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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. Fixes NixOS#8325, #95, NixOS#12083, NixOS#5790.
Taken from NixOS#6621. Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
Having both doesn't make sense so it's best to disallow it. If this causes issues we could turn into a warning.
cole-h
reviewed
Jun 19, 2025
| OverrideTarget { | ||
| .input = inputOverride, | ||
| .sourcePath = sourcePath, | ||
| .parentInputAttrPath = inputAttrPathPrefix |
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Should this also be changed to prefix like line 472 above was?
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I think this is correct because it's the input attr path used to resolve relative path inputs. In an override, these should refer to the attr path of the overriding flake, which is inputAttrPathPrefix.
cole-h
approved these changes
Jun 25, 2025
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Motivation
An override like
implicitly set
inputs.foo.inputs.bartoflake:bar, which led to an unexpected error likeWe now no longer create a parent override (like for
foo.barin the example above) if it doesn't set an explicit ref or follows attribute. We only recursively apply its child overrides.Fixes NixOS#8325, #95, NixOS#12083, NixOS#5790. Based in part on NixOS#6621 by @Kha.
Also, we now disallow having both a flakeref and a follows attribute on an input, since it doesn't make sense to have both.
Context