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.
$ hg init
$ echo a > a
$ hg ci -qAm 'add a'
$ echo b > b
$ hg ci -qAm 'add b'
$ hg up -qC 0
$ hg rm a
$ hg ci -m 'rm a'
created new head
$ hg up -qC 1
$ rm a
Local deleted a file, remote removed
Should fail, since there are deleted files:
$ hg merge
abort: outstanding uncommitted changes (use 'hg status' to list changes)
[255]
Should succeed with --force:
$ hg -v merge --force
resolving manifests
removing a
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
Should show 'a' as removed:
$ hg status
R a
$ hg ci -m merge
Should not show 'a':
$ hg manifest
b