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 add a
$ hg commit -m "1"
$ hg status
$ hg copy a b
$ hg status
A b
$ hg sum
parent: 0:c19d34741b0a tip
1
branch: default
commit: 1 copied
update: (current)
$ hg --debug commit -m "2"
b
b: copy a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
committed changeset 1:93580a2c28a50a56f63526fb305067e6fbf739c4
we should see two history entries
$ hg history -v
changeset: 1:93580a2c28a5
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
files: b
description:
2
changeset: 0:c19d34741b0a
user: test
date: Thu Jan 01 00:00:00 1970 +0000
files: a
description:
1
we should see one log entry for a
$ hg log a
changeset: 0:c19d34741b0a
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 1
this should show a revision linked to changeset 0
$ hg debugindex .hg/store/data/a.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 0 b789fdd96dc2 000000000000 000000000000
we should see one log entry for b
$ hg log b
changeset: 1:93580a2c28a5
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 2
this should show a revision linked to changeset 1
$ hg debugindex .hg/store/data/b.i
rev offset length base linkrev nodeid p1 p2
0 0 65 0 1 37d9b5d994ea 000000000000 000000000000
this should show the rename information in the metadata
$ hg debugdata .hg/store/data/b.d 0 | head -3 | tail -2
copy: a
copyrev: b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
$ $TESTDIR/md5sum.py .hg/store/data/b.i
4999f120a3b88713bbefddd195cf5133 .hg/store/data/b.i
$ hg cat b > bsum
$ $TESTDIR/md5sum.py bsum
60b725f10c9c85c70d97880dfe8191b3 bsum
$ hg cat a > asum
$ $TESTDIR/md5sum.py asum
60b725f10c9c85c70d97880dfe8191b3 asum
$ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
2 files, 2 changesets, 2 total revisions