Re: [PATCH] t7400: fix bogus test failure with symlinked trash

> On Sat, Jul 30, 2011 at 12:41:26PM +0200, Jens Lehmann wrote:
> 
>> Am 30.07.2011 02:36, schrieb Jeff King:
>>> This feels a little funny, because we are probably using the same
>>> "convert relative to absolute" code to generate our expected value, as
>>> well as in the test itself. So any bug in that code is likely to be
>>> masked. But this test isn't really about checking the absolute path
>>> code, but rather making sure that it is invoked properly.
>>
>> While the patch itself is good (apart from using backticks, I think
>> a "$()" should be used there), I share your concerns about loosing
>> an opportunity to test git functionality against the real world.
>>
>> What about doing the following instead?
>>
>> submodurl=$(cd "$TRASH_DIRECTORY"; pwd -P)
>>
>> (That pattern is already used in t/t0000-basic.sh)
> 
> That's fine by me. I assumed we didn't have any portable external tool
> we could rely on, but if we have been using "pwd -P" in t0000, it's
> probably OK.
> 
> So how about:

> -- >8 --
> Subject: [PATCH] t7400: fix bogus test failure with symlinked trash
> 
> One of the tests in t7400 fails if the trash directory has a
> symlink anywhere in its path. E.g.:
> 
>   $ mkdir /tmp/git-test
>   $ mkdir /tmp/git-test/real
>   $ ln -s real /tmp/git-test/link
> 
>   $ ./t7400-submodule-basic --root=/tmp/git-test/real
>   ...
>   # passed all 44 test(s)
> 
>   $ ./t7400-submodule-basic --root=/tmp/git-test/link
>   ...
>   not ok - 41 use superproject as upstream when path is relative and no url is set there
> 
> The failing test does:
> 
>   git submodule add ../repo relative &&
>   ...
>   git submodule sync relative &&
>   test "$(git config submodule.relative.url)" = "$submodurl/repo"
> 
> where $submodurl comes from the $TRASH_DIRECTORY the user
> gave us. However, git will resolve symlinks when converting
> the relative path into an absolute one, leading them to be
> textually different (even though they point to the same
> directory).
> 
> Fix this by asking pwd to canonicalize the name of the trash
> directory for us.
> 
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  t/t7400-submodule-basic.sh |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
> index 5afe6cc..14dc927 100755
> --- a/t/t7400-submodule-basic.sh
> +++ b/t/t7400-submodule-basic.sh
> @@ -47,8 +47,10 @@ test_expect_success 'setup - repository to add submodules to' '
>  '
>  
>  # The 'submodule add' tests need some repository to add as a submodule.
> -# The trash directory is a good one as any.
> -submodurl=$TRASH_DIRECTORY
> +# The trash directory is a good one as any. We need to canonicalize
> +# the name, though, as some tests compare it to the absolute path git
> +# generates, which will expand symbolic links.
> +submodurl=$(pwd -P)
>  
>  listbranches() {
>  	git for-each-ref --format='%(refname)' 'refs/heads/*'