Version difference in the Ruby version installed and directories created as part of RPM installation

[pratiks...@gmail.com]

Hi,

I have downloaded td-agent RPM v4.2.0. I see that the ruby getting installed has version 2.7.4. However, the directories getting created has version 2.7.0 as shown below:

/opt/td-agent/lib/ruby/2.7.0

/opt/td-agent/lib/ruby/vendor_ruby/2.7.0

/opt/td-agent/lib/ruby/gems/2.7.0

/opt/td-agent/lib/ruby/gems/2.7.0/extensions/x86_64-linux/2.7.0

/opt/td-agent/lib/ruby/site_ruby/2.7.0

bash-4.2# cat /usr/sbin/td-agent

#!/opt/td-agent/bin/ruby

ENV["GEM_HOME"]="/opt/td-agent/lib/ruby/gems/2.7.0/"

ENV["GEM_PATH"]="/opt/td-agent/lib/ruby/gems/2.7.0/"

ENV["FLUENT_CONF"]="/etc/td-agent/td-agent.conf"

ENV["FLUENT_PLUGIN"]="/etc/td-agent/plugin"

ENV["FLUENT_SOCKET"]="/var/run/td-agent/td-agent.sock"

if ARGV.include?("--version")

  require "/opt/td-agent/share/config"

  Dir.glob("/opt/td-agent/lib/ruby/**/gems/**/fluent/version.rb").each do |v|

    require v.delete_suffix(".rb")

  end

  puts "td-agent #{PACKAGE_VERSION} fluentd #{Fluent::VERSION} (#{FLUENTD_REVISION})"

  exit 0

end

load "/opt/td-agent/bin/fluentd"

The version getting installed is:

bash-4.2# /opt/td-agent/bin/ruby -v
ruby 2.7.4p191 (2021-07-07 revision a21a3b7d23) [x86_64-linux]
bash-4.2#

Please explain why there is a mismatch and how these directories are getting created with name having an older version .

Thanks in advance

 

[hiroshi hatake]

Hi, 

This is normal behavior and td-agent uses rubygems mechanism to load Fluentd plugins and its dependencies.

This value glitch comes from:

https://github.com/rubygems/rubygems/blob/ec7ad1686829519516bb28530dde0c928876b70e/lib/rubygems/defaults.rb#L36

And RbConfig::CONFIG['ruby_version'] should be returned 2.7.0 instead of 2.7.4 when you using Ruby 2.7.4.

Thanks to this behavior, Ruby ensures gems compatibilities for patch level versions.

Best,

Hiroshi

2021年8月13日(金) 19:12 pratiks...@gmail.com <pratiks...@gmail.com>:

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