522 lines
12 KiB
Perl
522 lines
12 KiB
Perl
package Machine;
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use strict;
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use threads;
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use Socket;
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use IO::Handle;
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use POSIX qw(dup2);
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use FileHandle;
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use Cwd;
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use File::Basename;
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# Stuff our PID in the multicast address/port to prevent collissions
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# with other NixOS VM networks. See
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# http://www.iana.org/assignments/multicast-addresses/.
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my $mcastPrefix = "232.18";
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my $mcastSuffix = ($$ >> 8) . ":" . (64000 + ($$ & 0xff));
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print STDERR "using multicast addresses $mcastPrefix.<vlan>.$mcastSuffix\n";
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for (my $n = 0; $n < 256; $n++) {
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$ENV{"QEMU_MCAST_ADDR_$n"} = "$mcastPrefix.$n.$mcastSuffix";
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}
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my $showGraphics = defined $ENV{'DISPLAY'};
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sub new {
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my ($class, $args) = @_;
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my $startCommand = $args->{startCommand};
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my $name = $args->{name};
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if (!$name) {
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$startCommand =~ /run-(.*)-vm$/;
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$name = $1 || "machine";
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}
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if (!$startCommand) {
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# !!! merge with qemu-vm.nix.
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$startCommand =
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"qemu-system-x86_64 -m 384 " .
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"-net nic,model=virtio -net user,\$QEMU_NET_OPTS \$QEMU_OPTS ";
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$startCommand .= "-drive file=" . Cwd::abs_path($args->{hda}) . ",if=virtio,boot=on,werror=report "
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if defined $args->{hda};
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$startCommand .= "-cdrom $args->{cdrom} "
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if defined $args->{cdrom};
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$startCommand .= $args->{qemuFlags} || "";
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} else {
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$startCommand = Cwd::abs_path $startCommand;
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}
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my $tmpDir = $ENV{'TMPDIR'} || "/tmp";
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my $self = {
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startCommand => $startCommand,
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name => $name,
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booted => 0,
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pid => 0,
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connected => 0,
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socket => undef,
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stateDir => "$tmpDir/vm-state-$name",
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monitor => undef,
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log => $args->{log},
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};
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mkdir $self->{stateDir}, 0700;
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bless $self, $class;
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return $self;
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}
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sub log {
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my ($self, $msg) = @_;
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$self->{log}->log($msg, { machine => $self->{name} });
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}
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sub nest {
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my ($self, $msg, $coderef, $attrs) = @_;
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$self->{log}->nest($msg, $coderef, { %{$attrs || {}}, machine => $self->{name} });
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}
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sub name {
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my ($self) = @_;
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return $self->{name};
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}
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sub stateDir {
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my ($self) = @_;
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return $self->{stateDir};
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}
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sub start {
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my ($self) = @_;
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return if $self->{booted};
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$self->log("starting vm");
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# Create a socket pair for the serial line input/output of the VM.
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my ($serialP, $serialC);
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socketpair($serialP, $serialC, PF_UNIX, SOCK_STREAM, 0) or die;
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# Create a Unix domain socket to which QEMU's monitor will connect.
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my $monitorPath = $self->{stateDir} . "/monitor";
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unlink $monitorPath;
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my $monitorS;
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socket($monitorS, PF_UNIX, SOCK_STREAM, 0) or die;
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bind($monitorS, sockaddr_un($monitorPath)) or die "cannot bind monitor socket: $!";
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listen($monitorS, 1) or die;
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# Create a Unix domain socket to which the root shell in the guest will connect.
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my $shellPath = $self->{stateDir} . "/shell";
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unlink $shellPath;
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my $shellS;
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socket($shellS, PF_UNIX, SOCK_STREAM, 0) or die;
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bind($shellS, sockaddr_un($shellPath)) or die "cannot bind shell socket: $!";
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listen($shellS, 1) or die;
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# Start the VM.
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my $pid = fork();
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die if $pid == -1;
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if ($pid == 0) {
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close $serialP;
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close $monitorS;
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close $shellS;
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open NUL, "</dev/null" or die;
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dup2(fileno(NUL), fileno(STDIN));
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dup2(fileno($serialC), fileno(STDOUT));
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dup2(fileno($serialC), fileno(STDERR));
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$ENV{TMPDIR} = $self->{stateDir};
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$ENV{USE_TMPDIR} = 1;
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$ENV{QEMU_OPTS} =
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"-no-reboot -monitor unix:./monitor -chardev socket,id=shell,path=./shell " .
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($showGraphics ? "-serial stdio" : "-nographic");
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$ENV{QEMU_NET_OPTS} = "guestfwd=tcp:10.0.2.6:23-chardev:shell";
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$ENV{QEMU_KERNEL_PARAMS} = "hostTmpDir=$ENV{TMPDIR}";
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chdir $self->{stateDir} or die;
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exec $self->{startCommand};
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die "running VM script: $!";
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}
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# Process serial line output.
