updated README

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Lukas Bulwahn 2013-01-02 10:09:13 +01:00
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README
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This is a layer to provide ROS in an openembedded linux system.
Currently, this layer is still under development and not fully functional.
AUTHOR
Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>
HOW TO CONTRIBUTE
We are still working on this development and are interested in other use cases.
If you are interested in this project, please contact us via email.
The more people are interested, the more we will be pushing this project.
If you want to contribute, please contact us and we can discuss open issues
and how we could join forces.
PURPOSE of this document:
This document describes
- the installation, use and content of the git repository meta_ros
- milestones, the open issues and how some issues have been resolved.
- license information and origin of redistributed files
INSTALLATION:
The repository only contains a layer for ros that builds on top of the existing openembedded core layer.
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RESOLVED ISSUES for M1:
- recipes for python-pyyaml and python-rospkg create invalid shell scripts (header line refers to python-native instead of python.)
RESOLVED by patching distutils class--has be committed to oe-core.
RESOLVED by patching distutils class--has been committed to oe-core.
- recipe for log4cxx requires another patch.
RESOLVED by providing patch 0003 in recipe
- Compilation with make fails in the virtual machine because of insufficient memory during compilation.
RESOLVED by increasing memory.
- rospkg modules are not found when runnning python.
RESOLVED by using the dist_utils argument to use traditional packaging mechanism and avoid .egg files at all (suggested by Ross Burton)
OPEN ISSUES for M1:
- python-setuptools requires some python-modules at run-time.
TEMPORARILY RESOLVED by adding all python-modules in the image
SHOULD BE RESOLVED by creating an appropriate patch for python-setuptools and contributing to openembedded-core
- rospkg modules are not found when runnning python.
TEMPORARILY RESOLVED by installing natively in the virtual machine
CAUSE of PROBLEM: must add /usr/lib/python2.7/site-packages/rospkg-1.0.15-py2.7.egg to PYTHON_PATH (sys.path)
In the usual setting, this is done by adding rospkg-1.0.15-py2.7.egg to the easy-install.pth
However, the distutils class removes the created easy-install.pth before packaging.
Modifying the class, to not remove the easy-install.pth does not solve the issue, because
also the python-setuptools must add an entry to easy-install.pth
This can be only solved by providing a general merge mechanism for the easy-install.pth file.
Implementing this should not be difficult because the format of this file is very easy, and
the pathes can be simply accumulated.
FIRST TEMPORARY SOLUTION: we simply write the easy-install.pth file in the rootfs task of the image generation.
SECOND SOLUTION: implemented behavior described above
THIRD SOLUTION: uses the dist_utils argument to use traditional packaging mechanism and avoid .egg files at all (suggested by Ross Burton)
OPEN ISSUES for M2:
- understand what rosinstall actually does