debugrebuildfncache: add a cheaper option to rebuild the fncache
On my repository, debugrebuildfncache takes 5-10min with the lock.
With the flag added in this commit, it takes 10s. The tradeoff is that
it only recovers from certain kinds of corruptions. It is intended to
to recover faster from fncaches broken by a revlog split during a
transaction that ends up being rolled back.
Differential Revision: https://phab.mercurial-scm.org/D11265
from __future__ import absolute_import
import __builtin__
import os
from mercurial import util
def lowerwrap(scope, funcname):
f = getattr(scope, funcname)
def wrap(fname, *args, **kwargs):
d, base = os.path.split(fname)
try:
files = os.listdir(d or '.')
except OSError:
files = []
if base in files:
return f(fname, *args, **kwargs)
for fn in files:
if fn.lower() == base.lower():
return f(os.path.join(d, fn), *args, **kwargs)
return f(fname, *args, **kwargs)
scope.__dict__[funcname] = wrap
def normcase(path):
return path.lower()
os.path.normcase = normcase
for f in 'file open'.split():
lowerwrap(__builtin__, f)
for f in "chmod chown open lstat stat remove unlink".split():
lowerwrap(os, f)
for f in "exists lexists".split():
lowerwrap(os.path, f)
lowerwrap(util, 'posixfile')