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.
$ cat <<EOF >> $HGRCPATH
> [extensions]
> notify=
>
> [hooks]
> changegroup.notify = python:hgext.notify.hook
>
> [notify]
> sources = push
> diffstat = False
> maxsubject = 10
>
> [usersubs]
> foo@bar = *
>
> [reposubs]
> * = baz
> EOF
$ hg init a
clone
$ hg --traceback clone a b
updating to branch default
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo a > b/a
commit
$ hg --traceback --cwd b commit -Ama
adding a
$ echo a >> b/a
commit
$ hg --traceback --cwd b commit -Amb
push
$ hg --traceback --cwd b push ../a 2>&1 |
> python -c 'import sys,re; print re.sub("\n\t", " ", sys.stdin.read()),'
pushing to ../a
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 1 files
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Date: * (glob)
Subject: * (glob)
From: test
X-Hg-Notification: changeset cb9a9f314b8b
Message-Id: <*> (glob)
To: baz, foo@bar
changeset cb9a9f314b8b in $TESTTMP/a
details: $TESTTMP/a?cmd=changeset;node=cb9a9f314b8b
summary: a
changeset ba677d0156c1 in $TESTTMP/a
details: $TESTTMP/a?cmd=changeset;node=ba677d0156c1
summary: b
diffs (6 lines):
diff -r 000000000000 -r ba677d0156c1 a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/a Thu Jan 01 00:00:00 1970 +0000
@@ -0,0 +1,2 @@
+a
+a