File README.updating of Package kafka-kit

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File README.updating of Package kafka-kit

This package provides build dependencies for building Kafka using using Tetra
(ruby2.2-rubygem-tetra). Using Tetra is neccessary due Kafka's Gradle based
build process downloading dependencies at build time. Tetra will keep track of
these downloaded dependencies during a so-called "dry-run" build on the
maintainer's machine and generate a tarball (kafka-kit.tar.xz) containing all
of them. This tarball is then used to allow the same build to run in an offline
manner for the kafka package in OBS (where there is no Internet connectivity on
purpose in order to allow for reproducible builds). To generate kafka-kit.tar.xz
for a new version of Kafka, proceed as follows (you will need to have Tetra
installed for this):

1) Download an updated Kafka tarball. We'll assume the new version is 2.1.0
   throughout the rest of this file, which is the version the package was at at
   the time of this writing. Please substitute 2.1.0 by the actual version number
   wherever it occurs.

2) Initialize a tetra build directory for your new tarball and cd to its source
   directory:

# OBS checkouts may have colons in their directory names which messes with some
     # Java build tools, so use a neutral location:
     cp kafka-2.1.0-src.tar.gz /tmp; cd /tmp
     tetra init kafka kafka-2.1.0-src.tgz

# We need gradle to build, so download and unpack it.
     # Note: newer Kafka versions may need newer gradle versions.
     cd /tmp/kafka/kit/
     wget https://services.gradle.org/distributions/gradle-5.1-bin.zip
     unzip gradle-5.1-bin.zip; rm gradle-5.1-bin.zip

3) Perform a dry-run build with Tetra:

cd /tmp/kafka/src/kafka-2.1.0-src
     tetra dry-run
     ../../kit/gradle-5.1/bin/gradle --gradle-user-home /tmp/gradle --project-cache-dir /tmp/gradle-project releaseTarGz -x signArchives
     cp -r /tmp/gradle* ../../kit/
     exit

4) Generate the new kit tarball:

tetra generate-all

You will now find an updated kit tarball in
/tmp/kafka/packages/kafka-kit/kafka-kit.tar.xz

Substitute this tarball for the existing one in the kit package and bump its
version.

Note: these instructions applied for Kafka-2.1.0 and may not be sufficient
for more recent Kafka versions. If they turn out to yield a broken kit
tarball and you end up fixing it, please update this file. Thank you!

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