#! /usr/bin/env python ############################################################################ # Copyright (C) 2002 Paul Rodger # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ############################################################################ """ Archive and compress old mail in mbox, MH or maildir-format mailboxes. Website: http://archivemail.sourceforge.net/ """ # global administrivia __version__ = "archivemail v0.5.0" __cvs_id__ = "$Id$" __copyright__ = """Copyright (C) 2002 Paul Rodger This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.""" import sys def check_python_version(): """Abort if we are running on python < v2.0""" too_old_error = """This program requires python v2.0 or greater. Your version of python is: %s""" % sys.version try: version = sys.version_info # we might not even have this function! :) if (version[0] < 2): print too_old_error sys.exit(1) except AttributeError: print too_old_error sys.exit(1) check_python_version() # define & run this early because 'atexit' is new import atexit import fcntl import getopt import gzip import mailbox import os import pwd import re import rfc822 import shutil import signal import stat import string import tempfile import time ############## class definitions ############### class Stats: """Class to collect and print statistics about mailbox archival""" __archived = 0 __mailbox_name = None __archive_name = None __start_time = 0 __total = 0 def __init__(self, mailbox_name, final_archive_name): """Constructor for a new set of statistics. Arguments: mailbox_name -- filename/dirname of the original mailbox final_archive_name -- filename for the final 'mbox' archive, without compression extension (eg .gz) """ assert(mailbox_name) assert(final_archive_name) self.__start_time = time.time() self.__mailbox_name = mailbox_name self.__archive_name = final_archive_name + ".gz" def another_message(self): """Add one to the internal count of total messages processed""" self.__total = self.__total + 1 def another_archived(self): """Add one to the internal count of messages archived""" self.__archived = self.__archived + 1 def display(self): """Print statistics about how many messages were archived""" end_time = time.time() time_seconds = end_time - self.__start_time action = "archived" if options.delete_old_mail: action = "deleted" if options.dry_run: action = "I would have " + action print "%s: %s %d of %d message(s) in %.1f seconds" % \ (self.__mailbox_name, action, self.__archived, self.__total, time_seconds) class StaleFiles: """Class to keep track of files to be deleted on abnormal exit""" archive = None # tempfile for messages to be archived procmail_lock = None # original_mailbox.lock retain = None # tempfile for messages to be retained temp_dir = None # our tempfile directory container def clean(self): """Delete any temporary files or lockfiles that exist""" if self.procmail_lock: vprint("removing stale procmail lock '%s'" % self.procmail_lock) try: os.remove(self.procmail_lock) except (IOError, OSError): pass if self.retain: vprint("removing stale retain file '%s'" % self.retain) try: os.remove(self.retain) except (IOError, OSError): pass if self.archive: vprint("removing stale archive file '%s'" % self.archive) try: os.remove(self.archive) except (IOError, OSError): pass if self.temp_dir: vprint("removing stale tempfile directory '%s'" % self.temp_dir) try: os.rmdir(self.temp_dir) except (IOError, OSError): pass class Options: """Class to store runtime options, including defaults""" archive_suffix = "_archive" days_old_max = 180 date_old_max = None delete_old_mail = 0 dry_run = 0 include_flagged = 0 lockfile_attempts = 5 lockfile_extension = ".lock" lockfile_sleep = 1 no_compress = 0 only_archive_read = 0 output_dir = None preserve_unread = 0 quiet = 0 read_buffer_size = 8192 script_name = os.path.basename(sys.argv[0]) min_size = None verbose = 0 warn_duplicates = 0 def parse_args(self, args, usage): """Set our runtime options from the command-line arguments. Arguments: args -- this is sys.argv[1:] usage -- a usage message to display on '--help' or bad arguments Returns the remaining command-line arguments that have not yet been parsed as a string. """ try: opts, args = getopt.getopt(args, '?D:S:Vd:hno:qs:uv', ["date=", "days=", "delete", "dry-run", "help", "include-flagged", "no-compress", "output-dir=", "preserve-unread", "quiet", "size=", "suffix=", "verbose", "version", "warn-duplicate"]) except