diff --git a/src/libstore/binary-cache-store.cc b/src/libstore/binary-cache-store.cc
index 12d0c32fb..14584f0a2 100644
--- a/src/libstore/binary-cache-store.cc
+++ b/src/libstore/binary-cache-store.cc
@@ -504,18 +504,10 @@ void BinaryCacheStore::addSignatures(const StorePath & storePath, const StringSe
 
 std::optional<std::string> BinaryCacheStore::getBuildLog(const StorePath & path)
 {
-    auto drvPath = path;
-
-    if (!path.isDerivation()) {
-        try {
-            auto info = queryPathInfo(path);
-            // FIXME: add a "Log" field to .narinfo
-            if (!info->deriver) return std::nullopt;
-            drvPath = *info->deriver;
-        } catch (InvalidPath &) {
-            return std::nullopt;
-        }
-    }
+    auto maybePath = getBuildDerivationPath(path);
+    if (!maybePath)
+        return std::nullopt;
+    auto drvPath = maybePath.value();
 
     auto logPath = "log/" + std::string(baseNameOf(printStorePath(drvPath)));
 
diff --git a/src/libstore/local-fs-store.cc b/src/libstore/local-fs-store.cc
index c5ae7536f..3a0585b15 100644
--- a/src/libstore/local-fs-store.cc
+++ b/src/libstore/local-fs-store.cc
@@ -89,17 +89,10 @@ const std::string LocalFSStore::drvsLogDir = "drvs";
 
 std::optional<std::string> LocalFSStore::getBuildLog(const StorePath & path_)
 {
-    auto path = path_;
-
-    if (!path.isDerivation()) {
-        try {
-            auto info = queryPathInfo(path);
-            if (!info->deriver) return std::nullopt;
-            path = *info->deriver;
-        } catch (InvalidPath &) {
-            return std::nullopt;
-        }
-    }
+    auto maybePath = getBuildDerivationPath(path_);
+    if (!maybePath)
+        return std::nullopt;
+    auto path = maybePath.value();
 
     auto baseName = path.to_string();
 
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 8811ab578..ebd641aa4 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -1300,6 +1300,34 @@ Derivation readDerivationCommon(Store& store, const StorePath& drvPath, bool req
     }
 }
 
+std::optional<StorePath> Store::getBuildDerivationPath(const StorePath & path)
+{
+
+    if (!path.isDerivation()) {
+        try {
+            auto info = queryPathInfo(path);
+            if (!info->deriver) return std::nullopt;
+            return *info->deriver;
+        } catch (InvalidPath &) {
+            return std::nullopt;
+        }
+    }
+
+    if (!settings.isExperimentalFeatureEnabled(Xp::CaDerivations) || !isValidPath(path))
+        return path;
+
+    auto drv = readDerivation(path);
+    if (!derivationHasKnownOutputPaths(drv.type())) {
+        // The build log is actually attached to the corresponding
+        // resolved derivation, so we need to get it first
+        auto resolvedDrv = drv.tryResolve(*this);
+        if (resolvedDrv)
+            return writeDerivation(*this, *resolvedDrv, NoRepair, true);
+    }
+
+    return path;
+}
+
 Derivation Store::readDerivation(const StorePath & drvPath)
 { return readDerivationCommon(*this, drvPath, true); }
 
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 151ec10d6..88a11d953 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -618,6 +618,13 @@ public:
      */
     StorePathSet exportReferences(const StorePathSet & storePaths, const StorePathSet & inputPaths);
 
+    /**
+     * Given a store path, return the realisation actually used in the realisation of this path:
+     * - If the path is a content-addressed derivation, try to resolve it
+     * - Otherwise, find one of its derivers
+     */
+    std::optional<StorePath> getBuildDerivationPath(const StorePath &);
+
     /* Hack to allow long-running processes like hydra-queue-runner to
        occasionally flush their path info cache. */
     void clearPathInfoCache()
diff --git a/tests/build-hook-ca-floating.nix b/tests/build-hook-ca-floating.nix
index 67295985f..dfdbb82da 100644
--- a/tests/build-hook-ca-floating.nix
+++ b/tests/build-hook-ca-floating.nix
@@ -1,53 +1,6 @@
 { busybox }:
 
