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 # Use lstat() to stat files if it exists, else stat()
  13 try:
  14     statfunc = os.lstat
  15 except AttributeError:
  16     statfunc = os.stat
  17
  18 # Parse options
  19 if sys.argv[1] == '-m':
  20     itime = ST_MTIME
  21     del sys.argv[1]
  22 elif sys.argv[1] == '-c':
  23     itime = ST_CTIME
  24     del sys.argv[1]
  25 elif sys.argv[1] == '-a':
  26     itime = ST_CTIME
  27     del sys.argv[1]
  28 else:
  29     itime = ST_MTIME
  30
  31 secs_per_year = 365.0 * 24.0 * 3600.0   # Scale factor
  32 now = time.time()                       # Current time, for age computations
  33 status = 0                              # Exit status, set to 1 on errors
  34
  35 # Compute max file name length
  36 maxlen = 1
  37 for file in sys.argv[1:]:
  38     if len(file) > maxlen: maxlen = len(file)
  39
  40 # Process each argument in turn
  41 for file in sys.argv[1:]:
  42     try:
  43         st = statfunc(file)
  44     except os.error, msg:
  45         sys.stderr.write('can\'t stat ' + `file` + ': ' + `msg` + '\n')
  46         status = 1
  47         st = ()
  48     if st:
  49         anytime = st[itime]
  50         size = st[ST_SIZE]
  51         age = now - anytime
  52         byteyears = float(size) * float(age) / secs_per_year
  53         print file.ljust(maxlen),
  54         print repr(int(byteyears)).rjust(8)
  55
  56 sys.exit(status)