Resolve JAVA_HOME for source builds lazily #1027
Merged
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With this commit we resolve JAVA_HOME lazily when attempting to build
Elasticsearch. When a source build is externally provided to Rally's
source artifact cache, there is no need to actually build it. However,
if the target system does not have any JDK installed and we attempt to
install Elasticsearch, the build subsystem is eagerly initialized
(despite the artifact being already cached) and is complaining that it
cannot find a JDK to build the artifact. By lazily resolving JAVA_HOME
we avoid that error.