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-Long-running process protocol
-=============================
-
-This protocol is used when Git needs to communicate with an external
-process throughout the entire life of a single Git command. All
-communication is in pkt-line format (see technical/protocol-common.txt)
-over standard input and standard output.
-
-Handshake
----------
-
-Git starts by sending a welcome message (for example,
-"git-filter-client"), a list of supported protocol version numbers, and
-a flush packet. Git expects to read the welcome message with "server"
-instead of "client" (for example, "git-filter-server"), exactly one
-protocol version number from the previously sent list, and a flush
-packet. All further communication will be based on the selected version.
-The remaining protocol description below documents "version=2". Please
-note that "version=42" in the example below does not exist and is only
-there to illustrate how the protocol would look like with more than one
-version.
-
-After the version negotiation Git sends a list of all capabilities that
-it supports and a flush packet. Git expects to read a list of desired
-capabilities, which must be a subset of the supported capabilities list,
-and a flush packet as response:
-------------------------
-packet:          git> git-filter-client
-packet:          git> version=2
-packet:          git> version=42
-packet:          git> 0000
-packet:          git< git-filter-server
-packet:          git< version=2
-packet:          git< 0000
-packet:          git> capability=clean
-packet:          git> capability=smudge
-packet:          git> capability=not-yet-invented
-packet:          git> 0000
-packet:          git< capability=clean
-packet:          git< capability=smudge
-packet:          git< 0000
-------------------------
-
-Shutdown
---------
-
-Git will close
-the command pipe on exit. The filter is expected to detect EOF
-and exit gracefully on its own. Git will wait until the filter
-process has stopped.