Move prototype 69-dagger-archon to top-level

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

Dockerfile

@@ -0,0 +1,12 @@
+# syntax = docker/dockerfile-upstream:experimental@sha256:398a0a10f19875add7fe359a37f2f971c46746b064faf876776ae632a3472c37
+
+FROM golang:1.14-alpine AS build
+WORKDIR /src
+RUN apk add --no-cache file
+RUN --mount=target=. --mount=target=/root/.cache,type=cache \
+    CGO_ENABLED=0 go build -o /out/dagger ./cmd/dagger-frontend && file /out/dagger | grep "statically linked"
+
+FROM scratch
+COPY --from=build /out/dagger /bin/dagger
+ENTRYPOINT ["/bin/dagger"]
+

Makefile

@@ -0,0 +1,3 @@
+.PHONY: dagger
+dagger:
+	go generate ./dagger && go build -o ./cmd/dagger/ ./cmd/dagger/

README.md

@@ -0,0 +1,63 @@
+# Prototype 69-dagger-archon
+
+This is an improved version of 64-blagger with the cuellb pattern, using
+everything we learned in 64,64,66.
+
+This prototype marks a strong convergence between SH and AL on the high-level DX and architecture
+of the future OSS project. The next step is to get to a working POC implementation together,
+that can run a configuration written by SA, end-to-end, and make SA happy with the DX :)
+
+## Points of convergence:
+
+### 1. Cue DX: the cuellb pattern
+
+The "cuellb" pattern is a promising DX for writing delivery workflows in Cue.
+On the one hand, the raw arrays are verbose, but they are easy to understand. And they
+can be abstracted away by the community as they wish, using the native features of Cue.
+TO quote AL: "It's easier to take something verbose and simple, and make it less verbose,
+than to take something concise and complex, and make it simple."
+
+### 2. Integration of SAAS features: runtime+engine
+
+The OSS project must combine features from 3 codebases: `bl-runtime`, `bl-api`, and `bl`.
+And it must combine them in a way that allows maximum code sharing between SAAS and OSS,
+so we don't have to do everything twice.
+
+So in addition to defining a Cue DX and runtime, we also need to define how `dagger` will
+implement (or avoid implementing) saas features like settings, secrets, connectors, stacks,
+envs, slugs, job history, provider catalog, etc.
+
+A  promising approach to do this is to split the OSS project in 2 components:
+
+- 1) the runtime which loads and executes cue confiurations, and
+- 2) the engine which orchestrates the runtime, and all its inputs and outputs: config repositories,
+settings, dependencies, previous state, execution history, etc.
+The engine is also responsible for end-user interaction.
+(see 64-blagger/README.md for more details on this architecture).
+
+### 3. Possible performance gains
+
+One consequence of the cuellb model + engine/runtime split, is that it becomes possible (we think)
+to compile a dagger job to a single LLB slug, and run it once.
+This has several benefits, including making the runtime simpler, and removing the hard dependency
+on a registry (which opens the door to new use cases in local development).
+
+One possible benefit is performance. In theory, single-pass llb compilation is automatically faster
+because it removes the multiple round-trips between 1) cue eval 2) buildkit run 3) registry push 4) registry pull.
+The larger the configuration, the more round-trips, and the bigger the potential performance gain in dagger.
+
+*[SH]* I have done lots of research work on this (prototypes 64-68) and the results are very encouraiging.
+I have strong conviction that the performance benefits are huge. But I only have bits and pieces of POC implementations,
+each focusing on a small aspect of the problem. The next step is to implement an end-to-end POC, and run a crude benchmark.
+
+
+### 4. Next step: working end-to-end prototype
+
+We agree on a possible high-level architecture, DX and UX, built on several hypothesis:
+is cuellb really a good DX in practice? can dir refs really be eliminated?
+is single-pass llb jit really feasible, and if so does it solve our performance issues?
+how easy will it be to port Blocklayer to dagger? How much work to migrate beta users?
+
+Now is the time to test these hypothesis with a working end-to-end implementation.
+There are many remaining questions but we have enough alignment to find the answers
+together.

cmd/dagger-frontend/main.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"dagger.cloud/go/dagger"
+	"github.com/moby/buildkit/frontend/gateway/grpcclient"
+	"github.com/moby/buildkit/util/appcontext"
+)
+
+func main() {
+	r := &dagger.Runtime{}
+	if err := grpcclient.RunFromEnvironment(appcontext.Context(), r.BKFrontend); err != nil {
+		panic(err)
+	}
+}

cmd/dagger/.gitignore

@@ -0,0 +1,2 @@
+dagger
+.dagger

cmd/dagger/cmd/compute.go

@@ -0,0 +1,50 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"dagger.cloud/go/dagger"
+	"dagger.cloud/go/dagger/ui"
+	"github.com/spf13/cobra"
+)
+
+var computeCmd = &cobra.Command{
+	Use:   "compute CONFIG",
+	Short: "Compute a configuration",
+	Args:  cobra.ExactArgs(1),
+	Run: func(cmd *cobra.Command, args []string) {
+		ctx := context.TODO()
+		c, err := dagger.NewClient(ctx, "")
+		if err != nil {
+			ui.Fatal(err)
+		}
+		target := args[0]
+		if target == "-" {
+			ui.Info("Assembling config from stdin\n")
+			// FIXME: include cue.mod/pkg from *somewhere* so stdin config can import
+			if err := c.SetConfig(os.Stdin); err != nil {
+				ui.Fatal(err)
+			}
+		} else {
+			ui.Info("Assembling config from %q\n", target)
+			if err := c.SetConfig(target); err != nil {
+				ui.Fatal(err)
+			}
+		}
+		ui.Info("Running")
+		output, err := c.Run(ctx, "compute")
+		if err != nil {
+			ui.Fatal(err)
+		}
+		ui.Info("Processing output")
+		//		output.Print(os.Stdout)
+		fmt.Println(output.JSON())
+		// FIXME: write computed values back to env dir
+	},
+}
+
+func init() {
+	//	computeCmd.Flags().StringP("catalog", "c", "", "Cue package catalog")
+}

cmd/dagger/cmd/create.go

@@ -0,0 +1,35 @@
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"dagger.cloud/go/dagger/ui"
+	"github.com/spf13/cobra"
+)
+
+var createCmd = &cobra.Command{
+	Use:   "create ENV BASE",
+	Short: "Create an env",
+	Args:  cobra.ExactArgs(2),
+	Run: func(cmd *cobra.Command, args []string) {
+		envname := args[0]
+		base := args[1]
+		envdir := ".dagger/env/" + envname
+		if info, err := os.Stat(envdir); err == nil {
+			if info.IsDir() {
+				ui.Fatalf("env already exists: %s", envname)
+			}
+		}
+		if err := os.MkdirAll(envdir, 0755); err != nil {
+			ui.Fatal(err)
+		}
+		baseCue := fmt.Sprintf("package env\nimport base \"%s\"\nbase\n", base)
+		err := ioutil.WriteFile(envdir+"/base.cue", []byte(baseCue), 0644)
+		if err != nil {
+			ui.Fatal(err)
+		}
+		ui.Info("created environment %q with base %q", envname, base)
+	},
+}

cmd/dagger/cmd/root.go

@@ -0,0 +1,37 @@
+package cmd
+
+import (
+	"dagger.cloud/go/dagger/ui"
+	"github.com/spf13/cobra"
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "dagger",
+	Short: "Open-source workflow engine",
+}
+
+func init() {
+	// --debug
+	rootCmd.PersistentFlags().Bool("debug", false, "Enable debug mode")
+	// --workspace
+	rootCmd.PersistentFlags().StringP("workspace", "w", "", "Select workspace")
+	rootCmd.AddCommand(
+		// Create an env
+		createCmd,
+		computeCmd,
+		// Change settings on an env
+		// View or edit env serti
+		//		settingsCmd,
+		// Query the state of an env
+		//		getCmd,
+		//		unsetCmd,
+		//		computeCmd,
+		//		listCmd,
+	)
+}
+
+func Execute() {
+	if err := rootCmd.Execute(); err != nil {
+		ui.Fatal(err)
+	}
+}

cmd/dagger/main.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	"dagger.cloud/go/cmd/dagger/cmd"
+)
+
+func main() {
+	cmd.Execute()
+}

