[Nut-upsuser] NUT no longer works after 2.7 -> 2.8 upgrade

[Jim Klimov]

As recently noted in the lists, this was tracked
down to a Fedora 37 packaging bug: https://bugzilla.redhat.com/show_bug.cgi?
id=2127269

> The nut user does not have write permissions at /run.
Note that /run is linked as /var/run and the nut user DOES have write
permissions there.

These two statements do not fit together :) Permissions on symlink do not
matter, only the ultimate object's rights do (root-owned /run). The
packaging error is that (/var)/run/nut should have been used for drivers
and upsd, or /var/state/ups as it should also exist and be accessible to
these. For a quick fix you can set
Environment=NUT_ALTPIDPATH=/var/state/ups for their systemd units or
respective custom drop-in files.

Jim

On Tue, Nov 29, 2022, 14:06 Bill Gee <bgee at campercaver.net> wrote:

> Yesterday I upgraded one of my systems from Fedora 36 to Fedora 37.  NUT
> was upgraded to version 2.8.0.  It no longer runs.
>
> At first I thought it was because of the XFCE Power Manager program.
> That program finds the UPS with no problem.  I thought maybe the two
> programs were competing for the UPS port.  I shut down the XFCE power
> manager, but that did not help NUT.
>
> Based on the diagnostics given below, I think this is a permissions
> problem at /run.  The nut user does not have write permissions at /run.
> Note that /run is linked as /var/run and the nut user DOES have write
> permissions there.
>
> How can I correct this?
>
> =======================================
> [root at mythtv ups]# systemctl status nut-server
> nut-server.service - Network UPS Tools - power devices information server
>       Loaded: loaded (/usr/lib/systemd/system/nut-server.service;
> enabled; preset: disabled)
>       Active: active (running) since Tue 2022-11-29 06:18:13 CST; 19min ago
>     Main PID: 11908 (upsd)
>        Tasks: 1 (limit: 9482)
>       Memory: 736.0K
>          CPU: 27ms
>       CGroup: /system.slice/nut-server.service
>               └─11908 /usr/sbin/upsd -F
>
> Nov 29 06:18:13 mythtv.billgee.local upsd[11908]: Can't connect to UPS
> [cyberpower] (usbhid-ups-cyberpower): No such fi>
> Nov 29 06:18:13 mythtv.billgee.local nut-server[11908]: Can't connect to
> UPS [cyberpower] (usbhid-ups-cyberpower): No s>
> Nov 29 06:18:13 mythtv.billgee.local nut-server[11908]: Running as
> foreground process, not saving a PID file
> Nov 29 06:18:13 mythtv.billgee.local upsd[11908]: Running as foreground
> process, not saving a PID file
> Nov 29 06:23:13 mythtv.billgee.local nut-server[11908]: Can't connect to
> UPS [cyberpower] (usbhid-ups-cyberpower): No such file or directory>
> Nov 29 06:23:13 mythtv.billgee.local upsd[11908]: Can't connect to UPS
> [cyberpower] (usbhid-ups-cyberpower): No such file or directory>
>
> [root at mythtv ups]# usbhid-ups -a cyberpower
> Network UPS Tools - Generic HID driver 0.47 (2.8.0)
> USB communication driver (libusb 1.0) 0.43
> writepid: fopen /var/run/usbhid-ups-cyberpower.pid: Permission denied
> Using subdriver: CyberPower HID 0.6
> cps_adjust_battery_scale: battery readings will be scaled by 2/3
>
> Fatal error: unable to create listener socket
>
> bind /var/run/usbhid-ups-cyberpower failed: Permission denied
>
> Exiting.
>
> [root at mythtv ups]# ll /var/run/usb*
> ls: cannot access '/var/run/usb*': No such file or directory
>
> [root at mythtv ups]# ll -d /var/run
> lrwxrwxrwx. 1 root root 6 Aug 31  2014 /var/run -> ../run
>
> [root at mythtv ups]# ll -d /run
> drwxr-xr-x 55 root root 1500 Nov 28 08:22 /run
>
> [root at mythtv ups]# tail /etc/ups/ups.conf
> [cyberpower]
>          driver=usbhid-ups
>          desc="CyberPower CP1500"
>          port=auto
>          vendorid=0764
> ==================================================
>
>
> Thanks!
> --
> ===============
> Bill Gee
>
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>
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