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With newer setuptools that is coming via !1550 (merged) (44.1.1 -> 67.8.0) we will need a fix from setuptools-dso 2.10 to handle python setup develop well:

Previously with setutools-dso 2.9 and setuptools 67.8.0 built shared libraries were not copied back into the working tree upon develop install which made anything using pygolang to fail as e.g.

$ ../bin/gpython
Traceback (most recent call last):
  File ".../../bin/gpython", line 20, in <module>
    sys.exit(gpython.main())
  File ".../pygolang/gpython/__init__.py", line 456, in main
    pymain(argv, init)
  File ".../pygolang/gpython/__init__.py", line 223, in pymain
    init()
  File ".../pygolang/gpython/__init__.py", line 447, in init
    import golang
  File ".../pygolang/golang/__init__.py", line 41, in <module>
    from golang._gopath import gimport  # make gimport available from golang
  File ".../pygolang/golang/_gopath.py", line 65, in <module>
    from golang import sync
  File ".../pygolang/golang/sync.py", line 36, in <module>
    from golang._sync import \
ImportError: liblibgolang.so.0.1: cannot open shared object file: No such file or directory

See https://github.com/mdavidsaver/setuptools_dso/pull/29#issuecomment-1745790761 and https://github.com/mdavidsaver/setuptools_dso/commit/2fdf75f2 for details.

P.S. NOTE that changing version of a setup-egg required egg currently does not force a rebuild. In other words pushing this change into testnodes won't make pygolang t o be rebuilt at all. I think this is simply a bug in slapos.buildout to fix.

/reported-by @xavier_thompson
/cc @jerome, @tomo, @kazuhiko