revlog: add a _datareadfp context manager for data access needs
The helper handles:
1) is there a file handle already open that we shall just reuse,
2) is the revlog inlined or not.
Using a context manager for all read access will help setting up file pointer
caching in later changesets.
from __future__ import absolute_import
from mercurial import (
util,
)
# XXX: we should probably offer a devel option to do this in blackbox directly
def getuser():
return 'bob'
def getpid():
return 5000
# mock the date and user apis so the output is always the same
def uisetup(ui):
util.getuser = getuser
util.getpid = getpid