#! /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())