libutil: remove dynamic derivations feature

Change-Id: Id48c775197e89bfda711c5cb03752980785c3d26

lix/libexpr/eval.cc

@@ -892,8 +892,7 @@ std::string EvalState::mkOutputStringRaw(
     std::optional<StorePath> optStaticOutputPath,
     const ExperimentalFeatureSettings & xpSettings)
 {
-    /* In practice, this is testing for the case of CA derivations, or
-       dynamic derivations. */
+    /* In practice, this is testing for the case of CA derivations. */
     return optStaticOutputPath
         ? ctx.store->printStorePath(std::move(*optStaticOutputPath))
         /* Downstream we would substitute this for an actual path once

lix/libstore/build/derivation-goal.cc

@@ -199,8 +199,6 @@ try {
     /* Get the derivation. It is probably in the eval store, but it might be inthe main store:
 
          - Resolved derivation are resolved against main store realisations, and so must be stored there.
-
-         - Dynamic derivations are built, and so are found in the main store.
      */
     for (auto * drvStore : { &worker.evalStore, &worker.store }) {
         if (TRY_AWAIT(drvStore->isValidPath(drvPath))) {

lix/libutil/config.cc

@@ -360,8 +360,6 @@ template<> ExperimentalFeatures BaseSetting<ExperimentalFeatures>::parse(const s
             if (*thisXpFeature == Xp::CaDerivations) {
                 static std::once_flag warned;
                 warnDeprecated294(warned, s);
-            } else if (*thisXpFeature == Xp::DynamicDerivations) {
-                throw Error("dynamic derivations are no longer supported");
             }
             res = res | thisXpFeature.value();
         } else

lix/libutil/experimental-features/dynamic-derivations.md

@@ -1,11 +0,0 @@
----
-name: dynamic-derivations
-internalName: DynamicDerivations
----
-Allow the use of a few things related to dynamic derivations:
-
-  - "text hashing" derivation outputs, so we can build .drv
-    files.
-
-  - dependencies in derivations on the outputs of
-    derivations that are themselves derivations outputs.

lix/libutil/meson.build

@@ -144,7 +144,6 @@ experimental_feature_definitions = files(
   'experimental-features/ca-derivations.md',
   'experimental-features/cgroups.md',
   'experimental-features/daemon-trust-override.md',
-  'experimental-features/dynamic-derivations.md',
   'experimental-features/fetch-closure.md',
   'experimental-features/flakes.md',
   'experimental-features/lix-custom-sub-commands.md',