[PATCH] rebase: exec leaks GIT_DIR to environment

From: Jacob Keller <redacted>

I noticed a failure with git rebase interactive mode which causes "exec"
commands to be run with GIT_DIR set. When GIT_DIR is in the environment,
then any command which results in running a git command in
a subdirectory will fail because GIT_DIR=".git".

This unfortunately breaks one of my project's Makefiles, which uses
git-describe to find the version information, but does so from within
a sub directory.

I'm in the process of running a bisect to find where this got
introduced, but I suspect it's part of the rebase--helper changes that
happened a while ago.

Signed-off-by: Jacob Keller <redacted>
---
 t/t3404-rebase-interactive.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 3704dbb2ecf6..60ab5136f702 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh

@@ -108,6 +108,17 @@ test_expect_success 'rebase -i with the exec command runs from tree root' '
 	rm -fr subdir
 '
 
+test_expect_failure 'rebase -i with the exec git commands in subdirs still work' '
+	test_when_finished "rm -ff subdir" &&
+	test_when_finished "git rebase --abort" &&
+	git checkout master &&
+	mkdir subdir && (cd subdir &&
+	set_fake_editor &&
+	FAKE_LINES="1 exec_>cd_subdir_&&_git_rev-parse_--is-inside-work-tree" \
+		git rebase -i HEAD^
+	)
+'
+
 test_expect_success 'rebase -i with the exec command checks tree cleanness' '
 	git checkout master &&
 	set_fake_editor &&

-- 
2.11.1.4.gad8c7cd