#!/bin/sh

set -e

STATE="$1"
FILES="$2"

tmp_dest_dir="$FILES"/tmp/dest_dir
dest_dir_file="$FILES"/files/dest_dir
filename_file="$FILES"/files/filename
permissions_file="$FILES"/files/permissions

case "$STATE" in

    NeedsArtifactReboot)
        echo "No"
        ;;

    SupportsRollback)
        echo "Yes"
        ;;

    ArtifactInstall)
        dest_dir=$(cat "${dest_dir_file}")
        filename=$(cat "${filename_file}")
        test -z "$dest_dir" -o -z "$filename" && \
            echo "Fatal error: dest_dir or filename are undefined." && exit 1
        mkdir -p "${dest_dir}"
        mkdir -p "${tmp_dest_dir}"
        if test -f "${dest_dir}/${filename}"
        then
            if ! cp -a "${dest_dir}/${filename}" "${tmp_dest_dir}"
            then
                ret=$?
                # Make sure there is no half-backup lying around.
                rm -rf "${tmp_dest_dir}"
                exit $ret
            fi
        fi
        cp "$FILES"/files/"${filename}" "${dest_dir}/${filename}"
        # Previous revisions of this update module did not use the
        # permissions_file, so it might not exist.
        if test -f "${permissions_file}"
        then
            mode=$(cat "${permissions_file}")
            chmod "${mode}" "${dest_dir}/${filename}"
        fi
        ;;

    ArtifactRollback)
        filename=$(cat "${filename_file}")
        test -f "${tmp_dest_dir}/${filename}" || exit 0
        dest_dir=$(cat "${dest_dir_file}")
        test -z "$dest_dir" -o -z "$filename" && \
            echo "Fatal error: dest_dir or filename are undefined." && exit 1
        rm "${dest_dir}/${filename}"
        cp -a "${tmp_dest_dir}/${filename}" "${dest_dir}/${filename}"
        ;;
esac

exit 0

