#!/bin/sh

set -e

# summary of how this script can be called:
#
#   * <postrm> `remove'
#   * <postrm> `purge'
#   * <old-postrm> `upgrade' <new-version>
#   * <disappearer's-postrm> `disappear' <overwriter> <overwriter-version>
#   * <new-postrm> `failed-upgrade' <old-version> <new-version>
#   * <new-postrm> `abort-install'
#   * <new-postrm> `abort-install' <old-version> <new-version>
#   * <new-postrm> `abort-upgrade' <old-version> <new-version>
#
# for details, see https://www.debian.org/doc/debian-policy/ or
# the debian-policy package

abort_conffile_transfer() {
    local conffile="$1"
    local lastver="$2"
    local pkgfrom="$3"
    local pkgto="$4"

    if [ "$5" != "--" ]; then
        echo "abort_conffile_transfer called with the wrong number of arguments" >&2
        return 1
    fi
    for _ in $(seq 1 5); do
        shift
    done

    # If we were installing from scratch or upgrading from a new enough version
    # when the error occurred, then no transfer was in progress and we don't
    # need to rollback any changes
    if [ -z "$2" ] || dpkg --compare-versions -- "$2" gt "$lastver"; then
        return 0
    fi

    # If the conffile was being transferred, return it to its original location
    if [ -e "$conffile.dpkg-transfer" ]; then
        mv -f "$conffile.dpkg-transfer" "$conffile"
    fi

    # Clean up additional state
    rm -f "$conffile.dpkg-disappear"
}

case "$1" in
    abort-install|abort-upgrade)
        abort_conffile_transfer \
            "/etc/libvirt/virt-login-shell.conf" \
            "6.9.0-2~" \
            "libvirt-clients" \
            "libvirt-login-shell" \
            -- \
            "$@"
    ;;

    remove|purge|upgrade|disappear|failed-upgrade)
    ;;

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



exit 0