[Bug 1960263] Re: python-pil-doc fails to build in jammy

[Heinrich Schuchardt]

This seems to be the culprint. The string '3.10' does not fit into 3 characters:
PY3VER   := $(shell python3 -c 'import sys; print(sys.version[:3])')

ls /<<PKGBUILDDIR>>/build/ -la
total 16
drwxrwxr-x  4 root root 4096 Feb 15 11:37 .
drwxr-xr-x 10 root root 4096 Feb 15 11:38 ..
drwxrwxr-x  3 root root 4096 Feb 15 11:37 lib.linux-x86_64-3.10
drwxrwxr-x  3 root root 4096 Feb 15 11:37 temp.linux-x86_64-3.10
echo PY3VER: '3.1'
PY3VER: 3.1
echo PY3VERS: '3.10'
PY3VERS: 3.10

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https://bugs.launchpad.net/bugs/1960263

Title:
  python-pil-doc fails to build in jammy

Status in pillow package in Ubuntu:
  New
Status in pillow source package in Jammy:
  New

Bug description:
  Full build logs
  ---------------
  https://launchpad.net/ubuntu/+source/pillow/9.0.0-1build1

  Build log excerpt
  -----------------
  dh_installdocs -ppython-pil-doc docs/_build/html
  dh_installdocs: warning: Cannot auto-detect main package for python-pil-doc.  If the default is wrong, please use --doc-main-package
  cp: cannot stat 'docs/_build/html': No such file or directory
  dh_installdocs: error: cp --reflink=auto -a docs/_build/html debian/python-pil-doc/usr/share/doc/python-pil-doc returned exit code 1

  Shorter build log excerpt
  -------------------------
  cp: cannot stat 'docs/_build/html': No such file or directory

  Discussion
  ----------
  I think this build failure was triggered because Ubuntu currently has both python 3.9 and 3.10 as supported versions.

  This bug is currently blocking the completion of this transition.
  https://people.canonical.com/~ubuntu-archive/transitions/html/auto-libwebp.html

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