feat(tvix): add CI targets for checking crate features powerset r/8211

Closes: https://b.tvl.fyi/issues/401

With this change all crate features (and their combinations) will be built and
tested in CI.

From now on, when adding/removing a Cargo feature for a crate,
you will want to add it to the features power set that gets tested in CI.
For each crate there's a default.nix with a `mkFeaturePowerset` invocation,
modify the list to include/remove the feature.
Note that you don't want to add "collection" features,
such as `fs` for tvix-[ca]store or `default`.

Change-Id: I966dde1413d057770787da3296cce9c1924570e0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11717
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

1 files changed, 9 insertions, 5 deletions

diff --git a/tvix/nix-compat/default.nix b/tvix/nix-compat/default.nix
index 9df76e12fce1..08b053b77dd1 100644
--- a/tvix/nix-compat/default.nix
+++ b/tvix/nix-compat/default.nix
@@ -1,7 +1,11 @@
-{ depot, ... }:
+{ depot, lib, ... }:
 
-depot.tvix.crates.workspaceMembers.nix-compat.build.override {
+(depot.tvix.crates.workspaceMembers.nix-compat.build.override {
   runTests = true;
-  # make sure we also enable async here, so run the tests behind that feature flag.
-  features = [ "default" "async" "wire" ];
-}
+}).overrideAttrs (old: rec {
+  meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
+  passthru = depot.tvix.utils.mkFeaturePowerset {
+    inherit (old) crateName;
+    features = [ "async" "wire" ];
+  };
+})