logstash-plugin update fails on redis 4.0.0 dependency due to java version 2.2 requirement

[ryanschwartz]

Full debug output attached, but the root of it is
Gem::InstallError: redis requires Ruby version >= 2.2.2.

This dependency is the result of s.add_runtime_dependency(%q<redis>, [">= 0"]) in the logstash-input-redis-3.1.3.gemspec that's being used.

Results can be replicated with a minimal Dockerfile:

FROM docker.elastic.co/logstash/logstash:5.5.2
# uncomment these ENV lines for full debug output
#ENV JARS_DEBUG=true
#ENV JARS_VERBOSE=true
#ENV DEBUG=1
RUN logstash-plugin update

docker.build.txt

[jarpy]

Thanks for the report.

I think it would be best to raise this issue in the logstash-input-redis repository, where the code is maintained. This issue will affect all users of the plugin, not just Docker users.

$ tar -zxf logstash-5.5.2.tar.gz
$ ./logstash-5.5.2/bin/logstash-plugin update logstash-input-redis
Updating logstash-input-redis
Error Bundler::InstallError, retrying 1/10
An error occurred while installing redis (4.0.0), and Bundler cannot continue.
Make sure that `gem install redis -v '4.0.0'` succeeds before bundling.

[ryanschwartz]

Thanks @jarpy - new PRs opened in the effected logstash-*-redis repos.

logstash-plugins/logstash-input-redis#58
logstash-plugins/logstash-output-redis#53