[Bug 1920567] [NEW] virtual packages are not provided

[Arnold Czémán]

Public bug reported:

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.

** Affects: ply (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1920567

Title:
  virtual packages are not provided

Status in ply package in Ubuntu:
  New

Bug description:
  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.

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