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    else {
      warn "###WARN### Patching '$k' failed: $@";
    }
  }
}

sub run_output_tail {
  my ($self, $limit, @cmd) = @_;
  my $output;
  print STDERR "CMD: " . join(' ',@cmd) . "\n";
  print STDERR "- running (stdout+stderr redirected)...\n";
  my $rv = run3(\@cmd, \undef, \$output, \$output, { return_if_system_error => 1 } );
  my $success = ($rv == 1 && $? == 0) ? 1 : 0;
  $output = substr $output, -$limit if defined $limit; # we want just last N chars
  if (!defined($limit)) {
    print STDERR "OUTPUT:\n", $output, "\n";
  }
  elsif ($limit>0) {
    print STDERR "OUTPUT: (only last $limit chars)\n", $output, "\n";
  }
  return $success;
}

sub run_output_on_error {
  my ($self, $limit, @cmd) = @_;
  my $output;
  print STDERR "CMD: " . join(' ',@cmd) . "\n";
  print STDERR "- running (stdout+stderr redirected)...\n";
  my $rv = run3(\@cmd, \undef, \$output, \$output, { return_if_system_error => 1 } );
  my $success = ($rv == 1 && $? == 0) ? 1 : 0;
  if ($success) {
    print STDERR "- finished successfully (output suppressed)\n";
  }
  else {
    $output = substr $output, -$limit if defined $limit; # we want just last N chars
    if (!defined($limit)) {
      print STDERR "OUTPUT:\n", $output, "\n";
    }