-with import ./config.nix;
-
-let
-
-  mkDerivation = args:
-    derivation ({
-      inherit system;
-      builder = busybox;
-      args = ["sh" "-e" args.builder or (builtins.toFile "builder-${args.name}.sh" "if [ -e .attrs.sh ]; then source .attrs.sh; fi; eval \"$buildCommand\"")];
-      outputHashMode = "recursive";
-      outputHashAlgo = "sha256";
-      __contentAddressed = true;
-    } // removeAttrs args ["builder" "meta"])
-    // { meta = args.meta or {}; };
-
-  input1 = mkDerivation {
-    shell = busybox;
-    name = "build-remote-input-1";
-    buildCommand = "echo FOO > $out";
-    requiredSystemFeatures = ["foo"];
-  };
-
-  input2 = mkDerivation {
-    shell = busybox;
-    name = "build-remote-input-2";
-    buildCommand = "echo BAR > $out";
-    requiredSystemFeatures = ["bar"];
-  };
-
-  input3 = mkDerivation {
-    shell = busybox;
-    name = "build-remote-input-3";
-    buildCommand = ''
-      read x < ${input2}
-      echo $x BAZ > $out
-    '';
-    requiredSystemFeatures = ["baz"];
-  };
-
-in
-
-  mkDerivation {
-    shell = busybox;
-    name = "build-remote";
-    buildCommand =
-      ''
-        read x < ${input1}
-        read y < ${input3}
-        echo "$x $y" > $out
-      '';
-  }
+import ./build-hook.nix {
+  inherit busybox;
+  contentAddressed = true;
+}
diff --git a/tests/build-hook.nix b/tests/build-hook.nix
index 643334caa..7effd7903 100644
--- a/tests/build-hook.nix
+++ b/tests/build-hook.nix
@@ -1,15 +1,22 @@
-{ busybox }:
+{ busybox, contentAddressed ? false }:
 
 with import ./config.nix;
 
 let
 
+  caArgs = if contentAddressed then {
+      outputHashMode = "recursive";
+      outputHashAlgo = "sha256";
+      __contentAddressed = true;
+    } else {};
+
   mkDerivation = args:
     derivation ({
       inherit system;
       builder = busybox;
       args = ["sh" "-e" args.builder or (builtins.toFile "builder-${args.name}.sh" "if [ -e .attrs.sh ]; then source .attrs.sh; fi; eval \"$buildCommand\"")];
-    } // removeAttrs args ["builder" "meta" "passthru"])
+    } // removeAttrs args ["builder" "meta" "passthru"]
+    // caArgs)
     // { meta = args.meta or {}; passthru = args.passthru or {}; };
 
   input1 = mkDerivation {
diff --git a/tests/build-remote.sh b/tests/build-remote.sh
index e73c37ea4..25a482003 100644
--- a/tests/build-remote.sh
+++ b/tests/build-remote.sh
@@ -63,12 +63,9 @@ nix path-info --store $TEST_ROOT/machine3 --all \
   | grep builder-build-remote-input-3.sh
 
 
-# Temporarily disabled because of https://github.com/NixOS/nix/issues/6209
-if [[ -z "$CONTENT_ADDRESSED" ]]; then
-  for i in input1 input3; do
-    nix log --store $TEST_ROOT/machine0 --file "$file" --arg busybox $busybox passthru."$i" | grep hi-$i
-  done
-fi
+for i in input1 input3; do
+nix log --store $TEST_ROOT/machine0 --file "$file" --arg busybox $busybox passthru."$i" | grep hi-$i
+done
 
 # Behavior of keep-failed
 out="$(nix-build 2>&1 failing.nix \