[Resolves #71] Add trimpath arg to gobuild (#102)

* Add trimpath arg to gobuild

* Add build constraints for trimpath usage

* Reduce duplications across go versions

* Change trimpath fn-files for better names

* Attempt to apply with minikube on Travis

* Attempt to apply with KinD on Travis

* Install kind thru curl to not affect build

.travis.yml

@@ -1,18 +1,30 @@
-sudo: false
+sudo: required
 
 dist: trusty
 
+services:
+  - docker
+
 language:
   - go
 
 go:
-  - "1.12"
-  - "1.13"
+  - '1.12'
+  - '1.13'
 
 git:
   depth: 1
 
-install: true
+install: true # skipping the default go dependencies install step
+
+before_script:
+  # Download and install kubectl
+  - curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/
+  # Download and install KinD
+  - curl -Lo ./kind https://github.com/kubernetes-sigs/kind/releases/download/v0.5.1/kind-$(uname)-amd64 && chmod +x ./kind && sudo mv kind /usr/local/bin/
+  # Create a new Kubernetes cluster using KinD
+  - kind create cluster
+  - export KUBECONFIG=$(kind get kubeconfig-path)
 
 script:
   # Verify that all source files are correctly formatted.
@@ -20,7 +32,7 @@ script:
 
   - go clean -i
   - go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
-
+  - bash integration_test.sh
 # TODO: Set up coverage.
 #after_success:
 #  - bash <(curl -s https://codecov.io/bash)

integration_test.sh

@@ -0,0 +1,2 @@
+go install ./cmd/ko
+ko apply -f ./cmd/ko/test -L

pkg/build/gobuild.go

@@ -154,13 +154,14 @@ func build(ip string, platform v1.Platform, disableOptimizations bool) (string,
 	}
 	file := filepath.Join(tmpDir, "out")
 
-	args := make([]string, 0, 6)
+	args := make([]string, 0, 7)
 	args = append(args, "build")
 	if disableOptimizations {
 		// Disable optimizations (-N) and inlining (-l).
 		args = append(args, "-gcflags", "all=-N -l")
 	}
 	args = append(args, "-o", file)
+	args = addGo113TrimPathFlag(args)
 	args = append(args, ip)
 	cmd := exec.Command("go", args...)
 

pkg/build/trimpath_113.go

@@ -0,0 +1,22 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// 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.
+//
+// house flag adding function for go1.13 and later version with -trimpath available
+// +build go1.13
+
+package build
+
+func addGo113TrimPathFlag(args []string) []string {
+	return append(args, "-trimpath")
+}

pkg/build/trimpath_pre113.go

@@ -0,0 +1,22 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// 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.
+//
+// house placeholder function for go1.12 and earlier version without -trimpath
+// +build !go1.13
+
+package build
+
+func addGo113TrimPathFlag(args []string) []string {
+	return args
+}