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close $serialC;
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threads->create(\&processSerialOutput, $self, $serialP)->detach;
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sub processSerialOutput {
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my ($self, $serialP) = @_;
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while (<$serialP>) {
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chomp;
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s/\r$//;
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print STDERR $self->{name}, "# $_\n";
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$self->{log}->{logQueue}->enqueue({msg => $_, machine => $self->{name}}); # !!!
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}
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}
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eval {
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local $SIG{CHLD} = sub { die "QEMU died prematurely\n"; };
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# Wait until QEMU connects to the monitor.
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accept($self->{monitor}, $monitorS) or die;
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# Wait until QEMU connects to the root shell socket. QEMU
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# does so immediately; this doesn't mean that the root shell
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# has connected yet inside the guest.
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accept($self->{socket}, $shellS) or die;
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$self->{socket}->autoflush(1);
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};
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die "$@" if $@;
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$self->waitForMonitorPrompt;
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$self->log("QEMU running (pid $pid)");
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$self->{pid} = $pid;
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$self->{booted} = 1;
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}
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# Send a command to the monitor and wait for it to finish. TODO: QEMU
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# also has a JSON-based monitor interface now, but it doesn't support
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# all commands yet. We should use it once it does.
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sub sendMonitorCommand {
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my ($self, $command) = @_;
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$self->log("sending monitor command: $command");
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syswrite $self->{monitor}, "$command\n";
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return $self->waitForMonitorPrompt;
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}
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# Wait until the monitor sends "(qemu) ".
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sub waitForMonitorPrompt {
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my ($self) = @_;
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my $res = "";
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my $s;
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while (sysread($self->{monitor}, $s, 1024)) {
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$res .= $s;
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last if $res =~ s/\(qemu\) $//;
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}
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return $res;
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}
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# Call the given code reference repeatedly, with 1 second intervals,
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# until it returns 1 or a timeout is reached.
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sub retry {
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my ($coderef) = @_;
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my $n;
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for ($n = 0; $n < 900; $n++) {
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return if &$coderef;
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sleep 1;
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}
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die "action timed out after $n seconds";
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}
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sub connect {
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my ($self) = @_;
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return if $self->{connected};
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$self->nest("waiting for the VM to finish booting", sub {
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$self->start;
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local $SIG{ALRM} = sub { die "timed out waiting for the guest to connect\n"; };
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alarm 300;
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readline $self->{socket} or die;
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alarm 0;
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$self->log("connected to guest root shell");
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$self->{connected} = 1;
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});
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}
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sub waitForShutdown {
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my ($self) = @_;
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return unless $self->{booted};
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$self->nest("waiting for the VM to power off", sub {
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waitpid $self->{pid}, 0;
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$self->{pid} = 0;
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$self->{booted} = 0;
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$self->{connected} = 0;
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});
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}
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sub isUp {
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my ($self) = @_;
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return $self->{booted} && $self->{connected};
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}
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sub execute_ {
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my ($self, $command) = @_;
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$self->connect;
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print { $self->{socket} } ("( $command ); echo '|!=EOF' \$?\n");
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my $out = "";
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while (1) {
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my $line = readline($self->{socket});
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die "connection to VM lost unexpectedly" unless defined $line;
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#$self->log("got line: $line");
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if ($line =~ /^(.*)\|\!\=EOF\s+(\d+)$/) {
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$out .= $1;
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$self->log("exit status $2");
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return ($2, $out);
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}
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$out .= $line;
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}
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}
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sub execute {
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my ($self, $command) = @_;
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my @res;
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$self->nest("running command: $command", sub {
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@res = $self->execute_($command);
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});
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return @res;
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}
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sub succeed {
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my ($self, @commands) = @_;
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my $res;
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foreach my $command (@commands) {
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$self->nest("must succeed: $command", sub {
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my ($status, $out) = $self->execute_($command);
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if ($status != 0) {
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$self->log("output: $out");
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die "command `$command' did not succeed (exit code $status)\n";
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}
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$res .= $out;
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});
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}
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return $res;
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}
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sub mustSucceed {
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succeed @_;
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}
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sub waitUntilSucceeds {
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my ($self, $command) = @_;
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$self->nest("waiting for success: $command", sub {
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retry sub {
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my ($status, $out) = $self->execute($command);
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return 1 if $status == 0;
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};
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});
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}
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sub waitUntilFails {
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my ($self, $command) = @_;
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$self->nest("waiting for failure: $command", sub {
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retry sub {
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my ($status, $out) = $self->execute($command);
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return 1 if $status != 0;
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};
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});
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}
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sub fail {
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my ($self, $command) = @_;
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$self->nest("must fail: $command", sub {
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my ($status, $out) = $self->execute_($command);
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die "command `$command' unexpectedly succeeded"
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if $status == 0;
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});
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}
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sub mustFail {
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fail @_;
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}
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# Wait for an Upstart job to reach the "running" state.
