forked from mirrors/nixpkgs
d1b6d2d0ab
Packages built with `haskellPackages.callHackage` won't be rebuilt when updating `all-cabal-hashes`. The removed comment was keeping a reference to the `cabal2nix` call, which itself depends on `all-cabal-hashes`, in order to keep this file during a garbage collection. The tradeoff is between: - The current behavior: a mass rebuild, any change of `all-cabal-hashes` triggers a rebuild of all the packages built with `callHackage` and packages which depend on them. This can take hours, and may happen after a "small" unrelated change (i.e. an user is bumping `all-cabal-hashes` in order to use a new package from hackage). It also have global impacts in a project (long rebuild in CI, new entries in cache, developers need to fetch the new entries, ...). In this context, `cabal2nix` entries are not garbage collected. - The new behavior: No mass rebuild, but `cabal2nix` derivations need to be recomputed after a garbage collection. This is usually fast (a few seconds by call), linear with the number of calls and should not happen a lot (i.e. users are not garbage collecting everyday). See https://github.com/NixOS/nixpkgs/issues/194751 for details. |
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