Add flag for build container

build.Dockerfile

-# Build the containers with:
-#    docker run --privileged --rm -v "$(pwd)":/workspace -v /var/run/docker.sock:/var/run/docker.sock -w /workspace container_build_container ./build.sh <some_tag> --latest --push --login --no-cache
-
-FROM docker:24.0
+FROM docker:27
 
 RUN apk update && \
-    apk add --no-cache jq curl git bash nodejs npm
-
-RUN docker buildx version
+    apk add --no-cache bash curl jq nodejs npm
 
 WORKDIR /workspace
-
-CMD ["/bin/bash"]
\ No newline at end of file

build.sh

@@ -9,6 +9,8 @@ REGISTRY=registry.gitlab.tugraz.at/oop1ws/container
 NO_CACHE=false
 LOGIN=false
 
+BUILD_WITH_CONTAINER=false
+
 print_usage() {
   echo "
     $SCRIPT v$VERSION
@@ -31,13 +33,15 @@ print_usage() {
       --push          Push the build result to the registry
       --registry      Use a custom container registry
       --no-cache      Do not use cache when building the images
-      --login     Use the environment variables 'DOCKER_USERNAME'
-                  and 'DOCKER_PASSWORD' to automatically login to the
-                  registry
+      --login         Use the environment variables 'DOCKER_USERNAME' and
+                      'DOCKER_PASSWORD' to automatically login to the registry
+      --use-container Perform the building steps within a dedicated container
+                      that already has all required build dependencies installed
   "
 }
 
 ARGS=()
+ALL_ARGS="$@"
 
 while [[ $# -gt 0 ]]; do
   case $1 in
@@ -61,6 +65,9 @@ while [[ $# -gt 0 ]]; do
     --login)
       LOGIN=true
       ;;
+    --use-container)
+      BUILD_WITH_CONTAINER=true
+      ;;
     -*|--*)
       echo "ERROR: Unknown option $1"
       exit 1
@@ -92,6 +99,16 @@ check_command() {
 }
 
 check_command "docker" "Docker"
+
+if $BUILD_WITH_CONTAINER; then
+  WORKSPACE=$(dirname "$0")
+  BUILD_IMAGE="$REGISTRY/builder"
+  BUILD_ARGS=${ALL_ARGS//"--use-container "/}
+
+  docker build --tag "$BUILD_IMAGE" -f build.Dockerfile .
+  docker run --rm -e DOCKER_USERNAME -e DOCKER_PASSWORD -v /var/run/docker.sock:/var/run/docker.sock:ro -v "$WORKSPACE":/workspace "$REGISTRY/builder" ./build.sh $BUILD_ARGS
+  exit $?
+else
   check_command "npx" "Node.js"
   check_command "jq" "jq"
 
@@ -100,18 +117,20 @@ if [ $? -ne 0 ]; then
     echo "ERROR: The Docker CLI plugin 'buildx' is not installed"
     exit 1
   fi
+fi
+
 
 # =============================
 #  prepare environment
 # =============================
 
 if $LOGIN; then
-  if [ -v $DOCKER_PASSWORD ]; then
-    echo "ERROR: Variable 'DOCKER_PASSWORD' not set"
-    exit 1
-  elif [ -v $DOCKER_USERNAME ]; then
+  if [ -z $DOCKER_USERNAME ]; then
     echo "ERROR: Variable 'DOCKER_USERNAME' not set"
     exit 1
+  elif [ -z $DOCKER_PASSWORD ]; then
+    echo "ERROR: Variable 'DOCKER_PASSWORD' not set"
+    exit 1
   fi
   echo "$DOCKER_PASSWORD" | docker login --username "$DOCKER_USERNAME" --password-stdin $REGISTRY