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Add explanation of the configuration trick used to find transitive deps 

for exclusion
This commit is contained in:
Ryan Ernst 2015-11-13 14:59:45 -08:00
parent be147719ff
commit 24d306c2f4
1 changed files with 26 additions and 7 deletions
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33
buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy
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@ -101,7 +101,28 @@ class BuildPlugin implements Plugin<Project> {
project.ext.javaHome = project.rootProject.ext.javaHome
}
/** Makes dependencies non-transitive by default */
/** Return the name
*/
static String transitiveDepConfigName(String groupId, String artifactId, String version) {
return "_transitive_${groupId}:${artifactId}:${version}"
}
/**
* Makes dependencies non-transitive.
*
* Gradle allows setting all dependencies as non-transitive very easily.
* But this mechanism does not translate into maven pom generation. In order
* to effectively make the pom act as if it has no transitive dependencies,
* we must exclude each transitive dependency of each direct dependency.
*
* Determining the transitive deps of a dependency which has been resolved as
* non-transitive is difficult because the process of resolving removes the
* transitive deps. To sidestep this issue, we create a configuration per
* direct dependency version. This specially named and unique configuration
* will contain all of the transitive dependencies of this particular
* dependency. We can then use this configuration during pom generation
* to iterate the transitive dependencies and add excludes.
*/
static void configureConfigurations(Project project) {
// fail on any conflicting dependency versions
project.configurations.all({ Configuration configuration ->
@ -119,12 +140,11 @@ class BuildPlugin implements Plugin<Project> {
dep.transitive = false
// also create a configuration just for this dependency version, so that later
// we can determine which dependencies it has (for pom generation excludes)
String depId = "${dep.getGroup()}:${dep.getName()}:${dep.getVersion()}"
String depConfig = "_transitive_${depId}"
// we can determine which transitive dependencies it has
String depConfig = transitiveDepConfigName(dep.group, dep.name, dep.version)
if (project.configurations.findByName(depConfig) == null) {
project.configurations.create(depConfig)
project.dependencies.add(depConfig, depId)
project.dependencies.add(depConfig, "${dep.group}:${dep.name}:${dep.version}")
}
}
}
@ -149,8 +169,7 @@ class BuildPlugin implements Plugin<Project> {
String version = depNode.get('version').get(0).text()
// collect the transitive deps now that we know what this dependency is
String depId = "${groupId}:${artifactId}:${version}"
String depConfig = "_transitive_${depId}"
String depConfig = transitiveDepConfigName(groupId, artifactId, version)
Configuration configuration = project.configurations.findByName(depConfig)
if (configuration == null) {
continue // we did not make this dep non-transitive