1 files changed, 24 insertions, 0 deletions
diff --git a/pkgs/populate/program.nix b/pkgs/populate/program.nix
new file mode 100644
index 0000000..06cfa07
--- /dev/null
+++ b/pkgs/populate/program.nix
@@ -0,0 +1,24 @@
+# The program delivering sources, built from the crate in this directory.
+{ rustPlatform }:
+
+let
+  cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+in
+
+rustPlatform.buildRustPackage {
+  pname = cargoToml.package.name;
+  inherit (cargoToml.package) version;
+  # Only what cargo builds from, so changes to the Nix files or the docs
+  # don't rebuild the program.
+  src = builtins.path {
+    name = "populate-src";
+    path = ./.;
+    filter = path: type: let
+      relative = builtins.substring
+        (builtins.stringLength (toString ./.) + 1) (-1) (toString path);
+    in
+      builtins.elem relative [ "Cargo.toml" "Cargo.lock" "src" ] ||
+      builtins.substring 0 4 relative == "src/";
+  };
+  cargoLock.lockFile = ./Cargo.lock;
+}