Build additional Docker image with Swift 5.5 (realm#3904)

* Build additional Docker image with Swift 5.5
* Build `swiftlint_linux_swift_5_5.zip`

.github/workflows/docker.yml

@@ -44,3 +44,41 @@ jobs:
       with:
         push: true
         tags: ghcr.io/${{ env.REPOSITORY_LC }}:${{ env.DOCKER_TAG }}
+
+  build_5_5:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Extract DOCKER_TAG using tag name
+      if: startsWith(github.ref, 'refs/tags/')
+      run: |
+        echo "DOCKER_TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
+    
+    - name: Use default DOCKER_TAG
+      if: startsWith(github.ref, 'refs/tags/') != true
+      run: |
+        echo "DOCKER_TAG=latest" >> $GITHUB_ENV
+    
+    - name: Set lowercase repository name
+      run: |
+        echo "REPOSITORY_LC=${REPOSITORY,,}" >>${GITHUB_ENV}
+      env:
+        REPOSITORY: '${{ github.repository }}'
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v1
+
+    - name: Login to Github registry
+      uses: docker/login-action@v1 
+      with:
+        username: ${{ github.actor }}
+        password:  ${{ secrets.GITHUB_TOKEN }}
+        registry: ghcr.io
+
+    - uses: docker/build-push-action@v2
+      with:
+        push: true
+        file: Dockerfile@swift-5.5
+        tags: ghcr.io/${{ env.REPOSITORY_LC }}:5.5-${{ env.DOCKER_TAG }}

.gitignore

@@ -38,10 +38,8 @@ xcuserdata
 # SwiftLint
 
 SwiftLint.pkg
-SwiftLintFramework.framework.zip
+*.zip
 benchmark_*
-portable_swiftlint.zip
-swiftlint_linux.zip
 osscheck/
 docs/
 rule_docs/

Dockerfile@swift-5.5

@@ -0,0 +1,40 @@
+# Explicitly specify `focal` because `swift:latest` does not use `ubuntu:latest`.
+ARG BUILDER_IMAGE=swift:5.5-focal
+ARG RUNTIME_IMAGE=ubuntu:focal
+
+# builder image
+FROM ${BUILDER_IMAGE} AS builder
+RUN apt-get update && apt-get install -y \
+    libcurl4-openssl-dev \
+    libxml2-dev \
+ && rm -r /var/lib/apt/lists/*
+WORKDIR /workdir/
+COPY Source Source/
+COPY Tests Tests/
+COPY Package.* ./
+
+RUN ln -s /usr/lib/swift/_InternalSwiftSyntaxParser .
+
+ARG SWIFT_FLAGS="-c release -Xswiftc -static-stdlib -Xlinker -lCFURLSessionInterface -Xlinker -lCFXMLInterface -Xlinker -lcurl -Xlinker -lxml2 -Xswiftc -I. -Xlinker -fuse-ld=lld -Xlinker -L/usr/lib/swift/linux"
+RUN swift build $SWIFT_FLAGS
+RUN mkdir -p /executables
+RUN for executable in $(swift package completion-tool list-executables); do \
+        install -v `swift build $SWIFT_FLAGS --show-bin-path`/$executable /executables; \
+    done
+
+# runtime image
+FROM ${RUNTIME_IMAGE}
+LABEL org.opencontainers.image.source https://github.com/realm/SwiftLint
+RUN apt-get update && apt-get install -y \
+    libcurl4 \
+    libxml2 \
+ && rm -r /var/lib/apt/lists/*
+COPY --from=builder /usr/lib/libsourcekitdInProc.so /usr/lib
+COPY --from=builder /usr/lib/swift/linux/libBlocksRuntime.so /usr/lib
+COPY --from=builder /usr/lib/swift/linux/libdispatch.so /usr/lib
+COPY --from=builder /usr/lib/swift/linux/lib_InternalSwiftSyntaxParser.so /usr/lib
+COPY --from=builder /executables/* /usr/bin
+
+RUN swiftlint version
+
+CMD ["swiftlint"]

Makefile

@@ -118,6 +118,13 @@ zip_linux_release:
 	cp -f "$(LICENSE_PATH)" "$(TMP_FOLDER)"
 	(cd "$(TMP_FOLDER)"; zip -yr - "swiftlint" "LICENSE") > "./swiftlint_linux.zip"
 
+zip_linux_release_5_5:
+	$(eval TMP_FOLDER := $(shell mktemp -d))
+	docker run ghcr.io/realm/swiftlint:5.5-$(VERSION_STRING) cat /usr/bin/swiftlint > "$(TMP_FOLDER)/swiftlint"
+	chmod +x "$(TMP_FOLDER)/swiftlint"
+	cp -f "$(LICENSE_PATH)" "$(TMP_FOLDER)"
+	(cd "$(TMP_FOLDER)"; zip -yr - "swiftlint" "LICENSE") > "./swiftlint_linux_swift_5_5.zip"
+
 package: build
 	$(eval PACKAGE_ROOT := $(shell mktemp -d))
 	cp "$(SWIFTLINT_EXECUTABLE)" "$(PACKAGE_ROOT)"
@@ -128,7 +135,7 @@ package: build
 		--version $(VERSION_STRING) \
 		"$(OUTPUT_PACKAGE)"
 
-release: package portable_zip zip_linux_release
+release: package portable_zip zip_linux_release zip_linux_release_5_5
 
 docker_image:
 	docker build --platform linux/amd64 --force-rm --tag swiftlint .