Add check for Docker availability before register Docker plugin tasks

2.0/gradle/vividus-test-docker.gradle

@@ -26,58 +26,72 @@ buildscript {
 
 apply plugin: com.bmuschko.gradle.docker.DockerRemoteApiPlugin
 
-tasks.register('copyProjectLibrary', Copy) {
-    dependsOn = [build, jar]
-    from layout.buildDirectory.dir('libs')
-    into layout.buildDirectory.dir('docker/libs')
-}
-
-tasks.register('createTestsDockerfile', com.bmuschko.gradle.docker.tasks.image.Dockerfile) {
-    dependsOn = [copyProjectLibrary]
-    doFirst {
-        from("vividus/vividus:${project.ext.vividusVersion}")
-        copyFile('libs', '/vividus/libs/')
+def isDockerInstalled() {
+    try {
+        def proc = 'docker --version'.execute()
+        proc.text
+        proc.waitFor()
+        return proc.exitValue() == 0
+    } catch (Exception e) {
+        return false
     }
 }
 
-tasks.register('buildTestsImage', com.bmuschko.gradle.docker.tasks.image.DockerBuildImage) {
-    dependsOn = [createTestsDockerfile]
+if (isDockerInstalled()) {
+    tasks.register('copyProjectLibrary', Copy) {
+        dependsOn = [build, jar]
+        from layout.buildDirectory.dir('libs')
+        into layout.buildDirectory.dir('docker/libs')
+    }
 
-    doFirst {
-        def repositoryPath = getProperty('DOCKER_REPOSITORY_PATH', 'docker.repository-path')
-        if (repositoryPath == null) {
-            throw new StopExecutionException('Please set repository path using \'docker.repository-path\' gradle property'
-                + ' or \'DOCKER_REPOSITORY_PATH\' environemnt variable')
+    tasks.register('createTestsDockerfile', com.bmuschko.gradle.docker.tasks.image.Dockerfile) {
+        dependsOn = [copyProjectLibrary]
+        doFirst {
+            from("vividus/vividus:${project.ext.vividusVersion}")
+            copyFile('libs', '/vividus/libs/')
         }
+    }
+
+    tasks.register('buildTestsImage', com.bmuschko.gradle.docker.tasks.image.DockerBuildImage) {
+        dependsOn = [createTestsDockerfile]
 
-        images.add("${repositoryPath}/${project.name}:${project.version}")
+        doFirst {
+            def repositoryPath = getProperty('DOCKER_REPOSITORY_PATH', 'docker.repository-path')
+            if (repositoryPath == null) {
+                throw new StopExecutionException('Please set repository path using \'docker.repository-path\' gradle property'
+                        + ' or \'DOCKER_REPOSITORY_PATH\' environemnt variable')
+            }
+
+            images.add("${repositoryPath}/${project.name}:${project.version}")
+        }
     }
-}
 
-tasks.register('pushTestsImage', com.bmuschko.gradle.docker.tasks.image.DockerPushImage) {
-    dependsOn = [buildTestsImage]
-    images = buildTestsImage.images
+    tasks.register('pushTestsImage', com.bmuschko.gradle.docker.tasks.image.DockerPushImage) {
+        dependsOn = [buildTestsImage]
+        images = buildTestsImage.images
 
-    doFirst {
-        def usernameVarKey = 'DOCKER_REGISTRY_USERNAME'
-        def passwordVarKey = 'DOCKER_REGISTRY_PASSWORD'
+        doFirst {
+            def usernameVarKey = 'DOCKER_REGISTRY_USERNAME'
+            def passwordVarKey = 'DOCKER_REGISTRY_PASSWORD'
 
-        def registryUsername = System.getenv(usernameVarKey)
-        def registryPassword = System.getenv(passwordVarKey)
+            def registryUsername = System.getenv(usernameVarKey)
+            def registryPassword = System.getenv(passwordVarKey)
 
-        if (registryUsername != null && registryPassword == null
-                || registryUsername == null && registryPassword != null) {
-            def args = registryUsername == null ? [passwordVarKey, usernameVarKey]
-                : [usernameVarKey, passwordVarKey]
-            throw new StopExecutionException("Environment variable ${args[0]} is set, but ${args[1]} is not.")
-        }
+            if (registryUsername != null && registryPassword == null || registryUsername == null && registryPassword != null) {
+                def args = registryUsername == null ? [passwordVarKey, usernameVarKey] : [usernameVarKey, passwordVarKey]
+                throw new StopExecutionException("Environment variable ${args[0]} is set, but ${args[1]} is not.")
+            }
 
-        registryCredentials {
-            url = getProperty('DOCKER_REGISTRY_URL', 'docker.registry-url')
-            username = registryUsername
-            password = registryPassword
+            registryCredentials {
+                url = getProperty('DOCKER_REGISTRY_URL', 'docker.registry-url')
+                username = registryUsername
+                password = registryPassword
+            }
         }
     }
+} else {
+    println 'Docker is not installed. Skipping Docker-dependent tasks: copyProjectLibrary, createTestsDockerfile, ' +
+            'buildTestsImage, pushTestsImage.'
 }
 
 def getProperty(String envVarName, String propertyName) {