With 2.7 dropped, use shutil disk_usage function universally.

[rtibbles]

Summary

Removes platform specific behaviour.
Uses shutil disk_usage which has support on Unix systems and Windows.
This may well break Android, as it removes the Android specific code, but this will be rectified in the Android installer with this issue: learningequality/kolibri-installer-android#211

References

Fixes the Kolibri side of learningequality/kolibri-installer-android#211

Reviewer guidance

Windows and Unix systems should show free space appropriately for content imports.

Opening as a draft to first confirm the impact on the Android installer.

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Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
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• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-.pex
Windows Installer (EXE)	kolibri-0.16.2b2.dev0+git.1147.gc196a628-windows-setup-unsigned.exe
Debian Package	kolibri_0.16.2b2.dev0+git.1147.gc196a628-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.2b2.dev0+git.1147.gc196a628-0.4.2.dmg
Android Package (APK)	kolibri-0.16.2b2.dev0+git.1147.gc196a628-0.1.3-debug.apk
TAR file	kolibri-0.16.2b2.dev0+git.1147.gc196a628.tar.gz
WHL file	kolibri-0.16.2b2.dev0+git.1147.gc196a628-py2.py3-none-any.whl

[pcenov]

Hi @rtibbles - the app force closes immediately after launch on all of my devices. Here are the logs, db and logcat from Android studio:

logs-logcat.zip

[rtibbles]

I guess that takes the uncertainty out of this!

This may well break Android

[rtibbles]

Looking at the logs, this is the same error you saw on my PR: #11974 - and doesn't seem to be directly related to this PR at all.

[rtibbles]

I will come back to this PR when the other one has been merged.

[jredrejo]

loving when a pr mostly removes code. It's pretty clear (as far as we're using at least python 3.3, which will be the case in develop)

[radinamatic]

This might need a rebase, since #11974 has been merged... 🤔
(tested the APK today, the initial app force close after launch is still extant)

[rtibbles]

Have rebased on latest develop, so hopefully any errors should be purely its own!

[radinamatic]

Comment	Screenshhot
This latest APK installs and goes through the setup wizard without issues 🙂 Any specific reviewer guidance for this PR?

[rtibbles]

The only possible source of breakage would be the free space being misreported during resource import.