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Add the overlay to the release.nix with extend instruction (#123)

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This change enables the integration of grpc-haskell within
foreign package set by exporting its overlay.
This commit is contained in:
Tristan de Cacqueray 2021-04-26 17:24:33 +00:00 committed by GitHub
parent 1bdc3662db
commit 0d1f54b6b8
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1 changed files with 18 additions and 2 deletions
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20
release.nix
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@ -52,10 +52,25 @@
# Note that `cabal2nix` also takes an optional `--revision` flag if you want to # Note that `cabal2nix` also takes an optional `--revision` flag if you want to
# pick a revision other than the latest to depend on. # pick a revision other than the latest to depend on.
# #
# Finally, if you want to test a local source checkout of a dependency, then # If you want to test a local source checkout of a dependency, then run:
# run:
# #
# $ cabal2nix path/to/dependency/repo > nix/${package-name}.nix # $ cabal2nix path/to/dependency/repo > nix/${package-name}.nix
#
# Finally, if you want to add grpc-haskell to your own package set, you can
# setup the overlay with:
#
# grpc-nixpkgs = import path/to/gRPC-haskell/nixpkgs.nix;
# grpc-overlay = (import path/to/gRPC-haskell/release.nix).overlay;
# # optionally use the same nixpkgs source
# pkgs = grpc-nixpkgs { overlays = [ grpc-overlay ]; };
#
# ... and use the extend function to setup haskell package override:
#
# # see https://github.com/NixOS/nixpkgs/issues/25887
# haskellPackages = pkgs.haskellPackages.extend (self: super: {
# your-package = self.callCabal2nix "your-package" ./. { };
# };);
let let
nixpkgs = import ./nixpkgs.nix; nixpkgs = import ./nixpkgs.nix;
@ -227,5 +242,6 @@ in
grpc = pkgs.grpc; grpc = pkgs.grpc;
overlay = overlay;
inherit (pkgs) test-grpc-haskell; inherit (pkgs) test-grpc-haskell;
} }