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|
{ config, pkgs, lib, ... }:
let
# Make sure we use a Nix version prior to 1.12, because taalo currently uses
# the legacy SSH protocol, so we can't use the ssh-ng store backend here.
#
# Apart from that, even if we would use the new store backend we would break
# the taalo-build backend for Nix 1.11.
inherit (import (import (../../../../../nixpkgs-path.nix)) {
config = {};
}) nix;
backend = pkgs.writeScript "taalo-realize-backend" ''
#!${pkgs.perl}/bin/perl -I${nix}/lib/perl5/site_perl
use strict;
use Nix::CopyClosure;
use Nix::SSH;
use IPC::Open2;
binmode STDERR, ":encoding(utf8)";
my ($from, $to);
my $dest = 'nix-remote-build@taalo.headcounter.org';
my $cmd = "exec ssh $dest -C -- nix-store --serve --write";
my $pid = open2($from, $to, $cmd);
# Do the handshake.
my $magic;
eval {
my $SERVE_MAGIC_1 = 0x390c9deb; # FIXME
my $clientVersion = 0x200;
syswrite($to, pack("L<x4L<x4", $SERVE_MAGIC_1, $clientVersion))
or die;
$magic = readInt($from);
};
die "unable to connect to taalo\n" if $@;
die "did not get valid handshake from taalo\n" if $magic != 0x5452eecb;
my $serverVersion = readInt($from);
die "unsupported server version\n"
if $serverVersion < 0x200 || $serverVersion >= 0x300;
Nix::CopyClosure::copyToOpen(
$from, $to, "taalo", \@ARGV, 0, 0, 0, 1
);
writeInt(6, $to) or die;
writeStrings(\@ARGV, $to);
writeInt(0, $to);
writeInt(0, $to);
my $res = readInt($from);
close $to;
waitpid($pid, 0);
exit $res;
'';
taalo-realize = pkgs.writeScriptBin "taalo-realize" ''
#!${pkgs.stdenv.shell}
if [ $# -le 0 -o "$1" = "--help" -o "$1" = "-h" ]; then
echo "Usage: $0 DERIVATION..." >&2
exit 1
fi
exec ${backend} "$@"
'';
taalo-build = pkgs.writeScriptBin "taalo-build" ''
#!${pkgs.stdenv.shell}
if tmpdir="$("${pkgs.coreutils}/bin/mktemp" -d -t taalo-build.XXXXXX)"; then
trap "rm -rf '$tmpdir'" EXIT
set -o pipefail
drvs="$(nix-instantiate --add-root "$tmpdir/derivation" --indirect "$@" \
| cut -d'!' -f1)" || exit 1
${backend} $("${pkgs.coreutils}/bin/readlink" $drvs)
exit $?
else
echo "Unable to create temporary directory for build link!" >&2
exit 1
fi
'';
in {
options.vuizvui.user.aszlig.programs.taalo-build = {
enable = lib.mkEnableOption "aszlig's build helpers for remote builds";
};
config = lib.mkIf config.vuizvui.user.aszlig.programs.taalo-build.enable {
environment.systemPackages = [ taalo-realize taalo-build ];
};
}
|
