check-for-updates.sh

#!/bin/bash
# Apache
# An Apache container with an improved configuration structure.
#
# Copyright (c) 2021  SGS Serious Gaming & Simulations GmbH
#
# This work is licensed under the terms of the MIT license.
# For a copy, see LICENSE file or <https://opensource.org/licenses/MIT>.
#
# SPDX-License-Identifier: MIT
# License-Filename: LICENSE

set -eu -o pipefail
export LC_ALL=C.UTF-8

[ -v CI_TOOLS ] && [ "$CI_TOOLS" == "SGSGermany" ] \
    || { echo "Invalid build environment: Environment variable 'CI_TOOLS' not set or invalid" >&2; exit 1; }

[ -v CI_TOOLS_PATH ] && [ -d "$CI_TOOLS_PATH" ] \
    || { echo "Invalid build environment: Environment variable 'CI_TOOLS_PATH' not set or invalid" >&2; exit 1; }

source "$CI_TOOLS_PATH/helper/common.sh.inc"
source "$CI_TOOLS_PATH/helper/chkupd.sh.inc"
source "$CI_TOOLS_PATH/helper/git.sh.inc"

BUILD_DIR="$(CDPATH= cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
source "$BUILD_DIR/container.env"

TAG="${TAGS%% *}"

# check whether the base image was updated
chkupd_baseimage "$REGISTRY/$OWNER/$IMAGE" "$TAG" || exit 0

# check whether the image is using the latest MariaDB version
if [ -z "${VERSION:-}" ]; then
    # check whether ./vendor/<version>/alpine/Makefile indicates a new version
    git_clone "$MERGE_IMAGE_GIT_REPO" "$MERGE_IMAGE_GIT_REF" "$BUILD_DIR/vendor" "./vendor"

    echo + "VERSION=\"\$(sed -ne 's/^ENV HTTPD_VERSION \(.*\)$/\1/p' $(quote "./vendor/$MERGE_IMAGE_BUD_CONTEXT/Dockerfile"))\"" >&2
    VERSION="$(sed -ne 's/^ENV HTTPD_VERSION \(.*\)$/\1/p' "$BUILD_DIR/vendor/$MERGE_IMAGE_BUD_CONTEXT/Dockerfile" || true)"

    if [ -z "$VERSION" ]; then
        echo "Unable to read Apache version from './vendor/$MERGE_IMAGE_BUD_CONTEXT/Dockerfile': Version not found" >&2
        exit 1
    elif ! [[ "$VERSION" =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)([+~-]|$) ]]; then
        echo "Unable to read Apache version from './vendor/$MERGE_IMAGE_BUD_CONTEXT/Dockerfile': '$VERSION' is no valid version" >&2
        exit 1
    fi

    VERSION="${BASH_REMATCH[1]}.${BASH_REMATCH[2]}.${BASH_REMATCH[3]}"
fi

chkupd_image_version "$REGISTRY/$OWNER/$IMAGE:$TAG" "$VERSION" || exit 0