#!/usr/bin/env bash
#
# KeePassXC Release Preparation Helper
# Copyright (C) 2017 KeePassXC team <https://keepassxc.org/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 or (at your option)
# version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

printf "\e[1m\e[32mKeePassXC\e[0m Release Preparation Helper\n"
printf "Copyright (C) 2017 KeePassXC Team <https://keepassxc.org/>\n\n"


# -----------------------------------------------------------------------
#                        global default values
# -----------------------------------------------------------------------
RELEASE_NAME=""
APP_NAME="KeePassXC"
SRC_DIR="."
GPG_KEY="CFB4C2166397D0D2"
GPG_GIT_KEY=""
OUTPUT_DIR="release"
SOURCE_BRANCH=""
TARGET_BRANCH="master"
TAG_NAME=""
DOCKER_IMAGE=""
DOCKER_CONTAINER_NAME="keepassxc-build-container"
CMAKE_OPTIONS=""
CPACK_GENERATORS="WIX;ZIP"
COMPILER="g++"
MAKE_OPTIONS="-j8"
BUILD_PLUGINS="all"
INSTALL_PREFIX="/usr/local"
ORIG_BRANCH=""
ORIG_CWD="$(pwd)"

# -----------------------------------------------------------------------
#                          helper functions
# -----------------------------------------------------------------------
printUsage() {
    local cmd
    if [ "" == "$1" ] || [ "help" == "$1" ]; then
        cmd="COMMAND"
    elif [ "check" == "$1" ] || [ "merge" == "$1" ] || [ "build" == "$1" ] \
        || [ "gpgsign" == "$1" ] || [ "appsign" == "$1" ] || [ "appimage" == "$1" ]; then
        cmd="$1"
    else
        logError "Unknown command: '$1'\n"
        cmd="COMMAND"
    fi

    printf "\e[1mUsage:\e[0m $(basename $0) $cmd [options]\n"

    if [ "COMMAND" == "$cmd" ]; then
        cat << EOF

Commands:
  check      Perform a dry-run check, nothing is changed
  merge      Merge release branch into main branch and create release tags
  build      Build and package binary release from sources
  gpgsign    Sign previously compiled release packages with GPG
  appsign    Sign binaries with code signing certificates on Windows and macOS
  help       Show help for the given command
EOF
    elif [ "merge" == "$cmd" ]; then
        cat << EOF

Merge release branch into main branch and create release tags

Options:
  -v, --version        Release version number or name (required)
  -a, --app-name       Application name (default: '${APP_NAME}')
  -s, --source-dir     Source directory (default: '${SRC_DIR}')
  -k, --key            GPG key used to sign the merge commit and release tag,
                       leave empty to let Git choose your default key
                       (default: '${GPG_GIT_KEY}')
  -r, --release-branch Source release branch to merge from (default: 'release/VERSION')
      --target-branch  Target branch to merge to (default: '${TARGET_BRANCH}')
  -t, --tag-name       Override release tag name (defaults to version number)
  -h, --help           Show this help
EOF
    elif [ "build" == "$cmd" ]; then
        cat << EOF

Build and package binary release from sources

Options:
  -v, --version           Release version number or name (required)
  -a, --app-name          Application name (default: '${APP_NAME}')
  -s, --source-dir        Source directory (default: '${SRC_DIR}')
  -o, --output-dir        Output directory where to build the release
                          (default: '${OUTPUT_DIR}')
  -t, --tag-name          Release tag to check out (defaults to version number)
  -b, --build             Build sources after exporting release
  -d, --docker-image      Use the specified Docker image to compile the application.
                          The image must have all required build dependencies installed.
                          This option has no effect if --build is not set.
      --container-name    Docker container name (default: '${DOCKER_CONTAINER_NAME}')
                          The container must not exist already
      --snapcraft         Create and use docker image to build snapcraft distribution.
                          This option has no effect if --docker-image is not set.
      --appimage          Build a Linux AppImage after compilation.
                          If this option is set, --install-prefix has no effect
      --appsign           Perform platform specific App Signing before packaging
  -k, --key               Specify the App Signing Key/Identity
  -c, --cmake-options     Additional CMake options for compiling the sources
      --compiler          Compiler to use (default: '${COMPILER}')
  -m, --make-options      Make options for compiling sources (default: '${MAKE_OPTIONS}')
  -g, --generators        Additional CPack generators (default: '${CPACK_GENERATORS}')
  -i, --install-prefix    Install prefix (default: '${INSTALL_PREFIX}')
  -p, --plugins           Space-separated list of plugins to build
                          (default: ${BUILD_PLUGINS})
      --snapshot          Don't checkout the release tag
  -n, --no-source-tarball Don't build source tarball
  -h, --help              Show this help
EOF
    elif [ "gpgsign" == "$cmd" ]; then
        cat << EOF

Sign previously compiled release packages with GPG

Options:
  -f, --files        Files to sign (required)
  -k, --key          GPG key used to sign the files (default: '${GPG_KEY}')
  -h, --help         Show this help
EOF
    elif [ "appsign" == "$cmd" ]; then
        cat << EOF

Sign binaries with code signing certificates on Windows and macOS

Options:
  -f, --files        Files to sign (required)
  -k, --key          Signing Key or Apple Developer ID
  -h, --help         Show this help
EOF
    elif [ "appimage" == "$cmd" ]; then
        cat << EOF