dagger/client.go

@@ -0,0 +1,434 @@
+package dagger
+
+import (
+	"archive/tar"
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/pkg/errors"
+	"golang.org/x/sync/errgroup"
+
+	// Cue
+	"cuelang.org/go/cue"
+	cueerrors "cuelang.org/go/cue/errors"
+	cueformat "cuelang.org/go/cue/format"
+
+	// buildkit
+	bk "github.com/moby/buildkit/client"
+	_ "github.com/moby/buildkit/client/connhelper/dockercontainer"
+	"github.com/moby/buildkit/client/llb"
+	bkgw "github.com/moby/buildkit/frontend/gateway/client"
+
+	// docker output
+	"github.com/containerd/console"
+	"github.com/moby/buildkit/util/progress/progressui"
+)
+
+const (
+	defaultBuildkitHost = "docker-container://buildkitd"
+
+	bkConfigKey = "context"
+	bkInputKey  = ":dagger:input:"
+	bkActionKey = ":dagger:action:"
+)
+
+type Client struct {
+	c *bk.Client
+
+	inputs    map[string]llb.State
+	localdirs map[string]string
+
+	BKFrontend bkgw.BuildFunc
+}
+
+func NewClient(ctx context.Context, host string) (*Client, error) {
+	// buildkit client
+	if host == "" {
+		host = os.Getenv("BUILDKIT_HOST")
+	}
+	if host == "" {
+		host = defaultBuildkitHost
+	}
+	c, err := bk.New(ctx, host)
+	if err != nil {
+		return nil, errors.Wrap(err, "buildkit client")
+	}
+	return &Client{
+		c:         c,
+		inputs:    map[string]llb.State{},
+		localdirs: map[string]string{},
+	}, nil
+}
+
+func (c *Client) ConnectInput(target string, input interface{}) error {
+	var st llb.State
+	switch in := input.(type) {
+	case llb.State:
+		st = in
+	case string:
+		// Generate a random local input label for security
+		st = c.AddLocalDir(in, target)
+	default:
+		return fmt.Errorf("unsupported input type")
+	}
+	c.inputs[bkInputKey+target] = st
+	return nil
+}
+
+func (c *Client) AddLocalDir(dir, label string, opts ...llb.LocalOption) llb.State {
+	c.localdirs[label] = dir
+	return llb.Local(label, opts...)
+}
+
+// Set cue config for future calls.
+// input can be:
+//   - llb.State: valid cue config directory
+//   - io.Reader: valid cue source
+//   - string: local path to valid cue file or directory
+//   - func(llb.State)llb.Stte: modify existing state
+
+func (c *Client) SetConfig(inputs ...interface{}) error {
+	for _, input := range inputs {
+		if err := c.setConfig(input); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (c *Client) setConfig(input interface{}) error {
+	var st llb.State
+	switch in := input.(type) {
+	case llb.State:
+		st = in
+	case func(llb.State) llb.State:
+		// Modify previous state
+		last, ok := c.inputs[bkConfigKey]
+		if !ok {
+			last = llb.Scratch()
+		}
+		st = in(last)
+	case io.Reader:
+		contents, err := ioutil.ReadAll(in)
+		if err != nil {
+			return err
+		}
+		st = llb.Scratch().File(llb.Mkfile(
+			"config.cue",
+			0660,
+			contents,
+		))
+	// Interpret string as a path (dir or file)
+	case string:
+		info, err := os.Stat(in)
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			// FIXME: include pattern *.cue ooh yeah
+			st = c.AddLocalDir(in, "config",
+				//llb.IncludePatterns([]string{"*.cue", "cue.mod"})),
+				llb.FollowPaths([]string{"*.cue", "cue.mod"}),
+			)
+		} else {
+			f, err := os.Open(in)
+			if err != nil {
+				return err
+			}
+			defer f.Close()
+			return c.SetConfig(f)
+		}
+	}
+	c.inputs[bkConfigKey] = st
+	return nil
+}
+
+func (c *Client) Run(ctx context.Context, action string) (*Output, error) {
+	// Spawn Build() goroutine
+	eg, ctx := errgroup.WithContext(ctx)
+	events := make(chan *bk.SolveStatus)
+	outr, outw := io.Pipe()
+	// Spawn build function
+	eg.Go(c.buildfn(ctx, action, events, outw))
+	// Spawn print function(s)
+	dispCtx := context.TODO()
+	var eventsdup chan *bk.SolveStatus
+	if os.Getenv("DOCKER_OUTPUT") != "" {
+		eventsdup = make(chan *bk.SolveStatus)
+		eg.Go(c.dockerprintfn(dispCtx, eventsdup, os.Stderr))
+	}
+	eg.Go(c.printfn(dispCtx, events, eventsdup))
+	// Retrieve output
+	out := NewOutput()
+	eg.Go(c.outputfn(ctx, outr, out))
+	return out, eg.Wait()
+}
+
+func (c *Client) buildfn(ctx context.Context, action string, ch chan *bk.SolveStatus, w io.WriteCloser) func() error {
+	return func() error {
+		defer debugf("buildfn complete")
+		// Setup solve options
+		opts := bk.SolveOpt{
+			FrontendAttrs: map[string]string{
+				bkActionKey: action,
+			},
+			LocalDirs:      c.localdirs,
+			FrontendInputs: c.inputs,
+			// FIXME: catch output & return as cue value
+			Exports: []bk.ExportEntry{
+				{
+					Type: bk.ExporterTar,
+					Output: func(m map[string]string) (io.WriteCloser, error) {
+						return w, nil
+					},
+				},
+			},
+		}
+		// Setup frontend
+		bkFrontend := c.BKFrontend
+		if bkFrontend == nil {
+			r := &Runtime{}
+			bkFrontend = r.BKFrontend
+		}
+		resp, err := c.c.Build(ctx, opts, "", bkFrontend, ch)
+		if err != nil {
+			// Close exporter pipe so that export processor can return
+			w.Close()
+			err = errors.New(bkCleanError(err.Error()))
+			return errors.Wrap(err, "buildkit solve")
+		}
+		for k, v := range resp.ExporterResponse {
+			// FIXME consume exporter response
+			fmt.Printf("exporter response: %s=%s\n", k, v)
+		}
+		return nil
+	}
+}
+
+// Read tar export stream from buildkit Build(), and extract cue output
+func (c *Client) outputfn(ctx context.Context, r io.Reader, out *Output) func() error {
+	return func() error {
+		defer debugf("outputfn complete")
+		tr := tar.NewReader(r)
+		for {
+			debugf("outputfn: reading next tar entry")
+			h, err := tr.Next()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return errors.Wrap(err, "read tar stream")
+			}
+			if !strings.HasSuffix(h.Name, ".cue") {
+				debugf("skipping non-cue file from exporter tar stream: %s", h.Name)
+				continue
+			}
+			debugf("outputfn: compiling & merging %q", h.Name)
+			// FIXME: only doing this for debug. you can pass tr directly as io.Reader.
+			contents, err := ioutil.ReadAll(tr)
+			if err != nil {
+				return err
+			}
+			//if err := out.FillSource(h.Name, tr); err != nil {
+			if err := out.FillSource(h.Name, contents); err != nil {
+				debugf("error with %s: contents=\n------\n%s\n-----\n", h.Name, contents)
+				return errors.Wrap(err, h.Name)
+			}
+			debugf("outputfn: DONE: compiling & merging %q", h.Name)
+		}
+		return nil
+	}
+}
+
+// Status of a node in the config tree being computed
+// Node may be a component, or a value within a component
+// (eg. a script or individual operation in a script)
+type Node struct {
+	Path cue.Path
+	*bk.Vertex
+}
+
+func (n Node) ComponentPath() cue.Path {
+	var parts []cue.Selector
+	for _, sel := range n.Path.Selectors() {
+		if strings.HasPrefix(sel.String(), "#") {
+			break
+		}
+		parts = append(parts, sel)
+	}
+	return cue.MakePath(parts...)
+}
+
+func (n Node) Logf(msg string, args ...interface{}) {
+	componentPath := n.ComponentPath().String()
+	args = append([]interface{}{componentPath}, args...)
+	if msg != "" && !strings.HasSuffix(msg, "\n") {
+		msg += "\n"
+	}
+	fmt.Fprintf(os.Stderr, "[%s] "+msg, args...)
+}
+
+func (n Node) LogStream(nStream int, data []byte) {
+	var stream string
+	switch nStream {
+	case 1:
+		stream = "stdout"
+	case 2:
+		stream = "stderr"
+	default:
+		stream = fmt.Sprintf("%d", nStream)
+	}
+	// FIXME: use bufio reader?
+	lines := strings.Split(string(data), "\n")
+	for _, line := range lines {
+		n.Logf("[%s] %s", stream, line)
+	}
+}
+
+func (n Node) LogError(errmsg string) {
+	n.Logf("ERROR: %s", bkCleanError(errmsg))
+}
+
+func (c *Client) printfn(ctx context.Context, ch, ch2 chan *bk.SolveStatus) func() error {
+	return func() error {
+		// Node status mapped to buildkit vertex digest
+		nodesByDigest := map[string]*Node{}
+		// Node status mapped to cue path
+		nodesByPath := map[string]*Node{}
+
+		defer debugf("printfn complete")
+		if ch2 != nil {
+			defer close(ch2)
+		}
+		ticker := time.NewTicker(150 * time.Millisecond)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			case <-ticker.C:
+			case status, ok := <-ch:
+				if !ok {
+					return nil
+				}
+				if ch2 != nil {
+					ch2 <- status
+				}
+				debugf("status event: vertexes:%d statuses:%d logs:%d\n",
+					len(status.Vertexes),
+					len(status.Statuses),
+					len(status.Logs),
+				)
+				for _, v := range status.Vertexes {
+					p := cue.ParsePath(v.Name)
+					if err := p.Err(); err != nil {
+						debugf("ignoring buildkit vertex %q: not a valid cue path", p.String())
+						continue
+					}
+					n := &Node{
+						Path:   p,
+						Vertex: v,
+					}
+					nodesByPath[n.Path.String()] = n
+					nodesByDigest[n.Digest.String()] = n
+					if n.Error != "" {
+						n.LogError(n.Error)
+					}
+				}
+				for _, log := range status.Logs {
+					if n, ok := nodesByDigest[log.Vertex.String()]; ok {
+						n.LogStream(log.Stream, log.Data)
+					}
+				}
+				// debugJSON(status)
+				// FIXME: callbacks for extracting stream/result
+				// see proto 67
+			}
+		}
+		return nil
+	}
+}
+
+// A helper to remove noise from buildkit error messages.
+// FIXME: Obviously a cleaner solution would be nice.
+func bkCleanError(msg string) string {
+	noise := []string{
+		"executor failed running ",
+		"buildkit-runc did not terminate successfully",
+		"rpc error: code = Unknown desc =",
+		"failed to solve: ",
+	}
+	for _, s := range noise {
+		msg = strings.Replace(msg, s, "", -1)
+	}
+	return msg
+}
+
+func (c *Client) dockerprintfn(ctx context.Context, ch chan *bk.SolveStatus, out io.Writer) func() error {
+	return func() error {
+		defer debugf("dockerprintfn complete")
+		var cons console.Console
+		// FIXME: use smarter writer from blr
+		return progressui.DisplaySolveStatus(ctx, "", cons, out, ch)
+	}
+}
+
+type Output struct {
+	r    *cue.Runtime
+	inst *cue.Instance
+}
+
+func NewOutput() *Output {
+	r := &cue.Runtime{}
+	inst, _ := r.Compile("", "")
+	return &Output{
+		r:    r,
+		inst: inst,
+	}
+}
+
+func (o *Output) Print(w io.Writer) error {
+	v := o.Cue().Value().Eval()
+	b, err := cueformat.Node(v.Syntax())
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(b)
+	return err
+}
+
+func (o *Output) JSON() JSON {
+	return cueToJSON(o.Cue().Value())
+}
+
+func (o *Output) Cue() *cue.Instance {
+	return o.inst
+}
+
+func (o *Output) FillSource(filename string, x interface{}) error {
+	inst, err := o.r.Compile(filename, x)
+	if err != nil {
+		return fmt.Errorf("compile %s: %s", filename, cueerrors.Details(err, nil))
+	}
+	if err := o.FillValue(inst.Value()); err != nil {
+		return fmt.Errorf("merge %s: %s", filename, cueerrors.Details(err, nil))
+	}
+	return nil
+}
+
+func (o *Output) FillValue(x interface{}) error {
+	inst, err := o.inst.Fill(x)
+	if err != nil {
+		return err
+	}
+	if err := inst.Value().Validate(); err != nil {
+		return err
+	}
+	o.inst = inst
+	return nil
+}

