illegal grep flag issue encountered on target system gathering date.machine_id

[chambridge]

Specify type:

• Bug

Bug severity (if applicable):

• Low

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Description:

The following fact encountered an issues on a target system:

- name: gather date.machine_id fact
  raw: ls --full-time /etc/machine-id | grep -o '[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}'
  register: date_machine_id
  ignore_errors: yes
  when: '"date.machine_id" in facts_to_collect'

Output:
grep: illegal option -- o\r\nUsage: grep -hblcnsviw pattern file . . .

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Bug Report

Version of rho:

[ 0.28, 0.29 ]

Expected behavior:

Either better error handling or obtain the date a different way on that machine.

Actual behavior:

Error message stored in the fact.