"buildInfo" is returning wrong version information

[apkar]

As reported here, mongo shell is returning version 2.4.0. We are compatible with 3.0.0 it should return that instead.

The issue is mongo shell depends on buildInfo command response to find out version. We are updating isMaster but not buildInfo. We should change there too.

Note: Not directly related to this, but with buildInfo we don't return anything about git hash or branch information, as we are not really MongoDB. So far, that didn't seem to cause any issues, or we didn't notice yet. We do have a custom command getdoclayerversion that gives us more information on Document Layer versions.

[apkar]

This is the exact line that needs fixing - https://github.com/FoundationDB/fdb-document-layer/blob/master/src/ExtCmd.actor.cpp#L715

[dongxinEric]

IMO, the version number would better be defined in some consolidated constant value header file or something like that, instead of a plain string literal. That will make the future release process much easier, when you only have to edit one/fewer files.

[apkar]

Yeah! We should maintain some kind of map between wire protocol and server version.