diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b195acd8f..e34a03bd0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -29,6 +29,15 @@ on:
         required: false
         default: false
         type: boolean
+      publish_manual:
+        required: false
+        default: false
+        type: boolean
+    secrets:
+      manual_netlify_auth_token:
+        required: false
+      manual_netlify_site_id:
+        required: false
 
 jobs:
   build:
@@ -177,8 +186,10 @@ jobs:
       - uses: DeterminateSystems/determinate-nix-action@main
       - uses: DeterminateSystems/flakehub-cache-action@main
       - name: Build manual
+        if: inputs.system == 'x86_64-linux'
         run: nix build .#hydraJobs.manual
       - uses: nwtgck/actions-netlify@v3.0
+        if: inputs.publish_manual && inputs.system == 'x86_64-linux'
         with:
           publish-dir: "./result/share/doc/nix/manual"
           production-branch: detsys-main
@@ -192,8 +203,8 @@ jobs:
           enable-commit-status: true
           overwrites-pull-request-comment: true
         env:
-          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
-          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
+          NETLIFY_AUTH_TOKEN: ${{ secrets.manual_netlify_auth_token }}
+          NETLIFY_SITE_ID: ${{ secrets.manual_netlify_site_id }}
 
   success:
     needs:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c002d0b66..cca054183 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,6 +41,10 @@ jobs:
       run_tests: true
       run_vm_tests: true
       run_regression_tests: true
+      publish_manual: true
+    secrets:
+      manual_netlify_auth_token: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+      manual_netlify_site_id: ${{ secrets.NETLIFY_SITE_ID }}
 
   build_aarch64-linux:
     uses: ./.github/workflows/build.yml
@@ -59,6 +63,7 @@ jobs:
       runner: macos-latest-large
       runner_for_virt: macos-latest-large
       runner_small: macos-latest-large
+      run_tests: false
 
   build_aarch64-darwin:
     uses: ./.github/workflows/build.yml
diff --git a/.version b/.version
index 6a6900382..bcec02eeb 100644
--- a/.version
+++ b/.version
@@ -1 +1 @@
-2.30.0
+2.30.1
diff --git a/.version-determinate b/.version-determinate
index 7c69a55db..a08ffae0c 100644
--- a/.version-determinate
+++ b/.version-determinate
@@ -1 +1 @@
-3.7.0
+3.8.2
diff --git a/doc/manual/source/SUMMARY.md.in b/doc/manual/source/SUMMARY.md.in
index 00f231a6a..03a18f331 100644
--- a/doc/manual/source/SUMMARY.md.in
+++ b/doc/manual/source/SUMMARY.md.in
@@ -130,6 +130,9 @@
   - [Contributing](development/contributing.md)
 - [Determinate Nix Release Notes](release-notes-determinate/index.md)
   - [Changes between Nix and Determinate Nix](release-notes-determinate/changes.md)<!-- next -->
+  - [Release 3.8.2 (2025-07-12)](release-notes-determinate/rl-3.8.2.md)
+  - [Release 3.8.1 (2025-07-11)](release-notes-determinate/rl-3.8.1.md)
+  - [Release 3.8.0 (2025-07-10)](release-notes-determinate/rl-3.8.0.md)
   - [Release 3.7.0 (2025-07-03)](release-notes-determinate/rl-3.7.0.md)
   - [Release 3.6.8 (2025-06-25)](release-notes-determinate/rl-3.6.8.md)
   - [Release 3.6.7 (2025-06-24)](release-notes-determinate/rl-3.6.7.md)
diff --git a/doc/manual/source/release-notes-determinate/changes.md b/doc/manual/source/release-notes-determinate/changes.md
index 0d4b2b1ad..8c5f30770 100644
--- a/doc/manual/source/release-notes-determinate/changes.md
+++ b/doc/manual/source/release-notes-determinate/changes.md
@@ -1,6 +1,6 @@
 # Changes between Nix and Determinate Nix
 
