upload-pack: only accept commits from "shallow" line
We only allow cuts at commits, not arbitrary objects. upload-pack will fail eventually in register_shallow if a non-commit is given with a generic error "Object %s is a %s, not a commit". Check it early and give a more accurate error. This should never show up in an ordinary session. It's for buggy clients, or when the user manually edits .git/shallow. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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