Serial connections not working on some Linux distros due to /var/lock permissions

[pdcrom]

Opened this initially on the zwave binding github, but it appears this is part of the openhab-core?

When installing openhab 3.1.0 on linux based on Red Hat 8, I used Rocky Linux 8.4 and installed:

Installed Packages
openhab.noarch 3.1.0-1 @openhab-stable

the binding wants to write to /var/lock/ for the serial stick which is owned by root:root on these linux versions, so that fails and an error is shown in the journal:

Sep 03 17:13:06 openhab-dev karaf[769]: check_group_uucp(): error testing lock file creation Error details:Permission deniedcheck_lock_status: No permission to create lock file.

The paved road is for applications to write to a sub folder under /var/lock/ and include a drop-in /etc/tmpfiles.d to create that folder.

A workaround is discussed here: https://community.openhab.org/t/solved-oh3-zwave-binding-z-wave-serial-controller-aeotec-z-stick-gen5-remains-offline/108182/36

By copying the /usr/lib/tmpfiles.d/legacy.conf to /etc//tmpfiles.d/legacy.conf, and modifying the lines to :

d /run/lock 0755 root root -

to

d /run/lock 0775 root openhab -

and the binding is able to create the lock file and the zwave controller gets online:

[root@openhab-dev ~]# ll /var/lock/
total 4
-rw-r--r-- 1 root root 0 Sep 1 18:52 kdump
-rw-r--r-- 1 openhab openhab 11 Sep 3 17:01 LCK..ttyACM0
drwx------ 2 root root 40 Sep 1 18:52 lvm
drwxr-xr-x 2 root root 40 Sep 1 18:52 subsys

Regards,

Paul.

[wborn]

It's a nrjavaserial issue, so there is not really much to fix in openHAB except for upgrading the library to a version that fixes your issue.

See also: NeuronRobotics/nrjavaserial#60

[pdcrom]

Clear, I see it is open since 2016 :-)
Happy the work around also does the job.

[openhab-bot]

This issue has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/problem-with-setting-up-zooz-usb-z-wave-plus-s2-stick-zst10/134603/64

[openhab-bot]

This issue has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/no-serial-connection-with-smartmeter-binding-after-update-to-oh3/135469/7

[J-N-K]

Since this is not an openHAB bug, and proper documentation has been added, I'll close here.