TUN-1734: Pin packages at exact versions

vendor/github.com/mitchellh/go-homedir/homedir.go

@@ -76,6 +76,16 @@ func Expand(path string) (string, error) {
 	return filepath.Join(dir, path[1:]), nil
 }
 
+// Reset clears the cache, forcing the next call to Dir to re-detect
+// the home directory. This generally never has to be called, but can be
+// useful in tests if you're modifying the home directory via the HOME
+// env var or something.
+func Reset() {
+	cacheLock.Lock()
+	defer cacheLock.Unlock()
+	homedirCache = ""
+}
+
 func dirUnix() (string, error) {
 	homeEnv := "HOME"
 	if runtime.GOOS == "plan9" {
@@ -141,14 +151,16 @@ func dirWindows() (string, error) {
 		return home, nil
 	}
 
+	// Prefer standard environment variable USERPROFILE
+	if home := os.Getenv("USERPROFILE"); home != "" {
+		return home, nil
+	}
+
 	drive := os.Getenv("HOMEDRIVE")
 	path := os.Getenv("HOMEPATH")
 	home := drive + path
 	if drive == "" || path == "" {
-		home = os.Getenv("USERPROFILE")
-	}
-	if home == "" {
-		return "", errors.New("HOMEDRIVE, HOMEPATH, and USERPROFILE are blank")
+		return "", errors.New("HOMEDRIVE, HOMEPATH, or USERPROFILE are blank")
 	}
 
 	return home, nil