id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
13590	was 'Jinja2 python2 ends in error', now 'QtWebEngine does not need Jinja2'.	ken@…	ken@…	"Not sure if this happens all the time, or mostly, or only randomly.

I initially reported this in [http://lists.linuxfromscratch.org/pipermail/blfs-support/2020-May/082000.html] but at that time a subsequent DESTDIR install appeared to work without problems.

A day or so ago, I hit the same problem on a fresh system.

Note that Jinja-2.11.2 is the last version that will support Python2, so trying to debug it seems like a waste of time when there is a workaround.

What seems to happen is that after Jinja has been installed for 2.7, easy_install looks at the runtime dependencies and decides that MarkupSafe is needed.  With 2.11.1 I think it didn't install that for 2.7, but now - at least when the problem occurs - it tries to install the current version and that does not supprot python2.

The workaround is to add ' || true' to the install (and to manually check that files in /usr/lib/python2.7/site-packages/Jinja2-2.11.2-py2.7.egg/jinja2/ have been installed).

I'm proposing to include the workaround in the hope that jhalfs will not fail in this case.

For explanatory text:

Sometimes the python2 install tries to install the current version of MarkupSafe, and fails. As long as the files in /usr/lib/python2.7/site-packages/Jinja2-2.11.2-py2.7.egg/jinja2 have 
been installed, the install will be adequate for QtWebengine.

With a command explanation along the lines of ""... || true"" : do not return an error status when the install apparently fails (to allow scripted installs).

I'll note that the source has the following references to MarkupSafe:

./setup.py:    install_requires=[""MarkupSafe>=0.23""],
./docs/templates.rst:`MarkupSafe.Markup` strings with an ``__html__`` attribute.
./docs/intro.rst:MarkupSafe Dependency
./docs/intro.rst:As of version 2.7 Jinja depends on the `MarkupSafe`_ module. If you install
./docs/intro.rst:.. _MarkupSafe: https://markupsafe.palletsprojects.com/
./CHANGES.rst:-   Depend on MarkupSafe 0.23 or higher.

Also, I had the exact same problem when I first hit this and tried reverting to 2.11.1.  Hmm, I had thought that MarkupSafe was unnecessary, but I see that in BLFS-9.1 it managed to install 1.1.1 for 2.7.  Whatever, qtwebengine doesn't need it. Perhaps Python-2.7.18 broke something."	defect	closed	normal	10.0	BOOK	SVN	medium	fixed