dagger/gen.go

@@ -0,0 +1,158 @@
+package dagger
+
+// Generated by gen.sh. DO NOT EDIT.
+
+var DaggerSpec = `
+package dagger
+
+// A DAG is the basic unit of programming in dagger.
+// It is a special kind of program which runs as a pipeline of computing nodes running in parallel,
+// instead of a sequence of operations to be run by a single node.
+//
+// It is a powerful way to automate various parts of an application delivery workflow:
+// build, test, deploy, generate configuration, enforce policies, publish artifacts, etc.
+//
+// The DAG architecture has many benefits:
+//  - Because DAGs are made of nodes executing in parallel, they are easy to scale.
+//  - Because all inputs and outputs are snapshotted and content-addressed, DAGs
+//		can easily be made repeatable, can be cached aggressively, and can be replayed
+//		at will.
+//  - Because nodes are executed by the same container engine as docker-build, DAGs
+//		can be developed using any language or technology capable of running in a docker.
+//		Dockerfiles and docker images are natively supported for maximum compatibility.
+//
+//  - Because DAGs are programmed declaratively with a powerful configuration language,
+//		they are much easier to test, debug and refactor than traditional programming languages.
+//
+// To execute a DAG, the dagger runtime JIT-compiles it to a low-level format called
+// llb, and executes it with buildkit.
+// Think of buildkit as a specialized VM for running compute graphs; and dagger as
+// a complete programming environment for that VM.
+//
+// The tradeoff for all those wonderful features is that a DAG architecture cannot be used
+// for all software: only software than can be run as a pipeline.
+//
+
+// A dagger component is a configuration value augmented
+// by scripts defining how to compute it, present it to a user,
+// encrypt it, etc.
+
+// FIXME: #Component will not match embedded scalars.
+//   use Runtime.isComponent() for a reliable check
+#Component: {
+	#dagger: #ComponentConfig
+	...
+}
+
+// The contents of a #dagger annotation
+#ComponentConfig: {
+	input?: bool
+
+	// script to compute the value
+	compute?:  #Script
+
+	terminal?: {
+		// Display a message when opening a terminal session
+		greeting?: string
+		command: [string]: #Script
+	}
+	// Configure how the component is incorporated to user settings.
+	// Configure how the end-user can configure this component
+	settings?: {
+		// If not specified, scrape from comments
+		title?:       string
+		description?: string
+		// Disable user input, even if incomplete?
+		hidden: true | *false
+		ui:     _ // insert here something which can be compiled to react-jsonschema-form
+		// Show the cue default value to the user, as a default input value?
+		showDefault: true | *false
+
+		// Insert information needed by:
+		//   1) clients to encrypt
+		//  ie. web wizard, cli
+		//   2) middleware to implement deicphering in the cuellb pipeline
+		//  eg. integration with clcoud KMS, Vault...
+		//
+		//   3) connectors to make sure secrets are preserved 
+		encrypt?: {
+			pubkey: string
+			cipher: string
+		}
+	}
+}
+
+
+
+// Any component can be referenced as a directory, since
+// every dagger script outputs a filesystem state (aka a directory)
+#Dir: #Component
+
+#Script: [...#Op]
+
+// One operation in a script
+#Op: #FetchContainer | #FetchGit | #Export | #Exec | #Load | #Copy
+
+// Export a value from fs state to cue
+#Export: {
+	do: "export"
+	// Source path in the container
+	source: string
+	format: "json"|"yaml"|*"string"|"number"|"boolean"
+}
+
+#Load: #LoadComponent| #LoadScript
+#LoadComponent: {
+	do: "load"
+	from: #Component
+}
+#LoadScript: {
+	do: "load"
+	from: #Script
+}
+
+
+#Exec: {
+	do: "exec"
+	args: [...string]
+	env: [string]: string
+	always: true | *false
+	dir: string | *"/"
+	mount?: [string]: #MountTmp | #MountCache | #MountComponent | #MountScript
+}
+
+#MountTmp: "tmpfs"
+#MountCache: "cache"
+#MountComponent: {
+	input: #Component
+	path: string | *"/"
+}
+#MountScript: {
+	input: #Script
+	path: string | *"/"
+}
+
+#FetchContainer: {
+	do: "fetch-container"
+	ref: string
+}
+
+#FetchGit: {
+	do: "fetch-git"
+	remote: string
+	ref: string
+}
+
+#Copy: {
+	do: "copy"
+	from: #Script | #Component
+	src: string | *"/"
+	dest: string | *"/"
+}
+
+
+#TestScript: #Script & [
+	{ do: "fetch-container", ref: "alpine:latest" },
+	{ do: "exec", args: ["echo", "hello", "world" ] }
+]
+`

dagger/gen.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+cue eval spec.cue >/dev/null
+(
+cat <<'EOF'
+package dagger
+
+// Generated by gen.sh. DO NOT EDIT.
+
+var DaggerSpec = `
+EOF
+cat spec.cue
+cat <<'EOF'
+`
+EOF
+) > gen.go

dagger/job.go

@@ -0,0 +1,326 @@
+package dagger
+
+import (
+	"context"
+	"fmt"
+	"path"
+	"path/filepath"
+	"strings"
+
+	"cuelang.org/go/cue"
+	cueerrors "cuelang.org/go/cue/errors"
+	cueload "cuelang.org/go/cue/load"
+	cueflow "cuelang.org/go/tools/flow"
+	"github.com/moby/buildkit/client/llb"
+	bkgw "github.com/moby/buildkit/frontend/gateway/client"
+	"github.com/pkg/errors"
+)
+
+type Solver interface {
+	Solve(context.Context, llb.State) (bkgw.Reference, error)
+}
+
+// 1 buildkit build = 1 job
+type Job struct {
+	c bkgw.Client
+	// needed for cue operations
+	r *Runtime
+}
+
+// Execute and wrap the result in a buildkit result
+func (job Job) BKExecute(ctx context.Context) (_r *bkgw.Result, _e error) {
+	debugf("Executing bk frontend")
+	// wrap errors to avoid crashing buildkit with cue error types (why??)
+	defer func() {
+		if _e != nil {
+			_e = fmt.Errorf("%s", cueerrors.Details(_e, nil))
+			debugf("execute returned an error. Wrapping...")
+		}
+	}()
+	out, err := job.Execute(ctx)
+	if err != nil {
+		return nil, err
+	}
+	// encode job output to buildkit result
+	debugf("[runtime] job executed. Encoding output")
+	// FIXME: we can't serialize result to standalone cue (with no imports).
+	// So the client cannot safely compile output without access to the same cue.mod
+	// as the runtime (which we don't want).
+	// So for now we return the output as json, still parsed as cue on the client
+	// to keep our options open. Once there is a "tree shake" primitive, we can
+	// use that to return cue.
+	//
+	// Uncomment to return actual cue:
+	// ----
+	// outbytes, err := cueformat.Node(out.Value().Eval().Syntax())
+	// if err != nil {
+	// 	return nil, err
+	// }
+	// ----
+	outbytes := cueToJSON(out.Value())
+	debugf("[runtime] output encoded. Writing output to exporter")
+	outref, err := job.Solve(ctx,
+		llb.Scratch().File(llb.Mkfile("computed.cue", 0600, outbytes)),
+	)
+	if err != nil {
+		return nil, err
+	}
+	debugf("[runtime] output written to exporter. returning to buildkit solver")
+	res := bkgw.NewResult()
+	res.SetRef(outref)
+	return res, nil
+}
+
+func (job Job) Execute(ctx context.Context) (_i *cue.Instance, _e error) {
+	debugf("[runtime] Execute()")
+	defer func() { debugf("[runtime] DONE Execute(): err=%v", _e) }()
+	state, err := job.Config(ctx)
+	if err != nil {
+		return nil, err
+	}
+	// Merge input information into the cue config
+	inputs, err := job.Inputs(ctx)
+	if err != nil {
+		return nil, err
+	}
+	for target := range inputs {
+		// FIXME: cleaner code generation, missing cue.Value.FillPath
+		state, err = job.r.fill(state, `#dagger: input: true`, target)
+		if err != nil {
+			return nil, errors.Wrapf(err, "connect input %q", target)
+		}
+	}
+	action := job.Action()
+	switch action {
+	case "compute":
+		return job.doCompute(ctx, state)
+	case "export":
+		return job.doExport(ctx, state)
+	default:
+		return job.doExport(ctx, state)
+	}
+}
+
+func (job Job) doExport(ctx context.Context, state *cue.Instance) (*cue.Instance, error) {
+	return state, nil
+}
+
+func (job Job) doCompute(ctx context.Context, state *cue.Instance) (*cue.Instance, error) {
+	out, err := job.r.Compile("computed.cue", "")
+	if err != nil {
+		return nil, err
+	}
+	// Setup cueflow
+	debugf("Setting up cueflow")
+	flow := cueflow.New(
+		&cueflow.Config{
+			UpdateFunc: func(c *cueflow.Controller, t *cueflow.Task) error {
+				debugf("cueflow event")
+				if t == nil {
+					return nil
+				}
+				debugf("cueflow task %q: %s", t.Path().String(), t.State().String())
+				if t.State() == cueflow.Terminated {
+					debugf("cueflow task %q: filling result", t.Path().String())
+					out, err = out.Fill(t.Value(), cuePathToStrings(t.Path())...)
+					if err != nil {
+						return err
+					}
+					// FIXME: catch merge errors early with state
+				}
+				return nil
+			},
+		},
+		state,
+		// Task match func
+		func(v cue.Value) (cueflow.Runner, error) {
+			// Is v a component (has #dagger) with a field 'compute' ?
+			isComponent, err := job.r.isComponent(v, "compute")
+			if err != nil {
+				return nil, err
+			}
+			if !isComponent {
+				return nil, nil
+			}
+			debugf("[%s] component detected\n", v.Path().String())
+			// task runner func
+			runner := cueflow.RunnerFunc(func(t *cueflow.Task) error {
+				computeScript := t.Value().LookupPath(cue.ParsePath("#dagger.compute"))
+				script, err := job.newScript(computeScript)
+				if err != nil {
+					return err
+				}
+				// Run the script & fill the result into the task
+				return script.Run(ctx, t)
+			})
+			return runner, nil
+		},
+	)
+	debugf("Running cueflow")
+	if err := flow.Run(ctx); err != nil {
+		return nil, err
+	}
+	debugf("Completed cueflow run. Merging result.")
+	state, err = state.Fill(out)
+	if err != nil {
+		return nil, err
+	}
+	debugf("Result merged")
+	// Return only the computed values
+	return out, nil
+}
+
+func (job Job) bk() bkgw.Client {
+	return job.c
+}
+
+func (job Job) Action() string {
+	opts := job.bk().BuildOpts().Opts
+	if action, ok := opts[bkActionKey]; ok {
+		return action
+	}
+	return ""
+}
+
+// Load the cue config for this job
+// (received as llb input)
+func (job Job) Config(ctx context.Context) (*cue.Instance, error) {
+	src := llb.Local(bkConfigKey,
+		llb.SessionID(job.bk().BuildOpts().SessionID),
+		llb.SharedKeyHint(bkConfigKey),
+		llb.WithCustomName("load config"),
+	)
+
+	bkInputs, err := job.bk().Inputs(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if st, ok := bkInputs[bkConfigKey]; ok {
+		src = st
+	}
+	// job.runDebug(ctx, src, "ls", "-la", "/mnt")
+	return job.LoadCue(ctx, src)
+}
+
+func (job Job) runDebug(ctx context.Context, mnt llb.State, args ...string) error {
+	opts := []llb.RunOption{
+		llb.Args(args),
+		llb.AddMount("/mnt", mnt),
+	}
+	cmd := llb.Image("alpine").Run(opts...).Root()
+	ref, err := job.Solve(ctx, cmd)
+	if err != nil {
+		return errors.Wrap(err, "debug")
+	}
+	// force non-lazy solve
+	if _, err := ref.ReadDir(ctx, bkgw.ReadDirRequest{Path: "/"}); err != nil {
+		return errors.Wrap(err, "debug")
+	}
+	return nil
+}
+
+func (job Job) Inputs(ctx context.Context) (map[string]llb.State, error) {
+	bkInputs, err := job.bk().Inputs(ctx)
+	if err != nil {
+		return nil, err
+	}
+	inputs := map[string]llb.State{}
+	for key, input := range bkInputs {
+		if !strings.HasPrefix(key, bkInputKey) {
+			continue
+		}
+		target := strings.Replace(key, bkInputKey, "", 1)
+		targetPath := cue.ParsePath(target)
+		if err := targetPath.Err(); err != nil {
+			return nil, errors.Wrapf(err, "input target %q", target)
+		}
+		// FIXME: check that the path can be passed to Fill
+		//  (eg. only regular fields, no array indexes, no defs)
+		// see cuePathToStrings
+		inputs[target] = input
+	}
+	return inputs, nil
+}
+
+// loadFiles recursively loads all .cue files from a buildkit gateway
+// FIXME: this is highly inefficient.
+func loadFiles(ctx context.Context, ref bkgw.Reference, p, overlayPrefix string, overlay map[string]cueload.Source) error {
+	// FIXME: we cannot use `IncludePattern` here, otherwise sub directories
+	// (e.g. "cue.mod") will be skipped.
+	files, err := ref.ReadDir(ctx, bkgw.ReadDirRequest{
+		Path: p,
+	})
+	if err != nil {
+		return err
+	}
+	for _, f := range files {
+		fPath := path.Join(p, f.GetPath())
+		if f.IsDir() {
+			if err := loadFiles(ctx, ref, fPath, overlayPrefix, overlay); err != nil {
+				return err
+			}
+			continue
+		}
+
+		if filepath.Ext(fPath) != ".cue" {
+			continue
+		}
+
+		contents, err := ref.ReadFile(ctx, bkgw.ReadRequest{
+			Filename: fPath,
+		})
+		if err != nil {
+			return errors.Wrap(err, f.GetPath())
+		}
+		overlay[path.Join(overlayPrefix, fPath)] = cueload.FromBytes(contents)
+	}
+
+	return nil
+}
+
+func (job Job) LoadCue(ctx context.Context, st llb.State, args ...string) (*cue.Instance, error) {
+	// The CUE overlay needs to be prefixed by a non-conflicting path with the
+	// local filesystem, otherwise Cue will merge the Overlay with whatever Cue
+	// files it finds locally.
+	const overlayPrefix = "/config"
+
+	buildConfig := &cueload.Config{
+		Dir:     overlayPrefix,
+		Overlay: map[string]cueload.Source{},
+	}
+	buildArgs := args
+
+	// Inject cue files from llb state into overlay
+	ref, err := job.Solve(ctx, st)
+	if err != nil {
+		return nil, err
+	}
+	if err := loadFiles(ctx, ref, ".", overlayPrefix, buildConfig.Overlay); err != nil {
+		return nil, err
+	}
+
+	instances := cueload.Instances(buildArgs, buildConfig)
+	if len(instances) != 1 {
+		return nil, errors.New("only one package is supported at a time")
+	}
+	inst, err := job.r.Build(instances[0])
+	if err != nil {
+		return nil, cueErr(err)
+	}
+	return inst, nil
+}
+
+func (job Job) Solve(ctx context.Context, st llb.State) (bkgw.Reference, error) {
+	// marshal llb
+	def, err := st.Marshal(ctx, llb.LinuxAmd64)
+	if err != nil {
+		return nil, err
+	}
+	// call solve
+	res, err := job.bk().Solve(ctx, bkgw.SolveRequest{Definition: def.ToPB()})
+	if err != nil {
+		return nil, err
+	}
+	// always use single reference (ignore multiple outputs & metadata)
+	return res.SingleRef()
+}

dagger/json.go

@@ -0,0 +1,138 @@
+package dagger
+
+import (
+	"fmt"
+
+	"cuelang.org/go/cue"
+	cuejson "cuelang.org/go/encoding/json"
+	"github.com/KromDaniel/jonson"
+	"github.com/pkg/errors"
+)
+
+type JSON []byte
+
+func (s JSON) Get(path ...string) ([]byte, error) {
+	if s == nil {
+		s = []byte("{}")
+	}
+	var (
+		root *jonson.JSON
+	)
+	root, err := jonson.Parse(s)
+	if err != nil {
+		return nil, errors.Wrap(err, "parse root json")
+	}
+	pointer := root
+	for _, key := range path {
+		// FIXME: we can traverse maps but not arrays (need to handle int keys)
+		pointer = pointer.At(key)
+	}
+	// FIXME: use indent function from stdlib
+	return pointer.ToJSON()
+}
+
+func (s JSON) Unset(path ...string) (JSON, error) {
+	if s == nil {
+		s = []byte("{}")
+	}
+	var (
+		root *jonson.JSON
+	)
+	root, err := jonson.Parse(s)
+	if err != nil {
+		return nil, errors.Wrap(err, "unset: parse root json")
+	}
+	var (
+		pointer = root
+		pathDir []string
+	)
+	if len(path) > 0 {
+		pathDir = path[:len(path)-1]
+	}
+	for _, key := range pathDir {
+		pointer = pointer.At(key)
+	}
+	if len(path) == 0 {
+		pointer.Set(nil)
+	} else {
+		key := path[len(path)-1]
+		pointer.DeleteMapKey(key)
+	}
+	return root.ToJSON()
+}
+
+func (s JSON) Set(valueJSON []byte, path ...string) (JSON, error) {
+	if s == nil {
+		s = []byte("{}")
+	}
+	var (
+		root  *jonson.JSON
+		value *jonson.JSON
+	)
+	root, err := jonson.Parse(s)
+	if err != nil {
+		return nil, errors.Wrap(err, "parse root json")
+	}
+	value, err = jonson.Parse(valueJSON)
+	if err != nil {
+		return nil, errors.Wrapf(err, "SetJSON: parse value json: |%s|", valueJSON)
+	}
+	var (
+		pointer = root
+		pathDir []string
+	)
+	if len(path) > 0 {
+		pathDir = path[:len(path)-1]
+	}
+	for _, key := range pathDir {
+		if !pointer.ObjectKeyExists(key) {
+			pointer.MapSet(key, jonson.NewEmptyJSONMap())
+		}
+		pointer = pointer.At(key)
+	}
+	if len(path) == 0 {
+		pointer.Set(value)
+	} else {
+		key := path[len(path)-1]
+		pointer.MapSet(key, value)
+	}
+	return root.ToJSON()
+}
+
+func (s JSON) Merge(layers ...JSON) (JSON, error) {
+	r := new(cue.Runtime)
+	var resultInst *cue.Instance
+	for i, l := range append([]JSON{s}, layers...) {
+		if l == nil {
+			continue
+		}
+		filename := fmt.Sprintf("%d", i)
+		inst, err := cuejson.Decode(r, filename, []byte(l))
+		if err != nil {
+			return nil, err
+		}
+		if resultInst == nil {
+			resultInst = inst
+		} else {
+			resultInst, err = resultInst.Fill(inst.Value())
+			if err != nil {
+				return nil, err
+			}
+			if resultInst.Err != nil {
+				return nil, resultInst.Err
+			}
+		}
+	}
+	b, err := resultInst.Value().MarshalJSON()
+	if err != nil {
+		return nil, err
+	}
+	return JSON(b), nil
+}
+
+func (s JSON) String() string {
+	if s == nil {
+		return "{}"
+	}
+	return string(s)
+}

dagger/runtime.go

@@ -0,0 +1,109 @@
+//go:generate sh gen.sh
+package dagger
+
+import (
+	"context"
+	"fmt"
+	"sync"
+
+	"cuelang.org/go/cue"
+	cueerrors "cuelang.org/go/cue/errors"
+	bkgw "github.com/moby/buildkit/frontend/gateway/client"
+	"github.com/pkg/errors"
+)
+
+type Runtime struct {
+	l sync.Mutex
+
+	cue.Runtime
+}
+
+func (r *Runtime) Cue() *cue.Runtime {
+	return &(r.Runtime)
+}
+
+func (r *Runtime) fill(inst *cue.Instance, v interface{}, target string) (*cue.Instance, error) {
+	targetPath := cue.ParsePath(target)
+	if err := targetPath.Err(); err != nil {
+		return nil, err
+	}
+	p := cuePathToStrings(targetPath)
+	if src, ok := v.(string); ok {
+		vinst, err := r.Compile(target, src)
+		if err != nil {
+			return nil, err
+		}
+		return inst.Fill(vinst.Value(), p...)
+	}
+	return inst.Fill(v, p...)
+}
+
+// func (r Runtime) Run(...)
+// Buildkit run entrypoint
+func (r *Runtime) BKFrontend(ctx context.Context, c bkgw.Client) (*bkgw.Result, error) {
+	return r.newJob(c).BKExecute(ctx)
+}
+
+func (r *Runtime) newJob(c bkgw.Client) Job {
+	return Job{
+		r: r,
+		c: c,
+	}
+}
+
+// Check whether a value is a valid component
+// FIXME: calling matchSpec("#Component") is not enough because
+//   it does not match embedded scalars.
+func (r *Runtime) isComponent(v cue.Value, fields ...string) (bool, error) {
+	cfg := v.LookupPath(cue.ParsePath("#dagger"))
+	if cfg.Err() != nil {
+		// No "#dagger" -> not a component
+		return false, nil
+	}
+	for _, field := range fields {
+		if cfg.Lookup(field).Err() != nil {
+			return false, nil
+		}
+	}
+	if err := r.validateSpec(cfg, "#ComponentConfig"); err != nil {
+		return true, errors.Wrap(err, "invalid #dagger")
+	}
+	return true, nil
+}
+
+// eg. validateSpec(op, "#Op")
+// eg. validateSpec(dag, "#DAG")
+func (r *Runtime) validateSpec(v cue.Value, defpath string) (err error) {
+	// Expand cue errors to get full details
+	// FIXME: there is probably a cleaner way to do this.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("%s", cueerrors.Details(err, nil))
+		}
+	}()
+	r.l.Lock()
+	defer r.l.Unlock()
+
+	// FIXME cache spec instance
+	spec, err := r.Compile("dagger.cue", DaggerSpec)
+	if err != nil {
+		panic("invalid spec")
+	}
+	def := spec.Value().LookupPath(cue.ParsePath(defpath))
+	if err := def.Err(); err != nil {
+		return err
+	}
+	v = v.Eval()
+	if err := v.Validate(); err != nil {
+		return err
+	}
+	res := def.Unify(v)
+	if err := res.Validate(cue.Final()); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (r *Runtime) matchSpec(v cue.Value, def string) bool {
+	return r.validateSpec(v, def) == nil
+}

