docker: use backports for zfsutils

The userspace part of zfs seems to have a major breakage between 2.1 and 2.2
releases. This means that userspace utilities <= 2.1 cannot interact in a
meaningful way with a 2.2 ZFS kmod.

This is causing issues with users that already have ZFS 2.2, which may get even
more severe in the future, as Ubuntu 24.04 will ship with ZFS 2.2 out of the
box.

To fix the issue, install the zfs userspace utilities from debian backports:
they seem to be reasonably recent.

Tested with versions from ZFS 2.2 to 0.7.

Signed-off-by: Moritz Wanzenböck <[email protected]>

dockerfiles/piraeus-server/Dockerfile

@@ -14,6 +14,7 @@ RUN apt-get install -y gnupg2 && \
 	 sed -i -r 's/^Components: (.*)$/Components: \1 contrib/' /etc/apt/sources.list.d/debian.sources && \
 	 echo "deb http://packages.linbit.com/public" $DISTRO "misc" > /etc/apt/sources.list.d/linbit.list && \
 	 echo "deb http://packages.linbit.com/public/staging" $DISTRO "misc" >> /etc/apt/sources.list.d/linbit.list && \
+	 echo "deb http://deb.debian.org/debian $DISTRO-backports contrib" > /etc/apt/sources.list.d/backports.list  && \
 	 apt-get update && \
 	# Install useful utilities and general dependencies
 	 apt-get install -y udev drbd-utils jq net-tools iputils-ping iproute2 dnsutils netcat-traditional sysstat curl util-linux && \
@@ -42,7 +43,7 @@ RUN apt-get install -y gnupg2 && \
 	# zstd: used with thin-send-recv to send snapshots to another LINSTOR cluster \
 	  zstd \
 	# zfsutils-linux: for zfs storage pools \
-	  zfsutils-linux \
+	  zfsutils-linux/$DISTRO-backports \
 	 && \
 	# remove udev, no need for it in the container \
 	 apt-get remove -y udev && \