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