forked from lix-project/lix
Rewrite docker to be sensible and smaller
I have checked the image can build things and inspected `diff -ru`
compared to the old image. As far as I can tell it is more or less
the same besides the later git change.
Layers are now 65MB or less, and we aren't against the maxLayers limit
for the broken automatic layering to do anything but shove one store
path in a layer (which is good behaviour, actually).
This uses nix2container which streams images, so the build time is much
shorter.
I have also taken the opportunity to, in addition to fixing the 400MB
single layer (terrible, and what motivated this in the first place),
delete about 200MB of closure size inflicted by git vs gitMinimal
causing both perl and python to get into closure.
People mostly use this thing for CI, so I don't really think you need
advanced git operations, and large git can be added at the user side if
really motivated.
With love for whichever container developer somewhat ironically assumed
that one would not run skopeo in a minimal container that doesn't have a
/var/tmp.
Fixes: lix-project/lix#378
Change-Id: Icc3aa20e64446276716fbbb87535fd5b50628010
This commit is contained in:
parent
ff95b980d4
commit
9bb7fb8f69
4 changed files with 168 additions and 77 deletions
131
docker.nix
131
docker.nix
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@ -1,5 +1,6 @@
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{
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pkgs ? import <nixpkgs> { },
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nix2container,
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lib ? pkgs.lib,
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name ? "lix",
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tag ? "latest",
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@ -12,26 +13,51 @@
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flake-registry ? null,
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}:
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let
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defaultPkgs =
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with pkgs;
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[
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nix
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layerContents = with pkgs; [
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# pulls in glibc and openssl, about 60MB
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{ contents = [ coreutils-full ]; }
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# some stuff that is low in the closure graph and small ish, mostly to make
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# incremental lix updates cheaper
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{
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contents = [
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curl
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libxml2
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sqlite
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];
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}
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# 50MB of git
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{ contents = [ gitMinimal ]; }
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# 144MB of nixpkgs
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{
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contents = [ channel ];
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inProfile = false;
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}
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];
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# These packages are left to be auto layered by nix2container, since it is
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# less critical that they get layered sensibly and they tend to not be deps
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# of anything in particular
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autoLayered = with pkgs; [
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bashInteractive
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coreutils-full
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gnutar
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gzip
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gnugrep
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which
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curl
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less
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wget
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man
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cacert.out
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findutils
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iana-etc
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git
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openssh
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]
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nix
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];
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defaultPkgs =
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lib.lists.flatten (
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map (x: if !(x ? inProfile) || x.inProfile then x.contents else [ ]) layerContents
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)
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++ autoLayered
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++ extraPkgs;
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users =
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@ -139,16 +165,17 @@ let
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))
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+ "\n";
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baseSystem =
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let
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nixpkgs = pkgs.path;
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channel = pkgs.runCommand "channel-nixos" { inherit bundleNixpkgs; } ''
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channel = pkgs.runCommand "channel-nixpkgs" { } ''
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mkdir $out
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if [ "$bundleNixpkgs" ]; then
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${lib.optionalString bundleNixpkgs ''
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ln -s ${nixpkgs} $out/nixpkgs
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echo "[]" > $out/manifest.nix
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fi
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''}
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'';
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baseSystem =
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let
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rootEnv = pkgs.buildPackages.buildEnv {
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name = "root-profile-env";
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paths = defaultPkgs;
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@ -187,7 +214,7 @@ let
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profile = pkgs.buildPackages.runCommand "user-environment" { } ''
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mkdir $out
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cp -a ${rootEnv}/* $out/
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ln -s ${manifest} $out/manifest.nix
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ln -sf ${manifest} $out/manifest.nix
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'';
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flake-registry-path =
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if (flake-registry == null) then
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@ -236,6 +263,7 @@ let
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ln -s /nix/var/nix/profiles/share $out/usr/
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mkdir -p $out/nix/var/nix/gcroots
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ln -s /nix/var/nix/profiles $out/nix/var/nix/gcroots/profiles
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mkdir $out/tmp
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@ -248,14 +276,14 @@ let
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mkdir -p $out/nix/var/nix/profiles/per-user/root
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ln -s ${profile} $out/nix/var/nix/profiles/default-1-link
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ln -s $out/nix/var/nix/profiles/default-1-link $out/nix/var/nix/profiles/default
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ln -s /nix/var/nix/profiles/default-1-link $out/nix/var/nix/profiles/default
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ln -s /nix/var/nix/profiles/default $out/root/.nix-profile
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ln -s ${channel} $out/nix/var/nix/profiles/per-user/root/channels-1-link
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ln -s $out/nix/var/nix/profiles/per-user/root/channels-1-link $out/nix/var/nix/profiles/per-user/root/channels
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ln -s /nix/var/nix/profiles/per-user/root/channels-1-link $out/nix/var/nix/profiles/per-user/root/channels
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mkdir -p $out/root/.nix-defexpr
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ln -s $out/nix/var/nix/profiles/per-user/root/channels $out/root/.nix-defexpr/channels
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ln -s /nix/var/nix/profiles/per-user/root/channels $out/root/.nix-defexpr/channels
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echo "${channelURL} ${channelName}" > $out/root/.nix-channels
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mkdir -p $out/bin $out/usr/bin
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@ -273,21 +301,35 @@ let
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ln -s $globalFlakeRegistryPath $out/nix/var/nix/gcroots/auto/$rootName
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'')
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);
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in
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pkgs.dockerTools.buildLayeredImageWithNixDb {
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layers = builtins.foldl' (
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layersList: el:
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let
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layer = nix2container.buildLayer {
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deps = el.contents;
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layers = layersList;
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};
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in
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layersList ++ [ layer ]
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) [ ] layerContents;