getopt.error, msg: user_error(msg) archive_by = None for o, a in opts: if o == '--delete': self.delete_old_mail = 1 if o == '--include-flagged': self.include_flagged = 1 if o == '--no-compress': self.no_compress = 1 if o == '--warn-duplicate': self.warn_duplicates = 1 if o in ('-D', '--date'): if archive_by: user_error("you cannot specify both -d and -D options") archive_by = "date" self.date_old_max = self.date_argument(a) if o in ('-d', '--days'): if archive_by: user_error("you cannot specify both -d and -D options") archive_by = "days" self.days_old_max = string.atoi(a) if o in ('-o', '--output-dir'): self.output_dir = a if o in ('-h', '-?', '--help'): print usage sys.exit(0) if o in ('-n', '--dry-run'): self.dry_run = 1 if o in ('-q', '--quiet'): self.quiet = 1 if o in ('-s', '--suffix'): self.archive_suffix = a if o in ('-S', '--size'): self.min_size = string.atoi(a) if o in ('-u', '--preserve-unread'): self.preserve_unread = 1 if o in ('-v', '--verbose'): self.verbose = 1 if o in ('-V', '--version'): print __version__ + "\n\n" + __copyright__ sys.exit(0) return args def sanity_check(self): """Complain bitterly about our options now rather than later""" if self.output_dir: if not os.path.isdir(self.output_dir): user_error("output directory does not exist: '%s'" % \ self.output_dir) if not os.access(self.output_dir, os.W_OK): user_error("no write permission on output directory: '%s'" % \ self.output_dir) if is_world_writable(self.output_dir): unexpected_error(("output directory is world-writable: " + \ "%s -- I feel nervous!") % self.output_dir) if self.days_old_max < 1: user_error("--days argument must be greater than zero") if self.days_old_max >= 10000: user_error("--days argument must be less than 10000") if self.min_size is not None and self.min_size < 1: user_error("--size argument must be greater than zero") if self.quiet and self.verbose: user_error("you cannot use both the --quiet and --verbose options") def date_argument(self, string): """Converts a date argument string into seconds since the epoch""" date_formats = ( "%Y-%m-%d", # ISO format "%d %b %Y" , # Internet format "%d %B %Y" , # Internet format with full month names ) time.accept2dyear = 0 # I'm not going to support 2-digit years for format in date_formats: try: date = time.strptime(string, format) seconds = time.mktime(date) return seconds except (ValueError, OverflowError): pass user_error("cannot parse the date argument '%s'\n" "The date should be in ISO format (eg '2002-04-23'),\n" "Internet format (eg '23 Apr 2002') or\n" "Internet format with full month names (eg '23 April 2002')" % string) class Mbox(mailbox.UnixMailbox): """Class that allows read/write access to a 'mbox' mailbox. Subclasses the mailbox.UnixMailbox class. """ mbox_file = None # file handle for the mbox file mbox_file_name = None # GzipFile class has no .name variable mbox_file_closed = 0 # GzipFile class has no .closed variable original_atime = None # last-accessed timestamp original_mtime = None # last-modified timestamp original_mode = None # file permissions to preserve starting_size = None # file size of mailbox on open def __init__(self, path, mode="r+"): """Constructor for opening an existing 'mbox' mailbox. Extends constructor for mailbox.UnixMailbox() Named Arguments: path -- file name of the 'mbox' file to be opened mode -- mode to open the file in (default is read-write) """ assert(path) try: self.original_atime = os.path.getatime(path) self.original_mtime = os.path.getmtime(path) self.original_mode = os.stat(path)[stat.ST_MODE] self.starting_size = os.path.getsize(path) self.mbox_file = open(path, mode) except IOError, msg: unexpected_error(msg) self.mbox_file_name = path mailbox.UnixMailbox.__init__(self, self.mbox_file) def write(self, msg): """Write a rfc822 message object to the 'mbox' mailbox. If the rfc822 has no Unix 'From_' line, then one is constructed from other headers in the message. Arguments: msg -- rfc822 message object to be written """ assert(msg) assert(self.mbox_file) vprint("saving message to file '%s'" % self.mbox_file_name) unix_from = msg.unixfrom if not unix_from: unix_from = make_mbox_from(msg) self.mbox_file.write(unix_from) assert(msg.headers) self.mbox_file.writelines(msg.headers) self.mbox_file.write(os.linesep) # The following while loop is about twice as fast in # practice to 'self.mbox_file.writelines(msg.fp.readlines())' assert(options.read_buffer_size > 0) while 1: body = msg.fp.read(options.read_buffer_size) if not body: break self.mbox_file.write(body) def remove(self): """Close and delete the 'mbox' mailbox file""" file_name = self.mbox_file_name self.close() vprint("removing file '%s'" % self.mbox_file_name) os.remove(file_name) def is_empty(self): """Return true if the 'mbox' file is empty, false otherwise""" return (os.path.getsize(self.mbox_file_name) == 0) def close(self): """Close the mbox file""" if not self.mbox_file_closed: vprint("closing file '%s'" % self.mbox_file_name) self.mbox_file.close() self.mbox_file_closed = 1 def reset_stat(self): """Set the file timestamps and mode to the original value""" assert(self.original_atime) assert(self.original_mtime) assert(self.mbox_file_name) assert(self.original_mode) # I doubt this will be 000? os.utime(self.mbox_file_name, (self.original_atime, \ self.original_mtime)) os.chmod(self.mbox_file_name, self.original_mode) def exclusive_lock(self): """Set an advisory lock on the 'mbox' mailbox""" vprint("obtaining exclusive lock on file '%s'" % self.mbox_file_name) fcntl.flock(self.mbox_file.fileno(), fcntl.LOCK_EX) def exclusive_unlock(self): """Unset any advisory lock on the 'mbox' mailbox""" vprint("dropping exclusive lock on file '%s'" % self.mbox_file_name) fcntl.flock(self.mbox_file.fileno(), fcntl.LOCK_UN) def procmail_lock(self): """Create a procmail lockfile on the 'mbox' mailbox""" lock_name = self.mbox_file_name + options.lockfile_extension attempt = 0 while os.path.isfile(lock_name): vprint("lockfile '%s' exists - sleeping..." % lock_name) time.sleep(options.lockfile_sleep) attempt = attempt + 1 if (attempt >= options.lockfile_attempts): unexpected_error("Giving up waiting for procmail lock '%s'" % lock_name) vprint("writing lockfile '%s'" % lock_name) old_umask = os.umask(022) # is this dodgy? lock = open(lock_name, "w") _stale.procmail_lock = lock_name lock.close() old_umask = os.umask(old_umask) def procmail_unlock(self): """Delete the procmail lockfile on the 'mbox' mailbox""" assert(self.mbox_file_name) lock_name = self.mbox_file_name + options.lockfile_extension vprint("removing lockfile '%s'" % lock_name) os.remove(lock_name) _stale.procmail_lock = None def leave_empty(self): """Replace the 'mbox' mailbox with a zero-length file. This should be the same as 'cp /dev/null mailbox'. This will leave a zero-length mailbox file so that mail reading programs don't get upset that the mailbox has been completely deleted.""" assert(os.path.isfile(self.mbox_file_name)) vprint("turning '%s' into a zero-length file" % self.mbox_file_name) blank_file = open(self.mbox_file_name, "w") blank_file.close() def get_size(self): """Return the current size of the mbox file""" return os.path.getsize(self.mbox_file_name) class RetainMbox(Mbox): """Class for holding messages that will be retained from the original mailbox (ie. the messages are not considered 'old'). Extends the 'Mbox' class. This 'mbox' file starts off as a temporary file but will eventually overwrite the original mailbox if everything is OK. """ __final_name = None def __init__(self, final_name): """Constructor - create a temporary file for the mailbox. Arguments: final_name -- the name of the original mailbox that this mailbox will replace when we call finalise() """ assert(final_name) temp_name = tempfile.mktemp("retain") self.mbox_file = open(temp_name, "w") self.mbox_file_name = temp_name _stale.retain = temp_name vprint("opened temporary retain file '%s'" % self.mbox_file_name) self.__final_name = final_name def finalise(self): """Overwrite the original mailbox with this temporary mailbox.""" assert(self.__final_name) self.close() # make sure that the retained mailbox has the same timestamps and # permission as the original mailbox atime = os.path.getatime(self.__final_name) mtime = os.path.getmtime(self.__final_name) mode = os.stat(self.__final_name)[stat.ST_MODE] os.chmod(self.mbox_file_name, mode) vprint("renaming '%s' to '%s'" % (self.mbox_file_name, self.__final_name)) try: os.rename(self.mbox_file_name, self.__final_name) except OSError: # file might be on a different filesystem -- move it manually shutil.copy2(self.mbox_file_name, self.__final_name) os.remove(self.mbox_file_name) os.utime(self.