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-rw-r--r--tvix/README.md5
-rw-r--r--tvix/build/default.nix12
-rw-r--r--tvix/castore/Cargo.toml2
-rw-r--r--tvix/castore/default.nix33
-rw-r--r--tvix/default.nix2
-rw-r--r--tvix/eval/default.nix13
-rw-r--r--tvix/glue/default.nix11
-rw-r--r--tvix/nix-compat/default.nix14
-rw-r--r--tvix/store/default.nix44
-rw-r--r--tvix/utils.nix23
10 files changed, 112 insertions, 47 deletions
diff --git a/tvix/README.md b/tvix/README.md
index fb536bc229c0..7f3fcc061597 100644
--- a/tvix/README.md
+++ b/tvix/README.md
@@ -104,6 +104,11 @@ Rust projects under `//tvix`, be sure to run
 `mg run //tools:crate2nix-generate` in `//tvix` itself and commit the changes
 to the generated `Cargo.nix` file. This only applies to the full TVL checkout.
 
+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`.
+
 ## License structure
 
 All code implemented for Tvix is licensed under the GPL-3.0, with the
diff --git a/tvix/build/default.nix b/tvix/build/default.nix
index a2a3bea0c5a5..aafab92fd525 100644
--- a/tvix/build/default.nix
+++ b/tvix/build/default.nix
@@ -1,5 +1,11 @@
-{ depot, pkgs, ... }:
+{ depot, lib, ... }:
 
-depot.tvix.crates.workspaceMembers.tvix-build.build.override {
+(depot.tvix.crates.workspaceMembers.tvix-build.build.override {
   runTests = true;
-}
+}).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 = [ "tonic-reflection" ];
+  };
+})
diff --git a/tvix/castore/Cargo.toml b/tvix/castore/Cargo.toml
index 4cbc29053b22..f80c5813c141 100644
--- a/tvix/castore/Cargo.toml
+++ b/tvix/castore/Cargo.toml
@@ -92,7 +92,7 @@ rstest_reuse = "0.6.0"
 xattr = "1.3.1"
 
 [features]
-default = []
+default = ["cloud"]
 cloud = [
   "dep:bigtable_rs",
   "object_store/aws",
diff --git a/tvix/castore/default.nix b/tvix/castore/default.nix
index 641d88376072..03a12b6c2016 100644
--- a/tvix/castore/default.nix
+++ b/tvix/castore/default.nix
@@ -1,23 +1,28 @@
-{ depot, pkgs, ... }:
+{ depot, pkgs, lib, ... }:
 
 (depot.tvix.crates.workspaceMembers.tvix-castore.build.override {
   runTests = true;
   testPreRun = ''
     export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt;
   '';
-
-  # enable some optional features.
-  features = [ "default" "cloud" ];
-}).overrideAttrs (_: {
-  meta.ci.targets = [ "integration-tests" ];
-  passthru.integration-tests = depot.tvix.crates.workspaceMembers.tvix-castore.build.override {
-    runTests = true;
-    testPreRun = ''
-      export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt;
-      export PATH="$PATH:${pkgs.lib.makeBinPath [pkgs.cbtemulator pkgs.google-cloud-bigtable-tool]}"
+}).overrideAttrs (old: rec {
+  meta.ci.targets = [ "integration-tests" ] ++ lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
+  passthru = (depot.tvix.utils.mkFeaturePowerset {
+    inherit (old) crateName;
+    features = ([ "cloud" "fuse" "tonic-reflection" ]
+      # virtiofs feature currently fails to build on Darwin
+      ++ lib.optional pkgs.stdenv.isLinux "virtiofs");
+    override.testPreRun = ''
+      export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
     '';
-
-    # enable some optional features.
-    features = [ "default" "cloud" "integration" ];
+  }) // {
+    integration-tests = depot.tvix.crates.workspaceMembers.${old.crateName}.build.override (old: {
+      runTests = true;
+      testPreRun = ''
+        export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt;
+        export PATH="$PATH:${pkgs.lib.makeBinPath [ pkgs.cbtemulator pkgs.google-cloud-bigtable-tool ]}"
+      '';
+      features = old.features ++ [ "integration" ];
+    });
   };
 })
diff --git a/tvix/default.nix b/tvix/default.nix
index cffea7b95487..9a362658c8d3 100644
--- a/tvix/default.nix
+++ b/tvix/default.nix
@@ -293,4 +293,6 @@ in
     "shell"
     "rust-docs"
   ];
+
+  utils = import ./utils.nix { inherit lib depot; };
 }
diff --git a/tvix/eval/default.nix b/tvix/eval/default.nix
index 91661291f7b6..9dd5875f85a5 100644
--- a/tvix/eval/default.nix
+++ b/tvix/eval/default.nix
@@ -1,9 +1,16 @@
 # TODO: find a way to build the benchmarks via crate2nix
-{ depot, pkgs, ... }:
+{ depot, pkgs, lib, ... }:
 
