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author | Guillaume Bouchard <guillaum.bouchard@gmail.com> | 2022-10-06 15:38:12 +0200 |
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committer | sternenseemann <sternenseemann@systemli.org> | 2022-11-26 19:00:56 +0100 |
commit | d1b6d2d0ab89b4a5e58d0020500445b0c9c73a4e (patch) | |
tree | d9f19a84e9440c3551277bcae1ced965b1c53c96 /pkgs/development/haskell-modules/make-package-set.nix | |
parent | 81df6d7ff3995280326321cde38d5ca622ed1092 (diff) | |
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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 'pkgs/development/haskell-modules/make-package-set.nix')
-rw-r--r-- | pkgs/development/haskell-modules/make-package-set.nix | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/pkgs/development/haskell-modules/make-package-set.nix b/pkgs/development/haskell-modules/make-package-set.nix index 843d1a9694c3..3dd019486227 100644 --- a/pkgs/development/haskell-modules/make-package-set.nix +++ b/pkgs/development/haskell-modules/make-package-set.nix @@ -161,17 +161,13 @@ let src = "${component}/${name}.cabal"; }; - # Adds a nix file as an input to the haskell derivation it - # produces. This is useful for callHackage / callCabal2nix to - # prevent the generated default.nix from being garbage collected - # (requiring it to be frequently rebuilt), which can be an - # annoyance. + # Adds a nix file derived from cabal2nix in the passthru of the derivation it + # produces. This is useful to debug callHackage / callCabal2nix by looking at + # the content of the nix file pointed by `cabal2nixDeriver`. + # However, it does not keep a reference to that file, which may be garbage + # collected, which may be an annoyance. callPackageKeepDeriver = src: args: overrideCabal (orig: { - preConfigure = '' - # Generated from ${src} - ${orig.preConfigure or ""} - ''; passthru = orig.passthru or {} // { # When using callCabal2nix or callHackage, it is often useful # to debug a failure by inspecting the Nix expression |