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776684c7b6
Previously, this was implemented using a horrible GDB script (because
there is no such thing as a non-horrible GDB script). This GDB script
often broke with newer versions of GDB for mysterious reasons. Port
the test script to GDB's Python API, which makes the code much cleaner
and, hopefully, more stable.
(cherry picked from commit cbbda62258)
Conflicts:
test/T380-atomicity.sh
71 lines
2.6 KiB
Python
71 lines
2.6 KiB
Python
# This gdb Python script runs notmuch new and simulates killing and
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# restarting notmuch new after every Xapian commit. To simulate this
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# more efficiently, this script runs notmuch new and, immediately
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# after every Xapian commit, it *pauses* the running notmuch new,
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# copies the entire database and maildir to a snapshot directory, and
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# executes a full notmuch new on that snapshot, comparing the final
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# results with the expected output. It can then resume the paused
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# notmuch new, which is still running on the original maildir, and
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# repeat this process.
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import gdb
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import os
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import glob
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import shutil
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import subprocess
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gdb.execute('set args new')
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# Make Xapian commit after every operation instead of batching
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gdb.execute('set environment XAPIAN_FLUSH_THRESHOLD = 1')
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maildir = os.environ['MAIL_DIR']
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# Trap calls to rename, which happens just before Xapian commits
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class RenameBreakpoint(gdb.Breakpoint):
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def __init__(self, *args, **kwargs):
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super(RenameBreakpoint, self).__init__(*args, **kwargs)
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self.last_inodes = {}
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self.n = 0
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def stop(self):
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# As an optimization, only consider snapshots after a Xapian
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# has really committed. Xapian overwrites record.base? as the
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# last step in the commit, so keep an eye on their inumbers.
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inodes = {}
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for path in glob.glob('%s/.notmuch/xapian/record.base*' % maildir):
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inodes[path] = os.stat(path).st_ino
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if inodes == self.last_inodes:
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# Continue
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return False
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self.last_inodes = inodes
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# Save a backtrace in case the test does fail
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backtrace = gdb.execute('backtrace', to_string=True)
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open('backtrace.%d' % self.n, 'w').write(backtrace)
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# Snapshot the database
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shutil.rmtree('%s.snap/.notmuch' % maildir)
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shutil.copytree('%s/.notmuch' % maildir, '%s.snap/.notmuch' % maildir)
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# Restore the mtime of $MAIL_DIR.snap/
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shutil.copystat('%s/.notmuch' % maildir, '%s.snap/.notmuch' % maildir)
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# Run notmuch new to completion on the snapshot
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env = os.environ.copy()
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env.update(NOTMUCH_CONFIG=os.environ['NOTMUCH_CONFIG'] + '.snap',
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XAPIAN_FLUSH_THRESHOLD='1000')
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subprocess.check_call(
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['notmuch', 'new'], env=env, stdout=open('/dev/null', 'w'))
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subprocess.check_call(
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['notmuch', 'search', '*'], env=env,
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stdout=open('search.%d' % self.n, 'w'))
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# Tell the shell how far we've gotten
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open('outcount', 'w').write(str(self.n + 1))
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# Continue
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self.n += 1
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return False
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RenameBreakpoint('rename')
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gdb.execute('run')
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