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Bug 1446934

Summary: Failure to import Box2D in Sugar Physics
Product: [Fedora] Fedora Reporter: Frederick Grose <fgrose>
Component: sugar-physicsAssignee: Peter Robinson <pbrobinson>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 26CC: awilliam, callkalpa, cstratak, martin, pbrobinson, sebastian
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard: AcceptedFreezeException
Fixed In Version: sugar-physics-32.1-3.fc27 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-11-08 22:09:57 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On:    
Bug Blocks: 1396705    

Description Frederick Grose 2017-04-30 17:32:07 UTC
Description of problem:
Physics-26 & 31 fail to start

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.Boot Sugar on a Stick 26 alpha
2.Try to launch Physics-26

Actual results:Failed to start

Expected results:Start

Additional info:

See (includes logs).

Comment 1 Peter Robinson 2017-08-01 22:50:56 UTC
Charalampos updated pybox2d so I suspect something has happened on the move to 2.3.2

Comment 2 Frederick Grose 2017-08-02 10:00:04 UTC
Here is the traceback from Fedora Spin SoaS 26 packaged with Physics 32.1:

Traceback (most recent call last):
  File "/usr/bin/sugar-activity", line 220, in <module>
  File "/usr/bin/sugar-activity", line 164, in main
    module = __import__(module_name)
  File "/usr/share/sugar/activities/Physics.activity/", line 62, in <module>
    import tools
  File "/usr/share/sugar/activities/Physics.activity/", line 35, in <module>
    import lib.Box2D as box2d
ImportError: No module named lib.Box2D
Exited with status 1, pid 1951 data (<open file '<fdopen>', mode 'w' at 0x7f3c9451cdb0>, 'aee31508626e498542ffca08474e032c0d530bf0')

Comment 3 Charalampos Stratakis 2017-10-05 14:29:49 UTC
Apologies for not getting to it sooner, there is way too much stuff on my backlog. I might be able to get to it, in hopefully two weeks time.

Comment 4 Charalampos Stratakis 2017-10-17 14:29:26 UTC
The issue here is not related to pybox2d rebase but to the way that sugar-physics handles the box2d import.

More specifically, sugar-physics bundles Box2D [0], adds the directory to the path and then imports it from that directory.

This started happening since v30 of physics  for and [1] and v32 for where the failure was noticed [2].

The fedora package of sugar-physics though, removes that directory so that import is not valid anymore. In order to use the system package the import has to be changed back:

-import lib.Box2D as box2d
+import Box2D as box2d

However I am unclear on how this might affect Physics as a bundle, if at all. A small discussion about it at [3].

Also I tried to get the traceback on Fedora SoaS spin but I wasn't able to capture it, however when I changed the code inside a running spin, I was able to start physics normally.


Comment 5 Charalampos Stratakis 2017-10-17 14:49:14 UTC
Also it seems that even by doing that, the version of Box2D that is bundled with pybox2d will be used by sugar physics, as pybox2d places it in usr/lib64/python2.7/site-packages.

That should be resolved with the resolution of bug 844091.

Comment 6 Charalampos Stratakis 2017-10-17 15:41:55 UTC
Sent a PR at

Comment 7 Fedora Update System 2017-10-17 17:00:32 UTC
sugar-physics-32.1-3.fc27 has been submitted as an update to Fedora 27.

Comment 8 Fedora Update System 2017-10-18 17:21:37 UTC
sugar-physics-32.1-3.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See for
instructions on how to install test updates.
You can provide feedback for this update here:

Comment 9 Fedora Blocker Bugs Application 2017-11-03 11:12:01 UTC
Proposed as a Freeze Exception for 27-final by Fedora user pbrobinson using the blocker tracking app because:

 Fixes the Physics app which currently crashes.

Comment 10 Adam Williamson 2017-11-03 20:47:49 UTC
Discussed at 2017-11-01 to 2017-11-02 Fedora 27 Go/No-Go meeting, acting as a freeze exception review meeting: . Accepted as a freeze exception: this would be a blocking issue on a release-blocking desktop spin (included app does not work), which creates a strong presumption in favour of FE status. The fix is clearly limited - it cannot affect anything outside of Sugar. Thus it seems clearly desirable to pull it in and fix the app for the Sugar live image.

Comment 11 Fedora Update System 2017-11-08 22:09:57 UTC
sugar-physics-32.1-3.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.