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131 lines
3.9 KiB
Python
131 lines
3.9 KiB
Python
"""Various utility functions"""
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# Copyright (C) 2006-2007 Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import time
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import sha
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import random
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import binascii
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import string
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import os
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import logging
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from ConfigParser import ConfigParser
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from ConfigParser import NoOptionError
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def printable_hash(in_hash):
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"""Convert binary hash data into printable characters."""
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printable = ""
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for char in in_hash:
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printable = printable + binascii.b2a_hex(char)
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return printable
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def _sha_data(data):
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"""sha1 hash some bytes."""
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sha_hash = sha.new()
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sha_hash.update(data)
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return sha_hash.digest()
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def unique_id(data = ''):
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"""Generate a likely-unique ID for whatever purpose
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data -- suffix appended to working data before hashing
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Returns a 40-character string with hexidecimal digits
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representing an SHA hash of the time, a random digit
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within a constrained range and the data passed.
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Note: these are *not* crypotographically secure or
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globally unique identifiers. While they are likely
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to be unique-enough, no attempt is made to make
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perfectly unique values.
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"""
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data_string = "%s%s%s" % (time.time(), random.randint(10000, 100000), data)
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return printable_hash(_sha_data(data_string))
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ACTIVITY_ID_LEN = 40
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def is_hex(s):
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return s.strip(string.hexdigits) == ''
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def validate_activity_id(actid):
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"""Validate an activity ID."""
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if not isinstance(actid, (str,unicode)):
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return False
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if len(actid) != ACTIVITY_ID_LEN:
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return False
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if not is_hex(actid):
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return False
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return True
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class _ServiceParser(ConfigParser):
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def optionxform(self, option):
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return option
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def write_service(name, bin, path):
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"""Write a D-BUS service definition file
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These are written by the bundleregistry when
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a new activity is registered. They bind a
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D-BUS bus-name with an executable which is
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to provide the named service.
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name -- D-BUS service name, must be a valid
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filename/D-BUS name
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bin -- executable providing named service
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path -- directory into which to write the
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name.service file
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The service files themselves are written using
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the _ServiceParser class, which is a subclass
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of the standard ConfigParser class.
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"""
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service_cp = _ServiceParser()
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section = 'D-BUS Service'
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service_cp.add_section(section)
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service_cp.set(section, 'Name', name)
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service_cp.set(section, 'Exec', bin)
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dest_filename = os.path.join(path, name + '.service')
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fileobject = open(dest_filename, 'w')
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service_cp.write(fileobject)
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fileobject.close()
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def set_proc_title(title):
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"""Sets the process title so ps and top show more
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descriptive names. This does not modify argv[0]
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and only the first 15 characters will be shown.
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title -- the title you wish to change the process
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title to
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Returns True on success. We don't raise exceptions
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because if something goes wrong here it is not a big
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deal as this is intended as a nice thing to have for
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debugging
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"""
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try:
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import ctypes
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libc = ctypes.CDLL('libc.so.6')
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libc.prctl(15, str(title), 0, 0, 0)
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return True
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except:
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return False
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