[LU-8993] lctl debug_daemon should warn on relative pathnames

• Type: Improvement
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.11.0
• Assignee: Steve Guminski (Inactive)
• Reporter: Oleg Drokin

Description

lctl debug_daemon userspace part would happily accept relative pathname, but in fact the kernel part of the code wold reject anything that does not start with a / as EINVAL which produces a cryptic error message to the user like

start debug_daemon on debug.log failed: Invalid argument

We should either require absolute pathname in the tool or at least print a warning that the relative pathnames are unsupported and the command will likely fail (leading to the actual failure that would be a lot less cryptic).