3 # https://sourceware.org/bugzilla/show_bug.cgi?id=26034
4 export "BUP_ARGV_0"="$0"
7 export "BUP_ARGV_${arg_i}"="$arg"
11 # Here to end of preamble replaced during install
12 bup_python="$(dirname "$0")/../../config/bin/python" || exit $?
13 exec "$bup_python" "$0"
17 from __future__ import absolute_import
18 import os, random, sys
20 sys.path[:0] = [os.path.dirname(os.path.realpath(__file__)) + '/..']
22 from bup import compat, options
23 from bup.compat import argv_bytes, bytes_from_uint, range
24 from bup.helpers import log
25 from bup.io import path_msg
29 return b''.join(bytes_from_uint(random.randrange(0,256)) for i in range(n))
33 bup damage [-n count] [-s maxsize] [-S seed] <filenames...>
35 WARNING: THIS COMMAND IS EXTREMELY DANGEROUS
36 n,num= number of blocks to damage
37 s,size= maximum size of each damaged block
38 percent= maximum size of each damaged block (as a percent of entire file)
39 equal spread damage evenly throughout the file
40 S,seed= random number seed (for repeatable tests)
42 o = options.Options(optspec)
43 opt, flags, extra = o.parse(compat.argv[1:])
46 o.fatal('filenames expected')
52 name = argv_bytes(name)
53 log('Damaging "%s"...\n' % path_msg(name))
54 with open(name, 'r+b') as f:
55 st = os.fstat(f.fileno())
57 if opt.percent or opt.size:
58 ms1 = int(float(opt.percent or 0)/100.0*size) or size
59 ms2 = opt.size or size
60 maxsize = min(ms1, ms2)
63 chunks = opt.num or 10
64 chunksize = size // chunks
65 for r in range(chunks):
66 sz = random.randrange(1, maxsize+1)
72 ofs = random.randrange(0, size - sz + 1)
73 log(' %6d bytes at %d\n' % (sz, ofs))
75 f.write(randblock(sz))