1 files changed, 12 insertions, 5 deletions
diff --git a/vendor/github.com/opencontainers/runc/libcontainer/configs/config_linux.go b/vendor/github.com/opencontainers/runc/libcontainer/configs/config_linux.go
index 07da10804..8c02848b7 100644
--- a/vendor/github.com/opencontainers/runc/libcontainer/configs/config_linux.go
+++ b/vendor/github.com/opencontainers/runc/libcontainer/configs/config_linux.go
@@ -1,17 +1,24 @@
 package configs
 
-import "fmt"
+import "errors"
+
+var (
+	errNoUIDMap   = errors.New("User namespaces enabled, but no uid mappings found.")
+	errNoUserMap  = errors.New("User namespaces enabled, but no user mapping found.")
+	errNoGIDMap   = errors.New("User namespaces enabled, but no gid mappings found.")
+	errNoGroupMap = errors.New("User namespaces enabled, but no group mapping found.")
+)
 
 // HostUID gets the translated uid for the process on host which could be
 // different when user namespaces are enabled.
 func (c Config) HostUID(containerId int) (int, error) {
 	if c.Namespaces.Contains(NEWUSER) {
 		if c.UidMappings == nil {
-			return -1, fmt.Errorf("User namespaces enabled, but no uid mappings found.")
+			return -1, errNoUIDMap
 		}
 		id, found := c.hostIDFromMapping(containerId, c.UidMappings)
 		if !found {
-			return -1, fmt.Errorf("User namespaces enabled, but no user mapping found.")
+			return -1, errNoUserMap
 		}
 		return id, nil
 	}
@@ -30,11 +37,11 @@ func (c Config) HostRootUID() (int, error) {
 func (c Config) HostGID(containerId int) (int, error) {
 	if c.Namespaces.Contains(NEWUSER) {
 		if c.GidMappings == nil {
-			return -1, fmt.Errorf("User namespaces enabled, but no gid mappings found.")
+			return -1, errNoGIDMap
 		}
 		id, found := c.hostIDFromMapping(containerId, c.GidMappings)
 		if !found {
-			return -1, fmt.Errorf("User namespaces enabled, but no group mapping found.")
+			return -1, errNoGroupMap
 		}
 		return id, nil
 	}