dagger/script.go

@@ -0,0 +1,326 @@
+package dagger
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"cuelang.org/go/cue"
+	"github.com/moby/buildkit/client/llb"
+	"github.com/pkg/errors"
+)
+
+type Script struct {
+	v   cue.Value
+	job Job
+
+	// current state
+	state *State
+}
+
+func (job Job) newScript(v cue.Value) (*Script, error) {
+	s := &Script{
+		v:     v,
+		job:   job,
+		state: NewState(job),
+	}
+	if err := s.Validate(); err != nil {
+		return nil, s.err(err, "invalid script")
+	}
+	return s, nil
+}
+
+type Action func(context.Context, cue.Value, Fillable) error
+
+func (s *Script) Run(ctx context.Context, out Fillable) error {
+	op, err := s.Cue().List()
+	if err != nil {
+		return s.err(err, "run")
+	}
+	i := 0
+	for op.Next() {
+		// If op is not concrete, interrupt execution without error.
+		// This allows gradual resolution: compute what you can compute.. leave the rest incomplete.
+		if !cueIsConcrete(op.Value()) {
+			debugf("%s: non-concrete op. Leaving script unfinished", op.Value().Path().String())
+			return nil
+		}
+		if err := s.Do(ctx, op.Value(), out); err != nil {
+			return s.err(err, "run op %d", i+1)
+		}
+		i += 1
+	}
+	return nil
+}
+
+func (s *Script) Do(ctx context.Context, op cue.Value, out Fillable) error {
+	// Skip no-ops without error (allows more flexible use of if())
+	// FIXME: maybe not needed once a clear pattern is established for
+	// how to use if() in a script?
+	if cueIsEmptyStruct(op) {
+		return nil
+	}
+	actions := map[string]Action{
+		// "#Copy": s.copy,
+		"#Exec":           s.exec,
+		"#Export":         s.export,
+		"#FetchContainer": s.fetchContainer,
+		"#FetchGit":       s.fetchGit,
+		"#Load":           s.load,
+		"#Copy":           s.copy,
+	}
+	for def, action := range actions {
+		if s.matchSpec(op, def) {
+			debugf("OP MATCH: %s: %s: %v", def, op.Path().String(), op)
+			return action(ctx, op, out)
+		}
+	}
+	return fmt.Errorf("[%s] invalid operation: %s", s.v.Path().String(), cueToJSON(op))
+}
+
+func (s *Script) copy(ctx context.Context, v cue.Value, out Fillable) error {
+	// Decode copy options
+	var op struct {
+		Src  string
+		Dest string
+	}
+	if err := v.Decode(&op); err != nil {
+		return err
+	}
+	from := v.Lookup("from")
+	if isComponent, err := s.job.r.isComponent(from); err != nil {
+		return err
+	} else if isComponent {
+		return s.copyComponent(ctx, from, op.Src, op.Dest)
+	}
+	if s.matchSpec(from, "#Script") {
+		return s.copyScript(ctx, from, op.Src, op.Dest)
+	}
+	return fmt.Errorf("copy: invalid source")
+}
+
+func (s *Script) copyScript(ctx context.Context, from cue.Value, src, dest string) error {
+	// Load source script
+	fromScript, err := s.job.newScript(from)
+	if err != nil {
+		return err
+	}
+	// Execute source script
+	if err := fromScript.Run(ctx, Discard()); err != nil {
+		return err
+	}
+	return s.State().Change(ctx, func(st llb.State) llb.State {
+		return st.File(llb.Copy(
+			fromScript.State().LLB(),
+			src,
+			dest,
+			// FIXME: allow more configurable llb options
+			// For now we define the following convenience presets:
+			&llb.CopyInfo{
+				CopyDirContentsOnly: true,
+				CreateDestPath:      true,
+				AllowWildcard:       true,
+			},
+		))
+	})
+}
+
+func (s *Script) copyComponent(ctx context.Context, from cue.Value, src, dest string) error {
+	return s.copyScript(ctx, from.LookupPath(cue.ParsePath("#dagger.compute")), src, dest)
+}
+
+func (s *Script) load(ctx context.Context, op cue.Value, out Fillable) error {
+	from := op.Lookup("from")
+	isComponent, err := s.job.r.isComponent(from)
+	if err != nil {
+		return err
+	}
+	if isComponent {
+		debugf("LOAD: from is a component")
+		return s.loadScript(ctx, from.LookupPath(cue.ParsePath("#dagger.compute")))
+	}
+	if s.matchSpec(from, "#Script") {
+		return s.loadScript(ctx, from)
+	}
+	return fmt.Errorf("load: invalid source")
+}
+
+func (s *Script) loadScript(ctx context.Context, v cue.Value) error {
+	from, err := s.job.newScript(v)
+	if err != nil {
+		return errors.Wrap(err, "load")
+	}
+	// NOTE we discard cue outputs from running the loaded script.
+	// This means we load the LLB state but NOT the cue exports.
+	// In other words: cue exports are always private to their original location.
+	if err := from.Run(ctx, Discard()); err != nil {
+		return errors.Wrap(err, "load/execute")
+	}
+	// overwrite buildkit state from loaded from
+	s.state = from.state
+	return nil
+}
+
+func (s *Script) exec(ctx context.Context, v cue.Value, out Fillable) error {
+	var opts []llb.RunOption
+	var cmd struct {
+		Args   []string
+		Env    map[string]string
+		Dir    string
+		Always bool
+	}
+	v.Decode(&cmd)
+	// marker for status events
+	opts = append(opts, llb.WithCustomName(v.Path().String()))
+	// args
+	opts = append(opts, llb.Args(cmd.Args))
+	// dir
+	dir := cmd.Dir
+	if dir == "" {
+		dir = "/"
+	}
+	// env
+	for k, v := range cmd.Env {
+		opts = append(opts, llb.AddEnv(k, v))
+	}
+	// always?
+	if cmd.Always {
+		cacheBuster, err := randomID(8)
+		if err != nil {
+			return err
+		}
+		opts = append(opts, llb.AddEnv("DAGGER_CACHEBUSTER", cacheBuster))
+	}
+	// mounts
+	mnt, _ := v.Lookup("mount").Fields()
+	for mnt.Next() {
+		opt, err := s.mount(ctx, mnt.Label(), mnt.Value())
+		if err != nil {
+			return err
+		}
+		opts = append(opts, opt)
+	}
+	// --> Execute
+	return s.State().Change(ctx, func(st llb.State) llb.State {
+		return st.Run(opts...).Root()
+	})
+}
+
+func (s *Script) mount(ctx context.Context, dest string, source cue.Value) (llb.RunOption, error) {
+	if s.matchSpec(source, "#MountTmp") {
+		return llb.AddMount(dest, llb.Scratch(), llb.Tmpfs()), nil
+	}
+	if s.matchSpec(source, "#MountCache") {
+		// FIXME: cache mount
+		return nil, fmt.Errorf("FIXME: cache mount not yet implemented")
+	}
+	if s.matchSpec(source, "#MountScript") {
+		return s.mountScript(ctx, dest, source)
+	}
+	if s.matchSpec(source, "#MountComponent") {
+		return s.mountComponent(ctx, dest, source)
+	}
+	return nil, fmt.Errorf("mount %s to %s: invalid source", source.Path().String(), dest)
+}
+
+// mount when the input is a script (see mountComponent, mountTmpfs, mountCache)
+func (s *Script) mountScript(ctx context.Context, dest string, source cue.Value) (llb.RunOption, error) {
+	script, err := s.job.newScript(source)
+	if err != nil {
+		return nil, err
+	}
+	// FIXME: this is where we re-run everything,
+	// and rely on solver cache / dedup
+	if err := script.Run(ctx, Discard()); err != nil {
+		return nil, err
+	}
+	return llb.AddMount(dest, script.State().LLB()), nil
+}
+
+func (s *Script) mountComponent(ctx context.Context, dest string, source cue.Value) (llb.RunOption, error) {
+	return s.mountScript(ctx, dest, source.LookupPath(cue.ParsePath("from.#dagger.compute")))
+}
+
+func (s *Script) fetchContainer(ctx context.Context, v cue.Value, out Fillable) error {
+	var op struct {
+		Ref string
+	}
+	if err := v.Decode(&op); err != nil {
+		return errors.Wrap(err, "decode fetch-container")
+	}
+	return s.State().Change(ctx, llb.Image(op.Ref))
+}
+
+func (s *Script) fetchGit(ctx context.Context, v cue.Value, out Fillable) error {
+	// See #FetchGit in spec.cue
+	var op struct {
+		Remote string
+		Ref    string
+	}
+	if err := v.Decode(&op); err != nil {
+		return errors.Wrap(err, "decode fetch-git")
+	}
+	return s.State().Change(ctx, llb.Git(op.Remote, op.Ref))
+}
+
+func (s *Script) export(ctx context.Context, v cue.Value, out Fillable) error {
+	// See #Export in spec.cue
+	var op struct {
+		Source string
+		// FIXME: target
+		// Target string
+		Format string
+	}
+	v.Decode(&op)
+	b, err := s.State().ReadFile(ctx, op.Source)
+	if err != nil {
+		return err
+	}
+	switch op.Format {
+	case "string":
+		return out.Fill(string(b))
+	case "json":
+		var o interface{}
+		if err := json.Unmarshal(b, &o); err != nil {
+			return err
+		}
+		return out.Fill(o)
+	default:
+		return fmt.Errorf("unsupported export format: %q", op.Format)
+	}
+}
+
+func (s *Script) Cue() cue.Value {
+	return s.v
+}
+
+func (s *Script) Location() string {
+	return s.Cue().Path().String()
+}
+
+func (s *Script) err(e error, msg string, args ...interface{}) error {
+	return errors.Wrapf(e, s.Location()+": "+msg, args...)
+}
+
+func (s *Script) Validate() error {
+	return s.job.r.validateSpec(s.Cue(), "#Script")
+}
+
+func (s *Script) State() *State {
+	return s.state
+}
+
+func (s *Script) matchSpec(v cue.Value, def string) bool {
+	// FIXME: we manually filter out empty structs to avoid false positives
+	// This is necessary because Runtime.ValidateSpec has a bug
+	// where an empty struct matches everything.
+	// see https://github.com/cuelang/cue/issues/566#issuecomment-749735878
+	// Once the bug is fixed, the manual check can be removed.
+	if st, err := v.Struct(); err == nil {
+		if st.Len() == 0 {
+			debugf("FIXME: manually filtering out empty struct from spec match")
+			return false
+		}
+	}
+	return s.job.r.matchSpec(v, def)
+}

dagger/spec.cue

@@ -0,0 +1,152 @@
+package dagger
+
+// A DAG is the basic unit of programming in dagger.
+// It is a special kind of program which runs as a pipeline of computing nodes running in parallel,
+// instead of a sequence of operations to be run by a single node.
+//
+// It is a powerful way to automate various parts of an application delivery workflow:
+// build, test, deploy, generate configuration, enforce policies, publish artifacts, etc.
+//
+// The DAG architecture has many benefits:
+//  - Because DAGs are made of nodes executing in parallel, they are easy to scale.
+//  - Because all inputs and outputs are snapshotted and content-addressed, DAGs
+//		can easily be made repeatable, can be cached aggressively, and can be replayed
+//		at will.
+//  - Because nodes are executed by the same container engine as docker-build, DAGs
+//		can be developed using any language or technology capable of running in a docker.
+//		Dockerfiles and docker images are natively supported for maximum compatibility.
+//
+//  - Because DAGs are programmed declaratively with a powerful configuration language,
+//		they are much easier to test, debug and refactor than traditional programming languages.
+//
+// To execute a DAG, the dagger runtime JIT-compiles it to a low-level format called
+// llb, and executes it with buildkit.
+// Think of buildkit as a specialized VM for running compute graphs; and dagger as
+// a complete programming environment for that VM.
+//
+// The tradeoff for all those wonderful features is that a DAG architecture cannot be used
+// for all software: only software than can be run as a pipeline.
+//
+
+// A dagger component is a configuration value augmented
+// by scripts defining how to compute it, present it to a user,
+// encrypt it, etc.
+
+// FIXME: #Component will not match embedded scalars.
+//   use Runtime.isComponent() for a reliable check
+#Component: {
+	#dagger: #ComponentConfig
+	...
+}
+
+// The contents of a #dagger annotation
+#ComponentConfig: {
+	input?: bool
+
+	// script to compute the value
+	compute?:  #Script
+
+	terminal?: {
+		// Display a message when opening a terminal session
+		greeting?: string
+		command: [string]: #Script
+	}
+	// Configure how the component is incorporated to user settings.
+	// Configure how the end-user can configure this component
+	settings?: {
+		// If not specified, scrape from comments
+		title?:       string
+		description?: string
+		// Disable user input, even if incomplete?
+		hidden: true | *false
+		ui:     _ // insert here something which can be compiled to react-jsonschema-form
+		// Show the cue default value to the user, as a default input value?
+		showDefault: true | *false
+
+		// Insert information needed by:
+		//   1) clients to encrypt
+		//  ie. web wizard, cli
+		//   2) middleware to implement deicphering in the cuellb pipeline
+		//  eg. integration with clcoud KMS, Vault...
+		//
+		//   3) connectors to make sure secrets are preserved 
+		encrypt?: {
+			pubkey: string
+			cipher: string
+		}
+	}
+}
+
+
+
+// Any component can be referenced as a directory, since
+// every dagger script outputs a filesystem state (aka a directory)
+#Dir: #Component
+
+#Script: [...#Op]
+
+// One operation in a script
+#Op: #FetchContainer | #FetchGit | #Export | #Exec | #Load | #Copy
+
+// Export a value from fs state to cue
+#Export: {
+	do: "export"
+	// Source path in the container
+	source: string
+	format: "json"|"yaml"|*"string"|"number"|"boolean"
+}
+
+#Load: #LoadComponent| #LoadScript
+#LoadComponent: {
+	do: "load"
+	from: #Component
+}
+#LoadScript: {
+	do: "load"
+	from: #Script
+}
+
+
+#Exec: {
+	do: "exec"
+	args: [...string]
+	env: [string]: string
+	always: true | *false
+	dir: string | *"/"
+	mount?: [string]: #MountTmp | #MountCache | #MountComponent | #MountScript
+}
+
+#MountTmp: "tmpfs"
+#MountCache: "cache"
+#MountComponent: {
+	input: #Component
+	path: string | *"/"
+}
+#MountScript: {
+	input: #Script
+	path: string | *"/"
+}
+
+#FetchContainer: {
+	do: "fetch-container"
+	ref: string
+}
+
+#FetchGit: {
+	do: "fetch-git"
+	remote: string
+	ref: string
+}
+
+#Copy: {
+	do: "copy"
+	from: #Script | #Component
+	src: string | *"/"
+	dest: string | *"/"
+}
+
+
+#TestScript: #Script & [
+	{ do: "fetch-container", ref: "alpine:latest" },
+	{ do: "exec", args: ["echo", "hello", "world" ] }
+]

