1 files changed, 20 insertions, 0 deletions
diff --git a/lib/flake-version-info.nix b/lib/flake-version-info.nix
new file mode 100644
index 000000000000..de15be94bee8
--- /dev/null
+++ b/lib/flake-version-info.nix
@@ -0,0 +1,20 @@
+# This function produces a lib overlay to be used by the nixpkgs
+# & nixpkgs/lib flakes to provide meaningful values for
+# `lib.trivial.version` et al..
+#
+# Internal and subject to change, don't use this anywhere else!
+# Instead, consider using a public interface, such as this flake here
+# in this directory, `lib/`, or use the nixpkgs flake, which applies
+# this logic for you in its `lib` output attribute.
+
+self: # from the flake
+
+finalLib: prevLib: # lib overlay
+
+{
+  trivial = prevLib.trivial // {
+    versionSuffix =
+      ".${finalLib.substring 0 8 (self.lastModifiedDate or "19700101")}.${self.shortRev or "dirty"}";
+    revisionWithDefault = default: self.rev or default;
+  };
+}