Generate Linux AppImage from 'make install' AppDir

Options:
  -a, --appdir         Input AppDir (required)
  -v, --version        KeePassXC version
  -o, --output-dir     Output directory where to build the AppImage
                       (default: '${OUTPUT_DIR}')
  -d, --docker-image   Use the specified Docker image to build the AppImage.
                       The image must have all required build dependencies installed.
      --container-name Docker container name (default: '${DOCKER_CONTAINER_NAME}')
                       The container must not exist already
      --appsign        Embed a PGP signature into the AppImage
  -k, --key            The PGP Signing Key
      --verbosity      linuxdeploy verbosity (default: 3)
  -h, --help           Show this help
EOF
    fi
}

logInfo() {
    printf "\e[1m[ \e[34mINFO\e[39m ]\e[0m $1\n"
}

logError() {
    printf "\e[1m[ \e[31mERROR\e[39m ]\e[0m $1\n" >&2
}

init() {
    if [ "" == "$RELEASE_NAME" ]; then
        logError "Missing arguments, --version is required!\n"
        printUsage "check"
        exit 1
    fi

    if [ "" == "$TAG_NAME" ]; then
        TAG_NAME="$RELEASE_NAME"
    fi

    if [ "" == "$SOURCE_BRANCH" ]; then
        SOURCE_BRANCH="release/${RELEASE_NAME}"
    fi

    ORIG_CWD="$(pwd)"
    SRC_DIR="$(realpath "$SRC_DIR")"
    cd "$SRC_DIR" > /dev/null 2>&1
    ORIG_BRANCH="$(git rev-parse --abbrev-ref HEAD 2> /dev/null)"
    cd "$ORIG_CWD"
}

cleanup() {
    logInfo "Checking out original branch..."
    if [ "" != "$ORIG_BRANCH" ]; then
        git checkout "$ORIG_BRANCH" > /dev/null 2>&1
    fi
    logInfo "Leaving source directory..."
    cd "$ORIG_CWD"
}

exitError() {
    logError "$1"
    cleanup
    exit 1
}

exitTrap() {
    exitError "Existing upon user request..."
}

cmdExists() {
    command -v "$1" &> /dev/null
}

checkSourceDirExists() {
    if [ ! -d "$SRC_DIR" ]; then
        exitError "Source directory '${SRC_DIR}' does not exist!"
    fi
}

checkOutputDirDoesNotExist() {
    if [ -e "$OUTPUT_DIR" ]; then
        exitError "Output directory '$OUTPUT_DIR' already exists. Please choose a different location!"
    fi
}

checkGitRepository() {
    if [ ! -d .git ] || [ ! -f CHANGELOG ]; then
        exitError "Source directory is not a valid Git repository!"
    fi
}

checkReleaseDoesNotExist() {
    git tag | grep -q "^$TAG_NAME$"
    if [ $? -eq 0 ]; then
        exitError "Release '$RELEASE_NAME' (tag: '$TAG_NAME') already exists!"
    fi
}

checkWorkingTreeClean() {
    git diff-index --quiet HEAD --
    if [ $? -ne 0 ]; then
        exitError "Current working tree is not clean! Please commit or unstage any changes."
    fi
}

checkSourceBranchExists() {
    git rev-parse "$SOURCE_BRANCH" > /dev/null 2>&1
    if [ $? -ne 0 ]; then
        exitError "Source branch '$SOURCE_BRANCH' does not exist!"
    fi
}

checkTargetBranchExists() {
    git rev-parse "$TARGET_BRANCH" > /dev/null 2>&1
    if [ $? -ne 0 ]; then
        exitError "Target branch '$TARGET_BRANCH' does not exist!"
    fi
}

checkVersionInCMake() {
    local app_name_upper="$(echo "$APP_NAME" | tr '[:lower:]' '[:upper:]')"
    local major_num="$(echo ${RELEASE_NAME} | cut -f1 -d.)"
    local minor_num="$(echo ${RELEASE_NAME} | cut -f2 -d.)"
    local patch_num="$(echo ${RELEASE_NAME} | cut -f3 -d. | cut -f1 -d-)"

    grep -q "${app_name_upper}_VERSION_MAJOR \"${major_num}\"" CMakeLists.txt
    if [ $? -ne 0 ]; then
        exitError "${app_name_upper}_VERSION_MAJOR not updated to '${major_num}' in CMakeLists.txt!"
    fi

    grep -q "${app_name_upper}_VERSION_MINOR \"${minor_num}\"" CMakeLists.txt
    if [ $? -ne 0 ]; then
        exitError "${app_name_upper}_VERSION_MINOR not updated to '${minor_num}' in CMakeLists.txt!"
    fi

    grep -q "${app_name_upper}_VERSION_PATCH \"${patch_num}\"" CMakeLists.txt
    if [ $? -ne 0 ]; then
        exitError "${app_name_upper}_VERSION_PATCH not updated to '${patch_num}' in CMakeLists.txt!"
    fi
}

checkChangeLog() {
    if [ ! -f CHANGELOG ]; then
        exitError "No CHANGELOG file found!"
    fi

    grep -qPzo "${RELEASE_NAME} \(\d{4}-\d{2}-\d{2}\)\n=+\n" CHANGELOG
    if [ $? -ne 0 ]; then
        exitError "'CHANGELOG' has not been updated to the '${RELEASE_NAME}' release!"
    fi
}

checkAppStreamInfo() {
    if [ ! -f share/linux/org.keepassxc.KeePassXC.appdata.xml ]; then
        exitError "No AppStream info file found!"
    fi

    grep -qPzo "<release version=\"${RELEASE_NAME}\" date=\"\d{4}-\d{2}-\d{2}\">" share/linux/org.keepassxc.KeePassXC.appdata.xml
    if [ $? -ne 0 ]; then
        exitError "'share/linux/org.keepassxc.KeePassXC.appdata.xml' has not been updated to the '${RELEASE_NAME}' release!"
    fi
}

checkSnapcraft() {
    if [ ! -f snapcraft.yaml ]; then
        echo "No snapcraft file found!"
        return
    fi

    grep -qPzo "version: ${RELEASE_NAME}" snapcraft.yaml
    if [ $? -ne 0 ]; then
        exitError "'snapcraft.yaml' has not been updated to the '${RELEASE_NAME}' release!"
    fi

    grep -qPzo "KEEPASSXC_BUILD_TYPE=Release" snapcraft.yaml
    if [ $? -ne 0 ]; then
        exitError "'snapcraft.yaml' is not set for a release build!"
    fi
}

checkTransifexCommandExists() {
    if ! cmdExists tx; then
        exitError "Transifex tool 'tx' not installed! Please install it using 'pip install transifex-client'."
    fi
}

checkSigntoolCommandExists() {
    if ! cmdExists signtool; then
        exitError "signtool command not found on the PATH! Add the Windows SDK binary folder to your PATH."
    fi
}

checkCodesignCommandExists() {
    if ! cmdExists codesign; then
        exitError "codesign command not found on the PATH! Please check that you have correctly installed Xcode."
    fi
}

checkQt5LUpdateExists() {
    if cmdExists lupdate && ! $(lupdate -version | grep -q "lupdate version 5\."); then
        if ! cmdExists lupdate-qt5; then
            exitError "Qt Linguist tool (lupdate-qt5) is not installed! Please install using 'apt install qttools5-dev-tools'"
        fi
    fi
}

performChecks() {
    logInfo "Performing basic checks..."

    checkSourceDirExists

    logInfo "Changing to source directory..."
    cd "${SRC_DIR}"

    logInfo "Validating toolset and repository..."

    checkTransifexCommandExists
    checkQt5LUpdateExists
    checkGitRepository
    checkReleaseDoesNotExist
    checkWorkingTreeClean
    checkSourceBranchExists
    checkTargetBranchExists

    logInfo "Checking out '${SOURCE_BRANCH}'..."
    git checkout "$SOURCE_BRANCH"

    logInfo "Attempting to find '${RELEASE_NAME}' in various files..."

    checkVersionInCMake
    checkChangeLog
    checkAppStreamInfo
    checkSnapcraft

    logInfo "\e[1m\e[32mAll checks passed!\e[0m"
}

# re-implement realpath for OS X (thanks mschrag)
# https://superuser.com/questions/205127/
if ! cmdExists realpath; then
    realpath() {
        pushd . > /dev/null
        if [ -d "$1" ]; then
            cd "$1"
            dirs -l +0
        else
            cd "$(dirname "$1")"
            cur_dir=$(dirs -l +0)

            if [ "$cur_dir" == "/" ]; then
                echo "$cur_dir$(basename "$1")"
            else
                echo "$cur_dir/$(basename "$1")"
            fi
        fi
        popd > /dev/null
    }
fi


trap exitTrap SIGINT SIGTERM

# -----------------------------------------------------------------------
#                             check command
# -----------------------------------------------------------------------
check() {
    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -v|--version)
                RELEASE_NAME="$2"
                shift ;;
        esac
        shift
    done

    init

    performChecks

    cleanup

    logInfo "Congrats! You can successfully merge, build, and sign KeepassXC."
}

# -----------------------------------------------------------------------
#                             merge command
# -----------------------------------------------------------------------
merge() {
    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -v|--version)
                RELEASE_NAME="$2"
                shift ;;

            -a|--app-name)
                APP_NAME="$2"
                shift ;;

            -s|--source-dir)
                SRC_DIR="$2"
                shift ;;

            -k|--key|-g|--gpg-key)
                GPG_GIT_KEY="$2"
                shift ;;

            -r|--release-branch)
                SOURCE_BRANCH="$2"
                shift ;;

            --target-branch)
                TARGET_BRANCH="$2"
                shift ;;

            -t|--tag-name)
                TAG_NAME="$2"
                shift ;;

            -h|--help)
                printUsage "merge"
                exit ;;

            *)
                logError "Unknown option '$arg'\n"
                printUsage "merge"
                exit 1 ;;
        esac
        shift
    done

    init

    performChecks

    logInfo "Updating language files..."
    ./share/translations/update.sh update
    ./share/translations/update.sh pull
    if [ 0 -ne $? ]; then
        exitError "Updating translations failed!"
    fi
    git diff-index --quiet HEAD --
    if [ $? -ne 0 ]; then
        git add ./share/translations/*
        logInfo "Committing changes..."
        if [ "" == "$GPG_GIT_KEY" ]; then
            git commit -m "Update translations"
        else
            git commit -m "Update translations" -S"$GPG_GIT_KEY"
        fi
    fi

