** Changed in: nut (Debian)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1540008
Title:
USB permissions not set at install time (udevd name changed?)
Status in nut package in Ubuntu:
Fix Released
Status in nut source package in Trusty:
Fix Released
Status in nut source package in Xenial:
Fix Released
Status in nut source package in Yakkety:
Won't Fix
Status in nut source package in Zesty:
Fix Released
Status in nut package in Debian:
Fix Released
Bug description:
[Impact]
* Installing nut provides rules to set up the devnodes accordingly, but
on an install the trigger to run those is missed to be executed due to
an error in postinst.
* Fix is a backport from Debian repo
(https://anonscm.debian.org/cgit/collab-maint/nut.git/commit/id=d31c6dcb)
, which works in artful already
[Test Case]
* Plug in a usb controlled UPS of your choice
* Install nut-server
* The device node created should be mode 664 and group "nut", but it is
not.
* Install the proposed package with the fix
* that should trigger the rules to run and it should now be created with
proper permissions.
* In the lack of special HW there is a fallback
* Create a VM and give it some USB device
* Start in one console "sudo udevadm monitor"
* On installing the nut-server package the USB events should be
re-triggered, but they are not yet today - with the fixed package they are.
[Regression Potential]
* The postinst trigger never worked, now it will work. If on a system the
rules fail to execute there might be an issue, but since the are only
triggered (async udev) the install will not fail due to that. I think
in the worst case they are just still not executed.
* Vice versa once they are executed correctly the changed permission
could be an issue for odd setups that relied on the broken permission,
but I explained in the Regression potential section of bug 1099947 that
is released together why I think that is no issue.
[Other Info]
* n/a
----
1) $ lsb_release -rd
Description: Ubuntu 14.04.3 LTS
Release: 14.04
2) nut-server: 2.7.1-1ubuntu1; udev: 204-5ubuntu20.15
3) On a fresh install of Ubuntu 14.04 (amd64), I installed the nut-
server package while the UPS was already connected via USB. After
installation, the permissions described by /lib/udev/rules.d/52-nut-
usbups.rules should have changed the group of the corresponding
/dev/bus/usb/*/* node to 'nut'.
4) The owner/group for the /dev/bus/usb node remained root:root.
Manually running 'udevadm trigger --subsystem-match=usb
--action=change' changed the group to 'nut'. (From past experience
tracking down related udev+nut bugs, unplugging and re-plugging the
USB cable would yield similar results.)
However, that udevadm command is included in the postinst for nut-
server, and it is guarded with a pidof check for 'udevd':
# ask udev to check for new udev rules
[ -x /etc/init.d/udev ] && pidof udevd > /dev/null \
&& udevadm trigger --subsystem-match=usb --action=change
This most likely needs to be amended to include the current process
name, 'systemd-udevd'. I checked the control files, and unless the
udevd process name has changed back, I believe this will affect vivid,
wily and xenial as well as trusty. (I will let someone else add those
later tags if that turns out to be the case.)
To manage notifications about this bug go to:
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