Add installDir project property detection

docs/installLiberty.md

@@ -120,6 +120,18 @@ This will get version 19.0.0.11 of `com.ibm.websphere.appserver.runtime:wlp-webP
     }
   ```
 
+#### Override installDir 
+
+In gradle.properties:
+```
+liberty.installDir=<path to installed wlp>
+```
+
+From the command line:
+```
+gradle build -Pliberty.installDir=<path to installed wlp>
+```
+
 #### Using Maven artifact
 
 Use the [dependencies block](#dependencies) to specify the name of the repository artifact that contains your custom Liberty server or use one of the provided artifacts on [The Central Repository](http://search.maven.org/#search%7Cga%7C1%7Ccom.ibm.websphere.appserver.runtime).  

docs/libertyExtensions.md

@@ -14,7 +14,7 @@ The [deploy](deploy.md), [undeploy](undeploy.md), [libertyPackage](libertyPackag
 | --------- | ---- | ----- | ----------- | ---------|
 | baseDir | String | 3.0 | The base installation directory. The actual installation directory of WebSphere Liberty server will be `${baseDir}/wlp`. The default value is `${project.buildDir}`. This was moved from the properties in the `install` block in version 3.0.| No |
 | cacheDir | String | 3.0 | The directory used for caching downloaded files such as the license or `.jar` files. The default value is `${java.io.tmpdir}/wlp-cache`. This was moved from the properties in the `install` block in version 3.0.| No |
-| installDir | String | 1.0 | Path to the WebSphere Liberty server installation `wlp` directory. To use a pre-installed version of Liberty, set this property to the path of the Liberty `wlp` directory, including `wlp` in the path. | No |
+| installDir | String | 1.0 | Path to the WebSphere Liberty server installation `wlp` directory. To use a pre-installed version of Liberty, set this property to the path of the Liberty `wlp` directory, including `wlp` in the path. Additionally, `installDir` can be specified in the `gradle.properties` file or from the [command line](installLiberty.md#override-installDir). | No |
 | outputDir | String | 1.0 | Deprecated. Value of the `${wlp_output_dir}` variable. The default value is `${installDir}/usr/servers/${serverName}`. This parameter has moved to the `server` block. | No |
 | runtime | Properties | 3.0 | For overriding the `group`, `name` or `version` of the `libertyRuntime` installed from The Central Repository. The default runtime artifact is the latest version of `io.openliberty:openliberty-kernel`.
 | userDir | String | 1.0 | Value of the `${wlp_user_dir}` variable. The default value is `${installDir}/usr/`. | No |

src/main/groovy/io/openliberty/tools/gradle/Liberty.groovy

@@ -169,27 +169,28 @@ class Liberty implements Plugin<Project> {
     }
 
     private static File getInstallDir(Project project) {
-        if (project.liberty.installDir == null) {
-           if (project.liberty.baseDir == null) {
-               return new File(project.buildDir, 'wlp')
-           } else {
-               return new File(project.liberty.baseDir, 'wlp')
-           }
+        if (project.hasProperty('liberty.installDir')) {
+            File installDir = checkAndAppendWlp(project, new File(project.projectDir, project.getProperties().get('liberty.installDir')))
+            project.getLogger().info("installDir project property detected. Using ${installDir.getCanonicalPath()}.")
+            return installDir
+        } else if (project.liberty.installDir == null) {
+            if (project.liberty.baseDir == null) {
+                return new File(project.buildDir, 'wlp')
+            } else {
+                return new File(project.liberty.baseDir, 'wlp')
+            }
         } else { // installDir is specified
-            String installDirPath = checkAndAppendWlp(project)
-            File installDir = new File(installDirPath)
-
-            return installDir;
+            return checkAndAppendWlp(project, new File(project.liberty.installDir));
         }
     }
 
-    private static String checkAndAppendWlp(Project project) {
-        String installDir = project.liberty.installDir
-        if (installDir.endsWith("wlp")) {
+    private static File checkAndAppendWlp(Project project, File installDir) {        
+        if (installDir.toString().endsWith("wlp")) {
             return installDir
         } else { // not valid wlp dir
             project.getLogger().warn(MessageFormat.format("The installDir {0} path does not reference a wlp folder. Using path {0}/wlp instead.", installDir))
-            return new File(installDir, 'wlp').toString()
+            return new File(installDir, 'wlp')
         }
     }
+
 }

src/test/groovy/io/openliberty/tools/gradle/InstallLiberty_installDir_missing_wlp_Test.groovy

@@ -26,6 +26,8 @@ class InstallLiberty_installDir_missing_wlp_Test extends AbstractIntegrationTest
     static File resourceDir = new File("build/resources/test/install-dir-property-test/installDir-missing-wlp")
 
     static File buildDir = new File(integTestDir, "/InstallLiberty_installDir_missing_wlp")
+    static String expectedPropertyDir = new File(buildDir, 'installDir-valid-install/build/wlp').getCanonicalPath()
+
     static String buildFilename = "build.gradle"
 
     @BeforeClass
@@ -45,4 +47,29 @@ class InstallLiberty_installDir_missing_wlp_Test extends AbstractIntegrationTest
         String output = result.getOutput()
         assert output.contains("path does not reference a wlp folder") : "Expected warning about installDir path not containing wlp"
     }
+
+    @Test
+    void test_installLiberty_installDir_cli_property_wlp() {
+        BuildResult result = GradleRunner.create()
+            .withProjectDir(buildDir)
+            .forwardOutput()
+            .withArguments('installLiberty', '-Pliberty.installDir=installDir-valid-install/build/wlp', '-i', '-s')
+            .build()
+
+        String output = result.getOutput()
+        assert output.contains("installDir project property detected. Using $expectedPropertyDir")
+    }
+
+    @Test
+    void test_installLiberty_installDir_cli_property() {
+        BuildResult result = GradleRunner.create()
+            .withProjectDir(buildDir)
+            .forwardOutput()
+            .withArguments('installLiberty', '-Pliberty.installDir=installDir-valid-install/build', '-i', '-s')
+            .build()
+
+        String output = result.getOutput()
+        assert output.contains("installDir project property detected. Using $expectedPropertyDir".drop(4))
+        assert output.contains("Using path $expectedPropertyDir instead.")
+    }
 }