NAME

       nbdkit-release-notes-1.20 - release notes for nbdkit 1.20

DESCRIPTION

       These are the release notes for nbdkit stable release 1.20.  This describes the major
       changes since 1.18.

       nbdkit 1.20.0 was released on 2nd May 2020.

   Security
       There were no security issues found.  All past security issues and information about how
       to report new ones can be found in nbdkit-security(1).

   Plugins
       New nbdkit-tmpdisk-plugin(1) is a scriptable “remote tmpfs” for creating temporary
       filesystems (eg. for thin clients), and also for blank or prepopulated temporary disks.

       nbdkit-data-plugin(1) now has support for prepopulating disks with more complex test
       patterns such as repeated sequences of bytes.

       nbdkit-curl-plugin(1) now supports setting a proxy, enabling TCP keepalives, and disabling
       Nagle’s algorithm.

       nbdkit-perl-plugin(1) now supports API version 2.  In particular the full NBD client flags
       are visible to plugins, along with support for the ".get_ready" callback.  Also there is a
       new function "Nbdkit::debug" which is a wrapper around the "nbdkit_debug" API.

       nbdkit-vddk-plugin(1) drops support for VDDK 5.1.1.  This version was last updated in 2014
       and is no longer supported by VMware.  Since this was the last version of VDDK to support
       i686, 32-bit support is also dropped (Eric Blake).

   Language bindings
       Plugins may now be written in Golang, see nbdkit-golang-plugin(3) (thanks Dan Berrangé,
       James Shubin).

       OCaml plugins can now access "nbdkit_realpath", "nbdkit_nanosleep", "nbdkit_export_name"
       and "nbdkit_shutdown".

       Python plugins now transparently support fail-fast zero (Eric Blake).

   Filters
       New nbdkit-exitlast-filter(1) causes nbdkit to exit after the last client connection.

       New nbdkit-limit-filter(1) allows you to limit the number of clients which can
       simultaneously connect to any plugin.

   Server
       The --run option now waits for the nbdkit plugin and nbdkit to exit before returning to
       the caller.  This allows for more predictable clean up in shell scripts using this
       feature.

       nbdkit --dump-config output now includes separate lines for "version_major" and
       "version_minor", making it easier to find out from shell scripts which version of nbdkit
       is installed.

       nbdkit -s option (which connects to the client over stdin/stdout) now rejects various
       options that would also try to read from or write to stdin/stdout, for example
       --dump-plugin or "password=-" (Eric Blake).

   API
       New "nbdkit_shutdown" call which allows plugins to ask for nbdkit to exit.  This is used
       to implement the new "exitlast" filter.

       New "nbdkit_stdio_safe" call allows plugins to check if reading from stdin or writing to
       stdout is safe, eg. if it is safe to read passwords interactively (Eric Blake).

       "can_*" callbacks which return booleans can return any value ≥ 1 to mean true.  Previous
       versions of nbdkit had inconsistent behaviour if plugins returned anything other than 1
       for true (Eric Blake).

   Bug fixes
       nbdkit-tar-plugin now works and there is a regression test for it.

       nbdkit-curl-plugin(1) -D curl.version=1 option now works.

       Fixed a rare hang when closing a connection in nbdkit-nbd-plugin(1) (Eric Blake).

       Fix compilation on certain platforms with clang (Khem Raj).

       Don’t leak $tmpdir from nbdkit-sh-plugin(3) into the --run subcommand.

       nbdkit now correctly sets "FD_CLOEXEC" when using systemd socket activation (Eric Blake).

   Documentation
       The nbdkit-plugin(3) man page has been overhauled completely to make it easier to follow.
       Also we now have documentation for how to compile plugins in various environments which
       was missing before.

   Tests
       All valgrind tests now pass.

       “Old plugin” tests were added for v1.18.2 on x86-64, and a variety of old plugins compiled
       on i686.  The i686 plugins will allow us to test for regressions in 32 bit support.

       Tests of the nbd plugin should now be stable (Eric Blake).

       There is an additional test combining the offset and truncate filters, which tests several
       corner cases as well as providing tests of error handling between layers.

   Build
       nbdkit-nbd-plugin(1) now requires libnbd.  (If libnbd is not present at build time then
       this plugin is not built).  The fallback code in this plugin which made NBD connections by
       constructing NBD command packets without using libnbd has been removed (Eric Blake).

       scripts/git.orderfile has been improved so that commands like "git diff" and "git show"
       display OCaml sources in a natural order with interface first followed by implementation.

       Various fixes for MinGW.  Note MinGW / MSYS support is a work in progress and not finished
       yet (Frank Gu).

       Multiple fixes to Haiku build.

       awk(1) is no longer required to run the tests.  It was a “hidden” required dependency, but
       all use of it has now been eliminated.

   Internals
       There is now an internal utility library for creating vectors/lists of objects, for
       example lists of strings (common/utils/vector.h).  It is widely used by the server,
       plugins and filters.

       README discusses how to use lcov(1) for code coverage reports.

SEE ALSO

       nbdkit(1).

AUTHORS

       Authors of nbdkit 1.20:

       Eric Blake
           (33 commits)

       Khem Raj
           (1 commit)

       Richard W.M. Jones
           (134 commits)

       Frank Gu
           (6 commits)

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.