Trunk servers built from source try to launch with Python 3

[J. Max Mena]

Building a trunk machine from source causes /usr/bin/xpra to start with the line:

#!/usr/bin/python3

And, when a user tries to launch a server, it says that operation is not supported.

For some odd reasons, the trunk build scripts (the ones that Smo helped me set up) spit out that line, which caused almost two days worth of a headache for me until Smo spotted it. I thought this was an issue with just my machines until someone else had it happen to them on a completely fresh machine, so I figured it would be best to report this as an issue.

Here's the shell script I'm building with (ran in the src/ folder):

#clean up build info
rm xpra/build_info.py
rm xpra/src_info.py

#clean up old build
./setup.py clean

#LDFLAGS=-Wl,-rpath=/usr/lib64/xpra \
#PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/lib64/xpra/pkgconfig \
#    ./setup.py install
#no longer needed
python2 ./setup.py build \
    --rpath=/usr/lib64/xpra --pkg-config-path=/usr/lib64/xpra/pkgconfig
    
sudo python3 ./setup.py install \
    --rpath=/usr/lib64/xpra --pkg-config-path=/usr/lib64/xpra/pkgconfig
    --without-html5 --without-printing
sudo python2 ./setup.py install \
    --rpath=/usr/lib64/xpra --pkg-config-path=/usr/lib64/xpra/pkgconfig

[J. Max Mena]

Oh, I should mention that changing the python3 to python2 allows the trunk servers to launch and run as expected.

[Antoine Martin]

Just run the python2 build last, or delete "/usr/bin/xpra" before you run it.

This is not new, both builds claim the same file.

[Antoine Martin]

Note: there is a workaround for this, you can run:

python2 /usr/bin/xpra (...) --systemd-run=no

[J. Max Mena]

Running Python2 before Python3 doesn't change anything, but leaving the Python3 one first and deleting /usr/bin/xpra before running the Python2 one did it.

Note: The wiki page on building from source didn't mention this and needs to be updated. Especially considering all the build system changes that 2.X brings.

[Antoine Martin]

• you do not need to delete the file, whatever you run last will be what sticks (edited comment:2 which said "first" instead of "last")
• there are no "build system changes" in 2.x relating to this AFAIK - the "systemd-run" option which makes this more apparent was already in 1.0

Feel free to edit the wiki, I don't see what needs adding.

[J. Max Mena]

Okay, I see now.

Weird that it didn't fix it, but it's working for now so I don't really want to poke it, lest I make it worse.

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/1439