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image = nix2container.buildImage {
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inherit name tag maxLayers;
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contents = [ baseSystem ];
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inherit layers;
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extraCommands = ''
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rm -rf nix-support
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ln -s /nix/var/nix/profiles nix/var/nix/gcroots/profiles
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'';
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fakeRootCommands = ''
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chmod 1777 tmp
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chmod 1777 var/tmp
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'';
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copyToRoot = [ baseSystem ];
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initializeNixDatabase = true;
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perms = [
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{
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path = baseSystem;
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regex = "(/var)?/tmp";
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mode = "1777";
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}
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];
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config = {
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Cmd = [ "/root/.nix-profile/bin/bash" ];
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@ -312,4 +354,37 @@ pkgs.dockerTools.buildLayeredImageWithNixDb {
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"NIX_PATH=/nix/var/nix/profiles/per-user/root/channels:/root/.nix-defexpr/channels"
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];
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};
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};
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in
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image
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// {
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# We don't ship the tarball as the default output because it is a strange thing to want imo
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tarball =
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pkgs.buildPackages.runCommand "docker-image-tarball-${pkgs.nix.version}"
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{
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nativeBuildInputs = [ pkgs.buildPackages.bubblewrap ];
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meta.description = "Docker image tarball with Lix for ${pkgs.system}";
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}
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''
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mkdir -p $out/nix-support
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image=$out/image.tar
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# bwrap for foolish temp dir selection code that forces /var/tmp:
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# https://github.com/containers/skopeo.git/blob/60ee543f7f7c242f46cc3a7541d9ac8ab1c89168/vendor/github.com/containers/image/v5/internal/tmpdir/tmpdir.go#L15-L18
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mkdir -p $TMPDIR/fake-var/tmp
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args=(--unshare-user --bind "$TMPDIR/fake-var" /var)
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for dir in /*; do
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args+=(--dev-bind "/$dir" "/$dir")
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done
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bwrap ''${args[@]} -- ${lib.getExe image.copyTo} docker-archive:$image
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gzip $image
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echo "file binary-dist $image" >> $out/nix-support/hydra-build-products
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'';
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meta = image.meta // {
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description = "Docker image for Lix. This is built with nix2container; see that project's README for details";
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longDescription = ''
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Docker image for Lix, built with nix2container.
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To copy it to your docker daemon, nix run .#dockerImage.copyToDockerDaemon
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To copy it to podman, nix run .#dockerImage.copyTo containers-storage:lix
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'';
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};
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}
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17
flake.lock
17
flake.lock
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@ -16,6 +16,22 @@
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"type": "github"
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}
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},
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"nix2container": {
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"flake": false,
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"locked": {
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"lastModified": 1712990762,
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"narHash": "sha256-hO9W3w7NcnYeX8u8cleHiSpK2YJo7ecarFTUlbybl7k=",
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"owner": "nlewo",
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"repo": "nix2container",
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"rev": "20aad300c925639d5d6cbe30013c8357ce9f2a2e",
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"type": "github"
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},
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"original": {
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"owner": "nlewo",
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"repo": "nix2container",
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"type": "github"
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}
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},
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"nixpkgs": {
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"locked": {
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"lastModified": 1715123187,
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"root": {
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"inputs": {
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"flake-compat": "flake-compat",
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"nix2container": "nix2container",
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"nixpkgs": "nixpkgs",
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"nixpkgs-regression": "nixpkgs-regression",
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"pre-commit-hooks": "pre-commit-hooks"
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19
flake.nix
19
flake.nix
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@ -8,6 +8,10 @@
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url = "github:cachix/git-hooks.nix";
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flake = false;
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};
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nix2container = {
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url = "github:nlewo/nix2container";
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flake = false;
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};
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flake-compat = {
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url = "github:edolstra/flake-compat";
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flake = false;
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@ -20,6 +24,7 @@
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nixpkgs,
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nixpkgs-regression,
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pre-commit-hooks,
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nix2container,
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flake-compat,
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}:
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@ -330,19 +335,13 @@
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dockerImage =
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let
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pkgs = nixpkgsFor.${system}.native;
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image = import ./docker.nix {
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nix2container' = import nix2container { inherit pkgs system; };
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in
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import ./docker.nix {
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inherit pkgs;
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nix2container = nix2container'.nix2container;
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tag = pkgs.nix.version;
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};
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in
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pkgs.runCommand "docker-image-tarball-${pkgs.nix.version}"
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{ meta.description = "Docker image with Lix for ${system}"; }
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''
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mkdir -p $out/nix-support
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image=$out/image.tar.gz
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ln -s ${image} $image
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echo "file binary-dist $image" >> $out/nix-support/hydra-build-products
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'';
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}
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// builtins.listToAttrs (
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map (crossSystem: {
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@ -33,7 +33,7 @@ let
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targetName = "*.tar.xz";
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}) systems
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++ builtins.map (system: {
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target = hydraJobs.dockerImage.${system};
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target = hydraJobs.dockerImage.${system}.tarball;
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targetName = "image.tar.gz";
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rename = "lix-${lix.version}-docker-image-${system}.tar.gz";
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}) dockerSystems;
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