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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package test
import (
"errors"
"fmt"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"testing"
"golang.org/x/vuln/internal/testenv"
)
var unsupportedGoosGoarch = map[string]bool{
"darwin/386": true,
"darwin/arm": true,
}
// GoBuild runs "go build" on dir using the additional environment variables in
// envVarVals, which should be an alternating list of variables and values.
// It returns the path to the resulting binary, and a function
// to call when finished with the binary.
func GoBuild(t *testing.T, dir, tags string, strip bool, envVarVals ...string) (binaryPath string, cleanup func()) {
testenv.NeedsGoBuild(t)
if len(envVarVals)%2 != 0 {
t.Fatal("last args should be alternating variables and values")
}
var env []string
if len(envVarVals) > 0 {
env = os.Environ()
for i := 0; i < len(envVarVals); i += 2 {
env = append(env, fmt.Sprintf("%s=%s", envVarVals[i], envVarVals[i+1]))
}
}
gg := lookupEnv("GOOS", env, runtime.GOOS) + "/" + lookupEnv("GOARCH", env, runtime.GOARCH)
if unsupportedGoosGoarch[gg] {
t.Skipf("skipping unsupported GOOS/GOARCH pair %s", gg)
}
tmpDir, err := os.MkdirTemp("", "buildtest")
if err != nil {
t.Fatal(err)
}
abs, err := filepath.Abs(dir)
if err != nil {
t.Fatal(err)
}
binaryPath = filepath.Join(tmpDir, filepath.Base(abs))
var exeSuffix string
if runtime.GOOS == "windows" {
exeSuffix = ".exe"
}
// Make sure we use the same version of go that is running this test.
goCommandPath := filepath.Join(runtime.GOROOT(), "bin", "go"+exeSuffix)
if _, err := os.Stat(goCommandPath); err != nil {
t.Fatal(err)
}
args := []string{"build", "-o", binaryPath + exeSuffix}
if tags != "" {
args = append(args, "-tags", tags)
}
if strip {
args = append(args, "-ldflags", "-s -w")
}
cmd := exec.Command(goCommandPath, args...)
cmd.Dir = dir
cmd.Env = env
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
if ee := (*exec.ExitError)(nil); errors.As(err, &ee) && len(ee.Stderr) > 0 {
t.Fatalf("%v: %v\n%s", cmd, err, ee.Stderr)
}
t.Fatalf("%v: %v", cmd, err)
}
return binaryPath + exeSuffix, func() { os.RemoveAll(tmpDir) }
}
// lookEnv looks for name in env, a list of "VAR=VALUE" strings. It returns
// the value if name is found, and defaultValue if it is not.
func lookupEnv(name string, env []string, defaultValue string) string {
for _, vv := range env {
i := strings.IndexByte(vv, '=')
if i < 0 {
// malformed env entry; just ignore it
continue
}
if name == vv[:i] {
return vv[i+1:]
}
}
return defaultValue
}
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