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.
Test basic functionality of url#rev syntax
$ hg init repo
$ cd repo
$ echo a > a
$ hg ci -qAm 'add a'
$ hg branch foo
marked working directory as branch foo
$ echo >> a
$ hg ci -m 'change a'
$ cd ..
$ hg clone 'repo#foo' clone
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 1 files
updating to branch foo
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --cwd clone heads
changeset: 1:cd2a86ecc814
branch: foo
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: change a
changeset: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add a
$ hg --cwd clone parents
changeset: 1:cd2a86ecc814
branch: foo
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: change a
$ cat clone/.hg/hgrc
[paths]
default = $TESTTMP/repo#foo
Changing original repo:
$ cd repo
$ echo >> a
$ hg ci -m 'new head of branch foo'
$ hg up -qC default
$ echo bar > bar
$ hg ci -qAm 'add bar'
$ hg log
changeset: 3:4cd725637392
tag: tip
parent: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add bar
changeset: 2:faba9097cad4
branch: foo
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: new head of branch foo
changeset: 1:cd2a86ecc814
branch: foo
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: change a
changeset: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add a
$ hg -q outgoing '../clone#foo'
2:faba9097cad4
$ hg -q push '../clone#foo'
$ hg --cwd ../clone heads
changeset: 2:faba9097cad4
branch: foo
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: new head of branch foo
changeset: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add a
$ cd ..
$ cd clone
$ hg rollback
rolling back to revision 1 (undo push)
$ hg -q incoming
2:faba9097cad4
$ hg -q pull
$ hg heads
changeset: 2:faba9097cad4
branch: foo
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: new head of branch foo
changeset: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add a
Pull should not have updated:
$ hg parents -q
1:cd2a86ecc814
Going back to the default branch:
$ hg up -C 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg parents
changeset: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add a
No new revs, no update:
$ hg pull -qu
$ hg parents -q
0:1f0dee641bb7
$ hg rollback
rolling back to revision 1 (undo pull)
$ hg up -C 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg parents -q
0:1f0dee641bb7
Pull -u takes us back to branch foo:
$ hg pull -qu
$ hg parents
changeset: 2:faba9097cad4
branch: foo
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: new head of branch foo
$ hg rollback
rolling back to revision 1 (undo pull)
$ hg up -C 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg parents -q
0:1f0dee641bb7
$ hg heads -q
1:cd2a86ecc814
0:1f0dee641bb7
$ hg pull -qur default default
$ hg parents
changeset: 3:4cd725637392
tag: tip
parent: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add bar
$ hg heads
changeset: 3:4cd725637392
tag: tip
parent: 0:1f0dee641bb7
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: add bar
changeset: 2:faba9097cad4
branch: foo
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: new head of branch foo