Mercurial > hgsubversion
view tests/run.py @ 1233:0d0132cba155
editor: fix edge case with in memory file-store size limit
There are a few cases where we will set a single file into to the
editor's FileStore object more than once. Notably, for copied and
then modified files, we will set it at least twice. Three times if
editing fails (which it can for symlinks).
If we pass the in-memory storage limit in between the first (or second
if editing fails) time we set the file and the last time we set the
file, we will write the data to the in memory store the first time and
the file store the last time. We didn't remove it form the in-memory
store though, and we always prefer reading from the in-memory store.
This means we can sometimes end up with the wrong version of a file.
This is fairly unlikely to happen in normal use since you need to hit
the memory limit between two writes to the store for the same file.
We only write a file multiple times if a) the file (and not one of
it's parent directories) is copied and then modified or b) editing
fails. From what I can tell, it's only common for editing to fail for
symlinks, and they ten to be relatively small data that is unlikely to
push over the limit. Finally, the default limit is 100MB which I
would expect to be most often either well over (source code) or well
under (binaries or automated changes) the size of the changes files in
a single commit.
The easiest way to reproduce this is to set the in-memory cache size
to 0 and then commit a copied and modified symlink. The empty-string
version from the failed editing will be the one that persists. I
happened to stumble upon this while trying (and failing) to test a
bug-fix for a related bug with identical symptoms (empty simlink). I
have seen this in the wild, once, but couldn't reproduce it at the
time. The repo in question is quite large and quite active, so I am
quite confident in my estimation that this is a real, but very rare,
problem.
The test changes attached to this was mneant to test a related bug,
but turned out not to actually cover the bug in question. They did
trigger this bug though, and are worthwhile to test, so I kept them.
author | David Schleimer <dschleimer@fb.com> |
---|---|
date | Mon, 07 Apr 2014 17:51:59 -0700 |
parents | 025de18d652b |
children | 4217a050a088 |
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#!/usr/bin/env python import optparse import os import sys import unittest import test_util test_util.SkipTest = None def tests(): import test_binaryfiles import test_diff import test_externals import test_fetch_branches import test_fetch_command import test_fetch_command_regexes import test_fetch_exec import test_fetch_mappings import test_fetch_renames import test_fetch_symlinks import test_fetch_truncated import test_hooks import test_svn_pre_commit_hooks import test_pull import test_pull_fallback import test_push_command import test_push_renames import test_push_dirs import test_push_eol import test_push_autoprops import test_single_dir_clone import test_single_dir_push import test_svnwrap import test_tags import test_template_keywords import test_utility_commands import test_unaffected_core import test_urls sys.path.append(os.path.dirname(__file__)) sys.path.append(os.path.join(os.path.dirname(__file__), 'comprehensive')) import test_rebuildmeta import test_stupid_pull import test_updatemeta import test_verify_and_startrev return locals() def comprehensive(mod): dir = os.path.basename(os.path.dirname(mod.__file__)) return dir == 'comprehensive' if __name__ == '__main__': description = ("This script runs the hgsubversion tests. If no tests are " "specified, all known tests are implied.") parser = optparse.OptionParser(usage="%prog [options] [TESTS ...]", description=description) parser.add_option("-A", "--all", dest="comprehensive", action="store_true", default=False, help="include slow, but comprehensive tests") parser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False, help="enable verbose output") parser.add_option("", "--no-demandimport", dest="demandimport", action="store_false", default=True, help="disable Mercurial demandimport loading") parser.add_option("", "--bindings", dest="bindings", action="store", default=None, choices=["swig", "subvertpy"], help="test using the specified bindings (swig or " "subvertpy)") parser.add_option("", "--show-stdout", dest="showstdout", action="store_true", default=False, help="show stdout (hidden by default)") (options, args) = parser.parse_args() if options.verbose: testargs = { 'descriptions': 3, 'verbosity': 2 } else: testargs = {'descriptions': 2} sys.path.append(os.path.dirname(os.path.dirname(__file__))) if options.demandimport: from mercurial import demandimport demandimport.enable() if options.bindings: os.environ['HGSUBVERSION_BINDINGS'] = options.bindings # make sure our copy of hgsubversion gets imported by loading test_util import test_util test_util.TestBase # silence output when running outside nose if not options.showstdout: import tempfile sys.stdout = tempfile.TemporaryFile() all_tests = tests() args = [i.split('.py')[0].replace('-', '_') for i in args] loader = unittest.TestLoader() suite = unittest.TestSuite() if not args: check = lambda x: options.comprehensive or not comprehensive(x) suite.addTests(loader.loadTestsFromModule(m) for (n, m) in sorted(all_tests.iteritems()) if check(m)) else: for arg in args: if arg == 'test_util': continue elif arg not in all_tests: print >> sys.stderr, 'test module %s not available' % arg else: suite.addTest(loader.loadTestsFromModule(all_tests[arg])) runner = unittest.TextTestRunner(**testargs) result = runner.run(suite) if not result.wasSuccessful(): sys.exit(1)