-depot.tvix.crates.workspaceMembers.tvix-eval.build.override {
+(depot.tvix.crates.workspaceMembers.tvix-eval.build.override {
   runTests = true;
 
   # Make C++ Nix available, to compare eval results against.
   testInputs = [ pkgs.nix ];
-}
+}).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 = [ "nix_tests" ];
+    override.testInputs = [ pkgs.nix ];
+  };
+})
diff --git a/tvix/glue/default.nix b/tvix/glue/default.nix
index 08f5c2228d76..14c7e214f25b 100644
--- a/tvix/glue/default.nix
+++ b/tvix/glue/default.nix
@@ -1,8 +1,17 @@
-{ depot, pkgs, ... }:
+{ depot, pkgs, lib, ... }:
 
 (depot.tvix.crates.workspaceMembers.tvix-glue.build.override {
   runTests = true;
   testPreRun = ''
     export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt;
   '';
+}).overrideAttrs (old: rec {
+  meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
+  passthru = depot.tvix.utils.mkFeaturePowerset {
+    inherit (old) crateName;
+    features = [ "nix_tests" ];
+    override.testPreRun = ''
+      export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt;
+    '';
+  };
 })
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" ];
+  };
+})
diff --git a/tvix/store/default.nix b/tvix/store/default.nix
index ad47994f2446..78b499114cae 100644
--- a/tvix/store/default.nix
+++ b/tvix/store/default.nix
@@ -1,4 +1,4 @@
-{ depot, pkgs, ... }:
+{ depot, pkgs, lib, ... }:
 
 let
   mkImportCheck = p: expectedPath: {
@@ -22,31 +22,35 @@ let
   };
 in
 
-(depot.tvix.crates.workspaceMembers.tvix-store.build.override {
+(depot.tvix.crates.workspaceMembers.tvix-store.build.override (old: {
   runTests = true;
   testPreRun = ''
     export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
   '';
-
-  # enable some optional features.
-  features = [ "default" "cloud" ]
-    # virtiofs feature currently fails to build on Darwin.
-    ++ pkgs.lib.optional pkgs.stdenv.isLinux "virtiofs";
-}).overrideAttrs (_: {
-  meta.ci.targets = [ "integration-tests" ];
-  meta.ci.extraSteps = {
-    import-docs = (mkImportCheck "tvix/store/docs" ./docs);
+  features = old.features
+    # virtiofs feature currently fails to build on Darwin
+    ++ lib.optional pkgs.stdenv.isLinux "virtiofs";
+})).overrideAttrs (old: rec {
+  meta.ci = {
+    targets = [ "integration-tests" ] ++ lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
+    extraSteps.import-docs = (mkImportCheck "tvix/store/docs" ./docs);
   };
-  passthru.integration-tests = depot.tvix.crates.workspaceMembers.tvix-store.build.override {
-    runTests = true;
-    testPreRun = ''
+  passthru = (depot.tvix.utils.mkFeaturePowerset {
+    inherit (old) crateName;
+    features = ([ "cloud" "fuse" "otlp" "tonic-reflection" ]
+      # virtiofs feature currently fails to build on Darwin
+      ++ lib.optional pkgs.stdenv.isLinux "virtiofs");
+    override.testPreRun = ''
       export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
-      export PATH="$PATH:${pkgs.lib.makeBinPath [pkgs.cbtemulator pkgs.google-cloud-bigtable-tool]}"
     '';
-
-    # enable some optional features.
-    features = [ "default" "cloud" "integration" ]
-      # virtiofs feature currently fails to build on Darwin.
-      ++ pkgs.lib.optional pkgs.stdenv.isLinux "virtiofs";
+  }) // {
+    integration-tests = depot.tvix.crates.workspaceMembers.${old.crateName}.build.override (old: {
+      runTests = true;
+      testPreRun = ''
+        export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt;
+        export PATH="$PATH:${pkgs.lib.makeBinPath [ pkgs.cbtemulator pkgs.google-cloud-bigtable-tool ]}"
+      '';
+      features = old.features ++ [ "integration" ];
+    });
   };
 })
diff --git a/tvix/utils.nix b/tvix/utils.nix
new file mode 100644
index 000000000000..ed751566bd9c
--- /dev/null
+++ b/tvix/utils.nix
@@ -0,0 +1,23 @@
+{ lib, depot, ... }:
+
+{
+  mkFeaturePowerset = { crateName, features, override ? { } }:
+    let
+      powerset = xs:
+        let
+          addElement = set: element:
+            set ++ map (e: [ element ] ++ e) set;
+        in
+        lib.foldl' addElement [ [ ] ] xs;
+    in
+    lib.listToAttrs (map
+      (featuresPowerset: {
+        name = if featuresPowerset != [ ] then "with-features-${lib.concatStringsSep "-" featuresPowerset}" else "no-features";
+        value = depot.tvix.crates.workspaceMembers.${crateName}.build.override (old: {
+          runTests = true;
+          features = featuresPowerset;
+        } // (if lib.isFunction override then override old else override)
+        );
+      })
+      (powerset features));
+}
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