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
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