Random changesext4

2 files changed, 30 insertions, 19 deletions

diff --git a/util/errors.go b/util/errors.go
index f10569e..f0b9403 100644
--- a/util/errors.go
+++ b/util/errors.go
@@ -28,6 +28,28 @@ import (
 	"github.com/pkg/errors"
 )
 
+var (
+	// ErrNotRoot indicates the action is restricted to the superuser.
+	ErrNotRoot = errors.New("only root can perform this action")
+	// ErrSkipIntegration indicates integration tests shouldn't be run.
+	ErrSkipIntegration = errors.New("skipping integration test")
+)
+
+// testEnvVarName is the name on an environment variable that should be set to
+// an empty mountpoint. This is only used for integration tests. If not set,
+// integration tests are skipped.
+var testEnvVarName = "TEST_FILESYSTEM_ROOT"
+
+// TestRoot returns a the root of a filesystem specified by testEnvVarName. This
+// function is only used for integration tests.
+func TestRoot() (string, error) {
+	path := os.Getenv(testEnvVarName)
+	if path == "" {
+		return "", ErrSkipIntegration
+	}
+	return path, nil
+}
+
 // ErrReader wraps an io.Reader, passing along calls to Read() until a read
 // fails. Then, the error is stored, and all subsequent calls to Read() do
 // nothing. This allows you to write code which has many subsequent reads and
@@ -114,22 +136,3 @@ func NeverError(err error) {
 		log.Panicf("NeverError() check failed: %v", err)
 	}
 }
-
-var (
-	// testEnvVarName is the name on an environment variable that should be
-	// set to an empty mountpoint. This is only used for integration tests.
-	// If not set, integration tests are skipped.
-	testEnvVarName = "TEST_FILESYSTEM_ROOT"
-	// ErrSkipIntegration indicates integration tests shouldn't be run.
-	ErrSkipIntegration = errors.New("skipping integration test")
-)
-
-// TestRoot returns a the root of a filesystem specified by testEnvVarName. This
-// function is only used for integration tests.
-func TestRoot() (string, error) {
-	path := os.Getenv(testEnvVarName)
-	if path == "" {
-		return "", ErrSkipIntegration
-	}
-	return path, nil
-}
diff --git a/util/users.go b/util/users.go
index 92affa8..49abd32 100644
--- a/util/users.go
+++ b/util/users.go
@@ -48,3 +48,11 @@ func GetUser(uid int) *user.User {
 func CurrentUser() *user.User {
 	return GetUser(CurrentUserID())
 }
+
+// CheckIfRoot returns ErrNotRoot if the current user is not the root user.
+func CheckIfRoot() error {
+	if id := CurrentUserID(); id != 0 {
+		return ErrNotRoot
+	}
+	return nil
+}