-This section lists the differences between upstream Nix 2.29 and Determinate Nix 3.7.0.<!-- differences -->
+This section lists the differences between upstream Nix 2.30 and Determinate Nix 3.8.2.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -94,3 +94,19 @@ This section lists the differences between upstream Nix 2.29 and Determinate Nix
 * `nix store delete` now explains why deletion fails by @edolstra in [DeterminateSystems/nix-src#130](https://github.com/DeterminateSystems/nix-src/pull/130)
 
 * New command: `nix flake prefetch-inputs` for improved CI performance, by @edolstra in [DeterminateSystems/nix-src#127](https://github.com/DeterminateSystems/nix-src/pull/127)
+
+<!-- Determinate Nix version 3.8.0 -->
+
+* nix flake check: Skip substitutable derivations by @edolstra in [DeterminateSystems/nix-src#134](https://github.com/DeterminateSystems/nix-src/pull/134)
+
+* lockFlake(): When updating a lock, respect the input's lock file by @edolstra in [DeterminateSystems/nix-src#137](https://github.com/DeterminateSystems/nix-src/pull/137)
+
+<!-- Determinate Nix version 3.8.1 -->
+
+* Address ifdef problem with macOS/BSD sandboxing by @gustavderdrache in [DeterminateSystems/nix-src#142](https://github.com/DeterminateSystems/nix-src/pull/142)
+
+<!-- Determinate Nix version 3.8.2 -->
+
+* ci: don't run the full test suite for x86_64-darwin by @grahamc in [DeterminateSystems/nix-src#144](https://github.com/DeterminateSystems/nix-src/pull/144)
+
+* Try publishing the manual again by @grahamc in [DeterminateSystems/nix-src#145](https://github.com/DeterminateSystems/nix-src/pull/145)
diff --git a/doc/manual/source/release-notes-determinate/rl-3.8.0.md b/doc/manual/source/release-notes-determinate/rl-3.8.0.md
new file mode 100644
index 000000000..4103d6df9
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/rl-3.8.0.md
@@ -0,0 +1,29 @@
+# Release 3.8.0 (2025-07-10)
+
+* Based on [upstream Nix 2.30.0](../release-notes/rl-2.30.md).
+
+## What's Changed
+
+### Faster CI with `nix flake check`
+
+`nix flake check` no longer downloads flake outputs if no building is necessary.
+
+This command is intended to validate that a flake can fully evaluate and all outputs can build.
+If the outputs are available in a binary cache then both properties are confirmed to be true.
+Notably, downloading the output from the binary cache is not strictly necessary for the validation.
+
+Previously, `nix flake check` would download a flake output if the full build is available in a binary cache.
+
+Some users will find this change significantly reduces costly bandwidth and CI workflow time.
+
+PR: [DeterminateSystems/nix-src#134](https://github.com/DeterminateSystems/nix-src/pull/134)
+
+### Improved flake locking of transitive dependencies
+
+Determinate Nix now re-locks all transitive dependencies when changing a flake input's source URL.
+
+This fixes an issue where in some scenarios Nix would not re-lock those inputs and incorrectly use the old inputs' dependencies.
+
+PR: [DeterminateSystems/nix-src#137](https://github.com/DeterminateSystems/nix-src/pull/137)
+
+**Full Changelog**: [v3.7.0...v3.8.0](https://github.com/DeterminateSystems/nix-src/compare/v3.7.0...v3.8.0)
diff --git a/doc/manual/source/release-notes-determinate/rl-3.8.1.md b/doc/manual/source/release-notes-determinate/rl-3.8.1.md
new file mode 100644
index 000000000..90dc328f6
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/rl-3.8.1.md
@@ -0,0 +1,9 @@
+# Release 3.8.1 (2025-07-11)
+
+* Based on [upstream Nix 2.30.0](../release-notes/rl-2.30.md).
+
+## What's Changed
+* Address ifdef problem with macOS/BSD sandboxing by @gustavderdrache in [DeterminateSystems/nix-src#142](https://github.com/DeterminateSystems/nix-src/pull/142)
+
+
+**Full Changelog**: [v3.8.0...v3.8.1](https://github.com/DeterminateSystems/nix-src/compare/v3.8.0...v3.8.1)
diff --git a/doc/manual/source/release-notes-determinate/rl-3.8.2.md b/doc/manual/source/release-notes-determinate/rl-3.8.2.md
new file mode 100644
index 000000000..638d90f68
--- /dev/null
+++ b/doc/manual/source/release-notes-determinate/rl-3.8.2.md
@@ -0,0 +1,10 @@
+# Release 3.8.2 (2025-07-12)
+
+* Based on [upstream Nix 2.30.0](../release-notes/rl-2.30.md).
+
+## What's Changed
+* ci: don't run the full test suite for x86_64-darwin by @grahamc in [DeterminateSystems/nix-src#144](https://github.com/DeterminateSystems/nix-src/pull/144)
+* Try publishing the manual again by @grahamc in [DeterminateSystems/nix-src#145](https://github.com/DeterminateSystems/nix-src/pull/145)
+
+
+**Full Changelog**: [v3.8.1...v3.8.2](https://github.com/DeterminateSystems/nix-src/compare/v3.8.1...v3.8.2)
diff --git a/docker.nix b/docker.nix
index ac047b4d6..ca7a81c1f 100644
--- a/docker.nix
+++ b/docker.nix
@@ -184,11 +184,14 @@ let
       } " = ";
     };
 
