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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"
"os"
"os/exec"
"path/filepath"
"strings"
)
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
}
// unset GOPATH if it's set, so we use modules
func goBuildEnviron() []string {
out := []string{}
for _, kvp := range os.Environ() {
if !strings.HasPrefix(kvp, "GOPATH=") {
out = append(out, kvp)
}
}
return out
}
func buildGoProgram(modPath, outputFilePath string) error {
cmd := exec.Command("go", "build", "-o", outputFilePath, ".")
cmd.Dir = modPath
cmd.Env = goBuildEnviron()
return run(cmd)
}
func modInit(path, name string) error {
cmd := exec.Command("go", "mod", "init", name)
cmd.Dir = path
return run(cmd)
}
func addLibcni(path, gitRef string) error {
cmd := exec.Command("go", "get", "github.com/containernetworking/cni@"+gitRef)
cmd.Dir = path
return run(cmd)
}
// 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 {
tempDir, err := ioutil.TempDir(os.Getenv("GOTMPDIR"), "cni-test-")
if err != nil {
return err
}
defer os.RemoveAll(tempDir)
modName := filepath.Base(tempDir)
if err := modInit(tempDir, modName); err != nil {
return err
}
// go get
if err := addLibcni(tempDir, gitRef); err != nil {
return err
}
if err := ioutil.WriteFile(filepath.Join(tempDir, "main.go"), programSource, 0600); err != nil {
return err
}
err = buildGoProgram(tempDir, outputFilePath)
if err != nil {
return fmt.Errorf("failed to build: %w", err)
}
return nil
}
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