Support running dmesg -T on platforms that require sudo

# Print out any Out of Memory killed process messages.

- command: shell.exec

  params:

    system_log: true

    working_dir: src # Temporary files created in src will be cleaned up in "pre".

    script: |

      ${set_sudo}

      # Use dmesg -T option, if supported, to display timestamps.

      dmesg=dmesg

      dmesg -T > /dev/null 2>&1

      if [ $? -eq 0 ]; then

        dmesg="dmesg -T"

      fi

      $sudo $dmesg 2> /dev/null > dmesg.txt

      if [ $? -ne 0 ]; then

        echo "Cannot check for OOM (Out of memory) killed processes on this platform"

        exit 0

      fi

      egrep -i '(Out of memory|OOM[- ]killer|Killed process)' dmesg.txt > oom.txt

      if [ -s oom.txt ]; then

        echo "OOM (Out of memory) killed processes detected"

        cat oom.txt

      else

        echo "No OOM (Out of memory) killed processes detected"

      fi