    CHANGELOG=$(grep -Pzo "(?<=${RELEASE_NAME} \(\d{4}-\d{2}-\d{2}\)\n)=+\n\n?(?:.|\n)+?\n(?=\n)" \
        CHANGELOG | grep -Pzo '(?<=\n\n)(.|\n)+' | tr -d \\0)
    COMMIT_MSG="Release ${RELEASE_NAME}"

    logInfo "Checking out target branch '${TARGET_BRANCH}'..."
    git checkout "$TARGET_BRANCH"

    logInfo "Merging '${SOURCE_BRANCH}' into '${TARGET_BRANCH}'..."

    git merge "$SOURCE_BRANCH" --no-ff -m "$COMMIT_MSG" -m "${CHANGELOG}" "$SOURCE_BRANCH" -S"$GPG_GIT_KEY"

    logInfo "Creating tag '${TAG_NAME}'..."
    if [ "" == "$GPG_GIT_KEY" ]; then
        git tag -a "$TAG_NAME" -m "$COMMIT_MSG" -m "${CHANGELOG}" -s
    else
        git tag -a "$TAG_NAME" -m "$COMMIT_MSG" -m "${CHANGELOG}" -s -u "$GPG_GIT_KEY"
    fi

    cleanup

    logInfo "All done!"
    logInfo "Please merge the release branch back into the develop branch now and then push your changes."
    logInfo "Don't forget to also push the tags using \e[1mgit push --tags\e[0m."
}

# -----------------------------------------------------------------------
#                         appimage command
# -----------------------------------------------------------------------
appimage() {
    local appdir
    local build_appsign=false
    local build_key
    local verbosity="1"

    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -v|--version)
                RELEASE_NAME="$2"
                shift ;;

            -a|--appdir)
                appdir="$2"
                shift ;;

            -o|--output-dir)
                OUTPUT_DIR="$2"
                shift ;;

            -d|--docker-image)
                DOCKER_IMAGE="$2"
                shift ;;

            --container-name)
                DOCKER_CONTAINER_NAME="$2"
                shift ;;

            --appsign)
                build_appsign=true ;;

            --verbosity)
                verbosity=$2
                shift ;;

            -k|--key)
                build_key="$2"
                shift ;;

            -h|--help)
                printUsage "appimage"
                exit ;;

            *)
                logError "Unknown option '$arg'\n"
                printUsage "appimage"
                exit 1 ;;
        esac
        shift
    done

    if [ -z "${appdir}" ]; then
        logError "Missing arguments, --appdir is required!\n"
        printUsage "appimage"
        exit 1
    fi

    if [ ! -d "${appdir}" ]; then
        logError "AppDir does not exist, please create one with 'make install'!\n"
        exit 1
    elif [ -e "${appdir}/AppRun" ]; then
        logError "AppDir has already been run through linuxdeploy, please create a fresh AppDir with 'make install'.\n"
        exit 1
    fi

    appdir="$(realpath "$appdir")"

    local out="${OUTPUT_DIR}"
    if [ "" == "$out" ]; then
        out="."
    fi
    mkdir -p "$out"
    local out_real="$(realpath "$out")"
    cd "$out"

    local linuxdeploy="linuxdeploy"
    local linuxdeploy_cleanup
    local linuxdeploy_plugin_qt="linuxdeploy-plugin-qt"
    local linuxdeploy_plugin_qt_cleanup
    local appimagetool="appimagetool"
    local appimagetool_cleanup

    logInfo "Testing for AppImage tools..."
    local docker_test_cmd
    if [ "" != "$DOCKER_IMAGE" ]; then
        docker_test_cmd="docker run --rm ${DOCKER_IMAGE}"
    fi

    # Test if linuxdeploy and linuxdeploy-plugin-qt are installed
    # on the system or inside the Docker container
    if ! ${docker_test_cmd} which ${linuxdeploy} &> /dev/null; then
        logInfo "Downloading linuxdeploy..."
        linuxdeploy="./linuxdeploy"
        linuxdeploy_cleanup="rm -f ${linuxdeploy}"
        curl -L "https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage" > "$linuxdeploy"
        chmod +x "$linuxdeploy"
    fi
    if ! ${docker_test_cmd} which ${linuxdeploy_plugin_qt} &> /dev/null; then
        logInfo "Downloading linuxdeploy-plugin-qt..."
        linuxdeploy_plugin_qt="./linuxdeploy-plugin-qt"
        linuxdeploy_plugin_qt_cleanup="rm -f ${linuxdeploy_plugin_qt}"
        curl -L "https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage" > "$linuxdeploy_plugin_qt"
        chmod +x "$linuxdeploy_plugin_qt"
    fi

    # appimagetool is always run outside a Docker container, so we can access our GPG keys
    if ! cmdExists ${appimagetool}; then
        logInfo "Downloading appimagetool..."
        appimagetool="./appimagetool"
        appimagetool_cleanup="rm -f ${appimagetool}"
        curl -L "https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-x86_64.AppImage" > "$appimagetool"
        chmod +x "$appimagetool"
    fi

    # Create custom AppRun wrapper
    cat << EOF > "${out_real}/KeePassXC-AppRun"
#!/usr/bin/env bash

export PATH="\$(dirname \$0)/usr/bin:\${PATH}"
export LD_LIBRARY_PATH="\$(dirname \$0)/usr/lib:\${LD_LIBRARY_PATH}"

if [ "\${1}" == "cli" ]; then
    shift
    exec keepassxc-cli "\$@"
elif [ "\${1}" == "proxy" ]; then
    shift
    exec keepassxc-proxy "\$@"
elif [ -v CHROME_WRAPPER ] || [ -v MOZ_LAUNCHED_CHILD ]; then
    exec keepassxc-proxy "\$@"
else
    exec keepassxc "\$@"
fi
EOF
    chmod +x "${out_real}/KeePassXC-AppRun"

    # Find .desktop files, icons, and binaries to deploy
    local desktop_file="$(find "$appdir" -name "org.keepassxc.KeePassXC.desktop" | head -n1)"
    local icon="$(find "$appdir" -name 'keepassxc.png' | grep -P 'application/256x256/apps/keepassxc.png$' | head -n1)"
    local executables="$(IFS=$'\n' find "$appdir" | grep -P '/usr/bin/keepassxc[^/]*$' | xargs -i printf " --executable={}")"

    logInfo "Collecting libs and patching binaries..."
    if [ "" == "$DOCKER_IMAGE" ]; then
        "$linuxdeploy" --verbosity=${verbosity} --plugin=qt --appdir="$appdir" --desktop-file="$desktop_file" \
        --custom-apprun="${out_real}/KeePassXC-AppRun" --icon-file="$icon" ${executables} \
        --library=$(ldconfig -p | grep x86-64 | grep -oP '/[^\s]+/libgpg-error\.so\.\d+$' | head -n1)
    else
        desktop_file="${desktop_file//${appdir}/\/keepassxc\/AppDir}"
        icon="${icon//${appdir}/\/keepassxc\/AppDir}"
        executables="${executables//${appdir}/\/keepassxc\/AppDir}"

        docker run --name "$DOCKER_CONTAINER_NAME" --rm \
            --cap-add SYS_ADMIN --security-opt apparmor:unconfined --device /dev/fuse \
            -v "${appdir}:/keepassxc/AppDir:rw" \
            -v "${out_real}:/keepassxc/out:rw" \
            "$DOCKER_IMAGE" \
            bash -c "cd /keepassxc/out && ${linuxdeploy} --verbosity=${verbosity} --plugin=qt --appdir=/keepassxc/AppDir \
            --custom-apprun="/keepassxc/out/KeePassXC-AppRun" --desktop-file=${desktop_file} --icon-file=${icon} ${executables} \
            --library=\$(ldconfig -p | grep x86-64 | grep -oP '/[^\s]+/libgpg-error\.so\.\d+$' | head -n1)"
    fi

    logInfo "Creating AppImage..."
    local appsign_flag=""
    local appsign_key_flag=""
    if ${build_appsign}; then
        appsign_flag="--sign"
        appsign_key_flag="--sign-key ${build_key}"
    fi
    local appimage_name="KeePassXC-x86_64.AppImage"
    if [ "" != "$RELEASE_NAME" ]; then
        appimage_name="KeePassXC-${RELEASE_NAME}-x86_64.AppImage"
    fi

    # Run appimagetool to package (and possibly sign) AppImage
    # --no-appstream is required, since it may crash on newer systems
    # see: https://github.com/AppImage/AppImageKit/issues/856
    "$appimagetool" --updateinformation "gh-releases-zsync|keepassxreboot|keepassxc|latest|KeePassXC-*-x86_64.AppImage.zsync" \
        ${appsign_flag} ${appsign_key_flag} --no-appstream "$appdir" "${out_real}/${appimage_name}"

    logInfo "Cleaning up temporary files..."
    ${linuxdeploy_cleanup}
    ${linuxdeploy_plugin_qt_cleanup}
    ${appimagetool_cleanup}
    rm -f "${out_real}/KeePassXC-AppRun"
}

# -----------------------------------------------------------------------
#                             build command
# -----------------------------------------------------------------------
build() {
    local build_source_tarball=true
    local build_snapshot=false
    local build_snapcraft=false
    local build_appimage=false
    local build_generators=""
    local build_appsign=false
    local build_key=""

    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -v|--version)
                RELEASE_NAME="$2"
                shift ;;

            -a|--app-name)
                APP_NAME="$2"
                shift ;;

            -s|--source-dir)
                SRC_DIR="$2"
                shift ;;

            -o|--output-dir)
                OUTPUT_DIR="$2"
                shift ;;

            -t|--tag-name)
                TAG_NAME="$2"
                shift ;;

            -d|--docker-image)
                DOCKER_IMAGE="$2"
                shift ;;

            --container-name)
                DOCKER_CONTAINER_NAME="$2"
                shift ;;

            --appsign)
                build_appsign=true ;;

            -k|--key)
                build_key="$2"
                shift ;;

            --snapcraft)
                build_snapcraft=true ;;

            --appimage)
                build_appimage=true ;;

            -c|--cmake-options)
                CMAKE_OPTIONS="$2"
                shift ;;

            --compiler)
                COMPILER="$2"
                shift ;;

