clone: delay cloning until after remote HEAD checking
This gives us an opportunity to abort the command during remote HEAD check without wasting much bandwidth. Cloning with remote-helper remains before the check because the remote helper updates mapped_refs, which is necessary for remote ref checks. foreign_vcs field is used to indicate the transport is handled by remote helper. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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