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406 lines
13 KiB
Python
Executable File
406 lines
13 KiB
Python
Executable File
#! /usr/bin/env python3
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"""Mirror a remote ftp subtree into a local directory tree.
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usage: ftpmirror [-v] [-q] [-i] [-m] [-n] [-r] [-s pat]
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[-l username [-p passwd [-a account]]]
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hostname[:port] [remotedir [localdir]]
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-v: verbose
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-q: quiet
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-i: interactive mode
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-m: macintosh server (NCSA telnet 2.4) (implies -n -s '*.o')
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-n: don't log in
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-r: remove local files/directories no longer pertinent
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-l username [-p passwd [-a account]]: login info (default .netrc or anonymous)
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-s pat: skip files matching pattern
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hostname: remote host w/ optional port separated by ':'
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remotedir: remote directory (default initial)
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localdir: local directory (default current)
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"""
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import os
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import sys
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import time
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import getopt
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import ftplib
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import netrc
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from fnmatch import fnmatch
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# Print usage message and exit
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def usage(*args):
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sys.stdout = sys.stderr
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for msg in args: print(msg)
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print(__doc__)
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sys.exit(2)
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verbose = 1 # 0 for -q, 2 for -v
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interactive = 0
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mac = 0
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rmok = 0
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nologin = 0
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skippats = ['.', '..', '.mirrorinfo']
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# Main program: parse command line and start processing
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def main():
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global verbose, interactive, mac, rmok, nologin
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'a:bil:mnp:qrs:v')
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except getopt.error as msg:
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usage(msg)
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login = ''
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passwd = ''
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account = ''
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if not args: usage('hostname missing')
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host = args[0]
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port = 0
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if ':' in host:
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host, port = host.split(':', 1)
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port = int(port)
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try:
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auth = netrc.netrc().authenticators(host)
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if auth is not None:
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login, account, passwd = auth
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except (netrc.NetrcParseError, IOError):
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pass
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for o, a in opts:
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if o == '-l': login = a
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if o == '-p': passwd = a
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if o == '-a': account = a
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if o == '-v': verbose = verbose + 1
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if o == '-q': verbose = 0
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if o == '-i': interactive = 1
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if o == '-m': mac = 1; nologin = 1; skippats.append('*.o')
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if o == '-n': nologin = 1
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if o == '-r': rmok = 1
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if o == '-s': skippats.append(a)
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remotedir = ''
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localdir = ''
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if args[1:]:
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remotedir = args[1]
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if args[2:]:
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localdir = args[2]
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if args[3:]: usage('too many arguments')
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#
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f = ftplib.FTP()
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if verbose: print("Connecting to '%s%s'..." % (host,
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(port and ":%d"%port or "")))
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f.connect(host,port)
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if not nologin:
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if verbose:
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print('Logging in as %r...' % (login or 'anonymous'))
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f.login(login, passwd, account)
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if verbose: print('OK.')
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pwd = f.pwd()
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if verbose > 1: print('PWD =', repr(pwd))
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if remotedir:
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if verbose > 1: print('cwd(%s)' % repr(remotedir))
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f.cwd(remotedir)
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if verbose > 1: print('OK.')
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pwd = f.pwd()
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if verbose > 1: print('PWD =', repr(pwd))
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#
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mirrorsubdir(f, localdir)
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# Core logic: mirror one subdirectory (recursively)
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def mirrorsubdir(f, localdir):
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pwd = f.pwd()
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if localdir and not os.path.isdir(localdir):
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if verbose: print('Creating local directory', repr(localdir))
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try:
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makedir(localdir)
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except OSError as msg:
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print("Failed to establish local directory", repr(localdir))
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return
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infofilename = os.path.join(localdir, '.mirrorinfo')
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try:
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text = open(infofilename, 'r').read()
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except IOError as msg:
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text = '{}'
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try:
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info = eval(text)
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except (SyntaxError, NameError):
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print('Bad mirror info in', repr(infofilename))
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info = {}
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subdirs = []
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listing = []
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if verbose: print('Listing remote directory %r...' % (pwd,))
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f.retrlines('LIST', listing.append)
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filesfound = []
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for line in listing:
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if verbose > 1: print('-->', repr(line))
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if mac:
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# Mac listing has just filenames;
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# trailing / means subdirectory
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filename = line.strip()
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mode = '-'
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if filename[-1:] == '/':
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filename = filename[:-1]
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mode = 'd'
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infostuff = ''
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else:
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# Parse, assuming a UNIX listing
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words = line.split(None, 8)
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if len(words) < 6:
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if verbose > 1: print('Skipping short line')
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continue
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filename = words[-1].lstrip()
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i = filename.find(" -> ")
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if i >= 0:
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# words[0] had better start with 'l'...
