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#!/usr/bin/env python
import sys, os, random
from bup import options
from bup.helpers import *
def randblock(n):
l = []
for i in xrange(n):
l.append(chr(random.randrange(0,256)))
return ''.join(l)
optspec = """
bup damage [-n count] [-s maxsize] [-S seed] <filenames...>
--
WARNING: THIS COMMAND IS EXTREMELY DANGEROUS
n,num= number of blocks to damage
s,size= maximum size of each damaged block
percent= maximum size of each damaged block (as a percent of entire file)
equal spread damage evenly throughout the file
S,seed= random number seed (for repeatable tests)
"""
o = options.Options('bup damage', optspec)
(opt, flags, extra) = o.parse(sys.argv[1:])
if not extra:
o.fatal('filenames expected')
if opt.seed != None:
random.seed(opt.seed)
for name in extra:
log('Damaging "%s"...\n' % name)
f = open(name, 'r+b')
st = os.fstat(f.fileno())
size = st.st_size
if opt.percent or opt.size:
ms1 = int(float(opt.percent or 0)/100.0*size) or size
ms2 = opt.size or size
maxsize = min(ms1, ms2)
else:
maxsize = 1
chunks = opt.num or 10
chunksize = size/chunks
for r in range(chunks):
sz = random.randrange(1, maxsize+1)
if sz > size:
sz = size
if opt.equal:
ofs = r*chunksize
else:
ofs = random.randrange(0, size - sz + 1)
log(' %6d bytes at %d\n' % (sz, ofs))
f.seek(ofs)
f.write(randblock(sz))
f.close()
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