*: add license header checking and tweak Makefile

- move file-finding logic into lint check script
- move lint check script into .tool/ subdirectory (similar to
  opencontainers/runtime-spec)
- add a simple `check-license` script to .tool/ to ensure all Go source
  files have an Apache license header, and wire up to `check-license`
  make target
- invoke this from travis
- add `schema-fs` target to generate schema/fs.go (including header)
- add header everywhere it's missing so far
- add `output/` directory to .gitignore

Signed-off-by: Jonathan Boulle <jonathanboulle@gmail.com>

.gitignore

@@ -1,3 +1,4 @@
-oci-validate-examples
 code-of-conduct.md
 oci-image-tool
+oci-validate-examples
+output

.header

@@ -0,0 +1,14 @@
+// Copyright 2016 The Linux Foundation
+//
+// 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.
+

.tool/check-license

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+ret=0
+
+for file in $(find . -type f -iname '*.go' ! -path './vendor/*'); do
+	(head -n3 "${file}" | grep -Eq "(Copyright|generated|GENERATED)") || (echo -e "${file}:missing license header" && ret=1)
+done
+
+exit $ret

.tool/lint

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+if [ ! $(command -v gometalinter) ]; then
+	go get github.com/alecthomas/gometalinter
+	gometalinter --update --install
+fi
+
+for d in $(find . -type d -not -iwholename '*.git*' -a -not -iname '.tool'); do
+	gometalinter \
+		--exclude='error return value not checked.*(Close|Log|Print).*\(errcheck\)$' \
+		--exclude='.*_test\.go:.*error return value not checked.*\(errcheck\)$' \
+		--exclude='duplicate of.*_test.go.*\(dupl\)$' \
+		--exclude='schema/fs.go' \
+		--disable=aligncheck \
+		--disable=gotype \
+		--cyclo-over=20 \
+		--tests \
+		--deadline=10s "${d}"
+done

.travis.yml

@@ -18,5 +18,6 @@ install: true
 script:
   - git-validation -run DCO,short-subject -v -range ${TRAVIS_COMMIT_RANGE}
   - make lint
+  - make check-license
   - make test
   - make oci-image-tool

Makefile

@@ -64,8 +64,17 @@ oci-validate-examples: cmd/oci-validate-examples/main.go
 oci-image-tool:
 	go build ./cmd/oci-image-tool
 
+schema-fs:
+	@echo "generating schema fs"
+	@cd schema && echo -e "$$(cat ../.header)\n\n$$(go generate)" > fs.go
+
+check-license:
+	@echo "checking license headers"
+	@./.tool/check-license
+
 lint:
-	for d in $(shell find . -type d -not -iwholename '*.git*'); do echo "$${d}" && ./lint "$${d}"; done
+	@echo "checking lint"
+	@./.tool/lint
 
 test:
 	go test -race ./...
@@ -78,6 +87,7 @@ media-types.png: media-types.dot
 .PHONY: \
 	validate-examples \
 	oci-image-tool \
+	check-license \
 	lint \
 	docs \
 	test

cmd/oci-image-tool/main.go

@@ -1,3 +1,17 @@
+// Copyright 2016 The Linux Foundation
+//
+// 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.
+
 package main
 
 import (

cmd/oci-image-tool/validate.go

@@ -1,3 +1,17 @@
+// Copyright 2016 The Linux Foundation
+//
+// 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.
+
 package main
 
 import (

schema/doc.go

@@ -1,2 +1,16 @@
+// Copyright 2016 The Linux Foundation
+//
+// 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.
+
 // Package schema defines the OCI image media types, schema definitions and validation functions.
 package schema