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When maintainers override stages of `fetchgit' (e.g. `postPatch`) it is very easy for them to accidentally leak the outpath-hash of their current `stdenv` into `fetchgit''s output, and therefore into the value they paste into `sha256`. This is a problem, because the resulting expression will break whenever any change is made to `stdenv` or when anybody attempts to build the expression on a different platform than the one used by the original maintainer. Almost as much of a problem is the fact that CI **does not catch** these problems. The `fetchgit` is run only once, then its output goes into cachix, and all future builds (hydra, CI, ofborg) pull from cachix. Let's offer maintainers the option to check that they aren't making this mistake, by passing through `allowedRequisites`. The default value is `null`, but it might be worth changing that at some point in the future. It is also sometimes difficult to communicate to package maintainers why their expression is problematic. Having `allowedRequisites` passed through makes it easier to do this: "look, when I switch on `allowedRequisites` your package breaks; are you sure you meant to hardcode the hash today's `x86_64-linux.stdenv` into your expression?` For an example use case, see https://github.com/NixOS/nixpkgs/pull/171223 The issue above is part of a larger problem with nixpkgs infra: there large parts of cachix cannot be reproduced easily if they are lost. Once something ends goes into cachix, we never ever again reverify the procedure by which it was placed into cachix. |
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| builder.sh | ||
| default.nix | ||
| deterministic-git | ||
| nix-prefetch-git | ||
| tests.nix | ||