Major - P3 Write a new variables file called "etc/scons/developer_versioning.vars" that sets MONGO_VERSION using the latest git tag and MONGO_GIT_HASH with some string constant. It may look something like this:
import os
import subprocess
def short_describe():
import os
import subprocess
with open(os.devnull, "r+") as devnull:
proc = subprocess.Popen("git describe --abbrev=0",
stdout=subprocess.PIPE,
stderr=devnull,
stdin=devnull,
shell=True)
return proc.communicate()[0].decode('utf-8').strip()[1:]
MONGO_GIT_HASH="unknown"
MONGO_VERSION=short_describe()