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build.image: Add nix store db, maxLayers = 100

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This commit is contained in:
Robert Hensing 2019-03-11 14:40:23 +01:00
parent c6374e0931
commit 4ce69bbfba
1 changed files with 31 additions and 7 deletions
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38
src/nix/modules/service/image.nix
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@ -2,6 +2,36 @@
let
inherit (lib) types mkOption;
inherit (types) attrsOf listOf nullOr package str unspecified bool;
# TODO: dummy-config is a useless layer. Nix 2.3 will let us inspect
# the string context instead, so we can avoid this.
contentsList = config.image.contents ++ [
(pkgs.writeText "dummy-config.json" (builtins.toJSON config.image.rawConfig))
];
builtImage = pkgs.dockerTools.buildLayeredImage {
inherit (config.image)
name
contents
;
config = config.image.rawConfig;
maxLayers = 100;
# TODO: allow use of image's Nix package instead
# TODO: option to disable db generation
extraCommands = ''
echo "Generating the nix database..."
echo "Warning: only the database of the deepest Nix layer is loaded."
echo " If you want to use nix commands in the container, it would"
echo " be better to only have one layer that contains a nix store."
export NIX_REMOTE=local?root=$PWD
${pkgs.nix}/bin/nix-store --load-db < ${pkgs.closureInfo {rootPaths = contentsList;}}/registration
mkdir -p nix/var/nix/gcroots/docker/
for i in ${lib.concatStringsSep " " contentsList}; do
ln -s $i nix/var/nix/gcroots/docker/$(basename $i)
done;
'';
};
in
{
options = {
@ -72,13 +102,7 @@ in
};
};
config = {
build.image = pkgs.dockerTools.buildLayeredImage {
inherit (config.image)
name
contents
;
config = config.image.rawConfig;
};
build.image = builtImage;
build.imageName = config.build.image.imageName;
build.imageTag =
if config.build.image.imageTag != ""