Move call-flake.nix into libexpr

1 files changed, 22 insertions, 0 deletions

diff --git a/src/libexpr/flake/call-flake.nix b/src/libexpr/flake/call-flake.nix
new file mode 100644
index 000000000..c59a0c75f
--- /dev/null
+++ b/src/libexpr/flake/call-flake.nix
@@ -0,0 +1,22 @@
+locks: rootSrc: rootSubdir:
+
+let
+
+  callFlake = sourceInfo: subdir: locks:
+    let
+      flake = import (sourceInfo + "/" + subdir + "/flake.nix");
+
+      inputs = builtins.mapAttrs (n: v:
+        if v.flake or true
+        then callFlake (fetchTree (removeAttrs v.locked ["dir"])) (v.locked.dir or "") v.inputs
+        else fetchTree v.locked) locks;
+
+      outputs = flake.outputs (inputs // { self = result; });
+
+      result = outputs // sourceInfo // { inherit inputs; inherit outputs; inherit sourceInfo; };
+    in
+      assert flake.edition == 201909;
+
+      result;
+
+in callFlake rootSrc rootSubdir (builtins.fromJSON locks).inputs