t7006: demonstrate a problem with aliases in subdirectories

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>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 4f3794d..83881ec 100755 (executable)
--- 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'