366 lines
13 KiB
Nix
366 lines
13 KiB
Nix
lib:
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{
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# git tag
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k3sVersion,
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# commit hash
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k3sCommit,
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k3sRepoSha256 ? lib.fakeHash,
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k3sVendorHash ? lib.fakeHash,
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# taken from ./scripts/version.sh VERSION_ROOT https://github.com/k3s-io/k3s/blob/v1.23.3%2Bk3s1/scripts/version.sh#L47
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k3sRootVersion,
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k3sRootSha256 ? lib.fakeHash,
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# Based on the traefik charts here: https://github.com/k3s-io/k3s/blob/d71ab6317e22dd34673faa307a412a37a16767f6/scripts/download#L29-L32
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# see also https://github.com/k3s-io/k3s/blob/d71ab6317e22dd34673faa307a412a37a16767f6/manifests/traefik.yaml#L8
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chartVersions,
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# taken from ./scripts/version.sh VERSION_CNIPLUGINS https://github.com/k3s-io/k3s/blob/v1.23.3%2Bk3s1/scripts/version.sh#L45
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k3sCNIVersion,
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k3sCNISha256 ? lib.fakeHash,
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# taken from ./scripts/version.sh VERSION_CONTAINERD
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containerdVersion,
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containerdSha256 ? lib.fakeHash,
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# run `grep github.com/kubernetes-sigs/cri-tools go.mod | head -n1 | awk '{print $4}'` in the k3s repo at the tag
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criCtlVersion,
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updateScript ? null,
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}:
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# builder.nix contains a "builder" expression that, given k3s version and hash
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# variables, creates a package for that version.
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# Due to variance in k3s's build process, this builder only works for k3s 1.26+
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# currently.
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# It is likely we will have to split out additional builders for additional
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# versions in the future, or customize this one further.
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{ lib
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, fetchpatch
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, makeWrapper
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, socat
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, iptables
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, iproute2
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, ipset
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, bridge-utils
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, btrfs-progs
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, conntrack-tools
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, buildGoModule
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, runc
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, rsync
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, kmod
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, libseccomp
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, pkg-config
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, ethtool
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, util-linux
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, fetchFromGitHub
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, fetchurl
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, fetchzip
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, fetchgit
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, zstd
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, yq-go
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, sqlite
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, nixosTests
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, pkgsBuildBuild
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}:
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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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baseMeta = with lib; {
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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 = with maintainers; [ euank mic92 superherointj yajo ];
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platforms = platforms.linux;
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# resolves collisions with other installations of kubectl, crictl, ctr
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# prefer non-k3s versions
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priority = 5;
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};
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# https://github.com/k3s-io/k3s/blob/5fb370e53e0014dc96183b8ecb2c25a61e891e76/scripts/build#L19-L40
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versionldflags = [
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"-X github.com/rancher/k3s/pkg/version.Version=v${k3sVersion}"
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"-X github.com/rancher/k3s/pkg/version.GitCommit=${lib.substring 0 8 k3sCommit}"
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"-X k8s.io/client-go/pkg/version.gitVersion=v${k3sVersion}"
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"-X k8s.io/client-go/pkg/version.gitCommit=${k3sCommit}"
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"-X k8s.io/client-go/pkg/version.gitTreeState=clean"
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"-X k8s.io/client-go/pkg/version.buildDate=1970-01-01T01:01:01Z"
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"-X k8s.io/component-base/version.gitVersion=v${k3sVersion}"
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"-X k8s.io/component-base/version.gitCommit=${k3sCommit}"
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"-X k8s.io/component-base/version.gitTreeState=clean"
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"-X k8s.io/component-base/version.buildDate=1970-01-01T01:01:01Z"
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"-X github.com/kubernetes-sigs/cri-tools/pkg/version.Version=v${criCtlVersion}"
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"-X github.com/containerd/containerd/version.Version=v${containerdVersion}"
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"-X github.com/containerd/containerd/version.Package=github.com/k3s-io/containerd"
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];
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# bundled into the k3s binary
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traefikChart = fetchurl chartVersions.traefik;
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traefik-crdChart = fetchurl chartVersions.traefik-crd;
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# so, k3s is a complicated thing to package
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# This derivation attempts to avoid including any random binaries from the
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# internet. k3s-root is _mostly_ binaries built to be bundled in k3s (which
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# we don't care about doing, we can add those as build or runtime
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# dependencies using a real package manager).
