move the Env key out of internal packages

common/env.go

@@ -0,0 +1,11 @@
+package common
+
+type envKey string
+
+// Env is a context key that can be used to set programmatically the environment
+// gopsutil relies on to perform calls against the OS.
+// Example of use:
+//
+//	ctx := context.WithValue(context.Background(), Env, map[string]string{"HOST_PROC": "/myproc"})
+//	avg, err := load.AvgWithContext(ctx)
+var Env = envKey("env")

internal/common/common.go

@@ -25,6 +25,8 @@ import (
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/shirou/gopsutil/v3/common"
 )
 
 var (
@@ -32,10 +34,6 @@ var (
 	ErrTimeout = errors.New("command timed out")
 )
 
-type envKey string
-
-var Env = envKey("string")
-
 type Invoker interface {
 	Command(string, ...string) ([]byte, error)
 	CommandWithContext(context.Context, string, ...string) ([]byte, error)
@@ -329,7 +327,7 @@ func PathExistsWithContents(filename string) bool {
 // The context may optionally contain a map superseding os.Env.
 func GetEnvWithContext(ctx context.Context, key string, dfault string, combineWith ...string) string {
 	var value string
-	if env, ok := ctx.Value(Env).(map[string]string); ok {
+	if env, ok := ctx.Value(common.Env).(map[string]string); ok {
 		value = env[key]
 	}
 	if value == "" {