Description of problem:

When running a command with rlRun using the -s option (e.g. rlRun -s "$cmd" 0) on RHEL5, it logs a warning message:
:: [ WARNING  ] :: rlRun: `set -o pipefail` not supported, exit code of command will not be checked correctly.
even though pipefail is supported in bash versions greater than 3.

I have checked the rlRun function in /usr/share/beakerlib/testing.sh, it uses grep to check for pipefail support:
  if set -o | grep -q '^pipefail\s'; then
    local pipefail=true
    if set -o | grep -q '^pipefail\s*off$'; then
      set -o pipefail
      local pipefail=false
    fi
  else
    rlLogWarning "rlRun: \`set -o pipefail\` not supported, exit code of command will not be checked correctly."
  fi

I did some manual checks on RHEL 5.8:
[root@dhcp-27-xx tmp]# set -o
allexport       off
...
pipefail        off
...
xtrace          off
[root@dhcp-27-xx tmp]# set -o | grep '^pipefail\s'
[root@dhcp-27-xx tmp]# set -o | grep '^pipefail'
pipefail        off
[root@dhcp-27-xx tmp]# set -o | grep -E '^pipefail\s'
[root@dhcp-27-xx tmp]# set -o | grep -P '^pipefail\s'
pipefail        off
[root@dhcp-27-xx tmp]# set -o | grep '^pipefail[[:space:]]'
pipefail        off
[root@dhcp-27-xx tmp]#

As I see the problem is that \s is not recognized as a special expression for whitespaces in grep patterns on RHEL5. My suggestion would be to use [[:space:]] intstead of \s, it works on both RHEL 5 and 6.


Version-Release number of selected component (if applicable):

Red Hat Enterprise Linux Server release 5.8 (Tikanga)
bash.x86_64 3.2-32.el5
beakerlib-redhat.noarch 1-8.el5
grep.x86_64 2.5.1-55.el5


How reproducible:
100%


Steps to Reproduce:
1. Install beakerlib-redhat on RHEL5
2. run command with rlRun using -s option
  

Actual results:
Warning message is received, can not be sure about test results.


Expected results:
rlRun recognises pipefail support and runs without warnings.

Additional info: