Simplify "dev dagger with dagger" example

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

dev.cue

@@ -1,8 +1,6 @@
 package main
 
 import (
-	"strings"
-
 	"dagger.io/dagger"
 	"dagger.io/alpine"
 )
@@ -10,13 +8,12 @@ import (
 // Dagger source code
 source: dagger.#Artifact
 
-// Go environment
-goenv: #Container & {
-	image: #ImageFromRef & {
-		ref: "docker.io/golang:1.16-alpine"
-	}
+build: #Container & {
+	image: #ImageFromRef & {ref: "docker.io/golang:1.16-alpine"}
 
-	setup: "apk add --no-cache file"
+	setup: [
+		"apk add --no-cache file",
+	]
 
 	volume: {
 		daggerSource: {
@@ -28,53 +25,31 @@ goenv: #Container & {
 			dest: "/root/.cache/gocache"
 		}
 	}
+
+	// Add go to search path (FIXME: should be inherited from image metadata)
+	shell: search: "/usr/local/go/bin": true
+
 	env: {
 		GOMODCACHE:  volume.goCache.dest
 		CGO_ENABLED: "0"
+	}
 
-		let pathPrefixes = ["/", "/usr/", "/usr/local/", "/usr/local/go/"]
-		PATH: strings.Join([
-			for prefix in pathPrefixes {prefix + "sbin"},
-			for prefix in pathPrefixes {prefix + "bin"},
-		], ":")
-	}
-	command: {
-		debug: {
-			args: ["env"]
-			always: true
-		}
-		test: {
 	dir:       "/src"
-			args: ["go", "test", "-v", "/src/..."]
-		}
-		build: {
-			dir: "/src"
-			args: ["go", "build", "-o", "/binaries/", "/src/cmd/..."]
 	outputDir: "/binaries"
-		}
-	}
+	command: """
+		go test -v ./...
+		go build -o /binaries/ ./cmd/...
+		"""
 }
 
-runner: #Container & {
-	image: alpine.#Image & {
-		package: make: true
-	}
+usage: #Container & {
+	image: alpine.#Image
 
-	volume: daggerBinaries: {
-		from: goenv.command.build
-		dest: "/usr/local/dagger/bin"
+	volume: binaries: {
+		from: build
+		dest: "/usr/local/dagger/bin/"
 	}
-	env: PATH: "/bin:/usr/bin:/usr/local/bin:/usr/local/dagger/bin"
+	shell: search: "/usr/local/dagger/bin": true
 
-	command: {
-		// Run `dagger help`
-		usage: args: ["dagger", "help"]
-		// FIXME: run integration tests
-
-		// Just a debug command to check that this config works
-		debug: {
-			args: ["env"]
-			env: FOO: "BAR"
-		}
-	}
+	command: "dagger help"
 }

docker.cue

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"strings"
+
 	"dagger.io/dagger"
 	"dagger.io/dagger/op"
 )
@@ -41,8 +43,8 @@ import (
 
 	image: dagger.#Artifact
 
-	// Optional setup script
-	setup: string | *null
+	// Optional setup scripts
+	setup: [...string]
 
 	// Environment variables shared by all commands
 	env: [string]: string
@@ -62,17 +64,30 @@ import (
 		}
 	}
 
-	command: [name=string]: {
-		args: [...string]
-		dir:   string | *"/"
-		"env": env & {
-			[string]: string
+	shell: {
+		path: string | *"/bin/sh"
+		args: [...string] | *["-c"]
+		search: [string]: bool
+		search: {
+			"/sbin":           true
+			"/bin":            true
+			"/usr/sbin":       true
+			"/usr/bin":        true
+			"/usr/local/sbin": true
+			"/usr/local/bin":  true
 		}
+	}
+	env: PATH: string | *strings.Join([ for p, v in shell.search if v {p}], ":")
+
+	command: string
+
+	dir: string | *"/"
+
+	env: [string]: string
+
 	outputDir: string | *"/"
 	always:    true | *false
 
-		// Execute each command in a pristine filesystem state
-		// (commands do not interfere with each other's changes)
 	#up: [
 		op.#Load & {from: image},
 		// Copy volumes with type=copy
@@ -83,15 +98,10 @@ import (
 				src:  v.source
 			}
 		},
-			// Execute setup script
-			if setup != null {
+		// Execute setup commands, then main command
+		for cmd in setup + [command] {
 			op.#Exec & {
-					"env": env
-					args: ["/bin/sh", "-c", setup]
-				}
-			},
-			op.#Exec & {
-				"args":   args
+				args:     [shell.path] + shell.args + [cmd]
 				"env":    env
 				"dir":    dir
 				"always": always
@@ -109,11 +119,10 @@ import (
 						}
 					}
 				}
+			}
 		},
 		op.#Subdir & {
 			dir: outputDir
 		},
 	]
-	}
-
 }

stdlib/docker/docker.cue

@@ -5,6 +5,8 @@ import (
 	"dagger.io/dagger/op"
 )
 
+#Image: dagger.#Artifact
+
 #Ref: string
 
 // Build a docker container image