-  nixConfContents = toConf {
-    sandbox = false;
-    build-users-group = "nixbld";
-    trusted-public-keys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
-  };
+  nixConfContents = toConf (
+    {
+      sandbox = false;
+      build-users-group = "nixbld";
+      trusted-public-keys = [ "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" ];
+    }
+    // nixConf
+  );
 
   userHome = if uid == 0 then "/root" else "/home/${uname}";
 
diff --git a/scripts/install-multi-user.sh b/scripts/install-multi-user.sh
index f051ccc46..e9ddfc014 100644
--- a/scripts/install-multi-user.sh
+++ b/scripts/install-multi-user.sh
@@ -834,8 +834,13 @@ install_from_extracted_nix() {
     (
         cd "$EXTRACTED_NIX_PATH"
 
-        _sudo "to copy the basic Nix files to the new store at $NIX_ROOT/store" \
-              cp -RPp ./store/* "$NIX_ROOT/store/"
+        if is_os_darwin; then
+            _sudo "to copy the basic Nix files to the new store at $NIX_ROOT/store" \
+                  cp -RPp ./store/* "$NIX_ROOT/store/"
+        else
+            _sudo "to copy the basic Nix files to the new store at $NIX_ROOT/store" \
+                  cp -RP --preserve=ownership,timestamps ./store/* "$NIX_ROOT/store/"
+        fi
 
