[PATCH 6/9] t7006: demonstrate a problem with aliases in subdirectories

[Johannes Schindelin <johannes.schindelin@gmx.de>]

When expanding aliases, the git_dir is set during the alias expansion
(by virtue of running setup_git_directory_gently()).

This git_dir may be relative to the current working directory, and
indeed often is simply ".git/".

When the alias expands to a shell command, we restore the original
working directory, though, yet we do not reset git_dir.

As a consequence, subsequent read_early_config() runs will mistake the
git_dir to be populated properly and not find the correct config.

Demonstrate this problem by adding a test case.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t7006-pager.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 4f3794d415e..83881ec3a0c 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -391,6 +391,17 @@ test_expect_success TTY 'core.pager in repo config works and retains cwd' '
 	)
 '
 
+test_expect_failure TTY 'core.pager is found via alias in subdirectory' '
+	sane_unset GIT_PAGER &&
+	test_config core.pager "cat >via-alias" &&
+	(
+		cd sub &&
+		rm -f via-alias &&
+		test_terminal git -c alias.r="-p rev-parse" r HEAD &&
+		test_path_is_file via-alias
+	)
+'
+
 test_doesnt_paginate      expect_failure test_must_fail 'git -p nonsense'
 
 test_pager_choices                       'git shortlog'
-- 
2.13.0.windows.1.460.g13f583bedb5