[systemd-bugs] [Bug 87249] New: systemctl error messages contain no context

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87249

            Bug ID: 87249
           Summary: systemctl error messages contain no context
           Product: systemd
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: morten.hustveit at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

Observed behavior:

[bob at a00:~]$ sudo systemctl enable /foo/bar.service
Failed to execute operation: Invalid argument

Expected behvaior:

[bob at a00:~]$ sudo systemctl enable /foo/bar.service
Unable to create symbolic link /etc/systemd/system/bar.service: target already
exists

Details:

It seems that the systemd code generally passes error information as a single
numeric code, even across contexts where the caller cannot know what the error
code applies to.  This problem is further exacerbated by systemctl itself not
doing any work; attempting to run systemctl under strace will not reveal
additional context.

I would suggest making a per-thread error description string that takes
precedence over errno if set, maybe something like this:
https://gist.github.com/mortehu/df056c55958723b6836e

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