Mercurial > hg
view contrib/check-config.py @ 27430:e240e914d226 stable
revlog: seek to end of file before writing (issue4943)
Revlogs were recently refactored to open file handles in "a+" and use a
persistent file handle for reading and writing. This drastically
reduced the number of file handles being opened.
Unfortunately, it appears that some versions of Solaris lose the file
offset when performing a write after the handle has been seeked.
The simplest workaround is to seek to EOF on files opened in a+ mode
before writing to them, which is what this patch does.
Ideally, this code would exist in the vfs layer. However, this would
require creating a proxy class for file objects in order to provide a
custom implementation of write(). This would add overhead. Since
revlogs are the only files we open in a+ mode, the one-off workaround
in revlog.py should be sufficient.
This patch appears to have little to no impact on performance on my
Linux machine.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Thu, 17 Dec 2015 17:16:02 -0800 |
parents | d1cb185b9ee2 |
children | 9c98fe1416c2 |
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#!/usr/bin/env python # # check-config - a config flag documentation checker for Mercurial # # Copyright 2015 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import re import sys foundopts = {} documented = {} configre = (r"""ui\.config(|int|bool|list)\(['"](\S+)['"], ?""" r"""['"](\S+)['"](,\s(?:default=)?(\S+?))?\)""") def main(args): for f in args: sect = '' prevname = '' confsect = '' for l in open(f): # check topic-like bits m = re.match('\s*``(\S+)``', l) if m: prevname = m.group(1) if re.match('^\s*-+$', l): sect = prevname prevname = '' if sect and prevname: name = sect + '.' + prevname documented[name] = 1 # check docstring bits m = re.match(r'^\s+\[(\S+)\]', l) if m: confsect = m.group(1) continue m = re.match(r'^\s+(?:#\s*)?([a-z._]+) = ', l) if m: name = confsect + '.' + m.group(1) documented[name] = 1 # like the bugzilla extension m = re.match(r'^\s*([a-z]+\.[a-z]+)$', l) if m: documented[m.group(1)] = 1 # quoted in help or docstrings m = re.match(r'.*?``([-a-z_]+\.[-a-z_]+)``', l) if m: documented[m.group(1)] = 1 # look for ignore markers m = re.search(r'# (?:internal|experimental|deprecated|developer)' ' config: (\S+.\S+)$', l) if m: documented[m.group(1)] = 1 # look for code-like bits m = re.search(configre, l) if m: ctype = m.group(1) if not ctype: ctype = 'str' name = m.group(2) + "." + m.group(3) default = m.group(5) if default in (None, 'False', 'None', '0', '[]', '""', "''"): default = '' if re.match('[a-z.]+$', default): default = '<variable>' if name in foundopts and (ctype, default) != foundopts[name]: print l print "conflict on %s: %r != %r" % (name, (ctype, default), foundopts[name]) foundopts[name] = (ctype, default) for name in sorted(foundopts): if name not in documented: if not (name.startswith("devel.") or name.startswith("experimental.") or name.startswith("debug.")): ctype, default = foundopts[name] if default: default = ' [%s]' % default print "undocumented: %s (%s)%s" % (name, ctype, default) if __name__ == "__main__": sys.exit(main(sys.argv[1:]))