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#!/usr/bin/env python
"""
This script generates the compile expansions file used by Evergreen as part of the push/release
process.
Invoke by specifying an output file.
$ python generate_compile_expansions.py --out compile_expansions.yml
"""
import argparse
import json
import os
import re
import sys
import yaml
version_json = "version.json"
def generate_expansions():
"""Entry point for the script.
This calls functions to generate version and scons cache expansions and
writes them to a file.
"""
args = parse_args()
expansions = {}
expansions.update(generate_version_expansions(args))
expansions.update(generate_scons_cache_expansions())
with open(args.out, "w") as out:
print("saving compile expansions to {0}: ({1})".format(args.out, expansions))
yaml.safe_dump(expansions, out, default_flow_style=False)
def parse_args():
parser = argparse.ArgumentParser()
parser.add_argument("--out", required=True)
return parser.parse_args()
def generate_version_expansions(args):
"""Generate expansions from a version.json file if given, or $MONGO_VERSION."""
expansions = {}
if os.path.exists(version_json):
with open(version_json, "r") as f:
data = f.read()
version_data = json.loads(data)
version_line = version_data['version']
version_parts = match_verstr(version_line)
if not version_parts:
raise ValueError("Unable to parse version.json")
else:
if not os.getenv("MONGO_VERSION"):
raise Exception("$MONGO_VERSION not set and no version.json provided")
version_line = os.getenv("MONGO_VERSION").lstrip("r")
version_parts = match_verstr(version_line)
if not version_parts:
raise ValueError("Unable to parse version from stdin and no version.json provided")
if version_parts[0]:
expansions["suffix"] = "latest"
expansions["src_suffix"] = "latest"
else:
expansions["suffix"] = version_line
expansions["src_suffix"] = "r{0}".format(version_line)
expansions["version"] = version_line
return expansions
def generate_scons_cache_expansions():
"""Generate scons cache expansions from some files and environment variables."""
expansions = {}
if sys.platform.startswith("win"):
system_id_path = r"c:\mongodb-build-system-id"
default_cache_path_base = r"z:\data\scons-cache"
else:
system_id_path = "/etc/mongodb-build-system-id"
default_cache_path_base = "/data/scons-cache"
if os.path.isfile(system_id_path):
with open(system_id_path, "r") as f:
default_cache_path = os.path.join(default_cache_path_base, f.readline().strip())
expansions["scons_cache_path"] = default_cache_path
scons_cache_mode = os.getenv("SCONS_CACHE_MODE")
if scons_cache_mode in (None, ""):
scons_cache_mode = "nolinked"
if os.getenv("USE_SCONS_CACHE") not in (None, False, "false", ""):
expansions["scons_cache_args"] = "--cache={0} --cache-dir='{1}'".format(
scons_cache_mode, default_cache_path)
return expansions
def match_verstr(verstr):
"""
This function matches a version string and captures the "extra" part.
If the version is a release like "2.3.4" or "2.3.4-rc0", this will return
None. If the version is a pre-release like "2.3.4-325-githash" or
"2.3.4-pre-", this will return "-pre-" or "-325-githash" If the version
begins with the letter 'r', it will also match, e.g. r2.3.4, r2.3.4-rc0,
r2.3.4-git234, r2.3.4-rc0-234-githash If the version is invalid (i.e.
doesn't start with "2.3.4" or "2.3.4-rc0", this will return False.
"""
res = re.match(r'^r?(?:\d+\.\d+\.\d+(?:-rc\d+)?)(-.*)?', verstr)
if not res:
return False
return res.groups()
if __name__ == "__main__":
generate_expansions()
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