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if verbose > 1:
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print('Found symbolic link %r' % (filename,))
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linkto = filename[i+4:]
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filename = filename[:i]
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infostuff = words[-5:-1]
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mode = words[0]
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skip = 0
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for pat in skippats:
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if fnmatch(filename, pat):
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if verbose > 1:
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print('Skip pattern', repr(pat), end=' ')
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print('matches', repr(filename))
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skip = 1
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break
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if skip:
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continue
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if mode[0] == 'd':
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if verbose > 1:
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print('Remembering subdirectory', repr(filename))
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subdirs.append(filename)
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continue
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filesfound.append(filename)
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if filename in info and info[filename] == infostuff:
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if verbose > 1:
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print('Already have this version of',repr(filename))
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continue
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fullname = os.path.join(localdir, filename)
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tempname = os.path.join(localdir, '@'+filename)
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if interactive:
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doit = askabout('file', filename, pwd)
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if not doit:
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if filename not in info:
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info[filename] = 'Not retrieved'
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continue
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try:
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os.unlink(tempname)
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except OSError:
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pass
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if mode[0] == 'l':
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if verbose:
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print("Creating symlink %r -> %r" % (filename, linkto))
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try:
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os.symlink(linkto, tempname)
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except IOError as msg:
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print("Can't create %r: %s" % (tempname, msg))
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continue
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else:
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try:
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fp = open(tempname, 'wb')
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except IOError as msg:
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print("Can't create %r: %s" % (tempname, msg))
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continue
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if verbose:
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print('Retrieving %r from %r as %r...' % (filename, pwd, fullname))
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if verbose:
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fp1 = LoggingFile(fp, 1024, sys.stdout)
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else:
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fp1 = fp
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t0 = time.time()
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try:
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f.retrbinary('RETR ' + filename,
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fp1.write, 8*1024)
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except ftplib.error_perm as msg:
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print(msg)
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t1 = time.time()
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bytes = fp.tell()
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fp.close()
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if fp1 != fp:
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fp1.close()
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try:
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os.unlink(fullname)
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except OSError:
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pass # Ignore the error
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try:
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os.rename(tempname, fullname)
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except OSError as msg:
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print("Can't rename %r to %r: %s" % (tempname, fullname, msg))
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continue
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info[filename] = infostuff
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writedict(info, infofilename)
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if verbose and mode[0] != 'l':
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dt = t1 - t0
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kbytes = bytes / 1024.0
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print(int(round(kbytes)), end=' ')
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print('Kbytes in', end=' ')
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print(int(round(dt)), end=' ')
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print('seconds', end=' ')
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if t1 > t0:
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print('(~%d Kbytes/sec)' % \
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int(round(kbytes/dt),))
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print()
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#
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# Remove files from info that are no longer remote
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deletions = 0
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for filename in list(info.keys()):
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if filename not in filesfound:
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if verbose:
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print("Removing obsolete info entry for", end=' ')
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print(repr(filename), "in", repr(localdir or "."))
