diff options
| author | Guillaume Bouchard <guillaum.bouchard@gmail.com> | 2022-10-06 15:38:12 +0200 |
|---|---|---|
| committer | sternenseemann <sternenseemann@systemli.org> | 2022-11-26 19:00:56 +0100 |
| commit | d1b6d2d0ab89b4a5e58d0020500445b0c9c73a4e (patch) | |
| tree | d9f19a84e9440c3551277bcae1ced965b1c53c96 /nixos/doc/manual/release-notes/rl-2211.section.md | |
| parent | 81df6d7ff3995280326321cde38d5ca622ed1092 (diff) | |
haskellPackages.callHackage: updating all-cabal-hashes do not invalidate callHackage
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.
Diffstat (limited to 'nixos/doc/manual/release-notes/rl-2211.section.md')
| -rw-r--r-- | nixos/doc/manual/release-notes/rl-2211.section.md | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/nixos/doc/manual/release-notes/rl-2211.section.md b/nixos/doc/manual/release-notes/rl-2211.section.md index 72d16c4771a3b..071351939f659 100644 --- a/nixos/doc/manual/release-notes/rl-2211.section.md +++ b/nixos/doc/manual/release-notes/rl-2211.section.md @@ -529,4 +529,8 @@ Available as [services.patroni](options.html#opt-services.patroni.enable). - The option `services.picom.experimentalBackends` was removed since it is now the default and the option will cause `picom` to quit instead. +- `haskellPackage.callHackage` is not always invalidated if `all-cabal-hashes` changes, leading to less rebuilds of haskell dependencies. + +- `haskellPackages.callHackage` and `haskellPackages.callCabal2nix` (and related functions) no longer keep a reference to the `cabal2nix` call used to generate them. As a result, they will be garbage collected more often. + <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. --> |