269 lines
9.2 KiB
Nix
269 lines
9.2 KiB
Nix
{ stdenv
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, lib
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, makeWrapper
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, socat
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, iptables
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, iproute
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, bridge-utils
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, conntrack-tools
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, buildGoPackage
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, git
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, runc
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, kmod
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, libseccomp
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, pkgconfig
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, ethtool
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, util-linux
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, ipset
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, fetchFromGitHub
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, fetchurl
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, fetchzip
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, fetchgit
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}:
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with lib;
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# k3s is a kinda weird derivation. One of the main points of k3s is the
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# simplicity of it being one binary that can perform several tasks.
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# However, when you have a good package manager (like nix), that doesn't
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# actually make much of a difference; you don't really care if it's one binary
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# or 10 since with a good package manager, installing and running it is
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# identical.
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# Since upstream k3s packages itself as one large binary with several
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# "personalities" (in the form of subcommands like 'k3s agent' and 'k3s
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# kubectl'), it ends up being easiest to mostly mimic upstream packaging, with
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# some exceptions.
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# K3s also carries patches to some packages (such as containerd and cni
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# plugins), so we intentionally use the k3s versions of those binaries for k3s,
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# even if the upstream version of those binaries exist in nixpkgs already. In
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# the end, that means we have a thick k3s binary that behaves like the upstream
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# one for the most part.
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# However, k3s also bundles several pieces of unpatched software, from the
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# strongswan vpn software, to iptables, to socat, conntrack, busybox, etc.
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# Those pieces of software we entirely ignore upstream's handling of, and just
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# make sure they're in the path if desired.
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let
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k3sVersion = "1.19.2+k3s1"; # k3s git tag
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traefikChartVersion = "1.81.0"; # taken from ./scripts/download at the above k3s tag
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k3sRootVersion = "0.6.0-rc3"; # taken from ./scripts/download at the above k3s tag
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k3sCNIVersion = "0.8.6-k3s1"; # taken from ./scripts/version.sh at the above k3s tag
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# bundled into the k3s binary
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traefikChart = fetchurl {
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url = "https://kubernetes-charts.storage.googleapis.com/traefik-${traefikChartVersion}.tgz";
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sha256 = "1aqpzgjlvqhil0g3angz94zd4xbl4iq0qmpjcy5aq1xv9qciwdi9";
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};
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# so, k3s is a complicated thing to package
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# This derivation attempts to avoid including any random binaries from the
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# internet. k3s-root is _mostly_ binaries built to be bundled in k3s (which
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# we don't care about doing, we can add those as build or runtime
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# dependencies using a real package manager).
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# In addition to those binaries, it's also configuration though (right now
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# mostly strongswan configuration), and k3s does use those files.
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# As such, we download it in order to grab 'etc' and bundle it into the final
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# k3s binary.
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k3sRoot = fetchzip {
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# Note: marked as apache 2.0 license
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url = "https://github.com/rancher/k3s-root/releases/download/v${k3sRootVersion}/k3s-root-amd64.tar";
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sha256 = "0xj3dcqawpzyzmz545iwh151krzbs9csnzg3zfl74lkv2kxgidk6";
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stripRoot = false;
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};
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k3sPlugins = buildGoPackage rec {
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name = "k3s-cni-plugins";
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version = k3sCNIVersion;
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goPackagePath = "github.com/containernetworking/plugins";
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subPackages = [ "." ];
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src = fetchFromGitHub {
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owner = "rancher";
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repo = "plugins";
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rev = "v${version}";
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sha256 = "13kx9msn5y9rw8v1p717wx0wbjqln59g6y3qfb1760aiwknva35q";
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};
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meta = {
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description = "CNI plugins, as patched by rancher for k3s";
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license = licenses.asl20;
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homepage = "https://k3s.io";
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maintainers = [ maintainers.euank ];
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platforms = platforms.linux;
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};
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};
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# Grab this separately from a build because it's used by both stages of the
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# k3s build.
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k3sRepo = fetchgit {
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url = "https://github.com/rancher/k3s";
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rev = "v${k3sVersion}";
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leaveDotGit = true; # ./scripts/version.sh depends on git
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sha256 = "1hbnarchs9w52w061bvfjvssdh7ycnxa04camjwkcx8vr0k804h4";
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};
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# Stage 1 of the k3s build:
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# Let's talk about how k3s is structured.
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# One of the ideas of k3s is that there's the single "k3s" binary which can
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# do everything you need, from running a k3s server, to being a worker node,
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# to running kubectl.
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# The way that actually works is that k3s is a single go binary that contains
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# a bunch of bindata that it unpacks at runtime into directories (either the
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# user's home directory or /var/lib/rancher if run as root).
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# This bindata includes both binaries and configuration.
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# In order to let nixpkgs do all its autostripping/patching/etc, we split this into two derivations.
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# First, we build all the binaries that get packed into the thick k3s binary
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# (and output them from one derivation so they'll all be suitably patched up).
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# Then, we bundle those binaries into our thick k3s binary and use that as
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# the final single output.
