nixpkgs/pkgs/build-support/fetchdocker/default.nix
2019-08-26 21:40:19 +00:00

62 lines
1.7 KiB
Nix

{ stdenv, lib, coreutils, bash, gnutar, writeText }:
let
stripScheme =
builtins.replaceStrings [ "https://" "http://" ] [ "" "" ];
stripNixStore =
s: lib.removePrefix "/nix/store/" s;
in
{ name
, registry ? "https://registry-1.docker.io/v2/"
, repository ? "library"
, imageName
, tag
, imageLayers
, imageConfig
, image ? "${stripScheme registry}/${repository}/${imageName}:${tag}"
}:
# Make sure there are *no* slashes in the repository or container
# names since we use these to make the output derivation name for the
# nix-store path.
assert null == lib.findFirst (c: "/"==c) null (lib.stringToCharacters repository);
assert null == lib.findFirst (c: "/"==c) null (lib.stringToCharacters imageName);
let
# Abuse paths to collapse possible double slashes
repoTag0 = builtins.toString (/. + "/${stripScheme registry}/${repository}/${imageName}");
repoTag1 = lib.removePrefix "/" repoTag0;
layers = builtins.map stripNixStore imageLayers;
manifest =
writeText "manifest.json" (builtins.toJSON [
{ Config = stripNixStore imageConfig;
Layers = layers;
RepoTags = [ "${repoTag1}:${tag}" ];
}]);
repositories =
writeText "repositories" (builtins.toJSON {
${repoTag1} = {
${tag} = lib.last layers;
};
});
imageFileStorePaths =
writeText "imageFileStorePaths.txt"
(lib.concatStringsSep "\n" ((lib.unique imageLayers) ++ [imageConfig]));
in
stdenv.mkDerivation {
builder = ./fetchdocker-builder.sh;
buildInputs = [ coreutils ];
preferLocalBuild = true;
inherit name imageName repository tag;
inherit bash gnutar manifest repositories;
inherit imageFileStorePaths;
passthru = {
inherit image;
};
}