#!/bin/sh
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <new-preinst> `install'
#        * <new-preinst> `install' <old-version>
#        * <new-preinst> `upgrade' <old-version>
#        * <old-preinst> `abort-upgrade' <new-version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package


case "$1" in
    install|upgrade)
        for cmd in halt poweroff reboot shutdown coldreboot ; do
            # DEP17 M18 duplicated diversion. Once trixie is released,
            # remove the aliased diversion in postinst and only have
            # the canonical one with --rename here.
            truename="$(dpkg-divert --truename "/sbin/$cmd")"
            if test "$(dpkg-divert --truename "/usr/sbin/$cmd")" != "/usr/sbin/$cmd"; then
                : # Canonically diverted already. Nothing to rename.
            elif test "$truenam" = "/sbin/$cmd.no-molly-guard.usr-is-merged"; then
                : # Aliased diversion as expected. Nothing to rename.
            elif test "$truename" != "/sbin/$cmd"; then
                # Aliased diversion with earlier target. Fix target.
                dpkg-divert --remove --no-rename "/sbin/$cmd"
                if test -e "$DPKG_ROOT$truename" -o -h "$DPKG_ROOT$truename"; then
                    mv "$DPKG_ROOT$truename" "$DPKG_ROOT/sbin/$cmd.no-molly-guard.usr-is-merged"
                fi
            elif dpkg -S "/sbin/$cmd" >/dev/null 2>&1; then
                # Not diverted yet. Installed as aliased.
                mv "$DPKG_ROOT/sbin/$cmd" "$DPKG_ROOT/sbin/$cmd.no-molly-guard.usr-is-merged"
            elif test -e "$DPKG_ROOT/usr/sbin/$cmd" -o -h "$DPKG_ROOT/usr/sbin/$cmd"; then
                # Not diverted yet. Installed as canonical.
                mv "$DPKG_ROOT/usr/sbin/$cmd" "$DPKG_ROOT/usr/sbin/$cmd.no-molly-guard"
            fi
            # All necessary moving has been done. Hence --no-rename.
            dpkg-divert --add --no-rename --divert "/sbin/$cmd.no-molly-guard.usr-is-merged" "/sbin/$cmd"
            dpkg-divert --add --no-rename --divert "/usr/sbin/$cmd.no-molly-guard" "/usr/sbin/$cmd"
        done

        for cmd in pm-hibernate pm-suspend pm-suspend-hybrid ; do
            truename="$(dpkg-divert --truename "/usr/sbin/$cmd")"
            if test "$truename" = "/usr/sbin/$cmd"; then
                dpkg-divert --package molly-guard --divert "/usr/sbin/$cmd.no-molly-guard" --rename "/usr/sbin/$cmd"
            elif test "$truename" != "/usr/sbin/$cmd.no-molly-guard"; then
                # Upgrading from pre-trixie. Update the diversion target from aliased to canonical.
                dpkg-divert --package molly-guard --no-rename --remove "/usr/sbin/$cmd"
                dpkg-divert --package molly-guard --divert "/usr/sbin/$cmd.no-molly-guard" --no-rename --add "/usr/sbin/$cmd"
                if test -e "$truename" -o -h "$truename"; then
                     mv "$truename" "/usr/sbin/$cmd.no-molly-guard"
                fi
            fi
        done
    ;;

    abort-upgrade)
    ;;

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

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



exit 0