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#!/usr/bin/env python
#
# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import sys
# Usage: post_process_props.py file.prop [blacklist_key, ...]
# Blacklisted keys are removed from the property file, if present
# See PROP_NAME_MAX and PROP_VALUE_MAX system_properties.h.
# The constants in system_properties.h includes the termination NUL,
# so we decrease the values by 1 here.
PROP_NAME_MAX = 31
PROP_VALUE_MAX = 91
# Put the modifications that you need to make into the /system/build.prop into this
# function. The prop object has get(name) and put(name,value) methods.
def mangle_build_prop(prop):
pass
# Put the modifications that you need to make into the /default.prop into this
# function. The prop object has get(name) and put(name,value) methods.
def mangle_default_prop(prop):
# If ro.debuggable is 1, then enable adb on USB by default
# (this is for userdebug builds)
if prop.get("ro.debuggable") == "1":
val = prop.get("persist.sys.usb.config")
if val == "":
val = "adb"
else:
val = val + ",adb"
prop.put("persist.sys.usb.config", val)
# UsbDeviceManager expects a value here. If it doesn't get it, it will
# default to "adb". That might not the right policy there, but it's better
# to be explicit.
if not prop.get("persist.sys.usb.config"):
prop.put("persist.sys.usb.config", "none");
def validate(prop):
"""Validate the properties.
Returns:
True if nothing is wrong.
"""
check_pass = True
buildprops = prop.to_dict()
dev_build = buildprops.get("ro.build.version.incremental",
"").startswith("eng")
for key, value in buildprops.iteritems():
# Check build properties' length.
if len(key) > PROP_NAME_MAX:
check_pass = False
sys.stderr.write("error: %s cannot exceed %d bytes: " %
(key, PROP_NAME_MAX))
sys.stderr.write("%s (%d)\n" % (key, len(key)))
if len(value) > PROP_VALUE_MAX:
# If dev build, show a warning message, otherwise fail the
# build with error message
if dev_build:
sys.stderr.write("warning: %s exceeds %d bytes: " %
(key, PROP_VALUE_MAX))
sys.stderr.write("%s (%d)\n" % (value, len(value)))
sys.stderr.write("warning: This will cause the %s " % key)
sys.stderr.write("property return as empty at runtime\n")
else:
check_pass = False
sys.stderr.write("error: %s cannot exceed %d bytes: " %
(key, PROP_VALUE_MAX))
sys.stderr.write("%s (%d)\n" % (value, len(value)))
return check_pass
class PropFile:
def __init__(self, lines):
self.lines = [s.strip() for s in lines]
def to_dict(self):
props = {}
for line in self.lines:
if not line or line.startswith("#"):
continue
if "=" in line:
key, value = line.split("=", 1)
props[key] = value
return props
def get(self, name):
key = name + "="
for line in self.lines:
if line.startswith(key):
return line[len(key):]
return ""
def put(self, name, value):
key = name + "="
for i in range(0,len(self.lines)):
if self.lines[i].startswith(key):
self.lines[i] = key + value
return
self.lines.append(key + value)
def delete(self, name):
key = name + "="
self.lines = [ line for line in self.lines if not line.startswith(key) ]
def write(self, f):
f.write("\n".join(self.lines))
f.write("\n")
def main(argv):
filename = argv[1]
f = open(filename)
lines = f.readlines()
f.close()
properties = PropFile(lines)
if filename.endswith("/build.prop"):
mangle_build_prop(properties)
elif filename.endswith("/default.prop"):
mangle_default_prop(properties)
else:
sys.stderr.write("bad command line: " + str(argv) + "\n")
sys.exit(1)
if not validate(properties):
sys.exit(1)
# Drop any blacklisted keys
for key in argv[2:]:
properties.delete(key)
f = open(filename, 'w+')
properties.write(f)
f.close()
if __name__ == "__main__":
main(sys.argv)
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