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Make a copy of a directory tree with symbolic links to all files in the original tree

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'''

PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
--------------------------------------------

1. This LICENSE AGREEMENT is between the Python Software Foundation
('PSF'), and the Individual or Organization ('Licensee') accessing and
otherwise using this software ('Python') in source or binary form and
its associated documentation.

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license to reproduce, analyze, test, perform and/or display publicly,
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License Agreement and PSF's notice of copyright, i.e., 'Copyright (c)
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are retained in Python alone or in any derivative version prepared
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'''
#! /usr/bin/env python

# linktree
#
# Make a copy of a directory tree with symbolic links to all files in the
# original tree.
# All symbolic links go to a special symbolic link at the top, so you
# can easily fix things if the original source tree moves.
# See also 'mkreal'.
#
# usage: mklinks oldtree newtree

import sys, os

LINK = '.LINK' # Name of special symlink at the top.

debug = 0

def main():
    if not 3 <= len(sys.argv) <= 4:
        print 'usage:', sys.argv[0], 'oldtree newtree [linkto]'
        return 2
    oldtree, newtree = sys.argv[1], sys.argv[2]
    if len(sys.argv) > 3:
        link = sys.argv[3]
        link_may_fail = 1
    else:
        link = LINK
        link_may_fail = 0
    if not os.path.isdir(oldtree):
        print oldtree + ': not a directory'
        return 1
    try:
        os.mkdir(newtree, 0777)
    except os.error, msg:
        print newtree + ': cannot mkdir:', msg
        return 1
    linkname = os.path.join(newtree, link)
    try:
        os.symlink(os.path.join(os.pardir, oldtree), linkname)
    except os.error, msg:
        if not link_may_fail:
            print linkname + ': cannot symlink:', msg
            return 1
        else:
            print linkname + ': warning: cannot symlink:', msg
    linknames(oldtree, newtree, link)
    return 0

def linknames(old, new, link):
    if debug: print 'linknames', (old, new, link)
    try:
        names = os.listdir(old)
    except os.error, msg:
        print old + ': warning: cannot listdir:', msg
        return
    for name in names:
        if name not in (os.curdir, os.pardir):
            oldname = os.path.join(old, name)
            linkname = os.path.join(link, name)
            newname = os.path.join(new, name)
            if debug > 1: print oldname, newname, linkname
            if os.path.isdir(oldname) and \
               not os.path.islink(oldname):
                try:
                    os.mkdir(newname, 0777)
                    ok = 1
                except:
                    print newname + \
                          ': warning: cannot mkdir:', msg
                    ok = 0
                if ok:
                    linkname = os.path.join(os.pardir,
                                            linkname)
                    linknames(oldname, newname, linkname)
            else:
                os.symlink(linkname, newname)

if __name__ == '__main__':
    sys.exit(main())

标签:Python,Utility

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