Check if innodb_lock_wait_timeout exists, don't crash.

bin/pt-online-schema-change

@@ -5030,7 +5030,11 @@ sub main {
          PTDEBUG && _d($dbh, $sql);
          my (undef, $curr_lwt) = $dbh->selectrow_array($sql);
          PTDEBUG && _d('innodb_lock_wait_timeout on server:', $curr_lwt);
-         if ( $curr_lwt > $lock_wait_timeout ) { 
+         if ( !defined $curr_lwt ) {
+            PTDEBUG && _d('innodb_lock_wait_timeout does not exist;',
+               'InnoDB is probably disabled');
+         }
+         elsif ( $curr_lwt > $lock_wait_timeout ) { 
             warn "Failed to $set_lwt: $EVAL_ERROR\n"
                . "The current innodb_lock_wait_timeout value "
                . "$curr_lwt is greater than the --lock-wait-timeout "

t/pt-online-schema-change/skip_innodb.t

@@ -0,0 +1,60 @@
+#!/usr/bin/env perl
+
+BEGIN {
+   die "The PERCONA_TOOLKIT_BRANCH environment variable is not set.\n"
+      unless $ENV{PERCONA_TOOLKIT_BRANCH} && -d $ENV{PERCONA_TOOLKIT_BRANCH};
+   unshift @INC, "$ENV{PERCONA_TOOLKIT_BRANCH}/lib";
+};
+
+use strict;
+use warnings FATAL => 'all';
+use English qw(-no_match_vars);
+use Test::More;
+
+use PerconaTest;
+use Sandbox;
+require "$trunk/bin/pt-online-schema-change";
+
+diag(`$trunk/sandbox/stop-sandbox 12348 >/dev/null`);
+diag(`SKIP_INNODB=1 $trunk/sandbox/start-sandbox master 12348 >/dev/null`);
+
+my $dp = new DSNParser(opts=>$dsn_opts);
+my $sb = new Sandbox(basedir => '/tmp', DSNParser => $dp);
+my $master_dbh = $sb->get_dbh_for('master1');
+
+if ( !$master_dbh ) {
+   plan skip_all => 'Cannot connect to sandbox master 12348';
+}
+else {
+   plan tests => 2;
+}
+
+my $master_dsn = 'h=127.1,P=12348,u=msandbox,p=msandbox';
+my @args       = (qw(--lock-wait-timeout 3), '--max-load', ''); 
+my $output;
+my $retval;
+
+$output = output(
+   sub { $retval = pt_online_schema_change::main(@args,
+      "$master_dsn,D=mysql,t=user", "--alter", "add column (foo int)",
+      qw(--dry-run)) },
+   stderr => 1,
+);
+
+like(
+   $output,
+   qr/`mysql`.`user`/,
+   "Ran without InnoDB (bug 994010)"
+);
+
+is(
+   $retval,
+   0,
+   "0 exit status (bug 994010)"
+);
+
+# #############################################################################
+# Done.
+# #############################################################################
+diag(`$trunk/sandbox/stop-sandbox 12348 >/dev/null`);
+exit;

t/pt-table-checksum/skip_innodb.t

@@ -55,13 +55,13 @@ $output = output(
 like(
    $output,
    qr/mysql/,
-   "Ran without InnoDB (bug 994010)"
+   "Ran without InnoDB (bug 996110)"
 );
 
 is(
    $retval,
    0,
-   "0 exit status (bug 994010)"
+   "0 exit status (bug 996110)"
 );
 
 # #############################################################################