path: root/protocol.c
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2020-04-22Revert "fetch: default to protocol version 2"Jonathan Nieder
This reverts commit 684ceae32dae726c6a5c693b257b156926aba8b7. Users fetching from linux-next and other kernel remotes are reporting that the limited ref advertisement causes negotiation to reach MAX_IN_VAIN, resulting in too-large fetches. Reported-by: Lubomir Rintel <> Reported-by: "Dixit, Ashutosh" <> Reported-by: Jiri Slaby <> Reported-by: Konstantin Ryabitsev <> Signed-off-by: Jonathan Nieder <> Signed-off-by: Junio C Hamano <>
2020-01-15fetch: default to protocol version 2Jonathan Nieder
The Git users at $DAYJOB have been using protocol v2 as a default for ~1.5 years now and others have been also reporting good experiences with it, so it seems like a good time to bump the default version. It produces a significant performance improvement when fetching from repositories with many refs, such as This only affects the client, not the server. (The server already defaults to supporting protocol v2.) The protocol change is backward compatible, so this should produce no significant effect when contacting servers that only speak protocol v0. Signed-off-by: Jonathan Nieder <> Signed-off-by: Junio C Hamano <>
2020-01-15protocol test: let protocol.version override GIT_TEST_PROTOCOL_VERSIONJonathan Nieder
The GIT_TEST_PROTOCOL_VERSION environment variable can be used to upgrade the version of Git protocol used in tests. If both GIT_TEST_PROTOCOL_VERSION and 'protocol.version' are set, the higher value wins. For usage within tests, these semantics are too complex. Instead, always use the value from protocol.version configuration when it is set, falling back to GIT_TEST_PROTOCOL_VERSION. This way, the envvar provides a reliable preview of what will happen if the default protocol version is changed. Signed-off-by: Jonathan Nieder <> Signed-off-by: Junio C Hamano <>
2019-03-07tests: define GIT_TEST_PROTOCOL_VERSIONJonathan Tan
Define a GIT_TEST_PROTOCOL_VERSION environment variable meant to be used from tests. When set, this ensures protocol.version is at least the given value, allowing the entire test suite to be run as if this configuration is in place for all repositories. As of this patch, all tests pass whether GIT_TEST_PROTOCOL_VERSION is unset or set to 0. Some tests fail when GIT_TEST_PROTOCOL_VERSION is set to 1 or 2, but this will be dealt with in subsequent patches. This is based on work by Ævar Arnfjörð Bjarmason. Signed-off-by: Jonathan Tan <> Signed-off-by: Junio C Hamano <>
2018-03-14protocol: introduce enum protocol_version value protocol_v2Brandon Williams
Introduce protocol_v2, a new value for 'enum protocol_version'. Subsequent patches will fill in the implementation of protocol_v2. Signed-off-by: Brandon Williams <> Signed-off-by: Junio C Hamano <>
2017-10-17protocol: introduce protocol extension mechanismsBrandon Williams
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 <> Signed-off-by: Junio C Hamano <>