Allow Dockerfile language. Add imagemagick as sample.

Signed-off-by: Alex Ellis <[email protected]>

builder/build.go

@@ -15,18 +15,36 @@ func BuildImage(image string, handler string, functionName string, language stri
 	case "node", "python", "ruby", "csharp":
 		tempPath := createBuildTemplate(functionName, handler, language)
 
-		fmt.Printf("Building: %s with Docker. Please wait..\n", image)
+		fmt.Printf("Building: %s with %s template. Please wait..\n", image, language)
 
 		flagStr := buildFlagString(nocache, squash, os.Getenv("http_proxy"), os.Getenv("https_proxy"))
 
 		builder := strings.Split(fmt.Sprintf("docker build %s-t %s .", flagStr, image), " ")
 		fmt.Println(strings.Join(builder, " "))
 		ExecCommand(tempPath, builder)
+		fmt.Printf("Image: %s built.\n", image)
+
+		break
+	case "Dockerfile", "dockerfile":
+		tempPath := handler
+		if _, err := os.Stat(handler); err != nil {
+			fmt.Printf("Unable to build %s, %s is an invalid path\n", image, handler)
+			fmt.Printf("Image: %s not built.\n", image)
+
+			break
+		}
+		fmt.Printf("Building: %s with Dockerfile. Please wait..\n", image)
+
+		flagStr := buildFlagString(nocache, squash, os.Getenv("http_proxy"), os.Getenv("https_proxy"))
+
+		builder := strings.Split(fmt.Sprintf("docker build %s-t %s .", flagStr, image), " ")
+		fmt.Println(strings.Join(builder, " "))
+		ExecCommand(tempPath, builder)
+		fmt.Printf("Image: %s built.\n", image)
+
 	default:
 		log.Fatalf("Language template: %s not supported. Build a custom Dockerfile instead.", language)
 	}
-
-	fmt.Printf("Image: %s built.\n", image)
 }
 
 // createBuildTemplate creates temporary build folder to perform a Docker build with Node template

sample/imagemagick/Dockerfile

@@ -0,0 +1,11 @@
+FROM alpine:3.6
+
+# Alternatively use ADD https:// (which will not be cached by Docker builder)
+RUN apk --no-cache add curl ca-certificates imagemagick \ 
+    && echo "Pulling watchdog binary from Github." \
+    && curl -sSL https://github.com/alexellis/faas/releases/download/0.5.8-alpha/fwatchdog > /usr/bin/fwatchdog \
+    && chmod +x /usr/bin/fwatchdog
+
+ENV fprocess="convert - -resize 50% fd:1"
+
+CMD ["fwatchdog"]

samples.yml

@@ -16,7 +16,8 @@ functions:
 
   # curl localhost:8080/function/shrink-image --data-binary @big.png > smaller.png
   shrink-image:
-    skip_build: true  # this example is a binary, doesn't use a template
+    lang: Dockerfile
+    handler: ./sample/imagemagick
     image: functions/resizer
     fprocess: "convert - -resize 50% fd:1"