Better messaging for missing volume components on host to perform mount

pkg/volume/git_repo/git_repo.go

@@ -155,6 +155,13 @@ func (b *gitRepoVolumeMounter) GetAttributes() volume.Attributes {
 	}
 }
 
+// Checks prior to mount operations to verify that the required components (binaries, etc.)
+// to mount the volume are available on the underlying node.
+// If not, it returns an error
+func (b *gitRepoVolumeMounter) CanMount() error {
+	return nil
+}
+
 // SetUp creates new directory and clones a git repo.
 func (b *gitRepoVolumeMounter) SetUp(fsGroup *int64) error {
 	return b.SetUpAt(b.GetPath(), fsGroup)