log all mtr output in vardir/log/stdout.log

despite the name, it logs both stdout and stderr

mysql-test/lib/My/SafeProcess/Base.pm

@@ -186,8 +186,10 @@ sub create_process {
   # it and any childs(that hasn't changed group themself)
   setpgrp(0,0) if $opts{setpgrp};
 
-  if ( $output and !open(STDOUT, $open_mode, $output) ) {
-    croak("can't redirect STDOUT to '$output': $!");
+  if ( $output ) {
+    close STDOUT;
+    open(STDOUT, $open_mode, $output)
+      or croak "can't redirect STDOUT to '$output': $!";
   }
 
   if ( $error ) {
@@ -196,8 +198,10 @@ sub create_process {
 	croak("can't dup STDOUT: $!");
       }
     }
-    elsif ( ! open(STDERR, $open_mode, $error) ) {
-      croak("can't redirect STDERR to '$error': $!");
+    else {
+      close STDERR;
+      open(STDERR, $open_mode, $error)
+        or croak "can't redirect STDERR to '$error': $!";
     }
   }
 

mysql-test/lib/My/Tee.pm

+package My::Tee;
+
+# see PerlIO::via
+
+our $copyfh;
+
+sub PUSHED
+{
+  open($copyfh, '>', "$::opt_vardir/log/stdout.log")
+    or die "open(>$::opt_vardir/log/stdout.log): $!"
+      unless $copyfh;
+ bless { }, shift;
+}
+
+sub WRITE
+{
+ my ($obj, $buf, $fh) = @_;
+ print $fh $buf;
+ print $copyfh $buf;
+ return length($buf);
+}
+
+1;

mysql-test/mysql-test-run.pl

@@ -91,6 +91,7 @@ use My::Platform;
 use My::SafeProcess;
 use My::ConfigFactory;
 use My::Options;
+use My::Tee;
 use My::Find;
 use My::SysInfo;
 use My::CoreDump;
@@ -392,6 +393,11 @@ sub main {
   initialize_servers();
   init_timers();
 
+  unless (IS_WINDOWS) {
+    binmode(STDOUT,":via(My::Tee)") or die "binmode(STDOUT, :via(My::Tee)):$!";
+    binmode(STDERR,":via(My::Tee)") or die "binmode(STDERR, :via(My::Tee)):$!";
+  }
+
   mtr_report("Checking supported features...");
 
   executable_setup();
@@ -6280,7 +6286,8 @@ sub xterm_stat {
     my $done = $num_tests - $left;
     my $spent = time - $^T;
 
-    printf "\e];mtr: spent %s on %d tests. %s (%d tests) left\a",
+    syswrite STDOUT, sprintf
+           "\e];mtr: spent %s on %d tests. %s (%d tests) left\a",
            time_format($spent), $done,
            time_format($spent/$done * $left), $left;
   }