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// Copyright 2016 CNI 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.
// Package testhelpers supports testing of CNI components of different versions
//
// For example, to build a plugin against an old version of the CNI library,
// we can pass the plugin's source and the old git commit reference to BuildAt.
// We could then test how the built binary responds when called by the latest
// version of this library.
package testhelpers
import (
"fmt"
"io/ioutil"
"math/rand"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
)
const packageBaseName = "github.com/containernetworking/cni"
func run(cmd *exec.Cmd) error {
out, err := cmd.CombinedOutput()
if err != nil {
command := strings.Join(cmd.Args, " ")
return fmt.Errorf("running %q: %s", command, out)
}
return nil
}
func goBuildEnviron(gopath string) []string {
environ := os.Environ()
for i, kvp := range environ {
if strings.HasPrefix(kvp, "GOPATH=") {
environ[i] = "GOPATH=" + gopath
return environ
}
}
environ = append(environ, "GOPATH="+gopath)
return environ
}
func buildGoProgram(gopath, packageName, outputFilePath string) error {
cmd := exec.Command("go", "build", "-o", outputFilePath, packageName)
cmd.Env = goBuildEnviron(gopath)
return run(cmd)
}
func createSingleFilePackage(gopath, packageName string, fileContents []byte) error {
dirName := filepath.Join(gopath, "src", packageName)
err := os.MkdirAll(dirName, 0700)
if err != nil {
return err
}
return ioutil.WriteFile(filepath.Join(dirName, "main.go"), fileContents, 0600)
}
func removePackage(gopath, packageName string) error {
dirName := filepath.Join(gopath, "src", packageName)
return os.RemoveAll(dirName)
}
func isRepoRoot(path string) bool {
_, err := ioutil.ReadDir(filepath.Join(path, ".git"))
return (err == nil) && (filepath.Base(path) == "cni")
}
func LocateCurrentGitRepo() (string, error) {
dir, err := os.Getwd()
if err != nil {
return "", err
}
for i := 0; i < 5; i++ {
if isRepoRoot(dir) {
return dir, nil
}
dir, err = filepath.Abs(filepath.Dir(dir))
if err != nil {
return "", fmt.Errorf("abs(dir(%q)): %s", dir, err)
}
}
return "", fmt.Errorf("unable to find cni repo root, landed at %q", dir)
}
func gitCloneThisRepo(cloneDestination string) error {
err := os.MkdirAll(cloneDestination, 0700)
if err != nil {
return err
}
currentGitRepo, err := LocateCurrentGitRepo()
if err != nil {
return err
}
return run(exec.Command("git", "clone", currentGitRepo, cloneDestination))
}
func gitCheckout(localRepo string, gitRef string) error {
return run(exec.Command("git", "-C", localRepo, "checkout", gitRef))
}
// BuildAt builds the go programSource using the version of the CNI library
// at gitRef, and saves the resulting binary file at outputFilePath
func BuildAt(programSource []byte, gitRef string, outputFilePath string) error {
tempGoPath, err := ioutil.TempDir("", "cni-git-")
if err != nil {
return err
}
defer os.RemoveAll(tempGoPath)
cloneDestination := filepath.Join(tempGoPath, "src", packageBaseName)
err = gitCloneThisRepo(cloneDestination)
if err != nil {
return err
}
err = gitCheckout(cloneDestination, gitRef)
if err != nil {
return err
}
rand.Seed(time.Now().UnixNano())
testPackageName := fmt.Sprintf("test-package-%x", rand.Int31())
err = createSingleFilePackage(tempGoPath, testPackageName, programSource)
if err != nil {
return err
}
defer removePackage(tempGoPath, testPackageName)
err = buildGoProgram(tempGoPath, testPackageName, outputFilePath)
if err != nil {
return err
}
return nil
}
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