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protocol: introduce protocol extension mechanisms

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Create protocol.{c,h} and provide functions which future servers and
clients can use to determine which protocol to use or is being used.

Also introduce the 'GIT_PROTOCOL' environment variable which will be
used to communicate a colon separated list of keys with optional values
to a server.  Unknown keys and values must be tolerated.  This mechanism
is used to communicate which version of the wire protocol a client would
like to use with a server.

Signed-off-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Brandon Williams
2017-10-16 10:55:24 -07:00
committed by Junio C Hamano
parent 5d2124b34a
commit 373d70efb2
6 changed files with 144 additions and 0 deletions
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8
cache.h
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@ -445,6 +445,14 @@ static inline enum object_type object_type(unsigned int mode)
#define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
#define GIT_QUARANTINE_ENVIRONMENT "GIT_QUARANTINE_PATH"
/*
* Environment variable used in handshaking the wire protocol.
* Contains a colon ':' separated list of keys with optional values
* 'key[=value]'. Presence of unknown keys and values must be
* ignored.
*/
#define GIT_PROTOCOL_ENVIRONMENT "GIT_PROTOCOL"
/*
* This environment variable is expected to contain a boolean indicating
* whether we should or should not treat: