NAME¶

nbdkit-ddrescue-filter - nbdkit filter for serving from ddrescue dump

SYNOPSIS¶

 nbdkit --filter=ddrescue plugin [plugin-args...]
                                 ddrescue-mapfile=file.map

 nbdkit --filter=ddrescue file file=file.img ddrescue-mapfile=file.map
                               [plugin-args...]

DESCRIPTION¶

"nbdkit-ddrescue-filter" is a filter for nbdkit(1) which overlays bad blocks according to a GNU ddrescue(1) mapfile. This is mainly useful for testing disk images recovered with ddrescue, to detect which files or filesystem structures are impacted, or attempting fsck on them.

Note that the current implementation is read-only.

EXAMPLES¶

Expose a rescued disk image with detected bad sectors:

 nbdkit --filter=ddrescue file file=disk.img ddrescue-mapfile=disk.map
    

The above command serves the disk image disk.img and maps the bad sectors listed in disk.img so that read attempts on them do not return a valid block full of zeroes.

PARAMETERS¶

The "ddrescue-mapfile" parameter must point to a valid GNU ddrescue mapfile.

DATA FORMAT¶

The file pointed to by the "ddrescue-mapfile" parameter should conform to the format of a GNU ddrescue(1) mapfile.

FILES¶

$filterdir/nbdkit-ddrescue-filter.so

The filter.

Use "nbdkit --dump-config" to find the location of $filterdir.

VERSION¶

"nbdkit-ddrescue-filter" first appeared in nbdkit 1.22.

SEE ALSO¶

nbdkit(1), nbdkit-file-plugin(1), nbdkit-filter(3), ddrescue(1), https://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html.

AUTHORS¶

François Revol

COPYRIGHT¶

Copyright (C) 2020 François Revol

LICENSE¶

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of Red Hat nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.