Bug#17002 mysql-test-run as root user

 - Add test to see if tests are running with root permissions
 - Disables tests that uses chmod if that is the case


mysql-test/mysql-test-run.pl:
  Add test to check if mysql-test-run is run with root permission. 
  Set environment variable MYSQL_TEST_ROOT to 'YES' or 'NO'.
mysql-test/t/information_schema.test:
  Disable test if running as root
mysql-test/t/rpl_rotate_logs.test:
  Disable test if running as root.
mysql-test/include/not_as_root.inc:
  New BitKeeper file ``mysql-test/include/not_as_root.inc''
mysql-test/r/not_as_root.require:
  New BitKeeper file ``mysql-test/r/not_as_root.require''

mysql-test/include/not_as_root.inc

+-- require r/not_as_root.require
+disable_query_log;
+select $MYSQL_TEST_ROOT as running_as_root;
+enable_query_log;

mysql-test/mysql-test-run.pl

@@ -338,6 +338,7 @@ sub environment_setup ();
 sub kill_running_server ();
 sub kill_and_cleanup ();
 sub check_ssl_support ();
+sub check_running_as_root();
 sub check_ndbcluster_support ();
 sub ndbcluster_install ();
 sub ndbcluster_start ($);
@@ -376,6 +377,7 @@ sub main () {
 
   check_ndbcluster_support();
   check_ssl_support();
+  check_running_as_root();
 
   environment_setup();
   signal_setup();
@@ -1337,6 +1339,33 @@ sub kill_and_cleanup () {
 }
 
 
+sub  check_running_as_root () {
+  # Check if running as root
+  # i.e a file can be read regardless what mode we set it to
+  my $test_file= "test_running_as_root.txt";
+  mtr_tofile($test_file, "MySQL");
+  chmod(oct("0000"), $test_file);
+
+  my $result="";
+  if (open(FILE,"<",$test_file))
+  {
+    $result= join('', <FILE>);
+    close FILE;
+  }
+
+  chmod(oct("0755"), $test_file);
+  unlink($test_file);
+
+  $ENV{'MYSQL_TEST_ROOT'}= "NO";
+  if ($result eq "MySQL")
+  {
+    mtr_warning("running this script as _root_ will cause some " .
+                "tests to be skipped");
+    $ENV{'MYSQL_TEST_ROOT'}= "YES";
+  }
+}
+
+
 
 sub check_ssl_support () {
 

mysql-test/r/not_as_root.require

+running_as_root
+NO

mysql-test/t/information_schema.test

 # This test  uses grants, which can't get tested for embedded server
 -- source include/not_embedded.inc
 
+# This test uses chmod, can't be run with root permissions
+-- source include/not_as_root.inc
+
 # Test for information_schema.schemata &
 # show databases
 

mysql-test/t/rpl_rotate_logs.test

+# This test uses chmod, can't be run with root permissions
+-- source include/not_as_root.inc
+
 #
 # Test is run with max_binlog_size=2048 to force automatic rotation of the
 # binary log