__final_name, (atime, mtime)) # reset to original timestamps _stale.retain = None def remove(self): """Delete this temporary mailbox. Overrides Mbox.remove()""" Mbox.remove(self) _stale.retain = None class ArchiveMbox(Mbox): """Class for holding messages that will be archived from the original mailbox (ie. the messages that are considered 'old'). Extends the 'Mbox' class. This 'mbox' file starts off as a temporary file, copied from any pre-existing archive. It will eventually overwrite the original archive mailbox if everything is OK. """ __final_name = None def __init__(self, final_name): """Constructor -- copy any pre-existing compressed archive to a temporary file which we use as the new 'mbox' archive for this mailbox. Arguments: final_name -- the final name for this archive mailbox. This function will check to see if the filename already exists, and copy it to a temporary file if it does. It will also rename itself to this name when we call finalise() """ assert(final_name) if options.no_compress: self.__init_uncompressed(final_name) else: self.__init_compressed(final_name) self.__final_name = final_name def __init_uncompressed(self, final_name): """Used internally by __init__ when archives are uncompressed""" assert(final_name) compressed_archive = final_name + ".gz" if os.path.isfile(compressed_archive): unexpected_error("""There is already a file named '%s'! Have you been previously compressing this archive? You probably should uncompress it manually, and try running me again.""" % compressed_archive) temp_name = tempfile.mktemp("archive") if os.path.isfile(final_name): vprint("file already exists that is named: %s" % final_name) shutil.copy2(final_name, temp_name) _stale.archive = temp_name self.mbox_file = open(temp_name, "a") self.mbox_file_name = temp_name def __init_compressed(self, final_name): """Used internally by __init__ when archives are compressed""" assert(final_name) compressed_filename = final_name + ".gz" if os.path.isfile(final_name): unexpected_error("""There is already a file named '%s'! Have you been reading this archive? You probably should re-compress it manually, and try running me again.""" % final_name) temp_name = tempfile.mktemp("archive.gz") if os.path.isfile(compressed_filename): vprint("file already exists that is named: %s" % \ compressed_filename) shutil.copy2(compressed_filename, temp_name) _stale.archive = temp_name self.mbox_file = gzip.GzipFile(temp_name, "a") self.mbox_file_name = temp_name def finalise(self): """Close the archive and rename this archive temporary file to the final archive filename, overwriting any pre-existing archive if it exists. """ assert(self.__final_name) self.close() final_name = self.__final_name if not options.no_compress: final_name = final_name + ".gz" vprint("renaming '%s' to '%s'" % (self.mbox_file_name, final_name)) try: os.rename(self.mbox_file_name, final_name) except OSError: # file might be on a different filesystem -- move it manually shutil.copy2(self.mbox_file_name, final_name) os.remove(self.mbox_file_name) _stale.archive = None class IdentityCache: """Class used to remember Message-IDs and warn if they are seen twice""" seen_ids = {} mailbox_name = None def __init__(self, mailbox_name): """Constructor: takes the mailbox name as an argument""" assert(mailbox_name) self.mailbox_name = mailbox_name def warn_if_dupe(self, msg): """Print a warning message if the message has already appeared""" assert(msg) message_id = msg.get('Message-ID') assert(message_id) if self.seen_ids.has_key(message_id): user_warning("duplicate message id: '%s' in mailbox '%s'" % (message_id, self.mailbox_name)) self.seen_ids[message_id] = 1 # global class instances options = Options() # the run-time options object _stale = StaleFiles() # remember what we have to delete on abnormal exit def main(args = sys.argv[1:]): global _stale # this usage message is longer than 24 lines -- bad idea? usage = """Usage: %s [options] mailbox [mailbox...] Moves old mail in mbox, MH or maildir-format mailboxes to an mbox-format mailbox compressed with gzip. Options are as follows: -d, --days=NUM archive messages older than NUM days (default: %d) -D, --date=DATE archive messages older than DATE -o, --output-dir=DIR directory to store archives (default: same as original) -s, --suffix=NAME suffix for archive filename (default: '%s') -S, --size=NUM only archive messages NUM bytes or larger -n, --dry-run don't write to anything - just show what would be done -u, --preserve-unread never archive unread messages --delete delete rather than archive old mail (use with caution!) --include-flagged