dagger/spec_test.go

@@ -0,0 +1,94 @@
+package dagger
+
+import (
+	"testing"
+
+	"cuelang.org/go/cue"
+)
+
+func TestMatch(t *testing.T) {
+	var data = []struct {
+		Src string
+		Def string
+	}{
+		{
+			Src: `do: "exec", args: ["echo", "hello"]`,
+			Def: "#Exec",
+		},
+		{
+			Src: `do: "fetch-git", remote: "github.com/shykes/tests"`,
+			Def: "#FetchGit",
+		},
+		{
+			Src: `do: "load", from: [{do: "exec", args: ["echo", "hello"]}]`,
+			Def: "#Load",
+		},
+		{
+			Src: `do: "load", from: #dagger: compute: [{do: "exec", args: ["echo", "hello"]}]`,
+			Def: "#Load",
+		},
+		// Make sure an empty op does NOT match
+		{
+			Src: ``,
+			Def: "",
+		},
+		{
+			Src: `do: "load"
+let package={bash:">3.0"}
+from: foo
+let foo={#dagger: compute: [
+	{do: "fetch-container", ref: "alpine"},
+	for pkg, info in package {
+		if (info & true) != _|_ {
+			do: "exec"
+			args: ["echo", "hello", pkg]
+		}
+		if (info & string) != _|_ {
+			do: "exec"
+			args: ["echo", "hello", pkg, info]
+		}
+	}
+]}
+`,
+			Def: "#Load",
+		},
+	}
+	for _, d := range data {
+		testMatch(t, d.Src, d.Def)
+	}
+}
+
+// Test an example op for false positives and negatives
+func testMatch(t *testing.T, src interface{}, def string) {
+	r := &Runtime{}
+	op := compile(t, r, src)
+	if def != "" {
+		if !r.matchSpec(op, def) {
+			t.Errorf("false negative: %s: %q", def, src)
+		}
+	}
+	for _, cmpDef := range []string{
+		"#Exec",
+		"#FetchGit",
+		"#FetchContainer",
+		"#Export",
+		"#Load",
+		"#Copy",
+	} {
+		if cmpDef == def {
+			continue
+		}
+		if r.matchSpec(op, cmpDef) {
+			t.Errorf("false positive: %s: %q", cmpDef, src)
+		}
+	}
+	return
+}
+
+func compile(t *testing.T, r *Runtime, src interface{}) cue.Value {
+	inst, err := r.Compile("", src)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return inst.Value()
+}

dagger/state.go

@@ -0,0 +1,53 @@
+package dagger
+
+import (
+	"context"
+	"os"
+
+	"github.com/moby/buildkit/client/llb"
+	bkgw "github.com/moby/buildkit/frontend/gateway/client"
+)
+
+type State struct {
+	// Before last solve
+	input llb.State
+	// After last solve
+	output bkgw.Reference
+	// How to produce the output
+	s Solver
+}
+
+func NewState(s Solver) *State {
+	return &State{
+		input: llb.Scratch(),
+		s:     s,
+	}
+}
+
+func (s *State) ReadFile(ctx context.Context, filename string) ([]byte, error) {
+	if s.output == nil {
+		return nil, os.ErrNotExist
+	}
+	return s.output.ReadFile(ctx, bkgw.ReadRequest{Filename: filename})
+}
+
+func (s *State) Change(ctx context.Context, op interface{}) error {
+	input := s.input
+	switch OP := op.(type) {
+	case llb.State:
+		input = OP
+	case func(llb.State) llb.State:
+		input = OP(input)
+	}
+	output, err := s.s.Solve(ctx, input)
+	if err != nil {
+		return err
+	}
+	s.input = input
+	s.output = output
+	return nil
+}
+
+func (s *State) LLB() llb.State {
+	return s.input
+}

dagger/ui/ui.go

@@ -0,0 +1,26 @@
+package ui
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func Fatalf(msg string, args ...interface{}) {
+	if !strings.HasSuffix(msg, "\n") {
+		msg = msg + "\n"
+	}
+	fmt.Fprintf(os.Stderr, msg, args...)
+	os.Exit(1)
+}
+
+func Fatal(msg interface{}) {
+	Fatalf("%s\n", msg)
+}
+
+func Info(msg string, args ...interface{}) {
+	if !strings.HasSuffix(msg, "\n") {
+		msg = msg + "\n"
+	}
+	fmt.Fprintf(os.Stderr, "[info] "+msg, args...)
+}

dagger/utils.go

@@ -0,0 +1,288 @@
+package dagger
+
+import (
+	"crypto/rand"
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"cuelang.org/go/cue"
+	cueAst "cuelang.org/go/cue/ast"
+	cueerrors "cuelang.org/go/cue/errors"
+	cueformat "cuelang.org/go/cue/format"
+	cueload "cuelang.org/go/cue/load"
+	cueParser "cuelang.org/go/cue/parser"
+	"github.com/moby/buildkit/client/llb"
+	"github.com/moby/buildkit/client/llb/imagemetaresolver"
+	"github.com/pkg/errors"
+)
+
+// A nil equivalent for cue.Value (when returning errors)
+var qnil cue.Value
+
+type Fillable interface {
+	Fill(interface{}) error
+}
+
+func Discard() Fillable {
+	return discard{}
+}
+
+type discard struct{}
+
+func (d discard) Fill(x interface{}) error {
+	return nil
+}
+
+type fillableValue struct {
+	root cue.Value
+}
+
+func cuePrint(v cue.Value) (string, error) {
+	b, err := cueformat.Node(v.Syntax())
+	if err != nil {
+		return "", err
+	}
+	return string(b), nil
+}
+
+func (f *fillableValue) Fill(v interface{}) error {
+	root2 := f.root.Fill(v)
+	if err := root2.Err(); err != nil {
+		return err
+	}
+	f.root = root2
+	return nil
+}
+
+func cueScratch(r *cue.Runtime) Fillable {
+	f := &fillableValue{}
+	if inst, err := r.Compile("", ""); err == nil {
+		f.root = inst.Value()
+	}
+	return f
+}
+
+func cueErr(err error) error {
+	return fmt.Errorf("%s", cueerrors.Details(err, &cueerrors.Config{}))
+}
+
+func cueDecodeArray(a cue.Value, idx int, out interface{}) {
+	a.LookupPath(cue.MakePath(cue.Index(idx))).Decode(out)
+}
+
+func cueToJSON(v cue.Value) JSON {
+	var out JSON
+	v.Walk(
+		func(v cue.Value) bool {
+			b, err := v.MarshalJSON()
+			if err == nil {
+				newOut, err := out.Set(b, cuePathToStrings(v.Path())...)
+				if err == nil {
+					out = newOut
+				}
+				return false
+			}
+			return true
+		},
+		nil,
+	)
+	return out
+}
+
+// Build a cue instance from a directory and args
+func cueBuild(r *cue.Runtime, cueRoot string, buildArgs ...string) (*cue.Instance, error) {
+	var err error
+	cueRoot, err = filepath.Abs(cueRoot)
+	if err != nil {
+		return nil, err
+	}
+	buildConfig := &cueload.Config{
+		ModuleRoot: cueRoot,
+		Dir:        cueRoot,
+	}
+	instances := cueload.Instances(buildArgs, buildConfig)
+	if len(instances) != 1 {
+		return nil, errors.New("only one package is supported at a time")
+	}
+	return r.Build(instances[0])
+}
+
+func debugJSON(v interface{}) {
+	if os.Getenv("DEBUG") != "" {
+		e := json.NewEncoder(os.Stderr)
+		e.SetIndent("", "  ")
+		e.Encode(v)
+	}
+}
+
+func debugf(msg string, args ...interface{}) {
+	if !strings.HasSuffix(msg, "\n") {
+		msg = msg + "\n"
+	}
+	if os.Getenv("DEBUG") != "" {
+		fmt.Fprintf(os.Stderr, msg, args...)
+	}
+}
+
+func debug(msg string) {
+	if os.Getenv("DEBUG") != "" {
+		fmt.Fprintln(os.Stderr, msg)
+	}
+}
+
+func randomID(size int) (string, error) {
+	b := make([]byte, size)
+	_, err := rand.Read(b)
+	if err != nil {
+		return "", err
+	}
+	return fmt.Sprintf("%x", b), nil
+}
+
+func cueWrapExpr(p string, v cueAst.Expr) (cueAst.Expr, error) {
+	pExpr, err := cueParser.ParseExpr("path", p)
+	if err != nil {
+		return v, err
+	}
+	out := v
+	cursor := pExpr
+walk:
+	for {
+		switch c := cursor.(type) {
+		case *cueAst.SelectorExpr:
+			out = cueAst.NewStruct(
+				&cueAst.Field{
+					Value: out,
+					Label: c.Sel,
+				},
+			)
+			cursor = c.X
+		case *cueAst.Ident:
+			out = cueAst.NewStruct(
+				&cueAst.Field{
+					Value: out,
+					Label: c,
+				},
+			)
+			break walk
+		default:
+			return out, fmt.Errorf("invalid path expression: %q", p)
+		}
+	}
+	return out, nil
+}
+
+func cueWrapFile(p string, v interface{}) (*cueAst.File, error) {
+	f, err := cueParser.ParseFile("value", v)
+	if err != nil {
+		return f, err
+	}
+	decls := make([]cueAst.Decl, 0, len(f.Decls))
+	for _, decl := range f.Decls {
+		switch d := decl.(type) {
+		case *cueAst.Field:
+			wrappedExpr, err := cueWrapExpr(p, cueAst.NewStruct(d))
+			if err != nil {
+				return f, err
+			}
+			decls = append(decls, &cueAst.EmbedDecl{Expr: wrappedExpr})
+		case *cueAst.EmbedDecl:
+			wrappedExpr, err := cueWrapExpr(p, d.Expr)
+			if err != nil {
+				return f, err
+			}
+			d.Expr = wrappedExpr
+			decls = append(decls, d)
+		case *cueAst.ImportDecl:
+			decls = append(decls, decl)
+		default:
+			fmt.Printf("skipping unsupported decl type %#v\n\n", decl)
+			continue
+		}
+	}
+	f.Decls = decls
+	return f, nil
+}
+
+func cueIsEmptyStruct(v cue.Value) bool {
+	if st, err := v.Struct(); err == nil {
+		if st.Len() == 0 {
+			return true
+		}
+	}
+	return false
+}
+
+// Return false if v is not concrete, or contains any
+// non-concrete fields or items.
+func cueIsConcrete(v cue.Value) bool {
+	// FIXME: use Value.Walk?
+	if it, err := v.Fields(); err == nil {
+		for it.Next() {
+			if !cueIsConcrete(it.Value()) {
+				return false
+			}
+		}
+		return true
+	}
+	if it, err := v.List(); err == nil {
+		for it.Next() {
+			if !cueIsConcrete(it.Value()) {
+				return false
+			}
+		}
+		return true
+	}
+	dv, _ := v.Default()
+	return v.IsConcrete() || dv.IsConcrete()
+}
+
+// LLB Helper to pull a Docker image + all its metadata
+func llbDockerImage(ref string) llb.State {
+	return llb.Image(
+		ref,
+		llb.WithMetaResolver(imagemetaresolver.Default()),
+	)
+}
+
+func cueStringsToCuePath(parts ...string) cue.Path {
+	selectors := make([]cue.Selector, 0, len(parts))
+	for _, part := range parts {
+		selectors = append(selectors, cue.Str(part))
+	}
+	return cue.MakePath(selectors...)
+}
+
+func cuePathToStrings(p cue.Path) []string {
+	selectors := p.Selectors()
+	out := make([]string, len(selectors))
+	for i, sel := range selectors {
+		out[i] = sel.String()
+	}
+	return out
+}
+
+// Validate a cue path, and return a canonical version
+func cueCleanPath(p string) (string, error) {
+	cp := cue.ParsePath(p)
+	return cp.String(), cp.Err()
+}
+
+func autoMarshal(value interface{}) ([]byte, error) {
+	switch v := value.(type) {
+	case []byte:
+		return v, nil
+	case string:
+		return []byte(v), nil
+	case io.Reader:
+		return ioutil.ReadAll(v)
+	default:
+		return nil, fmt.Errorf("unsupported marshal inoput type")
+	}
+	return []byte(fmt.Sprintf("%v", value)), nil
+}

