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# Test Nix's remote build feature.
{ pkgs, ... }:
let
# The configuration of the build slaves.
slave =
{ config, pkgs, ... }:
{ services.openssh.enable = true;
virtualisation.writableStore = true;
};
# 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" "echo Hello; mkdir $out; cat /proc/sys/kernel/hostname > $out/host; sleep 3" ];
}
'';
in
{
nodes =
{ slave1 = slave;
slave2 = slave;
client =
{ config, pkgs, ... }:
{ nix.maxJobs = 0; # force remote building
nix.distributedBuilds = true;
nix.buildMachines =
[ { hostName = "slave1";
sshUser = "root";
sshKey = "/root/.ssh/id_dsa";
system = "i686-linux";
maxJobs = 1;
}
{ hostName = "slave2";
sshUser = "root";
sshKey = "/root/.ssh/id_dsa";
system = "i686-linux";
maxJobs = 1;
}
];
virtualisation.writableStore = true;
virtualisation.pathsInNixDB = [ config.system.build.extraUtils ];
};
};
testScript = { nodes }:
''
startAll;
# Create an SSH key on the client.
my $key = `${pkgs.openssh}/bin/ssh-keygen -t dsa -f key -N ""`;
$client->succeed("mkdir -m 700 /root/.ssh");
$client->copyFileFromHost("key", "/root/.ssh/id_dsa");
$client->succeed("chmod 600 /root/.ssh/id_dsa");
# Install the SSH key on the slaves.
foreach my $slave ($slave1, $slave2) {
$slave->succeed("mkdir -m 700 /root/.ssh");
$slave->copyFileFromHost("key.pub", "/root/.ssh/authorized_keys");
$slave->waitForJob("sshd");
$client->succeed("ssh -o StrictHostKeyChecking=no " . $slave->name() . " 'echo hello world'");
}
# Perform a build and check that it was performed on the slave.
my $out = $client->succeed("nix-build ${expr nodes.client.config 1}");
$slave1->succeed("test -e $out");
# And a parallel build.
my ($out1, $out2) = split /\s/,
$client->succeed("nix-store -r \$(nix-instantiate ${expr nodes.client.config 2} ${expr nodes.client.config 3})");
$slave1->succeed("test -e $out1 -o -e $out2");
$slave2->succeed("test -e $out1 -o -e $out2");
# Test whether the build hook automatically skips unavailable slaves.
$slave1->block;
$client->succeed("nix-build ${expr nodes.client.config 4}");
'';
}
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