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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.
//go:build testmode
// +build testmode
package internal
import (
"encoding/json"
"os"
"os/exec"
)
// GoEnv returns the value for key in `go env`.
//
// For debugging and testing purposes, the value of
// undocumented environment variable TEST_GOVERSION
// is used for go env GOVERSION.
func GoEnv(key string) (string, error) {
out, err := exec.Command("go", "env", "-json", key).Output()
if err != nil {
return "", err
}
env := make(map[string]string)
if err := json.Unmarshal(out, &env); err != nil {
return "", err
}
if v := os.Getenv("TEST_GOVERSION"); v != "" {
// Unlikely to happen in practice, mostly used for testing.
env["GOVERSION"] = v
}
return env[key], nil
}
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