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Pack transfer protocols
=======================
There are two Pack push-pull protocols.
upload-pack (S) | fetch/clone-pack (C) protocol:
# Tell the puller what commits we have and what their names are
S: SHA1 name
S: ...
S: SHA1 name
S: # flush -- it's your turn
# Tell the pusher what commits we want, and what we have
C: want name
C: ..
C: want name
C: have SHA1
C: have SHA1
C: ...
C: # flush -- occasionally ask "had enough?"
S: NAK
C: have SHA1
C: ...
C: have SHA1
S: ACK
C: done
S: XXXXXXX -- packfile contents.
send-pack | receive-pack protocol.
# Tell the pusher what commits we have and what their names are
C: SHA1 name
C: ...
C: SHA1 name
C: # flush -- it's your turn
# Tell the puller what the pusher has
S: old-SHA1 new-SHA1 name
S: old-SHA1 new-SHA1 name
S: ...
S: # flush -- done with the list
S: XXXXXXX --- packfile contents.
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