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sub waitForJob {
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my ($self, $jobName) = @_;
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$self->nest("waiting for job ‘$jobName’", sub {
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retry sub {
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my ($status, $out) = $self->execute("initctl status $jobName");
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return 1 if $out =~ /start\/running/;
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};
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});
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}
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# Wait until the specified file exists.
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sub waitForFile {
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my ($self, $fileName) = @_;
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$self->nest("waiting for file ‘$fileName’", sub {
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retry sub {
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my ($status, $out) = $self->execute("test -e $fileName");
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return 1 if $status == 0;
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}
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});
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}
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sub startJob {
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my ($self, $jobName) = @_;
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$self->execute("initctl start $jobName");
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my ($status, $out) = $self->execute("initctl status $jobName");
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die "failed to start $jobName" unless $out =~ /start\/running/;
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}
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sub stopJob {
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my ($self, $jobName) = @_;
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$self->execute("initctl stop $jobName");
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my ($status, $out) = $self->execute("initctl status $jobName");
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die "failed to stop $jobName" unless $out =~ /stop\/waiting/;
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}
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# Wait until the machine is listening on the given TCP port.
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sub waitForOpenPort {
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my ($self, $port) = @_;
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$self->nest("waiting for TCP port $port", sub {
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retry sub {
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my ($status, $out) = $self->execute("nc -z localhost $port");
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return 1 if $status == 0;
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}
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});
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}
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# Wait until the machine is not listening on the given TCP port.
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sub waitForClosedPort {
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my ($self, $port) = @_;
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retry sub {
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my ($status, $out) = $self->execute("nc -z localhost $port");
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return 1 if $status != 0;
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}
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}
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sub shutdown {
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my ($self) = @_;
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return unless $self->{booted};
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$self->execute("poweroff");
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$self->waitForShutdown;
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}
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sub crash {
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my ($self) = @_;
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return unless $self->{booted};
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$self->sendMonitorCommand("quit");
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$self->waitForShutdown;
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}
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# Make the machine unreachable by shutting down eth1 (the multicast
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# interface used to talk to the other VMs). We keep eth0 up so that
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# the test driver can continue to talk to the machine.
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sub block {
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my ($self) = @_;
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$self->sendMonitorCommand("set_link virtio-net-pci.1 off");
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}
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# Make the machine reachable.
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sub unblock {
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my ($self) = @_;
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$self->sendMonitorCommand("set_link virtio-net-pci.1 on");
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}
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# Take a screenshot of the X server on :0.0.
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sub screenshot {
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my ($self, $filename) = @_;
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my $dir = $ENV{'out'} || Cwd::abs_path(".");
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$filename = "$dir/${filename}.png" if $filename =~ /^\w+$/;
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my $tmp = "${filename}.ppm";
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my $name = basename($filename);
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$self->nest("making screenshot ‘$name’", sub {
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$self->sendMonitorCommand("screendump $tmp");
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system("convert $tmp ${filename}") == 0
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or die "cannot convert screenshot";
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unlink $tmp;
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}, { image => $name } );
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}
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# Wait until it is possible to connect to the X server. Note that
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# testing the existence of /tmp/.X11-unix/X0 is insufficient.
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sub waitForX {
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my ($self, $regexp) = @_;
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retry sub {
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my ($status, $out) = $self->execute("xwininfo -root > /dev/null 2>&1");
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return 1 if $status == 0;
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}
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}
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sub getWindowNames {
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my ($self) = @_;
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my $res = $self->mustSucceed(
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q{xwininfo -root -tree | sed 's/.*0x[0-9a-f]* \"\([^\"]*\)\".*/\1/; t; d'});
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return split /\n/, $res;
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}
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sub waitForWindow {
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my ($self, $regexp) = @_;
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retry sub {
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my @names = $self->getWindowNames;
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foreach my $n (@names) {
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return 1 if $n =~ /$regexp/;
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}
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}
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}
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sub copyFileFromHost {
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my ($self, $from, $to) = @_;
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my $s = `cat $from` or die;
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$self->mustSucceed("echo '$s' > $to"); # !!! escaping
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}
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sub sendKeys {
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my ($self, @keys) = @_;
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foreach my $key (@keys) {
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$key = "spc" if $key eq " ";
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$key = "ret" if $key eq "\n";
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$self->sendMonitorCommand("sendkey $key");
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}
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}
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sub sendChars {
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my ($self, $chars) = @_;
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$self->nest("sending keys ‘$chars’", sub {
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$self->sendKeys(split //, $chars);
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});
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}
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1;
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