for_each_commit_graft() goes through all graft points and shallow
boudaries are just one special kind of grafting. If $GIT_DIR/shallow
and $GIT_DIR/info/grafts are both present, write_shallow_commits may
catch both sets, accidentally turning some graft points to shallow
boundaries. Don't do that.

Signed-off-by: Nguyễn Thái Ngọc Duy <>
 shallow.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/shallow.c b/shallow.c
index 68dd106..5f626c0 100644
--- a/shallow.c
+++ b/shallow.c
@@ -153,6 +153,8 @@ static int write_one_shallow(const struct commit_graft 
*graft, void *cb_data)
        struct write_shallow_data *data = cb_data;
        const char *hex = sha1_to_hex(graft->sha1);
+       if (graft->nr_parent != -1)
+               return 0;
        if (data->use_pack_protocol)
                packet_buf_write(data->out, "shallow %s", hex);

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