Incorporate release.rss generation into our build process (#257)

* Remove legacy build tooling, we have long since migrated

* Update and move the releas.rss.groovy generation into the site build process

This doesn't make sense to execute as a separate process, we can just put it
inline with our existing site generation infrastructure

Fixes INFRA-663

* Ensure the fetchReleaseHistory task will execute if build/ does not yet exist

With a clean clone, this was breaking

build.gradle

@@ -27,7 +27,6 @@ import com.github.jrubygradle.JRubyExec
 
 ext.gitRef = Grgit.open('.')?.head()?.abbreviatedId
 ext.siteOutputDir = "${buildDir}/_site"
-ext.legacyOutputDir = "${buildDir}/_legacy"
 
 description = 'Build for generating jenkins.io'
 version = "2.0.${System.env.BUILD_NUMBER ?: '0'}+${ext.gitRef}"
@@ -68,6 +67,8 @@ dependencies {
     /* needed for clean HTTP accesses */
     externalFetcher 'rubygems:faraday:[0.9.2,1.0)'
     externalFetcher 'rubygems:faraday_middleware:[0.9.2,1.0)'
+    /* used for running release.rss.groovy */
+    externalFetcher localGroovy()
 }
 
 /* for fetching javascript assets that we need for building the legacy and new
@@ -102,6 +103,18 @@ bower {
     }
 }
 
+task fetchReleaseHistory(type: JavaExec) {
+    group 'Site'
+    classpath = configurations.externalFetcher
+    main = 'groovy.ui.GroovyMain'
+    def groovyScript = "${projectDir}/scripts/release.rss.groovy"
+    args groovyScript, "http://updates.jenkins.io/release-history.json"
+
+    file(project.ext.siteOutputDir).mkdirs()
+
+    standardOutput file("${project.ext.siteOutputDir}/release.rss").newOutputStream()
+    inputs.source file(groovyScript)
+}
 
 task fetchExternalResources(type: JRubyExec) {
     group 'Site'
@@ -111,28 +124,6 @@ task fetchExternalResources(type: JRubyExec) {
     inputs.source file("${projectDir}/scripts/fetch-external-resources")
 }
 
-task compileLegacyContent(type: JRubyExec) {
-    group 'Site'
-    description 'Compile the site using the awestruct CLI'
-    dependsOn 'fetchExternalResources'
-    script 'awestruct'
-    environment 'LEGACY' : true
-    scriptArgs '--generate', '--verbose',
-                /* forcefully set the site.base_url since the config is not
-                 * being respected
-                 */
-                '--url', 'https://jenkins-ci.org',
-                '--source-dir', "${projectDir}/${contentDir}",
-                '--output-dir', project.ext.legacyOutputDir
-    /* without the --force option, awestruct is not smart enough to regenerate
-     * files based on includes */
-    configuration 'asciidoctor'
-    inputs.source fileTree(projectDir)
-                    .include("${contentDir}/**/*.adoc")
-                    .include("${contentDir}/**/*.haml")
-                    .include("${contentDir}/**/*.md")
-}
-
 task compileContent(type: JRubyExec) {
     group 'Site'
     description 'Compile the site using the awestruct CLI'
@@ -160,14 +151,12 @@ task prepareJavaScripts {
     dependsOn bowerInstall
 
     doLast {
-        [project.ext.siteOutputDir, project.ext.legacyOutputDir].each {
-            def assetsDir = file("${it}/assets")
-            assetsDir.mkdirs()
-
-            copy {
-                from "${projectDir}/src/assets"
-                into assetsDir
-            }
+        def assetsDir = file("${project.ext.siteOutputDir}/assets")
+        assetsDir.mkdirs()
+
+        copy {
+            from "${projectDir}/src/assets"
+            into assetsDir
         }
     }
 }
@@ -176,8 +165,8 @@ task assemble {
     group 'Site'
     description 'Assemble the full site'
     dependsOn fetchExternalResources,
+                fetchReleaseHistory,
                 compileContent,
-                compileLegacyContent,
                 prepareJavaScripts
 }
 
@@ -195,24 +184,10 @@ task archiveBeta(type: Zip) {
     destinationDir = targetDir
 }
 
-task archiveLegacy(type: Zip) {
-    def computedDirName = "jenkins.io-${project.version}"
-
-    group 'Site'
-    description 'Create a zip archive of the site for deployment'
-    dependsOn assemble
-    archiveName "${computedDirName}.zip"
-    into(computedDirName) { from project.ext.legacyOutputDir }
-
-    File targetDir = file("${buildDir}/archives")
-    targetDir.mkdirs()
-    destinationDir = targetDir
-}
-
 task archive {
     group 'Site'
     description 'Create a zip archive of the site for deployment'
-    dependsOn archiveLegacy, archiveBeta
+    dependsOn archiveBeta
 }
 
 task run(type:Exec) {
@@ -232,4 +207,3 @@ def defineDevTask(name, body) {
 }
 
 defineDevTask('dev') {}
-defineDevTask('dev-legacy') { environment 'LEGACY', 'true' }

scripts/release.rss.groovy

@@ -0,0 +1,58 @@
+#!/usr/bin/env groovy
+/*
+ generate the plugin/core release history RSS
+
+ Usage: release-rss.groovy <URL of release-hisotory.json>
+*/
+
+import groovy.json.JsonSlurper
+import groovy.xml.MarkupBuilder
+import java.text.*
+
+def xsd(dt) {
+  s = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ").format(dt);
+  return s[0..-3]+':'+s[-2..-1]
+}
+def df = new SimpleDateFormat("MMM dd, yyyy");
+
+def json = new JsonSlurper().parse(new URL(args[0]));
+
+def toGA(gav) {
+    return gav.substring(0,gav.lastIndexOf(':'))
+}
+
+def first = [:]; // GA -> GAV to indicate the first version of the release
+json.releaseHistory.reverse().each { i ->
+  i.releases.each { r ->
+    gav = r.gav
+    if (gav) {
+      first[toGA(gav)] = gav
+    }
+  }
+}
+
+def xml = new MarkupBuilder(new OutputStreamWriter(System.out))
+xml.feed(xmlns:"http://www.w3.org/2005/Atom") {
+  title("Jenkins plugin releases")
+  link(href:"http://jenkins-ci.org/")
+  link(href:"http://kohsuke.org/test.atom",rel:"self",type:"application/atom+xml")
+  updated(xsd(new Date()))
+  author { name("Jenkins History Bot") }
+  id("urn:63067410335c11e0bc8e0800200c9a66:feed")
+
+  json.releaseHistory.reverse().subList(0,30).each { i ->
+    i.releases.each { r ->
+      if (r.gav) {
+        entry {
+          s = (first[toGA(r.gav)] == r.gav) ? " (new)" : ""
+          title("${r.title} ${r.version}${s}")
+          link(href:r.wiki,rel:"alternate",type:"text/html")
+          id("urn:63067410335c11e0bc8e0800200c9a66:${r.gav}")
+          pubished(xsd(new Date(r.timestamp)))
+          updated(xsd(new Date(r.timestamp)))
+          summary("${r.title} ${r.version}")
+        }
+      }
+    }
+  }
+}