            -m|--make-options)
                MAKE_OPTIONS="$2"
                shift ;;

            -g|--generators)
                build_generators="$2"
                shift ;;

            -i|--install-prefix)
                INSTALL_PREFIX="$2"
                shift ;;

            -p|--plugins)
                BUILD_PLUGINS="$2"
                shift ;;

            -n|--no-source-tarball)
                build_source_tarball=false ;;

            --snapshot)
                build_snapshot=true ;;

            -h|--help)
                printUsage "build"
                exit ;;

            *)
                logError "Unknown option '$arg'\n"
                printUsage "build"
                exit 1 ;;
        esac
        shift
    done

    if [[ ${build_appsign} && ! -f ${build_key} ]]; then
        exitError "--appsign specified with invalid key file\n"
    fi

    init

    OUTPUT_DIR="$(realpath "$OUTPUT_DIR")"

    if ${build_snapshot}; then
        TAG_NAME="HEAD"
        local branch=`git rev-parse --abbrev-ref HEAD`
        logInfo "Using current branch ${branch} to build..."
        RELEASE_NAME="${RELEASE_NAME}-snapshot"
        CMAKE_OPTIONS="${CMAKE_OPTIONS} -DKEEPASSXC_BUILD_TYPE=Snapshot"
    else
        checkWorkingTreeClean

        if $(echo "$TAG_NAME" | grep -qP "\-(alpha|beta)\\d+\$"); then
            CMAKE_OPTIONS="${CMAKE_OPTIONS} -DKEEPASSXC_BUILD_TYPE=PreRelease"
            logInfo "Checking out pre-release tag '${TAG_NAME}'..."
        else
            CMAKE_OPTIONS="${CMAKE_OPTIONS} -DKEEPASSXC_BUILD_TYPE=Release"
            logInfo "Checking out release tag '${TAG_NAME}'..."
        fi
        git checkout "$TAG_NAME"
    fi

    logInfo "Creating output directory..."
    mkdir -p "$OUTPUT_DIR"

    if [ $? -ne 0 ]; then
        exitError "Failed to create output directory!"
    fi

    if ${build_source_tarball}; then
        logInfo "Creating source tarball..."
        local app_name_lower="$(echo "$APP_NAME" | tr '[:upper:]' '[:lower:]')"
        local prefix="${app_name_lower}-${RELEASE_NAME}"
        local tarball_name="${prefix}-src.tar"

        git archive --format=tar "$TAG_NAME" --prefix="${prefix}/" --output="${OUTPUT_DIR}/${tarball_name}"

        if ! ${build_snapshot}; then
            # add .version file to tar
            mkdir "${prefix}"
            echo -n ${RELEASE_NAME} > "${prefix}/.version"
            tar --append --file="${OUTPUT_DIR}/${tarball_name}" "${prefix}/.version"
            rm "${prefix}/.version"
            rmdir "${prefix}" 2> /dev/null
        fi

        xz -6 "${OUTPUT_DIR}/${tarball_name}"
    fi

    if ! ${build_snapshot} && [ -e "${OUTPUT_DIR}/build-release" ]; then
        logInfo "Cleaning existing build directory..."
        rm -r "${OUTPUT_DIR}/build-release" 2> /dev/null
        if [ $? -ne 0 ]; then
            exitError "Failed to clean existing build directory, please do it manually."
        fi
    fi

    logInfo "Creating build directory..."
    mkdir -p "${OUTPUT_DIR}/build-release"
    cd "${OUTPUT_DIR}/build-release"

    logInfo "Configuring sources..."
    for p in ${BUILD_PLUGINS}; do
        CMAKE_OPTIONS="${CMAKE_OPTIONS} -DWITH_XC_$(echo $p | tr '[:lower:]' '[:upper:]')=On"
    done
    if [ "$(uname -o)" == "GNU/Linux" ] && ${build_appimage}; then
        CMAKE_OPTIONS="${CMAKE_OPTIONS} -DKEEPASSXC_DIST_TYPE=AppImage"
        # linuxdeploy requires /usr as install prefix
        INSTALL_PREFIX="/usr"
    fi

    if [ "$COMPILER" == "g++" ]; then
        export CC=gcc
    elif [ "$COMPILER" == "clang++" ]; then
        export CC=clang
    fi
    export CXX="$COMPILER"

    if [ "" == "$DOCKER_IMAGE" ]; then
        if [ "$(uname -s)" == "Darwin" ]; then
            # Building on macOS
            export MACOSX_DEPLOYMENT_TARGET=10.10

            logInfo "Configuring build..."
            cmake -DCMAKE_BUILD_TYPE=Release \
              -DCMAKE_OSX_ARCHITECTURES=x86_64 -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" \
              -DCMAKE_PREFIX_PATH="/usr/local/opt/qt/lib/cmake" \
              ${CMAKE_OPTIONS} "$SRC_DIR"

            logInfo "Compiling and packaging sources..."
            make ${MAKE_OPTIONS} package

