Showing content from http://svn.python.org/projects/python/branches/r22b1-branch/Demo/scripts/mkrcs.py below:
#! /usr/bin/env python # A rather specialized script to make sure that a symbolic link named # RCS exists pointing to a real RCS directory in a parallel tree # referenced as RCStree in an ancestor directory. # (I use this because I like my RCS files to reside on a physically # different machine). import os def main(): rcstree = 'RCStree' rcs = 'RCS' if os.path.islink(rcs): print `rcs`, 'is a symlink to', `os.readlink(rcs)` return if os.path.isdir(rcs): print `rcs`, 'is an ordinary directory' return if os.path.exists(rcs): print `rcs`, 'is a file?!?!' return # p = os.getcwd() up = '' down = '' # Invariants: # (1) join(p, down) is the current directory # (2) up is the same directory as p # Ergo: # (3) join(up, down) is the current directory #print 'p =', `p` while not os.path.isdir(os.path.join(p, rcstree)): head, tail = os.path.split(p) #print 'head =', `head`, '; tail =', `tail` if not tail: print 'Sorry, no ancestor dir contains', `rcstree` return p = head up = os.path.join(os.pardir, up) down = os.path.join(tail, down) #print 'p =', `p`, '; up =', `up`, '; down =', `down` there = os.path.join(up, rcstree) there = os.path.join(there, down) there = os.path.join(there, rcs) if os.path.isdir(there): print `there`, 'already exists' else: print 'making', `there` makedirs(there) print 'making symlink', `rcs`, '->', `there` os.symlink(there, rcs) def makedirs(p): if not os.path.isdir(p): head, tail = os.path.split(p) makedirs(head) os.mkdir(p, 0777) main()
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