Re: [PATCH] test: some testcases failed if cwd is on a symlink

[Michael Haggerty <mhagger@alum.mit.edu>]

Junio C Hamano <gitster <at> pobox.com> writes:

> 
> Jiang Xin <worldhello.net <at> gmail.com> writes:
> 
> > Run command 'git rev-parse --git-dir' under subdir will return realpath
> > of '.git' directory. Some test scripts compare this realpath against
> > "$TRASH_DIRECTORY", they are not equal if current working directory is
> > on a symlink.
> >
> > In this fix, get realpath of "$TRASH_DIRECTORY", store it in
> > "$TRASH_REALPATH" variable, and use it when necessary.
> 
> I wonder if running test in a real directory (in other words, "fix"
> your cwd) may be a simpler, more robust and generally a better
> solution, e.g. something silly like...
> 
> diff --git a/t/test-lib.sh b/t/test-lib.sh
> index acda33d..7f6fb0a 100644
> --- a/t/test-lib.sh
> +++ b/t/test-lib.sh
> @@ -15,6 +15,8 @@
>  # You should have received a copy of the GNU General Public License
>  # along with this program.  If not, see http://www.gnu.org/licenses/ .
> 
> +cd "$(pwd -P)"
> +
>  # if --tee was passed, write the output not only to the terminal, but
>  # additionally to the file test-results/$BASENAME.out, too.
>  case "$GIT_TEST_TEE_STARTED, $* " in

What is the status of this bug?  Today I wasted a bunch of time trying to track 
down a build breakage that was ultimately caused by this problem.  I was running 
the test suite on master with "--root=/dev/shm" (my usual setting), but this 
caused tests t4035 and t9903 to fail as described upthread.  (It turns out that 
on my system, /dev/shm is a symlink to /run/shm.)

For me, the failure is fixed by Jiang Xin's patch, but it is not fixed by 
Junio's.  In the case of t4035 in failing test "git diff --ignore-all-space, 
both files outside repo", right before "git diff" is called,

PWD=/run/shm/trash directory.t4035-diff-quiet/test-outside/non/git
GIT_CEILING_DIRECTORIES=/dev/shm/trash directory.t4035-diff-quiet/test-outside

I can work around the problem by using "--root=/run/shm".  But it would be good 
to get this problem fixed one way or the other to spare other people the same 
pain.

Michael