Comment 0 for bug 1920567

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Arnold Czémán (cemiarni) wrote : virtual packages are not provided

Version: 3.11-3build1
Ubuntu release: 20.04

The python3-ply binary package should provide these virtual packages: python3-ply-lex-3.10, python3-ply-yacc-3.10, but it cannot provide them after a build in a fresh focal docker container.

This is because the provided virtual package names are generated by the 'debian/virtual-packages.py' script, which uses a shebang with '/usr/bin/python'. By default there is no 'python' binary on ubuntu focal.

One solution could be adding the 'python-is-python2' package as a build dependency. I have used this temporarily.

Or the shebang could be more specific: '/usr/bin/python2' or '/usr/bin/env python2'.

Or the script could be ported to python3 with a proper specific shebang.

It would also be useful to raise a build error, when the script fails.