tests: implement --xtrace in complete-run.pl

testcases/lib/SocketActivation.pm

@@ -124,6 +124,14 @@ sub activate_i3 {
                      'sh -c "export LISTEN_PID=\$\$; ' . $cmd . '"';
         }
 
+        if ($args{xtrace}) {
+            my $out = "$outdir/xtrace-for-$test.log";
+
+            # See comment in $args{strace} branch.
+            $cmd = qq|xtrace -n -o "$out" -- | .
+                     'sh -c "export LISTEN_PID=\$\$; ' . $cmd . '"';
+        }
+
         # We need to use the shell due to using output redirections.
         exec '/bin/sh', '-c', $cmd;
 

testcases/lib/TestWorker.pm

@@ -105,12 +105,13 @@ sub worker_wait {
             $test->failure_output(\*STDERR);
             $test->todo_output(\*STDOUT);
 
-            @ENV{qw(DISPLAY TESTNAME OUTDIR VALGRIND STRACE COVERAGE RESTART)}
+            @ENV{qw(DISPLAY TESTNAME OUTDIR VALGRIND STRACE XTRACE COVERAGE RESTART)}
                 = ($self->{display},
                    basename($file),
                    $outdir,
                    $options->{valgrind},
                    $options->{strace},
+                   $options->{xtrace},
                    $options->{coverage},
                    $options->{restart});
 

testcases/lib/i3test.pm

@@ -547,6 +547,7 @@ sub launch_with_config {
         testname => $ENV{TESTNAME},
         valgrind => $ENV{VALGRIND},
         strace => $ENV{STRACE},
+        xtrace => $ENV{XTRACE},
         restart => $ENV{RESTART},
         cv => $cv,
         dont_create_temp_dir => $args{dont_create_temp_dir},