Provided by: nbdkit_1.42.2-1ubuntu1_amd64 bug

NAME
       nbdkit-offset-filter - nbdkit offset filter


SYNOPSIS
        nbdkit --filter=offset plugin offset=OFFSET range=LENGTH [plugin-args...]


DESCRIPTION
       "nbdkit-offset-filter" is a filter that limits requests to the byte range "[offset .. offset+range-1]"
       within another plugin.


PARAMETERS
       offset=OFFSET
           The start offset.  The offset must be ≥ 0.

           This parameter is optional.  If not given then "offset=0" is assumed.

       range=LENGTH
           The length of data to serve.

           This  parameter  is optional.  If not given then the range is served starting from the offset through
           to the end of the underlying file/device.

       Note it is an error if the offset and/or range specify data which lies beyond the end of  the  underlying
       device.  Use nbdkit-truncate-filter(1) to truncate or extend the size of plugins.


EXAMPLES
   Serve part of a file
       Using  nbdkit-file-plugin(1), serve the file "disk.img" starting at offset "1M".  The total length served
       is "100M" (the underlying file must therefore be at least "101M" in length):

        nbdkit --filter=offset file disk.img offset=1M range=100M

   Serve a single partition
       An easier way to do this is with nbdkit-partition-filter(1).

       One way to serve a single partition from a disk is to find the start and  length  of  the  partition,  eg
       using:

        $ parted disk.img -- unit b print
        ...
        Number  Start   End         Size        Type     File system  Flags
         1      65536B  104792575B  104727040B  primary  ext2

       You can then serve the partition only using:

        nbdkit --filter=offset file disk.img offset=65536 range=104727040


FILES
       $filterdir/nbdkit-offset-filter.so
           The filter.

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


VERSION
       "nbdkit-offset-filter" first appeared in nbdkit 1.2.


SEE ALSO
       nbdkit(1), nbdkit-file-plugin(1), nbdkit-filter(3), nbdkit-partition-filter(1), nbdkit-protect-filter(1),
       nbdkit-tar-filter(1), nbdkit-truncate-filter(1).


AUTHORS
       Eric Blake

       Richard W.M. Jones


COPYRIGHT
       Copyright Red Hat


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.

nbdkit-1.42.2                                      2025-04-02                            nbdkit-offset-filter(1)