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# This approach was chosen because it ensures the bundled binaries all are
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# correctly built to run with nix (we can lean on the existing buildGoPackage
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# stuff), and we can again lean on that tooling for the final k3s binary too.
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# Other alternatives would be to manually run the
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# strip/patchelf/remove-references step ourselves in the installPhase of the
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# derivation when we've built all the binaries, but haven't bundled them in
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# with generated bindata yet.
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k3sBuildStage1 = buildGoPackage rec {
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name = "k3s-build-1";
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version = "${k3sVersion}";
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goPackagePath = "github.com/rancher/k3s";
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src = k3sRepo;
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patches = [ ./patches/0001-Use-rm-from-path-in-go-generate.patch ./patches/0002-Add-nixpkgs-patches.patch ];
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nativeBuildInputs = [ git pkgconfig ];
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buildInputs = [ libseccomp ];
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buildPhase = ''
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pushd go/src/${goPackagePath}
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patchShebangs ./scripts/build ./scripts/version.sh
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mkdir -p bin
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./scripts/build
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popd
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'';
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installPhase = ''
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pushd go/src/${goPackagePath}
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mkdir -p "$out/bin"
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install -m 0755 -t "$out/bin" ./bin/*
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popd
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'';
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meta = {
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description = "The various binaries that get packaged into the final k3s binary";
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license = licenses.asl20;
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homepage = "https://k3s.io";
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maintainers = [ maintainers.euank ];
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platforms = platforms.linux;
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};
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};
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k3sBuild = buildGoPackage rec {
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name = "k3s-build";
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version = "${k3sVersion}";
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goPackagePath = "github.com/rancher/k3s";
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src = k3sRepo;
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patches = [ ./patches/0001-Use-rm-from-path-in-go-generate.patch ./patches/0002-Add-nixpkgs-patches.patch ];
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nativeBuildInputs = [ git pkgconfig ];
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buildInputs = [ k3sBuildStage1 k3sPlugins runc ];
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# k3s appends a suffix to the final distribution binary for some arches
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archSuffix =
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if stdenv.hostPlatform.system == "x86_64-linux" then ""
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else if stdenv.hostPlatform.system == "aarch64-linux" then "-arm64"
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else throw "k3s isn't being built for ${stdenv.hostPlatform.system} yet.";
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# In order to build the thick k3s binary (which is what
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# ./scripts/package-cli does), we need to get all the binaries that script
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# expects in place.
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buildPhase = ''
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pushd go/src/${goPackagePath}
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patchShebangs ./scripts/build ./scripts/version.sh ./scripts/package-cli
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mkdir -p bin
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install -m 0755 -t ./bin ${k3sBuildStage1}/bin/*
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install -m 0755 -T "${k3sPlugins}/bin/plugins" ./bin/cni
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# Note: use the already-nixpkgs-bundled k3s rather than the one bundled
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# in k3s because the k3s one is completely unmodified from upstream
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# (unlike containerd, cni, etc)
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install -m 0755 -T "${runc}/bin/runc" ./bin/runc
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cp -R "${k3sRoot}/etc" ./etc
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mkdir -p "build/static/charts"
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cp "${traefikChart}" "build/static/charts/traefik-${traefikChartVersion}.tgz"
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./scripts/package-cli
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popd
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'';
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installPhase = ''
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pushd go/src/${goPackagePath}
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mkdir -p "$out/bin"
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install -m 0755 -T ./dist/artifacts/k3s${archSuffix} "$out/bin/k3s"
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popd
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'';
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meta = {
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description = "The k3s go binary which is used by the final wrapped output below";
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license = licenses.asl20;
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homepage = "https://k3s.io";
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maintainers = [ maintainers.euank ];
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platforms = platforms.linux;
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};
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};
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in
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stdenv.mkDerivation rec {
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name = "k3s";
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version = k3sVersion;
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# Important utilities used by the kubelet, see
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# https://github.com/kubernetes/kubernetes/issues/26093#issuecomment-237202494
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# Note the list in that issue is stale and some aren't relevant for k3s.
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k3sRuntimeDeps = [
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kmod
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socat
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iptables
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iproute
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bridge-utils
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ethtool
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util-linux
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ipset
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conntrack-tools
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];
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buildInputs = [
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k3sBuild
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makeWrapper
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] ++ k3sRuntimeDeps;
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unpackPhase = "true";
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# And, one final derivation (you thought the last one was it, right?)
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# We got the binary we wanted above, but it doesn't have all the runtime
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# dependencies k8s wants, including mount utilities for kubelet, networking
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# tools for cni/kubelet stuff, etc
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# Use a wrapper script to reference all the binaries that k3s tries to
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# execute, but that we didn't bundle with it.
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installPhase = ''
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mkdir -p "$out/bin"
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makeWrapper ${k3sBuild}/bin/k3s "$out/bin/k3s" \
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--prefix PATH : ${lib.makeBinPath k3sRuntimeDeps} \
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--prefix PATH : "$out/bin"
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'';
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meta = {
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description = "A lightweight Kubernetes distribution";
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license = licenses.asl20;
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homepage = "https://k3s.io";
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maintainers = [ maintainers.euank ];
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platforms = platforms.linux;
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};
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}
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