90 lines
2.5 KiB
Nix
90 lines
2.5 KiB
Nix
{
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pkgs,
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lib,
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haskellPackages,
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haskell,
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runCommand,
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buildPackages,
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}:
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let
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/*
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This derivation builds the arion tool.
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It is based on the arion-compose Haskell package, but adapted and extended to
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- have the correct name
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- have a smaller closure size
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- have functions to use Arion from inside Nix: arion.eval and arion.build
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- make it self-contained by including docker-compose
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*/
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arion = (justStaticExecutables (overrideCabal cabalOverrides arion-compose)).overrideAttrs (o: {
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# Patch away the arion-compose name. Unlike the Haskell library, the program
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# is called arion (arion was already taken on hackage).
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pname = "arion";
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});
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inherit (haskell.lib.compose) justStaticExecutables overrideCabal;
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inherit (haskellPackages) arion-compose;
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cabalOverrides = o: {
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buildTools = (o.buildTools or [ ]) ++ [ buildPackages.makeWrapper ];
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passthru = (o.passthru or { }) // {
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inherit eval build;
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};
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src = arion-compose.src;
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# PYTHONPATH
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#
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# We close off the python module search path!
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#
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# Accepting directories from the environment into the search path
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# tends to break things. Docker Compose does not have a plugin
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# system as far as I can tell, so I don't expect this to break a
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# feature, but rather to make the program more robustly self-
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# contained.
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postInstall =
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o.postInstall or ""
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+ ''
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mkdir -p $out/libexec
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mv $out/bin/arion $out/libexec
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makeWrapper $out/libexec/arion $out/bin/arion \
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--unset PYTHONPATH \
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--prefix PATH : ${lib.makeBinPath [ pkgs.docker-compose ]} \
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;
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'';
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};
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# Unpacked sources for evaluation by `eval`
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srcUnpacked =
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runCommand "arion-src" { }
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"mkdir $out; tar -C $out --strip-components=1 -xf ${arion-compose.src}";
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/*
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Function for evaluating a composition
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Re-uses this Nixpkgs evaluation instead of `arion-pkgs.nix`.
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Returns the module system's `config` and `options` variables.
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*/
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eval =
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args@{ ... }: import (srcUnpacked + "/src/nix/eval-composition.nix") ({ inherit pkgs; } // args);
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/*
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Function to derivation of the docker compose yaml file
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NOTE: The output will change: https://github.com/hercules-ci/arion/issues/82
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This function is particularly useful on CI, although the references
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to image tarballs may not always be desirable.
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*/
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build =
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args@{ ... }:
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let
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composition = eval args;
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in
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composition.config.out.dockerComposeYaml;
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in
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arion
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