error on command : sudo setcap CAP_NET_BIND_SERVICE+eip /home/pi/.pyenv/versions/3.9.2/bin/python3.9

[Luigi Vogliobene]

Hi,

trying to install picochess on a Debian 13.2 amd64 laptop I got, for the subject command, the error:

ERROR  picochess - main: Could not start webserver - port 80 not allowed by operating system

I am not able to get the webserver working.

Please help me to solve this problem.

Thank you.

Luigi

[Randy Reade]

Is pi the actual user account on your laptop? That command looks like you are building a v3.4 version.

Randy

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[Luigi Vogliobene]

Yes, user account pi password picochess.

On a fresh installed Debian 13.2 I tried to :

1. sudo git clone https://github.com/JohanSjoblom/picochess.git  (from Johan 4.1.9 github picochess environment)

2. sudo ./install-picochess.sh

All was OK but after the reboot I got the above error  and the webserver do not work.

Luigi

[Randy Reade]

Strange. V4 doesn't use pyenv. Did you try to install v3 previously? It looks like the install is corrupted somehow.

You can rename /opt/picochess or delete it then install v4 using the wget command way:

https://github.com/JohanSjoblom/picochess#quick-installation

[Luigi Vogliobene]

Hi Randy,

I follow your hints but I got the same problem.

I attached the picochess.log file that shows the problem.

Thank you.

Luigi

[RandyR]

Ok. Try this command:

sudo setcap 'cap_sys_boot,cap_net_bind_service,cap_sys_rawio,cap_dac_override+eip' $(readlink -f "/opt/picochess/venv/bin/python")

[Luigi Vogliobene]

Thank you so much, Randy, now the webserver works.

Luigi

[RandyR]

Maybe you don't need to apply all those capabilities on your laptop, just cap-net_bind_service. The other ones are mainly for the DGTPi. You might want to remove them and just go with the one given in the log. To do this you would enter 2 commands:

sudo setcap 'cap_sys_boot,cap_net_bind_service,cap_sys_rawio,cap_dac_override-eip' $(readlink -f "/opt/picochess/venv/bin/python")

sudo setcap 'cap_net_bind_service=+ep' $(readlink -f $(which python3))

[Luigi Vogliobene]

Done! it does work.

Thank you again, Randy.

Luigi

[Johan Sjöblom]

I will try to make the install script more Linux aware so that it runs the setcaps differently on aarch64 and x86_64... Thanks for the testing, I can use the information from this discusson to do that.

[Johan Sjöblom]

install-picochess script now has different setcap handling for aarch64 (Pi) and x86_64 (Linux). The Pi part is unchanged, and in the Linux part I followed the learnings from above... This way the next brave installer should not get a problem to run port 80.

[Luigi Vogliobene]

Thank you Johan