[PATCH] t5510: run auto-gc in the foreground

["SZEDER Gábor" <szeder@ira.uka.de>]

The last test added to 't5510-fetch' in 0898c9628104 (fetch: release
pack files before garbage-collecting, 2016-01-13) may sporadically
trigger following error message from the test harness:

  rm: cannot remove 'trash directory.t5510-fetch/auto-gc/.git': Directory not empty

The test in question forces an auto-gc, which, if the system supports
it, runs in the background by default, and occasionally takes long
enough for the test to finish and for 'test_done' to start
housekeeping.  This can lead to the test's 'git gc --auto' in the
background and 'test_done's 'rm -rf $trash' in the foreground racing
each other to create and delete files and directories.  It might just
happen that 'git gc' re-creates a directory that 'rm -rf' already
visited and removed, which ultimately triggers the above error.

Disable detaching the auto-gc process to ensure that it finishes
before the test can continue, thus avoiding this racy situation.

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
---
 t/t5510-fetch.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 38321d19efbe..454d896390c0 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -682,6 +682,7 @@ test_expect_success 'fetching with auto-gc does not lock up' '
 	(
 		cd auto-gc &&
 		git config gc.autoPackLimit 1 &&
+		git config gc.autoDetach false &&
 		GIT_ASK_YESNO="$D/askyesno" git fetch >fetch.out 2>&1 &&
 		! grep "Should I try again" fetch.out
 	)
-- 
2.8.2.356.ge684b1d