Add -notice flag to autogenerate NOTICE files (#25)

Adds a -notice flag and a subset of flags tied to -notice. When the flag
is set, generates a `NOTICE` file at the root folder of the project when
used with or stdout when using `-d` for dry runs.

The NOTICE file generation heavily relies on the `go.mod` file and its
contents, Any other dependency managers outside of those reliant on
`go.mod` won't be able to make use of this feature.

By enabling this feature, the binary won't be zery dependency anymore
even though it's still very fast.

The format is fixed unless the Go template is overriden with the flag
`-notice-header`, in which case only the header is overwritten,
maintaining the list of dependencies and licenses within enclosed `=`.

It also changes the default error code from `0` to `255` any time the
error is not nil. Before any unspecified errorcodes defaulted to 0 which
is not the desired behaviour.

Signed-off-by: Marc Lopez <[email protected]>

.travis.yml

@@ -1,10 +1,16 @@
 language: go
 
 go:
-  - "1.x"
-  - "1.9.x"
-  - "1.10.x"
   - "1.11.x"
+  - "1.12.x"
+
+env:
+  - GO111MODULE=on
+
+cache:
+  directories:
+    - $HOME/.cache/go-build
+    - $HOME/gopath/pkg/mod
 
 matrix:
   fast_finish: true

Makefile

@@ -1,4 +1,5 @@
 export VERSION := 0.2.0
+export GO111MODULE ?= on
 OWNER ?= elastic
 REPO ?= go-licenser
 TEST_UNIT_FLAGS ?= -timeout 10s -p 4 -race -cover
@@ -8,6 +9,7 @@ GOIMPORTS_PRESENT := $(shell command -v goimports 2> /dev/null)
 GORELEASER_PRESENT := $(shell command -v goreleaser 2> /dev/null)
 RELEASED = $(shell git tag -l $(VERSION))
 DEFAULT_LDFLAGS ?= -X main.version=$(VERSION)-dev -X main.commit=$(shell git rev-parse HEAD)
+LICENSER_FORMAT_FLAGS ?= -notice -notice-year 2018 -notice-project-name "Go Licenser"
 
 define HELP
 /////////////////////////////////////////
@@ -21,7 +23,7 @@ define HELP
 
 ## Development targets
 
-- deps:                   It will install the dependencies required to run developemtn targets.
+- deps:                   It will install the dependencies required to run development targets.
 - unit:                   Runs the unit tests.
 - lint:                   Runs the linters.
 - format:                 Formats the source files according to gofmt, goimports and go-licenser.
@@ -43,11 +45,12 @@ help:
 .PHONY: deps
 deps:
 ifndef GOLINT_PRESENT
-	@ go get -u golang.org/x/lint/golint
+	@ GO111MODULE=off go get -u golang.org/x/lint/golint
 endif
 ifndef GOIMPORTS_PRESENT
-	@ go get -u golang.org/x/tools/cmd/goimports
+	@ GO111MODULE=off go get -u golang.org/x/tools/cmd/goimports
 endif
+	@ go mod download
 
 .PHONY: release_deps
 release_deps:
@@ -68,11 +71,11 @@ unit:
 
 .PHONY: build
 build: deps
-	@ go build -o bin/$(REPO) -ldflags="$(DEFAULT_LDFLAGS)"
+	@ CGO_ENABLED=0 go build -o bin/$(REPO) -ldflags="$(DEFAULT_LDFLAGS)"
 
 .PHONY: install
 install: deps
-	@ go install
+	@ CGO_ENABLED=0 go install
 
 .PHONY: lint
 lint: build
@@ -84,7 +87,7 @@ lint: build
 format: deps build
 	@ gofmt -e -w -s .
 	@ goimports -w .
-	@ ./bin/go-licenser -exclude golden
+	@ ./bin/go-licenser -exclude golden $(LICENSER_FORMAT_FLAGS)
 
 .PHONY: release
 release: deps release_deps

NOTICE

@@ -1,5 +1,14 @@
-Elastic go-licenser
-Copyright 2018 Elasticsearch B.V.
+Go Licenser
+Copyright 2018-2019 Elasticsearch B.V.
 
-This product includes software developed at
-Elasticsearch, B.V. (https://www.elastic.co/).
+This product includes software developed at Elasticsearch B.V. and
+third-party software developed by the licenses listed below.
+
+=========================================================================
+
+gopkg.in/src-d/go-license-detector.v2    Apache-2.0
+golang.org/x/exp                         BSD-3-Clause
+github.com/sirkon/goproxy                MIT
+github.com/hashicorp/go-multierror       MPL-2.0
+
+=========================================================================

README.md

@@ -1,8 +1,9 @@
 # Go Licenser [![Build Status](https://travis-ci.org/elastic/go-licenser.svg?branch=master)](https://travis-ci.org/elastic/go-licenser)
 
-Small zero dependency license header checker for source files. The aim of this project is to provide a common
-binary that can be used to ensure that code source files contain a license header. It's unlikely that this project
-is useful outside of Elastic **_at the current stage_**, but the `licensing` package can be used as a building block.
+Small license header checker for source files, mainly thought and tested for Go source files although it might work for other ones. The aim of this project is to provide a common
+binary that can be used to ensure that code source files contain a license header.
+
+Additionally, when the `-notice` flag is set, generates a `NOTICE` file at the root folder of the project when used with or stdout when using `-d` for dry runs.
 
