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Location: kallithea/scripts/generate-ini.py - annotation

domruf
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.
#!/usr/bin/env python2
"""
Based on kallithea/lib/paster_commands/template.ini.mako, generate
  development.ini
  kallithea/tests/test.ini
"""

import re

from kallithea.lib import inifile

# files to be generated from the mako template
ini_files = [
    ('development.ini',
        {
            '[server:main]': {
                'host': '0.0.0.0',
            },
            '[app:main]': {
                'initial_repo_scan': 'true',
                'debug': 'true',
                'app_instance_uuid': 'development-not-secret',
                'beaker.session.secret': 'development-not-secret',
            },
            '[handler_console]': {
                'formatter': 'color_formatter',
            },
            '[handler_console_sql]': {
                'formatter': 'color_formatter_sql',
            },
        },
    ),
]


def main():
    # make sure all mako lines starting with '#' (the '##' comments) are marked up as <text>
    makofile = inifile.template_file
    print 'reading:', makofile
    mako_org = open(makofile).read()
    mako_no_text_markup = re.sub(r'</?%text>', '', mako_org)
    mako_marked_up = re.sub(r'\n(##.*)', r'\n<%text>\1</%text>', mako_no_text_markup, flags=re.MULTILINE)
    if mako_marked_up != mako_org:
        print 'writing:', makofile
        open(makofile, 'w').write(mako_marked_up)

    # create ini files
    for fn, settings in ini_files:
        print 'updating:', fn
        inifile.create(fn, None, settings)


if __name__ == '__main__':
    main()