messages flagged important can also be archived --no-compress do not compress archives with gzip --warn-duplicate warn about duplicate Message-IDs in the same mailbox -v, --verbose report lots of extra debugging information -q, --quiet quiet mode - print no statistics (suitable for crontab) -V, --version display version information -h, --help display this message Example: %s linux-kernel This will move all messages older than %s days to a 'mbox' mailbox called 'linux-kernel_archive.gz', deleting them from the original 'linux-kernel' mailbox. If the 'linux-kernel_archive.gz' mailbox already exists, the newly archived messages are appended. Website: http://archivemail.sourceforge.net/ """ % \ (options.script_name, options.days_old_max, options.archive_suffix, options.script_name, options.days_old_max) args = options.parse_args(args, usage) if len(args) == 0: print usage sys.exit(1) options.sanity_check() for mailbox_path in args: archive(mailbox_path) ######## errors and debug ########## def vprint(string): """Print the string argument if we are in verbose mode""" if options.verbose: print string def unexpected_error(string): """Print the string argument, a 'shutting down' message and abort - this function never returns""" sys.stderr.write("%s: %s\n" % (options.script_name, string)) sys.stderr.write("%s: unexpected error encountered - shutting down\n" % options.script_name) sys.exit(1) def user_error(string): """Print the string argument and abort - this function never returns""" sys.stderr.write("%s: %s\n" % (options.script_name, string)) sys.exit(1) def user_warning(string): """Print the string argument""" sys.stderr.write("%s: Warning - %s\n" % (options.script_name, string)) ########### operations on a message ############ def make_mbox_from(message): """Return a string suitable for use as a 'From_' mbox header for the message. Arguments: message -- the rfc822 message object """ assert(message) address = guess_return_path(message) time_message = guess_delivery_time(message) gm_date = time.gmtime(time_message) assert(gm_date) date_string = time.asctime(gm_date) mbox_from = "From %s %s\n" % (address, date_string) return mbox_from def guess_return_path(message): """Return a guess at the Return Path address of an rfc822 message""" assert(message) for header in ('Return-path', 'From'): address_header = message.get('header') if address_header: (name, address) = rfc822.parseaddr(address_header) if address: return address # argh, we can't find any valid 'Return-path' guesses - just # just use the current unix username like mutt does login = pwd.getpwuid(os.getuid())[0] assert(login) return login def guess_delivery_time(message): """Return a guess at the delivery date of an rfc822 message""" assert(message) # try to guess the delivery date from various headers # get more desparate as we go through the array for header in ('Delivery-date', 'Date', 'Resent-Date'): try: date = message.getdate(header) if date: time_message = time.mktime(date) vprint("using valid time found from '%s' header" % header) return time_message except (IndexError, ValueError, OverflowError): pass # as a second-last resort, try the date from the 'From_' line (ugly) # this will only work from a mbox-format mailbox if (message.unixfrom): header = re.sub("From \S+", "", message.unixfrom) header = string.strip(header) date = rfc822.parsedate(header) if date: try: time_message = time.mktime(date) vprint("using valid time found from unix 'From_' header") return time_message except (ValueError, OverflowError): pass # the headers have no valid dates -- last resort, try the file timestamp # this will not work for mbox mailboxes try: file_name = message.fp.name except AttributeError: # we are looking at a 'mbox' mailbox - argh! # Just return the current time - this will never get archived :( vprint("no valid times found at all -- using current time!") return time.time() if not os.path.isfile(file_name): unexpected_error("mailbox file name '%s' has gone missing" % \ file_name) time_message = os.path.getmtime(message.fp.name) vprint("using valid time found from '%s' last-modification time" % \ file_name) return time_message def add_status_headers(message): """ Add Status and X-Status headers to a message from a maildir mailbox. Maildir messages store their information about being read/replied/etc in the suffix of the filename rather than in Status and X-Status headers in the message. In order to archive maildir messages into mbox format, it is nice to preserve this information by putting it into the status headers. """ status = "" x_status = "" match = re.search(":2,(.