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# Test Nix's remote build feature.
{ config, lib, hostPkgs, ... }:
let
pkgs = config.nodes.client.nixpkgs.pkgs;
# The configuration of the remote builders.
builder =
{ config, pkgs, ... }:
{ services.openssh.enable = true;
virtualisation.writableStore = true;
nix.settings.sandbox = true;
# Regression test for use of PID namespaces when /proc has
# filesystems mounted on top of it
# (i.e. /proc/sys/fs/binfmt_misc).
boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
};
# Trivial Nix expression to build remotely.
expr = config: nr: pkgs.writeText "expr.nix"
''
let utils = builtins.storePath ${config.system.build.extraUtils}; in
derivation {
name = "hello-${toString nr}";
system = "i686-linux";
PATH = "''${utils}/bin";
builder = "''${utils}/bin/sh";
args = [ "-c" "if [ ${toString nr} = 5 ]; then echo FAIL; exit 1; fi; echo Hello; mkdir $out $foo; cat /proc/sys/kernel/hostname > $out/host; ln -s $out $foo/bar; sleep 10" ];
outputs = [ "out" "foo" ];
}
'';
in
{
name = "remote-builds";
nodes =
{ builder1 = builder;
builder2 = builder;
client =
{ config, lib, pkgs, ... }:
{ nix.settings.max-jobs = 0; # force remote building
nix.distributedBuilds = true;
nix.buildMachines =
[ { hostName = "builder1";
sshUser = "root";
sshKey = "/root/.ssh/id_ed25519";
system = "i686-linux";
maxJobs = 1;
}
{ hostName = "builder2";
sshUser = "root";
sshKey = "/root/.ssh/id_ed25519";
system = "i686-linux";
maxJobs = 1;
}
];
virtualisation.writableStore = true;
virtualisation.additionalPaths = [ config.system.build.extraUtils ];
nix.settings.substituters = lib.mkForce [ ];
programs.ssh.extraConfig = "ConnectTimeout 30";
};
};
testScript = { nodes }: ''
# fmt: off
import subprocess
start_all()
# Create an SSH key on the client.
subprocess.run([
"${hostPkgs.openssh}/bin/ssh-keygen", "-t", "ed25519", "-f", "key", "-N", ""
], capture_output=True, check=True)
client.succeed("mkdir -p -m 700 /root/.ssh")
client.copy_from_host("key", "/root/.ssh/id_ed25519")
client.succeed("chmod 600 /root/.ssh/id_ed25519")
# Install the SSH key on the builders.
client.wait_for_unit("network.target")
for builder in [builder1, builder2]:
builder.succeed("mkdir -p -m 700 /root/.ssh")
builder.copy_from_host("key.pub", "/root/.ssh/authorized_keys")
builder.wait_for_unit("sshd")
client.succeed(f"ssh -o StrictHostKeyChecking=no {builder.name} 'echo hello world'")
# Perform a build and check that it was performed on the builder.
out = client.succeed(
"nix-build ${expr nodes.client.config 1} 2> build-output",
"grep -q Hello build-output"
)
builder1.succeed(f"test -e {out}")
# And a parallel build.
paths = client.succeed(r'nix-store -r $(nix-instantiate ${expr nodes.client.config 2})\!out $(nix-instantiate ${expr nodes.client.config 3})\!out')
out1, out2 = paths.split()
builder1.succeed(f"test -e {out1} -o -e {out2}")
builder2.succeed(f"test -e {out1} -o -e {out2}")
# And a failing build.
client.fail("nix-build ${expr nodes.client.config 5}")
# Test whether the build hook automatically skips unavailable builders.
builder1.block()
client.succeed("nix-build ${expr nodes.client.config 4}")
'';
}
|
