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rsync 3.2.3

    1: #!/usr/bin/env python3
    2: 
    3: # This implements a simple protocol to do user & group conversions between
    4: # names & ids.  All input and output consists of simple strings with a
    5: # terminating newline.
    6: #
    7: # The requests can be:
    8: #
    9: #   uid ID_NUM\n  ->  NAME\n
   10: #   gid ID_NUM\n  ->  NAME\n
   11: #   usr NAME\n    ->  ID_NUM\n
   12: #   grp NAME\n    ->  ID_NUM\n
   13: #
   14: # An unknown ID_NUM or NAME results in an empty return value.
   15: #
   16: # This is used by an rsync daemon when configured with the "name converter" and
   17: # (often) "use chroot = true".  While this converter uses real user & group
   18: # lookups you could change it to use any mapping idiom you'd like.
   19: 
   20: import sys, argparse, pwd, grp
   21: 
   22: def main():
   23:     for line in sys.stdin:
   24:         try:
   25:             req, arg = line.rstrip().split(' ', 1)
   26:         except:
   27:             req = None
   28:         try:
   29:             if req == 'uid':
   30:                 ans = pwd.getpwuid(int(arg)).pw_name
   31:             elif req == 'gid':
   32:                 ans = grp.getgrgid(int(arg)).gr_name
   33:             elif req == 'usr':
   34:                 ans = pwd.getpwnam(arg).pw_uid
   35:             elif req == 'grp':
   36:                 ans = grp.getgrnam(arg).gr_gid
   37:             else:
   38:                 print("Invalid request", file=sys.stderr)
   39:                 sys.exit(1)
   40:         except KeyError:
   41:             ans = ''
   42:         print(ans, flush=True)
   43: 
   44: 
   45: if __name__ == '__main__':
   46:     parser = argparse.ArgumentParser(description="Convert users & groups between names & numbers for an rsync daemon.")
   47:     args = parser.parse_args()
   48:     main()
   49: 
   50: # vim: sw=4 et