NAME

       nbdkit-gzip-filter - decompress a .gz file

SYNOPSIS

        nbdkit file --filter=gzip FILENAME.gz

DESCRIPTION

       "nbdkit-gzip-filter" is a filter for nbdkit(1) which transparently decompresses a gzip-compressed file.
       You can place this filter on top of nbdkit-file-plugin(1) to decompress a local .gz file, or on top of
       other plugins such as nbdkit-curl-plugin(1):

        nbdkit curl --filter=gzip https://example.com/disk.gz

       With nbdkit-tar-filter(1) it can be used to extract files from a compressed tar file:

        nbdkit curl --filter=tar --filter=gzip \
               https://example.com/file.tar.gz tar-entry=disk.img

       The filter only allows read-only connections.

       Note that gzip files are not very good for random access in large files because seeking to a position in
       the gzip file involves decompressing all data before that point in the file.  A more practical method to
       compress large disk images is to use the xz(1) format and nbdkit-xz-filter(1).

       To allow seeking this filter has to keep the contents of the complete uncompressed file, which it does in
       a hidden temporary file under $TMPDIR.

PARAMETERS

       There are no parameters specific to this plugin.

ENVIRONMENT VARIABLES

       "TMPDIR"
           Because  the  gzip  format  is  not  seekable,  this filter has to store the complete contents of the
           compressed file in a temporary file located in /var/tmp by default.  You can override  this  location
           by setting the "TMPDIR" environment variable before starting nbdkit.

FILES

       $filterdir/nbdkit-gzip-filter.so
           The plugin.

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

VERSION

       "nbdkit-gzip-filter"  first appeared in nbdkit 1.22.  It is derived from "nbdkit-gzip-plugin" which first
       appeared in nbdkit 1.0.

SEE ALSO

       nbdkit-curl-plugin(1),  nbdkit-file-plugin(1),  nbdkit-tar-filter(1),   nbdkit-xz-filter(1),   nbdkit(1),
       nbdkit-plugin(3).

AUTHORS

       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-1.36.3                                      2024-03-31                              nbdkit-gzip-filter(1)