EnglishFrenchSpanish

Ad


OnWorks favicon

bup-damage - Online in the Cloud

Run bup-damage in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command bup-damage that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


bup-damage - randomly destroy blocks of a file

SYNOPSIS


bup damage [-n count] [-s maxsize] [--percent pct] [-S seed] [--equal] <filenames...>

DESCRIPTION


Use bup damage to deliberately destroy blocks in a .pack or .idx file (from
.bup/objects/pack) to test the recovery features of bup-fsck(1) or other programs.

THIS PROGRAM IS EXTREMELY DANGEROUS AND WILL DESTROY YOUR DATA

bup damage is primarily useful for automated or manual tests of data recovery tools, to
reassure yourself that the tools actually work.

OPTIONS


-n, --num=numblocks
the number of separate blocks to damage in each file (default 10). Note that it's
possible for more than one damaged segment to fall in the same bup-fsck(1) recovery
block, so you might not damage as many recovery blocks as you expect. If this is a
problem, use --equal.

-s, --size=maxblocksize
the maximum size, in bytes, of each damaged block (default 1 unless --percent is
specified). Note that because of the way bup-fsck(1) works, a multi-byte block
could fall on the boundary between two recovery blocks, and thus damaging two
separate recovery blocks. In small files, it's also possible for a damaged block
to be larger than a recovery block. If these issues might be a problem, you should
use the default damage size of one byte.

--percent=maxblockpercent
the maximum size, in percent of the original file, of each damaged block. If both
--size and --percent are given, the maximum block size is the minimum of the two
restrictions. You can use this to ensure that a given block will never damage more
than one or two git-fsck(1) recovery blocks.

-S, --seed=randomseed
seed the random number generator with the given value. If you use this option,
your tests will be repeatable, since the damaged block offsets, sizes, and contents
will be the same every time. By default, the random numbers are different every
time (so you can run tests in a loop and repeatedly test with different damage each
time).

--equal
instead of choosing random offsets for each damaged block, space the blocks equally
throughout the file, starting at offset 0. If you also choose a correct maximum
block size, this can guarantee that any given damage block never damages more than
one git-fsck(1) recovery block. (This is also guaranteed if you use -s 1.)

EXAMPLES


# make a backup in case things go horribly wrong
cp -pPR ~/.bup/objects/pack ~/bup-packs.bak

# generate recovery blocks for all packs
bup fsck -g

# deliberately damage the packs
bup damage -n 10 -s 1 -S 0 ~/.bup/objects/pack/*.{pack,idx}

# recover from the damage
bup fsck -r

Use bup-damage online using onworks.net services


Free Servers & Workstations

Download Windows & Linux apps

  • 1
    SAGA GIS
    SAGA GIS
    SAGA - System for Automated
    Geoscientific Analyses - is a Geographic
    Information System (GIS) software with
    immense capabilities for geodata
    processing and ana...
    Download SAGA GIS
  • 2
    Toolbox for Java/JTOpen
    Toolbox for Java/JTOpen
    The IBM Toolbox for Java / JTOpen is a
    library of Java classes supporting the
    client/server and internet programming
    models to a system running OS/400,
    i5/OS, o...
    Download Toolbox for Java/JTOpen
  • 3
    D3.js
    D3.js
    D3.js (or D3 for Data-Driven Documents)
    is a JavaScript library that allows you
    to produce dynamic, interactive data
    visualizations in web browsers. With D3
    you...
    Download D3.js
  • 4
    Shadowsocks
    Shadowsocks
    A fast tunnel proxy that helps you
    bypass firewalls This is an application
    that can also be fetched from
    https://sourceforge.net/projects/shadowsocksgui/.
    It ha...
    Download Shadowsocks
  • 5
    GLPI Themes
    GLPI Themes
    Download release at
    https://github.com/stdonato/glpi-modifications/
    Color themes for GLPI 0.84 and 0.85 New
    Modifications for GLPI This is an
    application that c...
    Download GLPI Themes
  • 6
    SMPlayer
    SMPlayer
    SMPlayer is a free media player for
    Windows and Linux with built-in codecs
    that can also play YouTube videos. One
    of the most interesting features of
    SMPlayer:...
    Download SMPlayer
  • More »

Linux commands

Ad