gecko/config/writemozinfo.py

102 lines
3.1 KiB
Python
Executable File

#!/usr/bin/env python
#
# This script is run during configure, taking variables set in configure
# and producing a JSON file that describes some portions of the build
# configuration, such as the target OS and CPU.
#
# The output file is intended to be used as input to the mozinfo package.
from __future__ import with_statement
import os, re, sys
def build_dict(env=os.environ):
"""
Build a dict containing data about the build configuration from
the environment.
"""
d = {}
# Check that all required variables are present first.
required = ["TARGET_CPU", "OS_TARGET"]
missing = [r for r in required if r not in env]
if missing:
raise Exception("Missing required environment variables: " %
', '.join(missing))
# os
o = env["OS_TARGET"]
known_os = {"Linux": "linux",
"WINNT": "win",
"Darwin": "mac",
"Android": "android"}
if o in known_os:
d["os"] = known_os[o]
else:
# Allow unknown values, just lowercase them.
d["os"] = o.lower()
# processor
p = env["TARGET_CPU"]
# do some slight massaging for some values
#TODO: retain specific values in case someone wants them?
if p.startswith("arm"):
p = "arm"
elif re.match("i[3-9]86", p):
p = "x86"
d["processor"] = p
# hardcoded list of 64-bit CPUs
if p in ["x86_64", "ppc64"]:
d["bits"] = 64
# hardcoded list of known 32-bit CPUs
elif p in ["x86", "arm", "ppc"]:
d["bits"] = 32
# other CPUs will wind up with unknown bits
# debug
d["debug"] = 'MOZ_DEBUG' in env and env['MOZ_DEBUG'] == '1'
return d
#TODO: replace this with the json module when Python >= 2.6 is a requirement.
class JsonValue:
"""
A class to serialize Python values into JSON-compatible representations.
"""
def __init__(self, v):
if v is not None and not (isinstance(v,str) or isinstance(v,bool) or isinstance(v,int)):
raise Exception("Unhandled data type: %s" % type(v))
self.v = v
def __repr__(self):
if self.v is None:
return "null"
if isinstance(self.v,bool):
return str(self.v).lower()
return repr(self.v)
def jsonify(d):
"""
Return a JSON string of the dict |d|. Only handles a subset of Python
value types: bool, str, int, None.
"""
jd = {}
for k, v in d.iteritems():
jd[k] = JsonValue(v)
return repr(jd)
def write_json(file, env=os.environ):
"""
Write JSON data about the configuration specified in |env|
to |file|, which may be a filename or file-like object.
See build_dict for information about what environment variables are used,
and what keys are produced.
"""
s = jsonify(build_dict(env))
if isinstance(file, basestring):
with open(file, "w") as f:
f.write(s)
else:
file.write(s)
if __name__ == '__main__':
try:
write_json(sys.argv[1] if len(sys.argv) > 1 else sys.stdout)
except Exception, e:
print >>sys.stderr, str(e)
sys.exit(1)