[Bug 1861556] Re: g-ir-scanner doesn't work

[Mario Limonciello]

It appears to me to be happening because gobject-introspection only
ships a python file for python3.8 not python3.7 which is the default in
focal.

$ python3.7 /usr/bin/g-ir-scanner
Traceback (most recent call last):
  File "/usr/bin/g-ir-scanner", line 99, in <module>
    from giscanner.scannermain import scanner_main
  File "/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/scannermain.py", line 35, in <module>
    from giscanner.ast import Include, Namespace
  File "/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/ast.py", line 29, in <module>
    from .sourcescanner import CTYPE_TYPEDEF, CSYMBOL_TYPE_TYPEDEF
  File "/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/sourcescanner.py", line 33, in <module>
    from giscanner._giscanner import SourceScanner as CSourceScanner
ModuleNotFoundError: No module named 'giscanner._giscanner'

$ python3.8 /usr/bin/g-ir-scanner
ERROR: Need at least one filename

$ ls -alh /usr/bin/python3
lrwxrwxrwx 1 root root 9 Oct 18 10:23 /usr/bin/python3 -> python3.7


** Also affects: python3-defaults (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1861556

Title:
  g-ir-scanner doesn't work

Status in gobject-introspection package in Ubuntu:
  New
Status in python3-defaults package in Ubuntu:
  New

Bug description:
  Running g-ir-scanner doesn't work anymore after a recent upgrade with
  a fully up to date focal:

  Traceback (most recent call last):
    File "/usr/bin/g-ir-scanner", line 99, in <module>
      from giscanner.scannermain import scanner_main
    File "/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/scannermain.py", line 35, in <module>
      from giscanner.ast import Include, Namespace
    File "/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/ast.py", line 29, in <module>
      from .sourcescanner import CTYPE_TYPEDEF, CSYMBOL_TYPE_TYPEDEF
    File "/usr/lib/x86_64-linux-gnu/gobject-introspection/giscanner/sourcescanner.py", line 33, in <module>
      from giscanner._giscanner import SourceScanner as CSourceScanner
  ModuleNotFoundError: No module named 'giscanner._giscanner'

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gobject-introspection 1.62.0-4ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
  Uname: Linux 5.4.0-12-generic x86_64
  ApportVersion: 2.20.11-0ubuntu16
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Feb  1 07:04:11 2020
  InstallationDate: Installed on 2019-08-13 (171 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190712)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gobject-introspection
  UpgradeStatus: Upgraded to focal on 2019-11-04 (89 days ago)

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