Add license tools for repositories without vendor directories.

Needed for upcoming work for
tektoncd/pipeline#1538.

This change makes 2 changes to support Go module enabled repos
without vendor directories.

1) Use go-licenses instead of dep-collector for third_party license
   notices. dep-collector makes heavy assumptions about the existence of
   the vendor directory. go-licenses is a module aware alternative.
2) Ignore the `+build tools` flag when building/testing projects. This
   is to allow tool dependencies to be specified with Go modules following
   the recommendation of
   https://github.com/golang/go/wiki/Modules#how-can-i-track-tool-dependencies-for-a-module.

go.mod

@@ -0,0 +1,5 @@
+module github.com/tektoncd/plumbing
+
+go 1.13
+
+require github.com/google/go-licenses v0.0.0-20191112164736-212ea350c932

go.sum

@@ -0,0 +1,120 @@
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+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

hack/tools.go

@@ -0,0 +1,7 @@
+// +build tools
+
+package hack
+
+import (
+	_ "github.com/google/go-licenses"
+)

scripts/library.sh

@@ -332,16 +332,27 @@ function update_licenses() {
   cd ${REPO_ROOT_DIR} || return 1
   local dst=$1
   shift
-  run_go_tool ./vendor/github.com/knative/test-infra/tools/dep-collector dep-collector $@ > ./${dst}
+  if [ -d "${REPO_ROOT_DIR}/vendor" ]; then
+    run_go_tool ./vendor/github.com/knative/test-infra/tools/dep-collector dep-collector $@ > ./${dst}
+  else
+    GOFLAGS="-tags=tools" run_go_tool github.com/google/go-licenses go-licenses save ./... --save_path=${dst} --force
+    # Hack to make sure directories retain write permissions after save. This
+    # can happen if the directory being copied is a Go module.
+    chmod +w $(find ${dst} -type d)
+  fi
 }
 
 # Run dep-collector to check for forbidden liceses.
 # Parameters: $1...$n - directories and files to inspect.
 function check_licenses() {
-  # Fetch the google/licenseclassifier for its license db
-  go get -u github.com/google/licenseclassifier
-  # Check that we don't have any forbidden licenses in our images.
-  run_go_tool ./vendor/github.com/knative/test-infra/tools/dep-collector dep-collector -check $@
+  if [ -d "${REPO_ROOT_DIR}/vendor" ]; then
+    # Fetch the google/licenseclassifier for its license db
+    go get -u github.com/google/licenseclassifier
+    # Check that we don't have any forbidden licenses in our images.
+    run_go_tool ./vendor/github.com/knative/test-infra/tools/dep-collector dep-collector -check $@
+  else
+    GOFLAGS="-tags=tools" run_go_tool github.com/google/go-licenses go-licenses check ./...
+  fi
 }
 
 # Run the given linter on the given files, checking it exists first.

scripts/presubmit-tests.sh

@@ -148,7 +148,7 @@ function default_build_test_runner() {
   local failed=0
   # Check go code style with gofmt; exclude vendor/ files
   subheader "Checking go code style with gofmt"
-  gofmt_out=$(gofmt -d $(find * -name '*.go' ! -path 'vendor/*'))
+  gofmt_out=$(gofmt -d $(find * -name '*.go' ! -path 'vendor/*' ! -path 'third_party/*'))
   if [[ -n "$gofmt_out" ]]; then
     failed=1
   fi
@@ -167,7 +167,7 @@ function default_build_test_runner() {
   go build -v ./... || failed=1
   # Get all build tags in go code (ignore /vendor)
   local tags="$(grep -r '// +build' . \
-      | grep -v '^./vendor/' | cut -f3 -d' ' | sort | uniq | tr '\n' ' ')"
+      | grep -v '^./vendor/' | grep -v "+build tools" | cut -f3 -d' ' | sort | uniq | tr '\n' ' ')"
   if [[ -n "${tags}" ]]; then
     go test -run=^$ -tags="${tags}" ./... || failed=1
   fi