Gradle plugin support for dependencies in plugin descriptor properties

[abseth-amzn]

Description

#11441 added support for semver ranges in dependencies of plugins. This commit updates the opensearchplugin (from org.opensearch.gradle:build-tools) to support dependencies property when building plugins. Without this support, plugin's plugin-descriptor.properties file would require manual update to add dependencies property. With this support, it would be possible to build plugins with semver range support for opensearch using gradle code. Example usage:

opensearchplugin {
  description = '<Plugin description>'
  classname = '<Plugin class name>'
  dependencies = '{opensearch: "3.0.0"}'
}

Since no plugin is currently using dependencies property, this change would simply add empty dependencies property to plugin-descriptor.properties file. Example:

description=The Mapper Murmur3 plugin allows to compute hashes of a field's values at index-time and to store them in the index.
version=3.0.0-SNAPSHOT
name=mapper-murmur3
classname=org.opensearch.plugin.mapper.MapperMurmur3Plugin
java.version=21
opensearch.version=3.0.0
custom.foldername=
extended.plugins=
has.native.controller=false
dependencies=

Note - before this commit, opensearch process would reject above mentioned plugin-descriptor.properties file since it contains both opensearch.version and dependencies property. With this commit, PluginInfo is being updated to allow files like above since one of these properties is empty.
Hence this is a breaking change in opensearchplugin. The plugin-descriptor.properties file created by this plugin would not be accepted by older opensearch versions.

Following is an example of plugin-descriptor.properties file with dependencies property specified by the plugin in build.gradle (note empty opensearch.version property):

description=The Mapper Murmur3 plugin allows to compute hashes of a field's values at index-time and to store them in the index.
version=3.0.0-SNAPSHOT
name=mapper-murmur3
classname=org.opensearch.plugin.mapper.MapperMurmur3Plugin
java.version=21
opensearch.version=
custom.foldername=
extended.plugins=
has.native.controller=false
dependencies={opensearch: "3.0.0"}

Related Issues

Resolves #13187

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

✅ Gradle check result for 9814445: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 72.40%. Comparing base (3c55a31) to head (9814445).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
.../opensearch/gradle/plugin/PluginBuildPlugin.groovy	0.00%	2 Missing and 1 partial ⚠️
...earch/gradle/plugin/PluginPropertiesExtension.java	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17178      +/-   ##
============================================
+ Coverage     72.35%   72.40%   +0.04%     
- Complexity    65500    65662     +162     
============================================
  Files          5298     5306       +8     
  Lines        304603   304929     +326     
  Branches      44187    44256      +69     
============================================
+ Hits         220397   220777     +380     
+ Misses        66095    66035      -60     
- Partials      18111    18117       +6     

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[rursprung]

thanks @abseth-amzn!
may i (strongly) suggest backporting it to 2.x (namely 2.19 as it's supposed to be the last 2.x release)? that way future 2.19.x fix releases don't need re-releases of 3rd party plugins (if they start using the semver feature for their 2.19.0 release).