When git-clone detects that it can perform a local clone it
follows a path that silently ignores the depth parameter.
Presumably if the user explicitly requests a shallow clone they
have a reason to prefer a space efficient clone of just the recent
history so bypass the local magic if the user specifies the depth
parameter.
Signed-off-by: Charles Bailey <charles@hashpling.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>