Use a label for MINGW/OSX builds in PR

By setting the label CI/Build OSX (or MINGW), Jenkins will now build
this PR also with the selected target(s). Useful if you do not have
access to a Mac machine and want to make sure you don't break it.

.CI/common.groovy

@@ -20,7 +20,7 @@ def numPhysicalCPU() {
   if (env.JENKINS_NUM_PHYSICAL_CPU) {
     return env.JENKINS_NUM_PHYSICAL_CPU
   }
-  
+
   if (isWindows())
   {
     return env.NUMBER_OF_PROCESSORS.toInteger() / 2 ?: 1
@@ -98,7 +98,7 @@ void partest(cache=true, extraArgs='') {
   } else {
   sh "rm -f omc-diff.skip && ${makeCommand()} -C testsuite/difftool clean && ${makeCommand()} --output-sync -C testsuite/difftool"
   sh 'build/bin/omc-diff -v1.4'
-  
+
   sh ("""#!/bin/bash -x
   ulimit -t 1500
   ulimit -v 6291456 # Max 6GB per process
@@ -180,7 +180,7 @@ void buildOMC(CC, CXX, extraFlags) {
      ) > buildOMCWindows.sh
 
      set MSYSTEM=MINGW64
-	 set MSYS2_PATH_TYPE=inherit
+   set MSYS2_PATH_TYPE=inherit
      %OMDEV%\\tools\\msys\\usr\\bin\\sh --login -i -c "cd `cygpath ' ${WORKSPACE} '` && chmod +x buildOMCWindows.sh && ./buildOMCWindows.sh && rm -f ./buildOMCWindows.sh"
   """)
   } else {
@@ -209,7 +209,7 @@ void buildGUI(stash) {
      ) > buildGUIWindows.sh
 
      set MSYSTEM=MINGW64
-	 set MSYS2_PATH_TYPE=inherit
+   set MSYS2_PATH_TYPE=inherit
      %OMDEV%\\tools\\msys\\usr\\bin\\sh --login -i -c "cd `cygpath ' ${WORKSPACE} '` && chmod +x buildGUIWindows.sh && ./buildGUIWindows.sh && rm -f ./buildGUIWindows.sh"
   """)
   } else {
@@ -284,4 +284,26 @@ def makeCommand() {
   return env.GMAKE ?: "make"
 }
 
+def shouldWeBuildOSX() {
+  if (env.CHANGE_ID) {
+    if (pullRequest.labels.contains("CI/Build OSX")) {
+      return true
+    }
+  }
+  return params.BUILD_OSX
+}
+
+def shouldWeBuildMINGW() {
+  if (env.CHANGE_ID) {
+    if (pullRequest.labels.contains("CI/Build MINGW")) {
+      return true
+    }
+  }
+  return params.BUILD_MINGW
+}
+
+def isPR() {
+  return env.CHANGE_ID ? true : false
+}
+
 return this

Jenkinsfile

@@ -1,4 +1,7 @@
 def common
+def shouldWeBuildOSX
+def shouldWeBuildMINGW
+def isPR
 pipeline {
   agent none
   options {
@@ -24,8 +27,15 @@ pipeline {
             def buildNumber = env.BUILD_NUMBER as int
             if (buildNumber > 1) milestone(buildNumber - 1)
             milestone(buildNumber)
+            isPR = true
+          } else {
+            isPR = false
           }
           common = load("${env.workspace}/.CI/common.groovy")
+          shouldWeBuildOSX = common.shouldWeBuildOSX()
+          print "shouldWeBuildOSX: ${shouldWeBuildOSX}"
+          shouldWeBuildMINGW = common.shouldWeBuildMINGW()
+          print "shouldWeBuildMINGW: ${shouldWeBuildMINGW}"
         }
       }
     }
@@ -68,7 +78,8 @@ pipeline {
             }
           }
           when {
-            expression { params.BUILD_OSX }
+            beforeAgent true
+            expression { shouldWeBuildOSX }
           }
           environment {
             RUNTESTDB = '/Users/hudson/jenkins-cache/runtest/'
@@ -94,7 +105,8 @@ pipeline {
             }
           }
           when {
-            expression { params.BUILD_MINGW }
+            beforeAgent true
+            expression { shouldWeBuildMINGW }
           }
           environment {
             RUNTESTDB = '/c/dev/'
@@ -486,9 +498,8 @@ pipeline {
             }
           }
           when {
-            not {
-              changeRequest()
-            }
+            beforeAgent true
+            expression { not isPR }
           }
           steps {
             unstash 'compliance'
@@ -505,9 +516,8 @@ pipeline {
             }
           }
           when {
-            not {
-              changeRequest()
-            }
+            beforeAgent true
+            expression { not isPR }
           }
           steps {
             unstash 'usersguide'