Move all of NixOS to nixos/ in preparation of the repository merge

nixos/lib/test-driver/Logger.pm

@@ -0,0 +1,70 @@
+package Logger;
+
+use strict;
+use Thread::Queue;
+use XML::Writer;
+
+sub new {
+    my ($class) = @_;
+    
+    my $logFile = defined $ENV{LOGFILE} ? "$ENV{LOGFILE}" : "/dev/null";
+    my $log = new XML::Writer(OUTPUT => new IO::File(">$logFile"));
+    
+    my $self = {
+        log => $log,
+        logQueue => Thread::Queue->new()
+    };
+    
+    $self->{log}->startTag("logfile");
+    
+    bless $self, $class;
+    return $self;
+}
+
+sub close {
+    my ($self) = @_;
+    $self->{log}->endTag("logfile");
+    $self->{log}->end;
+}
+
+sub drainLogQueue {
+    my ($self) = @_;
+    while (defined (my $item = $self->{logQueue}->dequeue_nb())) {
+        $self->{log}->dataElement("line", sanitise($item->{msg}), 'machine' => $item->{machine}, 'type' => 'serial');
+    }
+}
+
+sub maybePrefix {
+    my ($msg, $attrs) = @_;
+    $msg = $attrs->{machine} . ": " . $msg if defined $attrs->{machine};
+    return $msg;
+}
+
+sub nest {
+    my ($self, $msg, $coderef, $attrs) = @_;
+    print STDERR maybePrefix("$msg\n", $attrs);
+    $self->{log}->startTag("nest");
+    $self->{log}->dataElement("head", $msg, %{$attrs});
+    $self->drainLogQueue();
+    eval { &$coderef };
+    my $res = $@;
+    $self->drainLogQueue();
+    $self->{log}->endTag("nest");
+    die $@ if $@;
+}
+
+sub sanitise {
+    my ($s) = @_;
+    $s =~ s/[[:cntrl:]\xff]//g;
+    return $s;
+}
+
+sub log {
+    my ($self, $msg, $attrs) = @_;
+    chomp $msg;
+    print STDERR maybePrefix("$msg\n", $attrs);
+    $self->drainLogQueue();
+    $self->{log}->dataElement("line", $msg, %{$attrs});
+}
+
+1;