mkrcs.py :  » Mobile » Python-for-PalmOS » Python-1.5.2+reduced-1.0 » Demo » scripts » Python Open Source

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Python Open Source » Mobile » Python for PalmOS 
Python for PalmOS » Python 1.5.2 reduced 1.0 » Demo » scripts » mkrcs.py
#! /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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