Tools/scripts/byteyears.py

   1 #! /usr/bin/env python
   2
   3 # Print the product of age and size of each file, in suitable units.
   4 #
   5 # Usage: byteyears [ -a | -m | -c ] file ...
   6 #
   7 # Options -[amc] select atime, mtime (default) or ctime as age.
   8
   9 import sys, os, time
  10 from stat import *
  11
  12 def main():
  13
  14     # Use lstat() to stat files if it exists, else stat()
  15     try:
  16         statfunc = os.lstat
  17     except AttributeError:
  18         statfunc = os.stat
  19
  20     # Parse options
  21     if sys.argv[1] == '-m':
  22         itime = ST_MTIME
  23         del sys.argv[1]
  24     elif sys.argv[1] == '-c':
  25         itime = ST_CTIME
  26         del sys.argv[1]
  27     elif sys.argv[1] == '-a':
  28         itime = ST_CTIME
  29         del sys.argv[1]
  30     else:
  31         itime = ST_MTIME
  32
  33     secs_per_year = 365.0 * 24.0 * 3600.0   # Scale factor
  34     now = time.time()                       # Current time, for age computations
  35     status = 0                              # Exit status, set to 1 on errors
  36
  37     # Compute max file name length
  38     maxlen = 1
  39     for filename in sys.argv[1:]:
  40         maxlen = max(maxlen, len(filename))
  41
  42     # Process each argument in turn
  43     for filename in sys.argv[1:]:
  44         try:
  45             st = statfunc(filename)
  46         except os.error, msg:
  47             sys.stderr.write("can't stat %r: %r\n" % (filename, msg))
  48             status = 1
  49             st = ()
  50         if st:
  51             anytime = st[itime]
  52             size = st[ST_SIZE]
  53             age = now - anytime
  54             byteyears = float(size) * float(age) / secs_per_year
  55             print filename.ljust(maxlen),
  56             print repr(int(byteyears)).rjust(8)
  57
  58     sys.exit(status)
  59
  60 if __name__ == '__main__':
  61     main()