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del info[filename]
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deletions = deletions + 1
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if deletions:
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writedict(info, infofilename)
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#
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# Remove local files that are no longer in the remote directory
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try:
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if not localdir: names = os.listdir(os.curdir)
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else: names = os.listdir(localdir)
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except OSError:
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names = []
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for name in names:
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if name[0] == '.' or name in info or name in subdirs:
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continue
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skip = 0
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for pat in skippats:
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if fnmatch(name, pat):
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if verbose > 1:
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print('Skip pattern', repr(pat), end=' ')
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print('matches', repr(name))
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skip = 1
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break
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if skip:
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continue
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fullname = os.path.join(localdir, name)
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if not rmok:
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if verbose:
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print('Local file', repr(fullname), end=' ')
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print('is no longer pertinent')
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continue
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if verbose: print('Removing local file/dir', repr(fullname))
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remove(fullname)
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#
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# Recursively mirror subdirectories
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for subdir in subdirs:
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if interactive:
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doit = askabout('subdirectory', subdir, pwd)
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if not doit: continue
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if verbose: print('Processing subdirectory', repr(subdir))
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localsubdir = os.path.join(localdir, subdir)
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pwd = f.pwd()
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if verbose > 1:
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print('Remote directory now:', repr(pwd))
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print('Remote cwd', repr(subdir))
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try:
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f.cwd(subdir)
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except ftplib.error_perm as msg:
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print("Can't chdir to", repr(subdir), ":", repr(msg))
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else:
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if verbose: print('Mirroring as', repr(localsubdir))
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mirrorsubdir(f, localsubdir)
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if verbose > 1: print('Remote cwd ..')
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f.cwd('..')
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newpwd = f.pwd()
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if newpwd != pwd:
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print('Ended up in wrong directory after cd + cd ..')
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print('Giving up now.')
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break
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else:
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if verbose > 1: print('OK.')
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# Helper to remove a file or directory tree
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def remove(fullname):
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if os.path.isdir(fullname) and not os.path.islink(fullname):
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try:
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names = os.listdir(fullname)
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except OSError:
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names = []
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ok = 1
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for name in names:
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if not remove(os.path.join(fullname, name)):
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ok = 0
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if not ok:
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return 0
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try:
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os.rmdir(fullname)
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except OSError as msg:
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print("Can't remove local directory %r: %s" % (fullname, msg))
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return 0
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else:
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try:
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os.unlink(fullname)
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except OSError as msg:
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print("Can't remove local file %r: %s" % (fullname, msg))
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return 0
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return 1
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# Wrapper around a file for writing to write a hash sign every block.
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class LoggingFile:
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def __init__(self, fp, blocksize, outfp):
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self.fp = fp
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self.bytes = 0
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self.hashes = 0
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self.blocksize = blocksize
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self.outfp = outfp
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def write(self, data):
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self.bytes = self.bytes + len(data)
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hashes = int(self.bytes) / self.blocksize
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while hashes > self.hashes:
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self.outfp.write('#')
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self.outfp.flush()
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self.hashes = self.hashes + 1
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self.fp.write(data)
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def close(self):
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self.outfp.write('\n')
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def raw_input(prompt):
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sys.stdout.write(prompt)
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sys.stdout.flush()
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return sys.stdin.readline()
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# Ask permission to download a file.
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def askabout(filetype, filename, pwd):
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prompt = 'Retrieve %s %s from %s ? [ny] ' % (filetype, filename, pwd)
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while 1:
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reply = raw_input(prompt).strip().lower()
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if reply in ['y', 'ye', 'yes']:
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return 1
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if reply in ['', 'n', 'no', 'nop', 'nope']:
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return 0
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print('Please answer yes or no.')
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# Create a directory if it doesn't exist. Recursively create the
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# parent directory as well if needed.
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def makedir(pathname):
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if os.path.isdir(pathname):
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return
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dirname = os.path.dirname(pathname)
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if dirname: makedir(dirname)
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os.mkdir(pathname, 0o777)
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# Write a dictionary to a file in a way that can be read back using
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# rval() but is still somewhat readable (i.e. not a single long line).
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# Also creates a backup file.
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def writedict(dict, filename):
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dir, fname = os.path.split(filename)
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tempname = os.path.join(dir, '@' + fname)
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backup = os.path.join(dir, fname + '~')
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try:
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os.unlink(backup)
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except OSError:
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pass
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fp = open(tempname, 'w')
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fp.write('{\n')
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for key, value in dict.items():
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fp.write('%r: %r,\n' % (key, value))
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fp.write('}\n')
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fp.close()
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try:
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os.rename(filename, backup)
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except OSError:
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pass
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os.rename(tempname, filename)
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if __name__ == '__main__':
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main()
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