Add CI step to check license headers

Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>

.github/workflows/ci.yml

@@ -18,6 +18,9 @@ jobs:
       - name: Checkout code into the Go module directory
         uses: actions/checkout@v2
 
+      - name: Validate license headers
+        run: make validate
+
       - name: Run golangci-lint
         run: |
           curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b . v1.30.0

Dockerfile

@@ -84,3 +84,9 @@ RUN --mount=target=. \
     BUILD_TAGS=${BUILD_TAGS} \
     GIT_TAG=${GIT_TAG} \
     make -f builder.Makefile test
+
+FROM base as check-license-headers
+RUN go get -u github.com/kunalkushwaha/ltag 
+RUN --mount=target=. \
+    --mount=type=cache,target=/root/.cache/go-build \
+    make -f builder.Makefile check-license-headers

Makefile

@@ -78,6 +78,9 @@ serve: cli ## start server
 moby-cli-link: ## create com.docker.cli symlink if does not already exist
 	ln -s $(MOBY_DOCKER) /usr/local/bin/com.docker.cli
 
+validate: ## check license header for all files
+	@docker build . --target check-license-headers
+
 help: ## Show help
 	@echo Please specify a build target. The choices are:
 	@grep -E '^[0-9a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'

builder.Makefile

@@ -56,6 +56,9 @@ test:
 lint:
 	golangci-lint run --timeout 10m0s ./...
 
+check-license-headers:
+	./scripts/validate/fileheader
+
 FORCE:
 
 .PHONY: all protos cli cross test lint

scripts/validate/fileheader

@@ -0,0 +1,28 @@
+#!/usr/bin/env sh
+
+#   Copyright The Compose Specification Authors.
+
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+
+#       http://www.apache.org/licenses/LICENSE-2.0
+
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+
+set -eu -o pipefail
+
+if ! command -v ltag; then
+    >&2 echo "ERROR: ltag not found. Install with:"
+    >&2 echo "    go get -u github.com/kunalkushwaha/ltag"
+    exit 1
+fi
+
+BASEPATH="${1-}"
+
+ltag -t "${BASEPATH}scripts/validate/template" -excludes "validate testdata" --check -v

scripts/validate/template/bash.txt

@@ -0,0 +1,13 @@
+#   Copyright 2020 Docker, Inc.
+
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+
+#       http://www.apache.org/licenses/LICENSE-2.0
+
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.

scripts/validate/template/dockerfile.txt

@@ -0,0 +1,13 @@
+#   Copyright 2020 Docker, Inc.
+
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+
+#       http://www.apache.org/licenses/LICENSE-2.0
+
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.

scripts/validate/template/go.txt

@@ -0,0 +1,16 @@
+/*
+   Copyright 2020 Docker, Inc.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+

scripts/validate/template/makefile.txt

@@ -0,0 +1,13 @@
+#   Copyright 2020 Docker, Inc.
+
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+
+#       http://www.apache.org/licenses/LICENSE-2.0
+
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.