[SERVER-21286] versionArray not computed correctly from git-describe - MongoDB Jira

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Below is a stand-alone python script with the code from SConscript that generates version information for version.cpp.in:

#!/usr/bin/python

import re

import sys

VER = sys.argv[1]

version_parts = [ x for x in re.match(r'^(\d+)\.(\d+)\.(\d+)-?((?:(rc)(\d+))?.*)?', VER).groups() ]

version_extra = version_parts[3] if version_parts[3] else ""

if version_parts[4] == 'rc':

    version_parts[3] = int(version_parts[5]) + -50

elif version_parts[3]:

    version_parts[3] = -100

else:

    version_parts[3] = 0

version_array = [ int(x) for x in version_parts[:4]]

print version_array

It produces the following output:

$ ./ver.py 3.3.1

[3, 3, 1, 0]

$ ./ver.py 3.3.1-1-abcd

[3, 3, 1, -100]

This indicates that 3.3.1 is newer than the first commit after 3.3.1, which is wrong.

related to

SERVER-17329 Improve management of server version in build system