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 import string
  11 from stat import *
  12
  13 # Use lstat() to stat files if it exists, else stat()
  14 try:
  15         statfunc = os.lstat
  16 except AttributeError:
  17         statfunc = os.stat
  18
  19 # Parse options
  20 if sys.argv[1] == '-m':
  21         itime = ST_MTIME
  22         del sys.argv[1]
  23 elif sys.argv[1] == '-c':
  24         itime = ST_CTIME
  25         del sys.argv[1]
  26 elif sys.argv[1] == '-a':
  27         itime = ST_CTIME
  28         del sys.argv[1]
  29 else:
  30         itime = ST_MTIME
  31
  32 secs_per_year = 365.0 * 24.0 * 3600.0   # Scale factor
  33 now = time.time()                       # Current time, for age computations
  34 status = 0                              # Exit status, set to 1 on errors
  35
  36 # Compute max file name length
  37 maxlen = 1
  38 for file in sys.argv[1:]:
  39         if len(file) > maxlen: maxlen = len(file)
  40
  41 # Process each argument in turn
  42 for file in sys.argv[1:]:
  43         try:
  44                 st = statfunc(file)
  45         except os.error, msg:
  46                 sys.stderr.write('can\'t stat ' + `file` + ': ' + `msg` + '\n')
  47                 status = 1
  48                 st = ()
  49         if st:
  50                 anytime = st[itime]
  51                 size = st[ST_SIZE]
  52                 age = now - anytime
  53                 byteyears = float(size) * float(age) / secs_per_year
  54                 print string.ljust(file, maxlen),
  55                 print string.rjust(`int(byteyears)`, 8)
  56
  57 sys.exit(status)