[PATCH 1/3] t0000: set TEST_OUTPUT_DIRECTORY for sub-tests

[Jeff King <peff@peff.net>]

Once upon a time, the test-lib library would create trash
directories in the current working directory, unless we were
explicitly told to put it elsewhere via --root. As a result,
t0000 created the sub-test trash directories inside its own
trash directory.

However, we noticed that this did not cover all cases, since
we would need to respect $TEST_OUTPUT_DIRECTORY even if
--root is not given (or is relative). Commit 38b074d fixed
this to consistently use the full path.

As a result, t0000's sub-tests are now created in git's
original test output directory rather than in our trash
directory. Furthermore, since some of the sub-tests simulate
failures, the trash directories do not get cleaned up, and
the cruft is left in the t/ directory.

We could fix this by passing a new "--root=$TRASH_DIRECTORY"
option to the sub-test. However, we do not want the sub-tests
to write anything at all to git's directory (e.g., they
should not be writing to t/test-results, either, although
this is already handled by separate code).  So the best
solution is to simply reset $TEST_OUTPUT_DIRECTORY entirely
in the sub-test, which covers this case, as well as any
future ones.

Signed-off-by: Jeff King <peff@peff.net>
---
 t/t0000-basic.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index 10be52b..bc4e3e2 100755
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh
@@ -71,6 +71,8 @@ run_sub_test_lib_test () {
 		cat >>"$name.sh" &&
 		chmod +x "$name.sh" &&
 		export TEST_DIRECTORY &&
+		TEST_OUTPUT_DIRECTORY=$(pwd) &&
+		export TEST_OUTPUT_DIRECTORY &&
 		./"$name.sh" "$@" >out 2>err
 	)
 }
-- 
1.8.5.1.399.g900e7cd