Merge commit '9480bae337095fd24f61380bce3174fdfe926a00'

This is the last nixos-unstable release before 13b2903169f, which I'm a
bit nervous about.  So I want the update including that one to be as
small as possible, hence going to this one first.

1 files changed, 25 insertions, 0 deletions

diff --git a/nixpkgs/pkgs/development/interpreters/dhall/build-dhall-directory-package.nix b/nixpkgs/pkgs/development/interpreters/dhall/build-dhall-directory-package.nix
new file mode 100644
index 000000000000..b4401a85d141
--- /dev/null
+++ b/nixpkgs/pkgs/development/interpreters/dhall/build-dhall-directory-package.nix
@@ -0,0 +1,25 @@
+{ buildDhallPackage, lib }:
+
+# This is a minor variation on `buildDhallPackage` that splits the `code`
+# argument into `src` and `file` in such a way that you can easily override
+# the `file`
+#
+# This function is used by `dhall-to-nixpkgs` when given a directory
+lib.makeOverridable
+  ( { # Arguments passed through to `buildDhallPackage`
+      name
+    , dependencies ? []
+    , source ? false
+
+    , src
+    , # The file to import, relative to the root directory
+      file ? "package.dhall"
+    }:
+
+    buildDhallPackage {
+      inherit name dependencies source;
+
+      code = "${src}/${file}";
+    }
+  )
+