Disabling syslog debugging on open-fprintd

Posted: 2023-04-02 19:23:47 by Alasdair Keyes

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I recently installed python-validity (https://github.com/uunicorn/python-validity) and open-fprintd (https://github.com/uunicorn/open-fprintd) to get the fingerprint reader working on a Thinkpad T480s. (The standard fprintd package doesn't support the fingerprint reader device on the T480s).

After setting it up I noticed a lot of debug information in syslog (example truncated)...

Apr  2 09:11:00 hostname01 open-fprintd: >tls> 17: 4b00000b0053746757696e64736f7200
Apr  2 09:11:00 hostname01 open-fprintd: >cmd> 1703030050c00a...a82185cc9399d30625ee3c1451f
Apr  2 09:11:00 hostname01 open-fprintd: <cmd< 1703030050b7a4a...cdb0d7f97fa67b6337329
Apr  2 09:11:00 hostname01 open-fprintd: <tls< 17: 0000030002000b00000...6757696e64736f7200

To disable debug without changing the installed systemd files, run the following to create a custom open-fprintd.service file to override it.

sed 's/\(ExecStart.*\)\-\-debug\(.*\)/\1 \2/' /lib/systemd/system/open-fprintd.service > /etc/systemd/system/open-fprintd.service

After a reboot it'll stop spewing that data out.

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