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# In addition to those binaries, it's also configuration though (right now
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# mostly strongswan configuration), and k3s does use those files.
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# As such, we download it in order to grab 'etc' and bundle it into the final
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# k3s binary.
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k3sRoot = fetchzip {
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# Note: marked as apache 2.0 license
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url = "https://github.com/k3s-io/k3s-root/releases/download/v${k3sRootVersion}/k3s-root-amd64.tar";
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sha256 = k3sRootSha256;
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stripRoot = false;
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};
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k3sCNIPlugins = buildGoModule rec {
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pname = "k3s-cni-plugins";
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version = k3sCNIVersion;
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vendorHash = null;
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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 = k3sCNISha256;
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};
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postInstall = ''
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mv $out/bin/plugins $out/bin/cni
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'';
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meta = baseMeta // {
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description = "CNI plugins, as patched by rancher for k3s";
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};
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};
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# Grab this separately from a build because it's used by both stages of the
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# k3s build.
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k3sRepo = fetchgit {
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url = "https://github.com/k3s-io/k3s";
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rev = "v${k3sVersion}";
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sha256 = k3sRepoSha256;
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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 buildGoModule
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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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k3sServer = buildGoModule {
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pname = "k3s-server";
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version = k3sVersion;
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src = k3sRepo;
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vendorHash = k3sVendorHash;
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patches =
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# Disable: Add runtime checking of golang version
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(fetchpatch {
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# https://github.com/k3s-io/k3s/pull/9054
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url = "https://github.com/k3s-io/k3s/commit/b297996b9252b02e56e9425f55f6becbf6bb7832.patch";
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hash = "sha256-xBOY2jnLhT9dtVKtq26V9QUnuX1q6E/9UcO9IaU719U=";
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revert = true;
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});
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nativeBuildInputs = [ pkg-config ];
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buildInputs = [ libseccomp sqlite.dev ];
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subPackages = [ "cmd/server" ];
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ldflags = versionldflags;
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tags = [ "ctrd" "libsqlite3" "linux" ];
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# create the multicall symlinks for k3s
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postInstall = ''
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mv $out/bin/server $out/bin/k3s
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pushd $out
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# taken verbatim from https://github.com/k3s-io/k3s/blob/v1.23.3%2Bk3s1/scripts/build#L105-L113
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ln -s k3s ./bin/containerd
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ln -s k3s ./bin/crictl
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ln -s k3s ./bin/ctr
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ln -s k3s ./bin/k3s-agent
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ln -s k3s ./bin/k3s-certificate
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ln -s k3s ./bin/k3s-completion
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ln -s k3s ./bin/k3s-etcd-snapshot
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ln -s k3s ./bin/k3s-secrets-encrypt
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ln -s k3s ./bin/k3s-server
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ln -s k3s ./bin/k3s-token
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ln -s k3s ./bin/kubectl
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popd
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'';
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meta = baseMeta // {
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description = "The various binaries that get packaged into the final k3s binary";
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};
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};
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# Only used for the shim since
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# https://github.com/k3s-io/k3s/blob/v1.27.2%2Bk3s1/scripts/build#L153
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k3sContainerd = buildGoModule {
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pname = "k3s-containerd";
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version = containerdVersion;
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src = fetchFromGitHub {
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owner = "k3s-io";
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repo = "containerd";
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rev = "v${containerdVersion}";
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sha256 = containerdSha256;
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};
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vendorHash = null;
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buildInputs = [ btrfs-progs ];
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subPackages = [ "cmd/containerd-shim-runc-v2" ];
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ldflags = versionldflags;
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};
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in
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buildGoModule rec {
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pname = "k3s";
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version = k3sVersion;
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tags = [ "libsqlite3" "linux" "ctrd" ];
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src = k3sRepo;
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vendorHash = k3sVendorHash;
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postPatch = ''
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# Nix prefers dynamically linked binaries over static binary.
