to only look for the mysqld binary (and english error strings) and assume the
datadir from that. Then, if that datadir turns out to not exist, startup will
fail. This avoids the behavior where mysqld_safe would go off and run a totally
different binary because the data directory had been moved (even when --datadir
was specified on the command line). (Bug #7249)


scripts/mysqld_safe.sh:
  Don't actually verify that datadir exists when
  using relatively-located mysqld -- just assume
  that it does and either let it fail when it
  doesn't, or do the right thing when datadir
  is then set via the command line or my.cnf file.