            # Appsign the executables if desired
            if [[ ${build_appsign} ]]; then
                logInfo "Signing executable files"
                appsign "-f" "./${APP_NAME}-${RELEASE_NAME}.dmg" "-k" "${build_key}"
            fi

            mv "./${APP_NAME}-${RELEASE_NAME}.dmg" ../
        elif [ "$(uname -o)" == "Msys" ]; then
            # Building on Windows with Msys2
            logInfo "Configuring build..."
            cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=Off -G"MSYS Makefiles" \
                -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" ${CMAKE_OPTIONS} "$SRC_DIR"

            logInfo "Compiling and packaging sources..."
            mingw32-make ${MAKE_OPTIONS} preinstall

            # Appsign the executables if desired
            if [[ ${build_appsign} ]]; then
                logInfo "Signing executable files"
                appsign "-f" $(find src | grep -P '\.exe$|\.dll$') "-k" "${build_key}"
            fi

            # Call cpack directly instead of calling make package.
            # This is important because we want to build the MSI when making a
            # release.
            cpack -G "${CPACK_GENERATORS};${build_generators}"

            # Inject the portable config into the zip build and rename
            for filename in ${APP_NAME}-*.zip; do
                logInfo "Creating portable zip file"
                local folder=$(echo ${filename} | sed -r 's/(.*)\.zip/\1/')
                python -c 'import zipfile,sys ; zipfile.ZipFile(sys.argv[1],"a").write(sys.argv[2],sys.argv[3])' \
                    ${filename} ${SRC_DIR}/share/keepassxc.ini ${folder}/keepassxc.ini
                mv ${filename} ${folder}-portable.zip
            done

            mv "${APP_NAME}-"*.* ../
        else
            mkdir -p "${OUTPUT_DIR}/KeePassXC.AppDir"

            # Building on Linux without Docker container
            logInfo "Configuring build..."
            cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=Off ${CMAKE_OPTIONS} \
                -DCMAKE_INSTALL_PREFIX="${INSTALL_PREFIX}" "$SRC_DIR"

            logInfo "Compiling sources..."
            make ${MAKE_OPTIONS}

            logInfo "Installing to bin dir..."
            make DESTDIR="${OUTPUT_DIR}/KeePassXC.AppDir" install/strip
        fi
    else
        if ${build_snapcraft}; then
            logInfo "Building snapcraft docker image..."

            sudo docker image build -t "$DOCKER_IMAGE" "$(realpath "$SRC_DIR")/ci/snapcraft"

            logInfo "Launching Docker contain to compile snapcraft..."

            sudo docker run --name "$DOCKER_CONTAINER_NAME" --rm \
                -v "$(realpath "$SRC_DIR"):/keepassxc" -w "/keepassxc" \
                "$DOCKER_IMAGE" snapcraft
        else
            mkdir -p "${OUTPUT_DIR}/KeePassXC.AppDir"

            logInfo "Launching Docker container to compile sources..."

            docker run --name "$DOCKER_CONTAINER_NAME" --rm \
                --cap-add SYS_ADMIN --security-opt apparmor:unconfined --device /dev/fuse \
                -e "CC=${CC}" -e "CXX=${CXX}" \
                -v "$(realpath "$SRC_DIR"):/keepassxc/src:ro" \
                -v "$(realpath "$OUTPUT_DIR"):/keepassxc/out:rw" \
                "$DOCKER_IMAGE" \
                bash -c "cd /keepassxc/out/build-release && \
                    cmake -DCMAKE_BUILD_TYPE=Release -DWITH_TESTS=Off ${CMAKE_OPTIONS} \
                        -DCMAKE_INSTALL_PREFIX=${INSTALL_PREFIX} /keepassxc/src && \
                    make ${MAKE_OPTIONS} && make DESTDIR=/keepassxc/out/KeePassXC.AppDir install/strip"
        fi

        if [ 0 -ne $? ]; then
            exitError "Docker build failed!"
        fi

        logInfo "Build finished, Docker container terminated."
    fi

    if [ "$(uname -o)" == "GNU/Linux" ] && ${build_appimage}; then
        local appsign_flag=""
        local appsign_key_flag=""
        local docker_image_flag=""
        local docker_container_name_flag=""
        if ${build_appsign}; then
            appsign_flag="--appsign"
            appsign_key_flag="-k ${build_key}"
        fi
        if [ "" != "${DOCKER_IMAGE}" ]; then
            docker_image_flag="-d ${DOCKER_IMAGE}"
            docker_container_name_flag="--container-name ${DOCKER_CONTAINER_NAME}"
        fi
        appimage "-a" "${OUTPUT_DIR}/KeePassXC.AppDir" "-o" "${OUTPUT_DIR}" \
            ${appsign_flag} ${appsign_key_flag} ${docker_image_flag} ${docker_container_name_flag}
    fi

    cleanup

    logInfo "All done!"
}

# -----------------------------------------------------------------------
#                           gpgsign command
# -----------------------------------------------------------------------
gpgsign() {
    local sign_files=()

    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -f|--files)
                while [ "${2:0:1}" != "-" ] && [ $# -ge 2 ]; do
                    sign_files+=("$2")
                    shift
                done ;;

            -k|--key|-g|--gpg-key)
                GPG_KEY="$2"
                shift ;;

            -h|--help)
                printUsage "gpgsign"
                exit ;;

