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[PATCH v2 1/1] config: report a bug if git_dir exists without commondir

From: Johannes Schindelin <johannes.schindelin@xxxxxx>

This did happen at some stage, and was fixed relatively quickly. Make
sure that we detect very quickly, too, should that happen again.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
 config.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/config.c b/config.c
index 4051e38823..db6b0167c6 100644
--- a/config.c
+++ b/config.c
@@ -1676,6 +1676,8 @@ static int do_git_config_sequence(const struct config_options *opts,
 	if (opts->commondir)
 		repo_config = mkpathdup("%s/config", opts->commondir);
+	else if (opts->git_dir)
+		BUG("git_dir without commondir");
 		repo_config = NULL;