Work done on the build script to check os and find out if docker is

available #8

lectures/build.gradle

@@ -112,4 +112,34 @@ revealjsPlugins {
     }*/
 }
 
+import org.apache.tools.ant.taskdefs.condition.Os
+
+task checkDocker {
+ 	doLast{
+ 	 	def result = 1
+	    if (Os.isFamily(Os.FAMILY_WINDOWS)) {
+	        println "*** WINDOWS "
+	            result = exec{
+		            def command = " "
+		            ignoreExitValue = true
+		            executable "docker" args "--version"
+		        }
+	        
+	    }else{
+		        result = exec{
+		            def command = "command -v docker"
+		            ignoreExitValue = true
+		            executable "bash" args "-l", "-c", command
+		        }
+		        
+	    }
+	    if(result.getExitValue()==0){
+            println "Has Docker"
+    	}else{
+        	print "No Docker"
+    	}
+    }
+}
+
 build.dependsOn 'asciidoctorRevealJs'
+