Provided by: nbdkit_1.34.4-1ubuntu1_amd64 bug

NAME

       nbdkit-pattern-plugin - plugin to serve a fixed pattern of data for testing

SYNOPSIS

        nbdkit pattern [size=]SIZE

DESCRIPTION

       "nbdkit-pattern-plugin" is a plugin for nbdkit(1) which serves a fixed pattern of data,
       read only.  This is used for testing nbdkit filters and NBD clients.  To create test disks
       filled with other repeated patterns use nbdkit-data-plugin(1) instead.

       The fixed pattern is the offset, as a 64 bit big endian integer, every 8 bytes.  In
       hexadecimal this looks like:

        offset                         data
         0000:   00 00 00 00 00 00 00 00   00 00 00 00 00 00 00 08
         0010:   00 00 00 00 00 00 00 10   00 00 00 00 00 00 00 18
         0020:   00 00 00 00 00 00 00 20   00 00 00 00 00 00 00 28
                                         ↗ └──────────┬──────────┘
                     byte at offset 0x28              │
                                                      │
                                            64 bit big endian int
                                            encoding offset 0x28

       The size of the virtual disk must be specified using the "size" parameter.  If the size is
       not a multiple of 8 then the last 8 byte offset in the pattern is truncated.

   Largest possible size
       nbdkit itself limits plugins to 2⁶³-1 bytes (decimal: 9223372036854775807,
       hexadecimal: 0x7fff_ffff_ffff_ffff).

       To test if NBD clients are free of bugs (not to mention nbdkit itself) you can use:

        nbdkit pattern 9223372036854775807

       Note this is too large for qemu to open.

   Little endian pattern
       To get a little endian pattern instead of big endian apply nbdkit-swab-filter(1) on top of
       this plugin:

        nbdkit pattern 1G --filter=swab swab-bits=64

PARAMETERS

       [size=]SIZE
           Specify the virtual size of the disk image.

           This parameter is required.

           "size=" is a magic config key and may be omitted in most cases.  See "Magic
           parameters" in nbdkit(1).

FILES

       $plugindir/nbdkit-pattern-plugin.so
           The plugin.

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

VERSION

       "nbdkit-pattern-plugin" first appeared in nbdkit 1.6.

SEE ALSO

       nbdkit(1), nbdkit-plugin(3), nbdkit-data-plugin(1), nbdkit-full-plugin(1),
       nbdkit-null-plugin(1), nbdkit-offset-filter(1), nbdkit-random-plugin(1),
       nbdkit-sparse-random-plugin(1), nbdkit-swab-filter(1), nbdkit-zero-plugin(1).

AUTHORS

       Richard W.M. Jones

COPYRIGHT

       Copyright Red Hat

LICENSE

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       permitted provided that the following conditions are met:

       •   Redistributions of source code must retain the above copyright notice, this list of
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           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.

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