[systemd-bugs] [Bug 88491] New: in initrd, systemd-udevd logs errors "specified group '{tty, uucp, ...}' unknown"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88491

            Bug ID: 88491
           Summary: in initrd, systemd-udevd logs errors "specified group
                    '{tty,uucp,...}' unknown"
           Product: systemd
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: a.c.kalker at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

Using Arch Linux x86_64, mkinitcpio `systemd` hook changed to not install
/etc/{passwd,group} and some supporting files into initrd, systemd-udevd logs
the following errors (priority=3) to journal on boot:

$ journalctl -b -p3
-- Logs begin at Fri 2015-01-16 11:20:13 UTC, end at Fri 2015-01-16 11:20:20
UTC
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'tty' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'uucp' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'kmem' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'input' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'video' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'audio' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'lp' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'disk' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'optical' unknown
Jan 16 11:20:13 localhost systemd-udevd[49]: specified group 'storage' unknown

Related CoreOS issue: Normal boot on a vagrant vbox machine produces 26
critical[sic] error entries in journal · Issue #70 · coreos/bugs :
https://github.com/coreos/bugs/issues/70

`man systemd-udevd` shows that it supports the `--resolve-names` option, which
I suppose is meant to deal with situations like this.
>From some digging, I found the following commit in systemd Git:

---[cut here]---
commit 5f03ed8a56d308af72db8a48ab66ed68667af2c6
Author: Scott James Remnant <scott at ubuntu.com>
Date:   Tue Jan 20 21:33:02 2009 +0000

    Allow user and group lookup to be disabled.

    In certain cut-down situations such as an installer or inside the
    initramfs, we simply don't have any kind of name service.  While we
    could use rules without OWNER or GROUP, it's better to have the same
    rules as a full system and have udevd ignore those parts of the rules.

    Adds a --resolve-names=never switch to udevd that has this effect.
---[cut here]---

This appears to confirm my assumption.

This option doesn't appear to be used in any of the units shipped with systemd,
perhaps it is an idea to create a variant of `systemd-udevd.service` (perhaps
named `systemd-udevd-initrd.service`) with this particular setting for use in
the initrd.

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