         _sudo "to make the new store non-writable at $NIX_ROOT/store" \
               chmod -R ugo-w "$NIX_ROOT/store/"
diff --git a/scripts/install-nix-from-tarball.sh b/scripts/install-nix-from-tarball.sh
index 8d127a9c5..ec3264793 100644
--- a/scripts/install-nix-from-tarball.sh
+++ b/scripts/install-nix-from-tarball.sh
@@ -167,7 +167,11 @@ for i in $(cd "$self/store" >/dev/null && echo ./*); do
         rm -rf "$i_tmp"
     fi
     if ! [ -e "$dest/store/$i" ]; then
-        cp -RPp "$self/store/$i" "$i_tmp"
+        if [ "$(uname -s)" = "Darwin" ]; then
+            cp -RPp "$self/store/$i" "$i_tmp"
+        else
+            cp -RP --preserve=ownership,timestamps "$self/store/$i" "$i_tmp"
+        fi
         chmod -R a-w "$i_tmp"
         chmod +w "$i_tmp"
         mv "$i_tmp" "$dest/store/$i"
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 054b51564..2baed9bca 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -1609,7 +1609,7 @@ void EvalState::callFunction(Value & fun, std::span<Value *> args, Value & vRes,
                                              symbols[i.name])
                                     .atPos(lambda.pos)
                                     .withTrace(pos, "from call site")
-                                    .withFrame(*fun.lambda().env, lambda)
+                                    .withFrame(*vCur.lambda().env, lambda)
                                     .debugThrow();
                         }
                         env2.values[displ++] = i.def->maybeThunk(*this, env2);
@@ -1636,7 +1636,7 @@ void EvalState::callFunction(Value & fun, std::span<Value *> args, Value & vRes,
                                 .atPos(lambda.pos)
                                 .withTrace(pos, "from call site")
                                 .withSuggestions(suggestions)
-                                .withFrame(*fun.lambda().env, lambda)
+                                .withFrame(*vCur.lambda().env, lambda)
                                 .debugThrow();
                         }
                     unreachable();
diff --git a/src/libexpr/primops/fetchClosure.cc b/src/libexpr/primops/fetchClosure.cc
index fb17d71b9..e74c8484d 100644
--- a/src/libexpr/primops/fetchClosure.cc
+++ b/src/libexpr/primops/fetchClosure.cc
@@ -124,7 +124,7 @@ static void prim_fetchClosure(EvalState & state, const PosIdx pos, Value * * arg
     for (auto & attr : *args[0]->attrs()) {
         const auto & attrName = state.symbols[attr.name];
         auto attrHint = [&]() -> std::string {
-            return "while evaluating the '" + attrName + "' attribute passed to builtins.fetchClosure";
+            return fmt("while evaluating the attribute '%s' passed to builtins.fetchClosure", attrName);
         };
 
         if (attrName == "fromPath") {
diff --git a/src/libstore/unix/user-lock.cc b/src/libstore/unix/user-lock.cc
index 6a07cb7cc..f5d164e5b 100644
--- a/src/libstore/unix/user-lock.cc
+++ b/src/libstore/unix/user-lock.cc
@@ -197,7 +197,7 @@ bool useBuildUsers()
     #ifdef __linux__
     static bool b = (settings.buildUsersGroup != "" || settings.autoAllocateUids) && isRootUser();
     return b;
-    #elif defined(__APPLE__) && defined(__FreeBSD__)
+    #elif defined(__APPLE__) || defined(__FreeBSD__)
     static bool b = settings.buildUsersGroup != "" && isRootUser();
     return b;
     #else
diff --git a/tests/functional/lang/eval-fail-missing-arg-import.err.exp b/tests/functional/lang/eval-fail-missing-arg-import.err.exp
new file mode 100644
index 000000000..45774f003
--- /dev/null
+++ b/tests/functional/lang/eval-fail-missing-arg-import.err.exp
@@ -0,0 +1,12 @@
+error:
+       … from call site
+         at /pwd/lang/eval-fail-missing-arg-import.nix:1:1:
+            1| import ./non-eval-trivial-lambda-formals.nix { }
+             | ^
+            2|
+
+       error: function 'anonymous lambda' called without required argument 'a'
+       at /pwd/lang/non-eval-trivial-lambda-formals.nix:1:1:
+            1| { a }: a
+             | ^
+            2|
diff --git a/tests/functional/lang/eval-fail-missing-arg-import.nix b/tests/functional/lang/eval-fail-missing-arg-import.nix
new file mode 100644
index 000000000..7cb33f2b5
--- /dev/null
+++ b/tests/functional/lang/eval-fail-missing-arg-import.nix
@@ -0,0 +1 @@
+import ./non-eval-trivial-lambda-formals.nix { }
diff --git a/tests/functional/lang/eval-fail-undeclared-arg-import.err.exp b/tests/functional/lang/eval-fail-undeclared-arg-import.err.exp
new file mode 100644
index 000000000..ca797d3ec
--- /dev/null
+++ b/tests/functional/lang/eval-fail-undeclared-arg-import.err.exp
@@ -0,0 +1,13 @@
+error:
+       … from call site
+         at /pwd/lang/eval-fail-undeclared-arg-import.nix:1:1:
+            1| import ./non-eval-trivial-lambda-formals.nix {
+             | ^
+            2|   a = "a";
+
+       error: function 'anonymous lambda' called with unexpected argument 'b'
+       at /pwd/lang/non-eval-trivial-lambda-formals.nix:1:1:
+            1| { a }: a
+             | ^
+            2|
+       Did you mean a?
diff --git a/tests/functional/lang/eval-fail-undeclared-arg-import.nix b/tests/functional/lang/eval-fail-undeclared-arg-import.nix
new file mode 100644
index 000000000..e8454c725
--- /dev/null
+++ b/tests/functional/lang/eval-fail-undeclared-arg-import.nix
@@ -0,0 +1,4 @@
+import ./non-eval-trivial-lambda-formals.nix {
+  a = "a";
+  b = "b";
+}
diff --git a/tests/functional/lang/non-eval-trivial-lambda-formals.nix b/tests/functional/lang/non-eval-trivial-lambda-formals.nix
new file mode 100644
index 000000000..46a7ea4f4
--- /dev/null
+++ b/tests/functional/lang/non-eval-trivial-lambda-formals.nix
@@ -0,0 +1 @@
+{ a }: a
diff --git a/tests/nixos/github-flakes.nix b/tests/nixos/github-flakes.nix
index b93e35074..67e2d41e9 100644
--- a/tests/nixos/github-flakes.nix
+++ b/tests/nixos/github-flakes.nix
@@ -81,7 +81,7 @@ let
     mkdir -p $out/archive
 