            *)
                logError "Unknown option '$arg'\n"
                printUsage "gpgsign"
                exit 1 ;;
        esac
        shift
    done

    if [ -z "${sign_files}" ]; then
        logError "Missing arguments, --files is required!\n"
        printUsage "gpgsign"
        exit 1
    fi

    for f in "${sign_files[@]}"; do
        if [ ! -f "$f" ]; then
            exitError "File '${f}' does not exist or is not a file!"
        fi

        logInfo "Signing file '${f}' using release key..."
        gpg --output "${f}.sig" --armor --local-user "$GPG_KEY" --detach-sig "$f"

        if [ 0 -ne $? ]; then
            exitError "Signing failed!"
        fi

        logInfo "Creating digest for file '${f}'..."
        local rp="$(realpath "$f")"
        local bname="$(basename "$f")"
        (cd "$(dirname "$rp")"; sha256sum "$bname"  > "${bname}.DIGEST")
    done

    logInfo "All done!"
}

# -----------------------------------------------------------------------
#                           appsign command
# -----------------------------------------------------------------------
appsign() {
    local sign_files=()
    local key

    while [ $# -ge 1 ]; do
        local arg="$1"
        case "$arg" in
            -f|--files)
                while [ "${2:0:1}" != "-" ] && [ $# -ge 2 ]; do
                    sign_files+=("$2")
                    shift
                done ;;

            -k|--key|-i|--identity)
                key="$2"
                shift ;;

            -h|--help)
                printUsage "appsign"
                exit ;;

            *)
                logError "Unknown option '$arg'\n"
                printUsage "appsign"
                exit 1 ;;
        esac
        shift
    done

    if [ -z "${key}" ]; then
        logError "Missing arguments, --key is required!\n"
        printUsage "appsign"
        exit 1
    fi

    if [ -z "${sign_files}" ]; then
        logError "Missing arguments, --files is required!\n"
        printUsage "appsign"
        exit 1
    fi

    for f in "${sign_files[@]}"; do
        if [ ! -f "${f}" ]; then
            exitError "File '${f}' does not exist or is not a file!"
        fi
    done

    if [ "$(uname -s)" == "Darwin" ]; then
        checkCodesignCommandExists

        local orig_dir="$(pwd)"
        for f in "${sign_files[@]}"; do
            if [[ ${f: -4} == '.dmg' ]]; then
                logInfo "Unpacking disk image '${f}'..."
                local tmp_dir="/tmp/KeePassXC_${RANDOM}"
                mkdir -p ${tmp_dir}/mnt
                hdiutil attach -quiet -noautoopen -mountpoint ${tmp_dir}/mnt "${f}"
                cd ${tmp_dir}
                cp -a ./mnt ./app
                hdiutil detach -quiet ${tmp_dir}/mnt

                if [ ! -d ./app/KeePassXC.app ]; then
                    cd "${orig_dir}"
                    exitError "Unpacking failed!"
                fi

                logInfo "Signing app using codesign..."
                codesign --sign "${key}" --verbose --deep --entitlements ${orig_dir}/share/macosx/keepassxc.entitlements ./app/KeePassXC.app

                if [ 0 -ne $? ]; then
                    cd "${orig_dir}"
                    exitError "Signing failed!"
                fi

                logInfo "Repacking disk image..."
                hdiutil create \
                    -volname "KeePassXC" \
                    -size $((1000 * ($(du -sk ./app | cut -f1) + 5000))) \
                    -srcfolder ./app \
                    -fs HFS+ \
                    -fsargs "-c c=64,a=16,e=16" \
                    -format UDBZ \
                    "${tmp_dir}/$(basename "${f}")"
                cd "${orig_dir}"
                cp -f "${tmp_dir}/$(basename "${f}")" "${f}"
                rm -Rf ${tmp_dir}
            else
                logInfo "Skipping non-DMG file '${f}'..."
            fi
        done

    elif [ "$(uname -o)" == "Msys" ]; then
        if [[ ! -f "${key}" ]]; then
            exitError "Key file was not found!"
        fi

        read -s -p "Key password: " password
        echo

        for f in "${sign_files[@]}"; do
            ext=${f: -4}
            if [[ $ext == ".msi" || $ext == ".exe" || $ext == ".dll" ]]; then
                # Make sure we can find the signtool
                checkSigntoolCommandExists

                # osslsigncode does not succeed at signing MSI files at this time...
                logInfo "Signing file '${f}' using Microsoft signtool..."
                signtool sign -f "${key}" -p "${password}" -d "KeePassXC" \
                    -t "http://timestamp.comodoca.com/authenticode" "${f}"

                if [ 0 -ne $? ]; then
                    exitError "Signing failed!"
                fi
            else
                logInfo "Skipping non-executable file '${f}'..."
            fi
        done

    else
        exitError "Unsupported platform for code signing!\n"
    fi

    logInfo "All done!"
}

# -----------------------------------------------------------------------
#                       parse global command line
# -----------------------------------------------------------------------
MODE="$1"
shift
if [ "" == "$MODE" ]; then
    logError "Missing arguments!\n"
    printUsage
    exit 1
elif [ "help" == "$MODE" ]; then
    printUsage "$1"
    exit
elif [ "check" == "$MODE" ] || [ "merge" == "$MODE" ] || [ "build" == "$MODE" ] \
    || [ "gpgsign" == "$MODE" ] || [ "appsign" == "$MODE" ] || [ "appimage" == "$MODE" ]; then
    ${MODE} "$@"
else
    printUsage "$MODE"
fi