If we borrow objects from another repository, we should also pay
attention to their $GIT_DIR/shallow (and even info/grafts). But
current alternates code does not.

Reject alternate repos that are shallow because we do not do it
right. In future we alternate code may be updated to check
$GIT_DIR/shallow properly so that this restriction could be lifted.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
 builtin/clone.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/builtin/clone.c b/builtin/clone.c
index 874e0fd..900f564 100644
--- a/builtin/clone.c
+++ b/builtin/clone.c
@@ -252,6 +252,12 @@ static int add_one_reference(struct string_list_item 
*item, void *cb_data)
                die(_("reference repository '%s' is not a local repository."),
+       if (!access(mkpath("%s/shallow", ref_git), F_OK))
+               die(_("reference repository '%s' is shallow"), item->string);
+       if (!access(mkpath("%s/info/grafts", ref_git), F_OK))
+               die(_("reference repository '%s' is grafted"), item->string);
        strbuf_addf(&alternate, "%s/objects", ref_git);

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