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substituteInPlace scripts/package-cli \
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--replace '"$LDFLAGS $STATIC" -o' \
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'"$LDFLAGS" -o' \
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--replace "STATIC=\"-extldflags \'-static\'\"" \
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""
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# Upstream codegen fails with trimpath set. Removes "trimpath" for 'go generate':
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substituteInPlace scripts/package-cli \
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--replace '"''${GO}" generate' \
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'GOFLAGS="" \
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GOOS="${pkgsBuildBuild.go.GOOS}" \
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GOARCH="${pkgsBuildBuild.go.GOARCH}" \
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CC="${pkgsBuildBuild.stdenv.cc}/bin/cc" \
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"''${GO}" generate'
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'';
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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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iproute2
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ipset
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bridge-utils
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ethtool
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util-linux # kubelet wants 'nsenter' from util-linux: https://github.com/kubernetes/kubernetes/issues/26093#issuecomment-705994388
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conntrack-tools
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runc
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];
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buildInputs = k3sRuntimeDeps;
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nativeBuildInputs = [
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makeWrapper
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rsync
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yq-go
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zstd
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];
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# embedded in the final k3s cli
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propagatedBuildInputs = [
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k3sCNIPlugins
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k3sContainerd
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k3sServer
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];
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# We override most of buildPhase due to peculiarities in k3s's build.
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# Specifically, it has a 'go generate' which runs part of the package. See
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# this comment:
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# https://github.com/NixOS/nixpkgs/pull/158089#discussion_r799965694
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# So, why do we use buildGoModule at all? For the `vendorHash` / `go mod download` stuff primarily.
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buildPhase = ''
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patchShebangs ./scripts/package-cli ./scripts/download ./scripts/build-upload
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# copy needed 'go generate' inputs into place
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mkdir -p ./bin/aux
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rsync -a --no-perms ${k3sServer}/bin/ ./bin/
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ln -vsf ${k3sCNIPlugins}/bin/cni ./bin/cni
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ln -vsf ${k3sContainerd}/bin/containerd-shim-runc-v2 ./bin
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rsync -a --no-perms --chmod u=rwX ${k3sRoot}/etc/ ./etc/
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mkdir -p ./build/static/charts
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cp ${traefikChart} ./build/static/charts
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cp ${traefik-crdChart} ./build/static/charts
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export ARCH=$GOARCH
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export DRONE_TAG="v${k3sVersion}"
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export DRONE_COMMIT="${k3sCommit}"
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# use ./scripts/package-cli to run 'go generate' + 'go build'
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./scripts/package-cli
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mkdir -p $out/bin
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'';
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# Otherwise it depends on 'getGoDirs', which is normally set in buildPhase
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doCheck = false;
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installPhase = ''
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# wildcard to match the arm64 build too
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install -m 0755 dist/artifacts/k3s* -D $out/bin/k3s
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wrapProgram $out/bin/k3s \
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--prefix PATH : ${lib.makeBinPath k3sRuntimeDeps} \
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--prefix PATH : "$out/bin"
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ln -s $out/bin/k3s $out/bin/kubectl
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ln -s $out/bin/k3s $out/bin/crictl
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ln -s $out/bin/k3s $out/bin/ctr
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'';
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doInstallCheck = true;
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installCheckPhase = ''
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$out/bin/k3s --version | grep -F "v${k3sVersion}" >/dev/null
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'';
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passthru.updateScript = updateScript;
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passthru.mkTests = version:
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let k3s_version = "k3s_" + lib.replaceStrings ["."] ["_"] (lib.versions.majorMinor version);
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in {
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etcd = nixosTests.k3s.etcd.${k3s_version};
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single-node = nixosTests.k3s.single-node.${k3s_version};
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multi-node = nixosTests.k3s.multi-node.${k3s_version};
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};
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passthru.tests = passthru.mkTests k3sVersion;
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meta = baseMeta;
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}
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