+)$", message.fp.name) if match: flags = match.group(1) for flag in flags: if flag == "D": # (draft): the user considers this message a draft pass # does this make any sense in mbox? elif flag == "F": # (flagged): user-defined 'important' flag x_status = x_status + "F" elif flag == "R": # (replied): the user has replied to this message x_status = x_status + "A" elif flag == "S": # (seen): the user has viewed this message status = status + "R" elif flag == "T": # (trashed): user has moved this message to trash pass # is this Status: D ? else: pass # no whingeing here, although it could be a good experiment # files in the maildir 'cur' directory are no longer new, # they are the same as messages with 'Status: O' headers in mbox (None, last_dir) = os.path.split(os.path.dirname(message.fp.name)) if last_dir == "cur": status = status + "O" # Maildir messages should not already have 'Status' and 'X-Status' # headers, although I have seen it done. If they do already have them, just # preserve them rather than trying to overwrite/verify them. if not message.get('Status') and status: vprint("converting maildir status into Status header '%s'" % status) message['Status'] = status if not message.get('X-Status') and x_status: vprint("converting maildir status into X-Status header '%s'" % x_status) message['X-Status'] = x_status def is_flagged(message): """return true if the message is flagged important, false otherwise""" # MH and mbox mailboxes use the 'X-Status' header to indicate importance x_status = message.get('X-Status') if x_status and re.search('F', x_status): vprint("message is important (X-Status header='%s')" % x_status) return 1 file_name = None try: file_name = message.fp.name except AttributeError: pass # maildir mailboxes use the filename suffix to indicate flagged status if file_name and re.search(":2,.*F.*$", file_name): vprint("message is important (filename info has 'F')") return 1 vprint("message is not flagged important") return 0 def is_unread(message): """return true if the message is unread, false otherwise""" # MH and mbox mailboxes use the 'Status' header to indicate read status status = message.get('Status') if status and re.search('R', status): vprint("message has been read (status header='%s')" % status) return 0 file_name = None try: file_name = message.fp.name except AttributeError: pass # maildir mailboxes use the filename suffix to indicate read status if file_name and re.search(":2,.*S.*$", file_name): vprint("message has been read (filename info has 'S')") return 0 vprint("message is unread") return 1 def is_smaller(message, size): """Return true if the message is smaller than size bytes, false otherwise""" assert(message) assert(size > 0) file_name = None message_size = None try: file_name = message.fp.name except AttributeError: pass if file_name: # with maildir and MH mailboxes, we can just use the file size message_size = os.path.getsize(file_name) else: # with mbox mailboxes, not so easy message_size = 0 if message.unixfrom: message_size = message_size + len(message.unixfrom) for header in message.headers: message_size = message_size + len(header) message_size = message_size + 1 # the blank line after the headers start_offset = message.fp.tell() message.fp.seek(0, 2) # seek to the end of the message end_offset = message.fp.tell() message.rewindbody() message_size = message_size + (end_offset - start_offset) if message_size < size: vprint("message is too small (%d bytes), minimum bytes : %d" % \ (message_size, size)) return 1 else: vprint("message is not too small (%d bytes), minimum bytes: %d" % \ (message_size, size)) return 0 def should_archive(message): """Return true if we should archive the message, false otherwise""" old = 0 time_message = guess_delivery_time(message) if options.date_old_max == None: old = is_older_than_days(time_message, options.days_old_max) else: old = is_older_than_time(time_message, options.date_old_max) # I could probably do this in one if statement, but then I wouldn't # understand it. if not old: return 0 if not options.include_flagged and is_flagged(message): return 0 if options.min_size and is_smaller(message, options.min_size): return 0 if options.preserve_unread and is_unread(message): return 0 return 1 def