Release 3.13.2 (2025-11-19)

What's Changed

Abbreviate flakerefs in lockfile diffs and nix flake metadata

Flake refs are now abbreviated when possible, to reduce visual clutter.

For example, this changes

• Updated input 'blender-bin':
    'https://api.flakehub.com/f/pinned/edolstra/blender-bin/1.0.19/01993ca7-2aa8-746f-96f5-ca8d2c2b962d/source.tar.gz?narHash=sha256-ZqVhVl9UYVErF8HW8lcvqss005VWYjuX//rZ%2BOmXyHg%3D' (2025-09-12)
  → 'https://api.flakehub.com/f/pinned/edolstra/blender-bin/1.0.20/019a8772-b044-7738-8c03-109bdc9f0a01/source.tar.gz?narHash=sha256-sVj9Gmx0kwTDQPJ5kgQYszE3Hdjevu0zx0b/bL2fyUc%3D' (2025-11-15)
• Updated input 'nix':
    'github:DeterminateSystems/nix-src/236ebef6514f3a2a9765c8a1d80dd503b8e672be?narHash=sha256-s6/Err0yqOp5fM3OdCF1vhmEYpeElbPOWX88YrW2qj4%3D' (2025-10-23)
  → 'github:DeterminateSystems/nix-src/ef054dc06e9701597bce0b0572af18cb4c7e7277?narHash=sha256-uqYmH0KA8caQqX5u4BMarZsuDlC%2B71HRsH3h4f3DPCA%3D' (2025-11-12)

to

• Updated input 'blender-bin':
    'https://api.flakehub.com/f/pinned/edolstra/blender-bin/1.0.19/01993ca7-2aa8-746f-96f5-ca8d2c2b962d/source.tar.gz' (2025-09-12)
  → 'https://api.flakehub.com/f/pinned/edolstra/blender-bin/1.0.20/019a8772-b044-7738-8c03-109bdc9f0a01/source.tar.gz' (2025-11-15)
• Updated input 'nix':
    'github:DeterminateSystems/nix-src/236ebef' (2025-10-23)
  → 'github:DeterminateSystems/nix-src/ef054dc' (2025-11-12)

PR: DeterminateSystems/nix-src#264

nix flake prefetch-inputs now skips build-time inputs

Build-time inputs can already be fetched in parallel, so prefetching them is usually not what you want.

This can be especially noticeable in projects that make extensive use of build-time flake inputs.

PR: DeterminateSystems/nix-src#263

Don't compute revCount/lastModified if they're already specified

We don't care if the user (or more likely the lock file) specifies an incorrect value for these attributes, since it doesn't matter for security (unlike content hashes like narHash).

This can save time when operating on large repos -- having to recalculate these attributes could slow things down greatly.

PR: DeterminateSystems/nix-src#269

Avoid unnecessary Git refetches

This fixes the issue where updating a Git input does a non-shallow fetch, and then a subsequent eval does a shallow refetch because the revCount is already known.

Now the subsequent eval will reuse the repo used in the first fetch.

PR: DeterminateSystems/nix-src#270

Use our mirrored flake registry

The flake registry is security-critical and thus should have high availability.

By mirroring the upstream Nix flake registry, we can make it less likely that a GitHub outage affects being able to resolve from the registry.

PR: DeterminateSystems/nix-src#271

Full Changelog: v3.13.1...v3.13.2