Add builder manager support (#308)

This change orchestrates function builds.

Environments (in v2) define a builder image, just like they do a runtime image. The builder image contains a build script that's invoked with source and deployment paths (as env vars).

The buildermgr watches for environments with build images defined, and creates build deployments and services.

Functions can define source and deployment. Buildermgr watches for functions with source code (and build status == pending) and invokes the environment's builder when appropriate. It captures logs from the build and sets the build status (success/failure) and build lots into the PackageStatus.

fission/environment.go

@@ -18,7 +18,6 @@ package main
 
 import (
 	"fmt"
-	"log"
 	"os"
 	"text/tabwriter"
 
@@ -42,12 +41,22 @@ func envCreate(c *cli.Context) error {
 		fatal("Need an image, use --image.")
 	}
 
+	envVersion := c.Int("version")
 	envBuilderImg := c.String("builder")
-
 	envBuildCmd := c.String("buildcmd")
-	if len(envBuilderImg) > 0 && len(envBuildCmd) == 0 {
-		log.Printf("No build command is specified, use the default build command.")
-		envBuildCmd = "build"
+
+	if len(envBuilderImg) > 0 {
+		envVersion = 2
+		if len(envBuildCmd) == 0 {
+			envBuildCmd = "build"
+		}
+	}
+
+	// Environment API interface version is not specified and
+	// builder image is empty, set default interface version
+	if envVersion == 0 {
+		fmt.Println("Use default environment v1 API interface")
+		envVersion = 1
 	}
 
 	env := &tpr.Environment{
@@ -56,7 +65,7 @@ func envCreate(c *cli.Context) error {
 			Namespace: api.NamespaceDefault,
 		},
 		Spec: fission.EnvironmentSpec{
-			Version: 1,
+			Version: envVersion,
 			Runtime: fission.Runtime{
 				Image: envImg,
 			},
@@ -121,6 +130,11 @@ func envUpdate(c *cli.Context) error {
 	if len(envImg) > 0 {
 		env.Spec.Runtime.Image = envImg
 	}
+
+	if env.Spec.Version == 1 && (len(envBuilderImg) > 0 || len(envBuildCmd) > 0) {
+		fatal("Environment v1 API interface doesn't supported environment builder.")
+	}
+
 	if len(envBuilderImg) > 0 {
 		env.Spec.Builder.Image = envBuilderImg
 	}