Merge pull request #133 from DeterminateSystems/release-v3.7.0/e7308877-4039-4616-be6c-4613680cf30f

Release v3.7.0

.version-determinate

@@ -1 +1 @@
-3.6.8
+3.7.0

doc/manual/source/SUMMARY.md.in

@@ -129,6 +129,7 @@
   - [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 3.7.0 (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)
   - [Release 3.6.6 (2025-06-17)](release-notes-determinate/rl-3.6.6.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 3.6.8.<!-- differences -->
+This section lists the differences between upstream Nix 2.29 and Determinate Nix 3.7.0.<!-- differences -->
 
 * In Determinate Nix, flakes are stable. You no longer need to enable the `flakes` experimental feature.
 
@@ -86,3 +86,11 @@ This section lists the differences between upstream Nix 2.29 and Determinate Nix
 * Sync 2.29.1 by @edolstra in [DeterminateSystems/nix-src#124](https://github.com/DeterminateSystems/nix-src/pull/124)
 
 * Release v3.6.7 by @github-actions in [DeterminateSystems/nix-src#126](https://github.com/DeterminateSystems/nix-src/pull/126)
+
+<!-- Determinate Nix version 3.7.0 -->
+
+* Overriding deeply-nested transitive flake inputs now works, by @edolstra in [DeterminateSystems/nix-src#108](https://github.com/DeterminateSystems/nix-src/pull/108)
+
+* `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)

doc/manual/source/release-notes-determinate/rl-3.7.0.md

@@ -0,0 +1,63 @@
+# Release 3.7.0 (2025-07-03)
+
+- Based on [upstream Nix 2.29.1](../release-notes/rl-2.29.md).
+
+## What's Changed
+
+### Prefetch flake inputs in parallel
+
+By @edolstra in [DeterminateSystems/nix-src#127](https://github.com/DeterminateSystems/nix-src/pull/127)
+
+This release brings the command `nix flake prefetch-inputs`.
+
+Flake inputs are typically fetched "just in time."
+That means Nix fetches a flake input when the evaluator needs it, and not before.
+When the evaluator needs an input, evaluation is paused until the source is available.
+
+This causes a significant slow-down on projects with lots of flake inputs.
+
+The new command `nix flake prefetch-inputs` fetches all flake inputs in parallel.
+We expect running this new command before building will dramatically improve evaluation performance for most projects, especially in CI.
+Note that projects which with many unused flake inputs may not benefit from this change, since the new command fetches every input whether they're used or not.
+
+### Deep flake input overrides now work as expected
+
+By @edolstra in [DeterminateSystems/nix-src#108](https://github.com/DeterminateSystems/nix-src/pull/108)
+
+An override like:
+
+```
+inputs.foo.inputs.bar.inputs.nixpkgs.follows = "nixpkgs";
+```
+
+implicitly set `inputs.foo.inputs.bar` to `flake:bar`, which led to an unexpected error like:
+
+```
+error: cannot find flake 'flake:bar' in the flake registries
+```
+
+We now no longer create a parent override (like for `foo.bar` in the example above) if it doesn't set an explicit ref or follows attribute.
+We only recursively apply its child overrides.
+
+### `nix store delete` now shows you why deletion was not possible
+
+By @edolstra in [DeterminateSystems/nix-src#130](https://github.com/DeterminateSystems/nix-src/pull/130)
+
+For example:
+
+```
+error: Cannot delete path '/nix/store/6fcrjgfjip2ww3sx51rrmmghfsf60jvi-patchelf-0.14.3'
+  because it's referenced by the GC root '/home/eelco/Dev/nix-master/build/result'.
+
+error: Cannot delete path '/nix/store/rn0qyn3kmky26xgpr2n10vr787g57lff-cowsay-3.8.4'
+  because it's referenced by the GC root '/proc/3600568/environ'.
+
+error: Cannot delete path '/nix/store/klyng5rpdkwi5kbxkncy4gjwb490dlhb-foo.drv'
+  because it's in use by '{nix-process:3605324}'.
+```
+
+### Lazy-tree improvements
+
+- Improved lazy-tree evaluation caching for flakes accessed with a `path` flakeref by @edolstra in [DeterminateSystems/nix-src#131](https://github.com/DeterminateSystems/nix-src/pull/131)
+
+**Full Changelog**: [v3.6.8...v3.7.0](https://github.com/DeterminateSystems/nix-src/compare/v3.6.8...v3.7.0)