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The `substituters` option in `nix.settings` uses the order of the substituters listed to define priority. Prior to https://github.com/NixOS/nixpkgs/pull/139075, the corresponding option `binaryCaches` is declared in the `nix` namespace, which is guaranteed to be merged last. However, the order of merging isn't guaranteed in submodules. This cause definitions to be appended to the default value instead of prepended, breaking backwards compatibility as reported in https://github.com/NixOS/nixpkgs/issues/158356. The way this is addressed in the module system is with order priorities via `mkOrder` and sorting definitions before merging. This PR restores the previous behavior by setting a higher priority to the substituters option defined internally, thus all definitions with default priority will be merged before it. This was chosen because the `mkRenamedOption` function does not preserve order priority so users using legacy options do not have precise control on placement. This change should suffice for simple configuration, but further revision to the module system is needed for to make various `mk*` functions aware of order priorities. |
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| maintainers | ||
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| default.nix | ||
| README | ||
| release-combined.nix | ||
| release-small.nix | ||
| release.nix | ||
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.