gzip filter is missing thus completely broken

[shasheene]

Hi,

The nbdkit gzip filter is broken on the platforms I tried: Ubuntu 20.04 (Focal), Ubuntu 20.10 (Groovy) and Debian 10 (Buster). The xz filter works fine though. To reproduce, run: `sudo nbdkit --filter=gzip myfile.gz`. It produces the following output:

> nbdkit: error: cannot open filter 'gzip': /usr/lib/x86_64-linux-gnu/nbdkit/filters/nbdkit-gzip-filter.so: cannot open shared object file: No such file or directory

The gzip and xz plugins are present, but in the gzip case the file named "nbdkit-gzip-filter.so" is missing:

https://packages.ubuntu.com/focal/amd64/nbdkit/filelist
https://packages.ubuntu.com/groovy/arm64/nbdkit/filelist
https://packages.debian.org/buster/amd64/nbdkit/filelist

Hopefully this bug can be fixed on all platforms, because this is a very promising program.

[shasheene (shasheene)]

Hmm, actually it looks like whilst there is a 'xz' plugin AND filter, in the current version of nbdkit there is *intended* to only be a 'gzip' plugin.

The gzip filter was only added in a very recent release in July 2020: https://<email address hidden>/msg20519.html

I guess this bug report can be closed then.

[Richard Jones (rjones-redhat)]

Thanks Shasheen for alerting me to this bug. We did indeed
change the original gzip plugin to a filter in nbdkit 1.22
(see https://libguestfs.org/nbdkit-release-notes-1.22.1.html#Filters)
However it seems as if Ubuntu is not packaging anything
beyond nbdkit 1.16.