Manpages

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).