checknlink: return False if .hgtmp file preexists (issue2517)
If os_link fails on Windows, errno is always errno.EINVAL,
so we can't really say if the testlink could not be created
because (a) the FS doesn't support hardlinks or (b) there
is a leaked .hgtmp file lying around from a previous crashed
run.
So let's err on the safe side, keep the code simple and assume
we can't detect hardlinks in both cases.
# this is hack to make sure no escape characters are inserted into the output
import os
if 'TERM' in os.environ:
del os.environ['TERM']
import doctest
import mercurial.changelog
doctest.testmod(mercurial.changelog)
import mercurial.dagparser
doctest.testmod(mercurial.dagparser, optionflags=doctest.NORMALIZE_WHITESPACE)
import mercurial.match
doctest.testmod(mercurial.match)
import mercurial.url
doctest.testmod(mercurial.url)
import hgext.convert.cvsps
doctest.testmod(hgext.convert.cvsps)