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vcs: catch MemoryErrors when calling Git diff
Binary diffs can make the diffs VERY big and cause MemoryError exceptions.
Before giving MemoryError, the system might start swapping, any process might
fail when allocating memory, random processes might get killed, and our process
might fail in other places. The proper fix would be to avoid the problem by not
trying to process more data than we can handle - for example by not processing
more than a certain amount of Git output.
Before, memory errors were shown to the user as a 500 Internal Server Error
page.
Now, as long as we have no better/safer way get the diff, catch the MemoryError
and show the page with a flash error message and no diff.
The error handling is placed in the diffs module to avoid leaking flash
messages into the vcs lib.
Binary diffs can make the diffs VERY big and cause MemoryError exceptions.
Before giving MemoryError, the system might start swapping, any process might
fail when allocating memory, random processes might get killed, and our process
might fail in other places. The proper fix would be to avoid the problem by not
trying to process more data than we can handle - for example by not processing
more than a certain amount of Git output.
Before, memory errors were shown to the user as a 500 Internal Server Error
page.
Now, as long as we have no better/safer way get the diff, catch the MemoryError
and show the page with a flash error message and no diff.
The error handling is placed in the diffs module to avoid leaking flash
messages into the vcs lib.
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=============
Customization
=============
There are several ways to customize Kallithea to your needs depending on what
you want to achieve.
HTML/JavaScript/CSS customization
---------------------------------
To customize the look-and-feel of the web interface (for example to add a
company banner or some JavaScript widget or to tweak the CSS style definitions)
you can enter HTML code (possibly with JavaScript and/or CSS) directly via the
*Admin > Settings > Global > HTML/JavaScript customization
block*.
Behavioral customization: rcextensions
--------------------------------------
Some behavioral customization can be done in Python using ``rcextensions``, a
custom Python package that can extend Kallithea functionality.
With ``rcextensions`` it's possible to add additional mappings for Whoosh
indexing and statistics, to add additional code into the push/pull/create/delete
repository hooks (for example to send signals to build bots such as Jenkins) and
even to monkey-patch certain parts of the Kallithea source code (for example
overwrite an entire function, change a global variable, ...).
To generate a skeleton extensions package, run::
gearbox make-rcext -c my.ini
This will create an ``rcextensions`` package next to the specified ``ini`` file.
See the ``__init__.py`` file inside the generated ``rcextensions`` package
for more details.
Behavioral customization: code changes
--------------------------------------
As Kallithea is open-source software, you can make any changes you like directly
in the source code.
We encourage you to send generic improvements back to the
community so that Kallithea can become better. See :ref:`contributing` for more
details.
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