     dir=NixOS-nixpkgs-${nixpkgs.shortRev}
-    cp -prd ${nixpkgs} $dir
+    cp -rd --preserve=ownership,timestamps ${nixpkgs} $dir
     # Set the correct timestamp in the tarball.
     find $dir -print0 | xargs -0 touch -h -t ${builtins.substring 0 12 nixpkgs.lastModifiedDate}.${
       builtins.substring 12 2 nixpkgs.lastModifiedDate
diff --git a/tests/nixos/sourcehut-flakes.nix b/tests/nixos/sourcehut-flakes.nix
index ff9a42dcd..5b40866d1 100644
--- a/tests/nixos/sourcehut-flakes.nix
+++ b/tests/nixos/sourcehut-flakes.nix
@@ -48,7 +48,7 @@ let
 
   nixpkgs-repo = pkgs.runCommand "nixpkgs-flake" { } ''
     dir=NixOS-nixpkgs-${nixpkgs.shortRev}
-    cp -prd ${nixpkgs} $dir
+    cp -rd --preserve=ownership,timestamps ${nixpkgs} $dir
 
     # Set the correct timestamp in the tarball.
     find $dir -print0 | xargs -0 touch -h -t ${builtins.substring 0 12 nixpkgs.lastModifiedDate}.${
diff --git a/tests/nixos/tarball-flakes.nix b/tests/nixos/tarball-flakes.nix
index fc2c5fe38..a68d64bfd 100644
--- a/tests/nixos/tarball-flakes.nix
+++ b/tests/nixos/tarball-flakes.nix
@@ -13,7 +13,7 @@ let
 
     set -x
     dir=nixpkgs-${nixpkgs.shortRev}
-    cp -prd ${nixpkgs} $dir
+    cp -rd --preserve=ownership,timestamps ${nixpkgs} $dir
     # Set the correct timestamp in the tarball.
     find $dir -print0 | xargs -0 touch -h -t ${builtins.substring 0 12 nixpkgs.lastModifiedDate}.${
       builtins.substring 12 2 nixpkgs.lastModifiedDate