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// untested sections: 5
package gexec
import (
"crypto/md5"
"encoding/hex"
"errors"
"fmt"
"go/build"
"io/ioutil"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strings"
"sync"
)
var (
mu sync.Mutex
tmpDir string
)
/*
Build uses go build to compile the package at packagePath. The resulting binary is saved off in a temporary directory.
A path pointing to this binary is returned.
Build uses the $GOPATH set in your environment. If $GOPATH is not set and you are using Go 1.8+,
it will use the default GOPATH instead. It passes the variadic args on to `go build`.
*/
func Build(packagePath string, args ...string) (compiledPath string, err error) {
return doBuild(build.Default.GOPATH, packagePath, nil, args...)
}
/*
BuildWithEnvironment is identical to Build but allows you to specify env vars to be set at build time.
*/
func BuildWithEnvironment(packagePath string, env []string, args ...string) (compiledPath string, err error) {
return doBuild(build.Default.GOPATH, packagePath, env, args...)
}
/*
BuildIn is identical to Build but allows you to specify a custom $GOPATH (the first argument).
*/
func BuildIn(gopath string, packagePath string, args ...string) (compiledPath string, err error) {
return doBuild(gopath, packagePath, nil, args...)
}
func doBuild(gopath, packagePath string, env []string, args ...string) (compiledPath string, err error) {
executable, err := newExecutablePath(gopath, packagePath)
if err != nil {
return "", err
}
cmdArgs := append([]string{"build"}, args...)
cmdArgs = append(cmdArgs, "-o", executable, packagePath)
build := exec.Command("go", cmdArgs...)
build.Env = replaceGoPath(os.Environ(), gopath)
build.Env = append(build.Env, env...)
output, err := build.CombinedOutput()
if err != nil {
return "", fmt.Errorf("Failed to build %s:\n\nError:\n%s\n\nOutput:\n%s", packagePath, err, string(output))
}
return executable, nil
}
/*
CompileTest uses go test to compile the test package at packagePath. The resulting binary is saved off in a temporary directory.
A path pointing to this binary is returned.
CompileTest uses the $GOPATH set in your environment. If $GOPATH is not set and you are using Go 1.8+,
it will use the default GOPATH instead. It passes the variadic args on to `go test`.
*/
func CompileTest(packagePath string, args ...string) (compiledPath string, err error) {
return doCompileTest(build.Default.GOPATH, packagePath, nil, args...)
}
/*
GetAndCompileTest is identical to CompileTest but `go get` the package before compiling tests.
*/
func GetAndCompileTest(packagePath string, args ...string) (compiledPath string, err error) {
if err := getForTest(build.Default.GOPATH, packagePath, nil); err != nil {
return "", err
}
return doCompileTest(build.Default.GOPATH, packagePath, nil, args...)
}
/*
CompileTestWithEnvironment is identical to CompileTest but allows you to specify env vars to be set at build time.
*/
func CompileTestWithEnvironment(packagePath string, env []string, args ...string) (compiledPath string, err error) {
return doCompileTest(build.Default.GOPATH, packagePath, env, args...)
}
/*
GetAndCompileTestWithEnvironment is identical to GetAndCompileTest but allows you to specify env vars to be set at build time.
*/
func GetAndCompileTestWithEnvironment(packagePath string, env []string, args ...string) (compiledPath string, err error) {
if err := getForTest(build.Default.GOPATH, packagePath, env); err != nil {
return "", err
}
return doCompileTest(build.Default.GOPATH, packagePath, env, args...)
}
/*
CompileTestIn is identical to CompileTest but allows you to specify a custom $GOPATH (the first argument).
*/
func CompileTestIn(gopath string, packagePath string, args ...string) (compiledPath string, err error) {
return doCompileTest(gopath, packagePath, nil, args...)
}
/*
GetAndCompileTestIn is identical to GetAndCompileTest but allows you to specify a custom $GOPATH (the first argument).
*/
func GetAndCompileTestIn(gopath string, packagePath string, args ...string) (compiledPath string, err error) {
if err := getForTest(gopath, packagePath, nil); err != nil {
return "", err
}
return doCompileTest(gopath, packagePath, nil, args...)
}
func isLocalPackage(packagePath string) bool {
return strings.HasPrefix(packagePath, ".")
}
func getForTest(gopath, packagePath string, env []string) error {
if isLocalPackage(packagePath) {
return nil
}
return doGet(gopath, packagePath, env, "-t")
}
func doGet(gopath, packagePath string, env []string, args ...string) error {
args = append(args, packagePath)
args = append([]string{"get"}, args...)
goGet := exec.Command("go", args...)
goGet.Dir = gopath
goGet.Env = replaceGoPath(os.Environ(), gopath)
goGet.Env = append(goGet.Env, env...)
output, err := goGet.CombinedOutput()
if err != nil {
return fmt.Errorf("Failed to get %s:\n\nError:\n%s\n\nOutput:\n%s", packagePath, err, string(output))
}
return nil
}
func doCompileTest(gopath, packagePath string, env []string, args ...string) (compiledPath string, err error) {
executable, err := newExecutablePath(gopath, packagePath, ".test")
if err != nil {
return "", err
}
cmdArgs := append([]string{"test", "-c"}, args...)
cmdArgs = append(cmdArgs, "-o", executable, packagePath)
build := exec.Command("go", cmdArgs...)
build.Env = replaceGoPath(os.Environ(), gopath)
build.Env = append(build.Env, env...)
output, err := build.CombinedOutput()
if err != nil {
return "", fmt.Errorf("Failed to build %s:\n\nError:\n%s\n\nOutput:\n%s", packagePath, err, string(output))
}
return executable, nil
}
func replaceGoPath(environ []string, newGoPath string) []string {
newEnviron := []string{}
for _, v := range environ {
if !strings.HasPrefix(v, "GOPATH=") {
newEnviron = append(newEnviron, v)
}
}
return append(newEnviron, "GOPATH="+newGoPath)
}
func newExecutablePath(gopath, packagePath string, suffixes ...string) (string, error) {
tmpDir, err := temporaryDirectory()
if err != nil {
return "", err
}
if len(gopath) == 0 {
return "", errors.New("$GOPATH not provided when building " + packagePath)
}
hash := md5.Sum([]byte(packagePath))
filename := fmt.Sprintf("%s-%x%s", path.Base(packagePath), hex.EncodeToString(hash[:]), strings.Join(suffixes, ""))
executable := filepath.Join(tmpDir, filename)
if runtime.GOOS == "windows" {
executable += ".exe"
}
return executable, nil
}
/*
You should call CleanupBuildArtifacts before your test ends to clean up any temporary artifacts generated by
gexec. In Ginkgo this is typically done in an AfterSuite callback.
*/
func CleanupBuildArtifacts() {
mu.Lock()
defer mu.Unlock()
if tmpDir != "" {
os.RemoveAll(tmpDir)
tmpDir = ""
}
}
func temporaryDirectory() (string, error) {
var err error
mu.Lock()
defer mu.Unlock()
if tmpDir == "" {
tmpDir, err = ioutil.TempDir("", "gexec_artifacts")
if err != nil {
return "", err
}
}
return ioutil.TempDir(tmpDir, "g")
}
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