#!/bin/sh
# Copyright 2024 Simon McVittie
# SPDX-License-Identifier: LGPL-2.1-or-later

set -e

# Clean up libgtk-3-0:*.postrm, so that when libgtk-3-0 is purged, it
# will not delete non-dpkg-managed files that have been taken over by
# libgtk-3-0t64, such as
# /usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/immodules.cache
# See https://bugs.debian.org/1065494, https://bugs.debian.org/1065170.
# TODO: When, if ever, can we safely remove this?
case "$1" in
    (install|upgrade)
        # Do this cleanup on upgrade from any version older than the one that
        # introduced this change.
        #
        # We also need to do this cleanup on new installations of
        # libgtk-3-0t64 (because any new installation might be replacing
        # libgtk-3-0) so treat an empty version as being arbitrarily old.
        if dpkg --compare-versions "${2:-}" lt "3.24.41-2"
        then
            if old_postrm=$(dpkg-query --control-path "libgtk-3-0:amd64" postrm 2>/dev/null) \
                && [ -n "$old_postrm" ] \
                && [ -e "$old_postrm" ]
            then
                echo "libgtk-3-0t64.preinst: Removing $old_postrm to avoid" \
                    "loss of /usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/immodules.cache..."
                rm -f -v "$old_postrm"
            fi
        fi
        ;;
esac



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