is_older_than_time(time_message, max_time): """Return true if a message is older than the specified time, false otherwise. Arguments: time_message -- the delivery date of the message measured in seconds since the epoch max_time -- maximum time allowed for message """ days_old = (max_time - time_message) / 24 / 60 / 60 if time_message < max_time: vprint("message is %.2f days older than the specified date" % days_old) return 1 vprint("message is %.2f days younger than the specified date" % \ abs(days_old)) return 0 def is_older_than_days(time_message, max_days): """Return true if a message is older than the specified number of days, false otherwise. Arguments: time_message -- the delivery date of the message measured in seconds since the epoch max_days -- maximum number of days before message is considered old """ assert(max_days >= 1) time_now = time.time() if time_message > time_now: vprint("warning: message has date in the future") return 0 secs_old_max = (max_days * 24 * 60 * 60) days_old = (time_now - time_message) / 24 / 60 / 60 vprint("message is %.2f days old" % days_old) if ((time_message + secs_old_max) < time_now): return 1 return 0 ############### mailbox operations ############### def archive(mailbox_name): """Archives a mailbox. Arguments: mailbox_name -- the filename/dirname of the mailbox to be archived final_archive_name -- the filename of the 'mbox' mailbox to archive old messages to - appending if the archive already exists """ assert(mailbox_name) # strip any trailing slash (we could be archiving a maildir or MH format # mailbox and somebody was pressing in bash) - we don't want to use # the trailing slash in the archive name mailbox_name = re.sub("/$", "", mailbox_name) assert(mailbox_name) set_signal_handlers() os.umask(077) # saves setting permissions on mailboxes/tempfiles # allow the user to embed time formats such as '%B' in the suffix string parsed_suffix = time.strftime(options.archive_suffix, time.localtime(time.time())) final_archive_name = mailbox_name + parsed_suffix if options.output_dir: final_archive_name = os.path.join(options.output_dir, os.path.basename(final_archive_name)) vprint("archiving '%s' to '%s' ..." % (mailbox_name, final_archive_name)) # create a temporary directory for us to work in securely old_temp_dir = tempfile.tempdir tempfile.tempdir = None new_temp_dir = tempfile.mktemp('archivemail') assert(new_temp_dir) os.mkdir(new_temp_dir) _stale.temp_dir = new_temp_dir tempfile.tempdir = new_temp_dir vprint("set tempfile directory to '%s'" % new_temp_dir) # check to see if we are running as root -- if so, change our effective # userid and groupid to that of the original mailbox if (os.getuid() == 0) and os.path.exists(mailbox_name): mailbox_user = os.stat(mailbox_name)[stat.ST_UID] mailbox_group = os.stat(mailbox_name)[stat.ST_GID] vprint("changing effective group id to: %d" % mailbox_group) os.setegid(mailbox_group) vprint("changing effective user id to: %d" % mailbox_user) os.seteuid(mailbox_user) if os.path.islink(mailbox_name): unexpected_error("'%s' is a symbolic link -- I feel nervous!" % mailbox_name) elif os.path.isfile(mailbox_name): vprint("guessing mailbox is of type: mbox") _archive_mbox(mailbox_name, final_archive_name) elif os.path.isdir(mailbox_name): cur_path = os.path.join(mailbox_name, "cur") new_path = os.path.join(mailbox_name, "new") if os.path.isdir(cur_path) and os.path.isdir(new_path): vprint("guessing mailbox is of type: maildir") _archive_dir(mailbox_name, final_archive_name, "maildir") else: vprint("guessing mailbox is of type: MH") _archive_dir(mailbox_name, final_archive_name, "mh") else: user_error("'%s': no such file or directory" % mailbox_name) # if we are running as root, revert the seteuid()/setegid() above if (os.getuid() == 0): vprint("changing effective groupid and userid back to root") os.setegid(0) os.seteuid(0) os.rmdir(new_temp_dir) _stale.temp_dir = None tempfile.tempdir = old_temp_dir def _archive_mbox(mailbox_name, final_archive_name): """Archive a 'mbox' style mailbox - used by archive_mailbox() Arguments: mailbox_name -- the filename/dirname of the mailbox to be archived final_archive_name -- the filename of the 'mbox' mailbox to archive old messages to - appending if the archive already exists """ assert(mailbox_name) assert(final_archive_name) archive = None retain = None stats = Stats(mailbox_name, final_archive_name) original = Mbox(path=mailbox_name) cache = IdentityCache(mailbox_name) original.procmail_lock() original.exclusive_lock() msg = original.next() if not msg and (original.starting_size > 0): user_error("'%s' is not a valid mbox-format mailbox" % mailbox_name) while (msg): stats.another_message() vprint("processing message '%s'" % msg.get('Message-ID')) if options.warn_duplicates: cache.warn_if_dupe(msg) if should_archive(msg): stats.another_archived() if options.delete_old_mail: vprint("decision: delete message") else: vprint("decision: archive message") if not options.dry_run: if (not archive): archive = ArchiveMbox(final_archive_name) archive.write(msg) else: vprint("decision: retain message") if not options.dry_run: if (not retain): retain = RetainMbox(mailbox_name) retain.write(msg) msg = original.next() vprint("finished reading messages") original.exclusive_unlock() original.close() if original.starting_size != original.get_size(): unexpected_error("the mailbox '%s' changed size during reading!" % \ mailbox_name) original.reset_stat() if not options.dry_run: if retain: retain.close() if archive: archive.close() if options.delete_old_mail: # we will never have an archive file if retain: retain.finalise() else: # nothing was retained - everything was deleted original.leave_empty() original.reset_stat() elif archive: archive.finalise() if retain: retain.finalise() else: # nothing was retained - everything was deleted original.leave_empty() original.reset_stat() else: # There was nothing to archive if retain: # retain will be the same as original mailbox retain.remove() original.procmail_unlock() if not options.quiet: stats.display() def _archive_dir(mailbox_name, final_archive_name, type): """Archive a 'maildir' or 'MH' style mailbox - used by archive_mailbox()""" assert(mailbox_name) assert(final_archive_name) assert(type) original = None archive = None stats = Stats(mailbox_name, final_archive_name) delete_queue = [] if type == "maildir": original = mailbox.Maildir(mailbox_name) elif type == "mh": original = mailbox.MHMailbox(mailbox_name) else: unexpected_error("unknown type: %s" % type) assert(original) cache = IdentityCache(mailbox_name) msg = original.next() while (msg): stats.another_message() vprint("processing message '%s'" % msg.get('Message-ID')) if options.warn_duplicates: cache.warn_if_dupe(msg) if should_archive(msg): stats.another_archived() if options.delete_old_mail: vprint("decision: delete message") else: vprint("decision: archive message") if not options.dry_run: if not archive: archive = ArchiveMbox(final_archive_name) if type == "maildir": add_status_headers(msg) archive.write(msg) if not options.dry_run: delete_queue.append(msg.fp.name) else: vprint("decision: retain message") msg = original.next() vprint("finished reading messages") if not options.dry_run: if archive: archive.close() archive.finalise() for file_name in delete_queue: if os.path.isfile(file_name): vprint("removing original message: '%s'" % file_name) os.remove(file_name) if not options.quiet: stats.display() ############### misc functions ############### def set_signal_handlers(): """set signal handlers to clean up temporary files on unexpected exit""" # Make sure we clean up nicely - we don't want to leave stale procmail # lockfiles about if something bad happens to us. This is quite # important, even though procmail will delete stale files after a while. atexit.register(clean_up) # delete stale files on exceptions/normal exit signal.signal(signal.SIGHUP, clean_up_signal) # signal 1 # SIGINT (signal 2) is handled as a python exception signal.signal(signal.SIGQUIT, clean_up_signal) # signal 3 signal.signal(signal.SIGTERM, clean_up_signal) # signal 15 def clean_up(): """Delete stale files -- to be registered with atexit.register()""" vprint("cleaning up ...") _stale.clean() def clean_up_signal(signal_number, stack_frame): """Delete stale files -- to be registered as a signal handler. Arguments: signal_number -- signal number of the terminating signal stack_frame -- the current stack frame """ # this will run the above clean_up(), since unexpected_error() # will abort with sys.exit() and clean_up will be registered # at this stage unexpected_error("received signal %s" % signal_number) def is_world_writable(path): """Return true if the path is world-writable, false otherwise""" assert(path) return (os.stat(path)[stat.ST_MODE] & stat.S_IWOTH) # this is where it all happens, folks if __name__ == '__main__': main()