 ## Supported Licenses
 
@@ -28,6 +29,9 @@ Usage: go-licenser [flags] [path]
   go-licenser walks the specified path recursiely and appends a license Header if the current
   header doesn't match the one found in the file.
 
+  Using the -notice flag a compiled list of the project's dependencies and licenses is compiled
+  after the "go.mod" file is inspected. If the dependencies aren't found locally, it will fail.
+
 Options:
 
   -d	skips rewriting files and returns exitcode 1 if any discrepancies are found.
@@ -39,6 +43,16 @@ Options:
     	sets the license type to check: ASL2, Elastic, Cloud (default "ASL2")
   -licensor string
         sets the name of the licensor (default "Elasticsearch B.V.")
+  -notice
+    	generates a NOTICE (use -notice-file to change it) file on the folder where it's being run.
+  -notice-file string
+    	specifies the file where to write the license notice. (default "NOTICE")
+  -notice-header string
+    	specifies the notice header Go Template.
+  -notice-project-name string
+    	specifies the notice project name at the top of the Go Template (defaults to folder name).
+  -notice-year string
+    	specifies the start of the project so the notice file reflects it.
   -version
     	prints out the binary version.
 ```

appveyor.yml

@@ -8,7 +8,9 @@ clone_folder: c:\gopath\src\github.com\elastic\go-licenser
 
 environment:
   GOPATH: c:\gopath
-  GOVERSION: 1.10
+  GOVERSION: 1.12
+  GO111MODULE: on
+  CGO_ENABLED: 0
 
 # Build
 
@@ -23,8 +25,11 @@ install:
   - go env
 
 before_build:
+  - go mod download
+  - set GO111MODULE=off
   - go get -u golang.org/x/lint/golint
   - go get -u golang.org/x/tools/cmd/goimports
+  - set GO111MODULE=on
   - golint -set_exit_status .
   - gofmt -d -e -s .
   - goimports -d .
@@ -35,4 +40,4 @@ build_script:
 
 test_script:
   - go-licenser -d -exclude golden
-  - go test -timeout 10s -p 4 -race -cover ./...
+  - go test -timeout 10s -p 4 -cover ./...

error.go

@@ -32,8 +32,11 @@ func (e Error) Error() string {
 
 // Code returns the exitcode for the error
 func Code(e error) int {
+	if e == nil {
+		return 0
+	}
 	if err, ok := e.(*Error); ok {
 		return err.code
 	}
-	return 0
+	return 255
 }

error_test.go

@@ -37,11 +37,11 @@ func TestCode(t *testing.T) {
 			want: 0,
 		},
 		{
-			name: "standard error returns 0",
+			name: "standard error returns 255",
 			args: args{
 				e: errors.New("an error"),
 			},
-			want: 0,
+			want: 255,
 		},
 		{
 			name: "Error error returns 1",

fixtures/go.mod

@@ -0,0 +1,9 @@
+module github.com/elastic/go-licenser/fixtures
+
+go 1.12
+
+require (
+	github.com/hashicorp/go-multierror v1.0.0
+	github.com/sirkon/goproxy v1.4.0
+	gopkg.in/src-d/go-license-detector.v2 v2.0.1
+)

go.mod

@@ -1 +1,10 @@
 module github.com/elastic/go-licenser
+
+go 1.12
+
+require (
+	github.com/hashicorp/go-multierror v1.0.0
+	github.com/sirkon/goproxy v1.4.0
+	golang.org/x/exp v0.0.0-20190121172915-509febef88a4 // indirect
+	gopkg.in/src-d/go-license-detector.v2 v2.0.1
+)

go.sum

@@ -0,0 +1,118 @@
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golden/NOTICE

@@ -0,0 +1,13 @@
+SomeProject
+Copyright 2019 Elasticsearch B.V.
+
+This product includes software developed at Elasticsearch B.V. and
+third-party software developed by the licenses listed below.
+
+=========================================================================
+
+gopkg.in/src-d/go-license-detector.v2    Apache-2.0
+github.com/sirkon/goproxy                MIT
+github.com/hashicorp/multierror-go       MPL-2.0
+
+=========================================================================

golden/go.mod

@@ -0,0 +1,9 @@
+module github.com/elastic/go-licenser/fixtures
+
+go 1.12
+
+require (
+	github.com/hashicorp/go-multierror v1.0.0
+	github.com/sirkon/goproxy v1.4.0
+	gopkg.in/src-d/go-license-detector.v2 v2.0.1
+)