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#! /somewhere/perl -w
use strict;
use Machine;
use Term::ReadLine;
use IO::File;
use IO::Pty;
use Logger;
use Cwd;
use POSIX qw(_exit dup2);
$SIG{PIPE} = 'IGNORE'; # because Unix domain sockets may die unexpectedly
STDERR->autoflush(1);
my $log = new Logger;
# Start vde_switch for each network required by the test.
my %vlans;
foreach my $vlan (split / /, $ENV{VLANS} || "") {
next if defined $vlans{$vlan};
# Start vde_switch as a child process. We don't run it in daemon
# mode because we want the child process to be cleaned up when we
# die. Since we have to make sure that the control socket is
# ready, we send a dummy command to vde_switch (via stdin) and
# wait for a reply. Note that vde_switch requires stdin to be a
# TTY, so we create one.
$log->log("starting VDE switch for network $vlan");
my $socket = Cwd::abs_path "./vde$vlan.ctl";
my $pty = new IO::Pty;
my ($stdoutR, $stdoutW); pipe $stdoutR, $stdoutW;
my $pid = fork(); die "cannot fork" unless defined $pid;
if ($pid == 0) {
dup2(fileno($pty->slave), 0);
dup2(fileno($stdoutW), 1);
exec "vde_switch -s $socket" or _exit(1);
}
close $stdoutW;
print $pty "version\n";
readline $stdoutR or die "cannot start vde_switch";
$ENV{"QEMU_VDE_SOCKET_$vlan"} = $socket;
$vlans{$vlan} = $pty;
die unless -e "$socket/ctl";
}
my %vms;
my $context = "";
sub createMachine {
my ($args) = @_;
my $vm = Machine->new({%{$args}, log => $log, redirectSerial => ($ENV{USE_SERIAL} // "0") ne "1"});
$vms{$vm->name} = $vm;
return $vm;
}
foreach my $vmScript (@ARGV) {
my $vm = createMachine({startCommand => $vmScript});
$context .= "my \$" . $vm->name . " = \$vms{'" . $vm->name . "'}; ";
}
sub startAll {
$log->nest("starting all VMs", sub {
$_->start foreach values %vms;
});
}
# Wait until all VMs have terminated.
sub joinAll {
$log->nest("waiting for all VMs to finish", sub {
$_->waitForShutdown foreach values %vms;
});
}
# In interactive tests, this allows the non-interactive test script to
# be executed conveniently.
sub testScript {
eval "$context $ENV{testScript};\n";
warn $@ if $@;
}
my $nrTests = 0;
my $nrSucceeded = 0;
sub subtest {
my ($name, $coderef) = @_;
$log->nest("subtest: $name", sub {
$nrTests++;
eval { &$coderef };
if ($@) {
$log->log("error: $@", { error => 1 });
} else {
$nrSucceeded++;
}
});
}
sub runTests {
if (defined $ENV{tests}) {
$log->nest("running the VM test script", sub {
eval "$context $ENV{tests}";
if ($@) {
$log->log("error: $@", { error => 1 });
die $@;
}
}, { expanded => 1 });
} else {
my $term = Term::ReadLine->new('nixos-vm-test');
$term->ReadHistory;
while (defined ($_ = $term->readline("> "))) {
eval "$context $_\n";
warn $@ if $@;
}
$term->WriteHistory;
}
# Copy the kernel coverage data for each machine, if the kernel
# has been compiled with coverage instrumentation.
$log->nest("collecting coverage data", sub {
foreach my $vm (values %vms) {
my $gcovDir = "/sys/kernel/debug/gcov";
next unless $vm->isUp();
my ($status, $out) = $vm->execute("test -e $gcovDir");
next if $status != 0;
# Figure out where to put the *.gcda files so that the
# report generator can find the corresponding kernel
# sources.
my $kernelDir = $vm->mustSucceed("echo \$(dirname \$(readlink -f /run/current-system/kernel))/.build/linux-*");
chomp $kernelDir;
my $coverageDir = "/tmp/xchg/coverage-data/$kernelDir";
# Copy all the *.gcda files.
$vm->execute("for d in $gcovDir/nix/store/*/.build/linux-*; do for i in \$(cd \$d && find -name '*.gcda'); do echo \$i; mkdir -p $coverageDir/\$(dirname \$i); cp -v \$d/\$i $coverageDir/\$i; done; done");
}
});
if ($nrTests != 0) {
$log->log("$nrSucceeded out of $nrTests tests succeeded",
($nrSucceeded < $nrTests ? { error => 1 } : { }));
}
}
# Create an empty raw virtual disk with the given name and size (in
# MiB).
sub createDisk {
my ($name, $size) = @_;
system("qemu-img create -f raw $name ${size}M") == 0
or die "cannot create image of size $size";
}
END {
$log->nest("cleaning up", sub {
foreach my $vm (values %vms) {
if ($vm->{pid}) {
$log->log("killing " . $vm->{name} . " (pid " . $vm->{pid} . ")");
kill 9, $vm->{pid};
}
}
});
$log->close();
}
runTests;
exit ($nrSucceeded < $nrTests ? 1 : 0);