diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..a96f8f547
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+.tag            export-subst
+.gitignore      export-ignore
+.gitattributes  export-ignore
diff --git a/.tag b/.tag
new file mode 100644
index 000000000..6828f88dc
--- /dev/null
+++ b/.tag
@@ -0,0 +1 @@
+$Format:%H$