refactor(ops/secrets): generalize out a mkSecrets function r/3453

Generalize out a reusable mkSecrets function from the
secrets-tree-building that's happening in //ops/secrets, so the same
thing can happen in other places in the depot (I want to use it for my
personal infrastructure).

Change-Id: I059295c8c257d78ad7fa0802859f57c2c105f29b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4679
Reviewed-by: grfn <grfn@gws.fyi>
Reviewed-by: zseri <zseri.devel@ytrizja.de>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

1 files changed, 19 insertions, 0 deletions

diff --git a/ops/secrets/mkSecrets.nix b/ops/secrets/mkSecrets.nix
new file mode 100644
index 0000000000..7a39a418a8
--- /dev/null
+++ b/ops/secrets/mkSecrets.nix
@@ -0,0 +1,19 @@
+# Expose secrets as part of the tree, making it possible to validate
+# their paths at eval time.
+#
+# Note that encrypted secrets end up in the Nix store, but this is
+# fine since they're publicly available anyways.
+{ depot, pkgs, ... }:
+path: secrets:
+
+let
+  inherit (builtins) attrNames listToAttrs;
+
+  # Import a secret to the Nix store
+  declareSecret = name: pkgs.runCommandNoCC name {} ''
+    cp ${path + "/${name}"} $out
+  '';
+in depot.nix.readTree.drvTargets (listToAttrs (
+  map (name: { inherit name; value = declareSecret name; })
+    (attrNames secrets)
+))