Merge pull request #140 from DeterminateSystems/release-v3.8.0/5087c9ef-5c71-4e74-ab80-c4344c05847c

Release v3.8.0

.version-determinate

@@ -1 +1 @@
-3.7.0
+3.8.0

doc/manual/source/SUMMARY.md.in

@@ -130,6 +130,7 @@
   - [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 3.8.0 (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)

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 3.8.0.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -94,3 +94,9 @@ 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)

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)