "Aborting preinst due to user request." >&2
                    exit 1
                fi
                break
            fi

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

    abort-upgrade)
    ;;

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

if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" le-nl "2.0.873+git0.3b4b4500-12" ; then
    # /etc/iscsi/initiatorname.iscsi is no longer a conffile, so we rename it
    # to .dpkg-backup so that dpkg will not mark it as an obsolete conffile
    # on upgrading (which could cause some administrators to accidentally
    # remove the file even though they need it while removing obsolete
    # conffiles) - and then in postinst we will rename it back to
    # initiatorname.iscsi.
    if [ -f /etc/iscsi/initiatorname.iscsi ] ; then
        mv -f /etc/iscsi/initiatorname.iscsi /etc/iscsi/initiatorname.iscsi.dpkg-backup
    fi
fi



exit 0