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Currently, while performing packfile negotiation, clients are only allowed to specify their desired objects using object ids. This causes a vulnerability to failure when an object turns non-existent during negotiation, which may happen if, for example, the desired repository is provided by multiple Git servers in a load-balancing arrangement and there exists replication delay. In order to eliminate this vulnerability, implement the ref-in-want feature for the 'fetch' command in protocol version 2. This feature enables the 'fetch' command to support requests in the form of ref names through a new "want-ref <ref>" parameter. At the conclusion of negotiation, the server will send a list of all of the wanted references (as provided by "want-ref" lines) in addition to the generated packfile. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>