jrubyPrepare fails to resolve dependencies like 1.5.0.alpha.8

[xlijun]

Backgroud:
I am trying to requires asciidoctor-pdf-cjk-kai_gen_gothic into asciidoc gradle plugin.

Error Message (from jrubyPrepare):
Could not find any matches for rubygems:asciidoctor-pdf:[1.5.0.alpha.8-SNAPSHOT,1.5.99999] as no versions of rubygems:asciidoctor-pdf are available.

Configuration:

buildscript {
  ...
  dependencies {
    'com.github.jruby-gradle:jruby-gradle-plugin:1.5.0'
  }
}
apply plugin: "com.github.jruby-gradle.base"
dependencies {
    gems "rubygems:asciidoctor-pdf-cjk-kai_gen_gothic:0.1.1"
}
asciidoctor {
  ...
  dependsOn test
  dependsOn jrubyPrepare
  gemPath jrubyPrepare.outputDir

  attributes 'pdf-style': 'KaiGenGothicCN'
  requires 'asciidoctor-pdf-cjk-kai_gen_gothic'
  ...
}

It seems like the version resolution algorithm used by jrubyPrepare is not fully compatible with native ruby.

[mkristian]

@smartg00se you are right the gradle version resolution or the underlying mapping from rubygems to maven is not 100% compatible. for example it will not pick prereleased versions of gems from a range of versions, otherwise we would default to --prerelease install gems which is rarely what you want.

the maven repository excludes these prerelease version from the version range BUT they can be cherrypicked. so the only workaround for you is to add a gem dependency rubygems asciidoctor-pdf 1.5.0.alpha.8. once there is a released version of this gem you can remove this cherrypick.

[xlijun]

I've tried to cherrypick rubygems asciidoctor-pdf 1.5.0.alpha.8, however the resolution also fails with the same exception above. It seems 1.5.0.alpha.8 is not treated as in the range [1.5.0.alpha.8-SNAPSHOT,1.5.99999].

[ysb33r]

@xlijun This issue does show a defect, but before I address the potential solution to this, I would to say that if you use a GEM that has asciidoctor or asciidoctor-pdf has a transitive dependency you should exclude those, because they are bundled within the specific asciidoctorj and asciidoctorj-pdf JARS. So you would do

dependencies {
    gems 'rubygems:asciidoctor-pdf-cjk-kai_gen_gothic:0.1.1', {
        exclude module : 'asciidoctor-pdf'
    }
}

[ysb33r]

Now as to the fix for the most general case, I now have a solution that will go into 2.0.0 when it is released. The idea with the fix is that specific configurations or just modules can use Gradle's standard Ivy resolution rules rather the GEM version (bundler-like) resolution rules.

        gemResolverStrategy {
            excludeModule ~/^asciidoctor-pdf$/, ~/.+(alpha|beta).*/ 
        }
        
        dependencies {
            gems 'rubygems:asciidoctor-pdf-cjk-kai_gen_gothic:0.1.1'
            gems 'rubygems:asciidoctor-pdf:1.5.0.alpha.8'
        }

In gemResolverStrategy one would be able to configure the behaviour of the GemVersionResolver. In this case we specifically exclude asciidoctor-pdf, but allow asciidoctor-pdf-cjk* to be resolved by bundler-like rules.

[ysb33r]

PR #377 addresses this.

[rtyler]

I'm going to close this, the work that @ysb33r I believe do address this use case, and will be documented as part of #378