examples/acme-platform/README.md

@@ -0,0 +1,23 @@
+# ACME platform
+
+Welcome to the acme-platform repository. It contains everything you need to start developing and shipping improvements
+to the ACME Clothing Store.
+
+For information or support, contact the ACME Platform team: platform@acme.infralabs.io
+
+# Things you can do with ACME platform
+
+
+## Pre-merge or post-merge QA
+
+## Create a personal dev environment
+
+## Cross-team integration testing
+
+## Sales demos
+
+## End-to-end product reviews
+
+## Testing infrastructure changes
+
+## Deploying to production (REQUIRES SPECIAL PRIVILEGES, talk to your SRE)

examples/acme-platform/acme.cue

@@ -0,0 +1,38 @@
+// ACME platform: everything you need to develop and ship improvements to
+// the ACME clothing store.
+package acme
+
+import (
+	"dagger.cloud/dagger"
+	"dagger.cloud/netlify"
+	"dagger.cloud/aws/ecs"
+	"dagger.cloud/microstaging"
+)
+
+// Website on netlify
+www: netlify & {
+	domain: string | *defaultDomain
+
+	// By default, use a generated microstaging.io domain
+	// for easy environments on demand.
+	let defaultDomain=microstaging.#Domain & {
+		token: _
+		prefix: "www.acme"
+	}
+}
+
+// API deployed on ECS
+api: ecs & {
+	domain: _ | *defaultDomain
+
+	let defaultDomain = microstaging.#Domain & {
+		token: _
+		prefix: "api.acme"
+	}
+}
+
+// Database on RDS
+db: rds & {
+	engine: "postgresql"
+
+}

examples/acme-platform/alpine.cue

@@ -0,0 +1,24 @@
+package alpine
+
+
+#Image: {
+
+	version: string | *"latest"
+	packages: [...string]
+	
+	#dag: {
+		do: [
+				{
+					//
+					//
+					// fetch alpine
+				},
+				{
+					for _, pkg in packages {
+	
+					}
+				}
+	
+		]
+	}
+}

examples/acme-platform/cue.mod/module.cue

@@ -0,0 +1 @@
+module: "acme.infralabs.io/acme"

examples/acme-platform/cue.mod/pkg/dagger.cloud/dagger/dagger.cue

@@ -0,0 +1,104 @@
+package dagger
+
+// A DAG is the basic unit of programming in dagger.
+// It is a special kind of program which runs as a pipeline of computing nodes running in parallel,
+// instead of a sequence of operations to be run by a single node.
+//
+// It is a powerful way to automate various parts of an application delivery workflow:
+// build, test, deploy, generate configuration, enforce policies, publish artifacts, etc.
+//
+// The DAG architecture has many benefits:
+//  - Because DAGs are made of nodes executing in parallel, they are easy to scale.
+//  - Because all inputs and outputs are snapshotted and content-addressed, DAGs
+//		can easily be made repeatable, can be cached aggressively, and can be replayed
+//		at will.
+//  - Because nodes are executed by the same container engine as docker-build, DAGs
+//		can be developed using any language or technology capable of running in a docker.
+//		Dockerfiles and docker images are natively supported for maximum compatibility.
+//
+//  - Because DAGs are programmed declaratively with a powerful configuration language,
+//		they are much easier to test, debug and refactor than traditional programming languages.
+//
+// To execute a DAG, the dagger runtime JIT-compiles it to a low-level format called
+// llb, and executes it with buildkit.
+// Think of buildkit as a specialized VM for running compute graphs; and dagger as
+// a complete programming environment for that VM.
+//
+// The tradeoff for all those wonderful features is that a DAG architecture cannot be used
+// for all software: only software than can be run as a pipeline.
+//
+
+// A dagger component is a configuration value augmented
+// by scripts defining how to compute it, present it to a user,
+// encrypt it, etc.
+#Component: #dagger: {
+	// script to compute the value
+	compute?:  #Script
+
+	terminal?: {
+		// Display a message when opening a terminal session
+		greeting?: string
+		command: [string]: #Script
+	}
+	// Configure how the component is incorporated to user settings.
+	// Configure how the end-user can configure this component
+	settings?: {
+		// If not specified, scrape from comments
+		title?:       string
+		description?: string
+		// Disable user input, even if incomplete?
+		hidden: true | *false
+		ui:     _ // insert here something which can be compiled to react-jsonschema-form
+		// Show the cue default value to the user, as a default input value?
+		showDefault: true | *false
+
+		// Insert information needed by:
+		//   1) clients to encrypt
+		//  ie. web wizard, cli
+		//   2) middleware to implement deicphering in the cuellb pipeline
+		//  eg. integration with clcoud KMS, Vault...
+		//
+		//   3) connectors to make sure secrets are preserved 
+		encrypt?: {
+			pubkey: string
+			cipher: string
+		}
+	}
+}
+
+
+
+// Any component can be referenced as a directory, since
+// every dagger script outputs a filesystem state (aka a directory)
+#Dir: #Component
+
+#Script: [...#Op]
+
+// One operation in a script
+#Op: #Fetch | #Export | #Run | #Local
+
+// Export a value from fs state to cue
+#Export: ["export", string, "json"|"yaml"|"string"|"number"|"boolean"]
+
+#Run: #runNoOpts | #runWithOpts
+#runNoOpts: ["run", ...string]
+#runWithOpts: ["run", #RunOpts, ...string]
+
+#RunOpts: {
+	mount?: string: "tmpfs" | "cache" | { from: #Component|#Script }
+	env: [string]: string
+	dir: string | *"/"
+	always: true | *false
+}
+
+#Local: ["local", string]
+
+#Fetch: #FetchGit | #FetchContainer
+#FetchContainer: ["fetch", "container", string]
+#FetchGit: ["fetch", "git", string, string]
+
+
+#TestScript: #Script & [
+	["fetch", "container", "alpine:latest"],
+	["run", "echo", "hello", "world"]
+]

examples/acme-platform/mynetlify.cue

@@ -0,0 +1,63 @@
+package netlify
+
+import (
+	".../alpine"
+)
+
+
+
+
+
+auth: {
+	#dag: {
+		encrypted: true
+		do: [
+			{
+				action: "fetch"
+				type: "docker"
+				source: "alpine"
+			},
+			{
+				action: "push"
+			}
+		]
+	}
+
+	{
+		username: string
+		password: string
+	} | {
+		// FIXME: enrypted!
+		token: string
+	}
+}
+
+name: string
+domain?: string
+// FIXME: directory!
+source: bl.#Dir
+
+let base = alpine.#Image & {
+	version: "foo"
+	packages: ["rsync", "npm", "openssh"]
+}
+
+// Netlify site ID
+id: {
+	info1: string
+	info2: string
+
+	#dag: {
+		// run code to fetch id from netlify API
+		from: base
+		do: [
+			{
+				action: "run"
+				command: ["netlify-get-id", name, "-o", "/netlify-id.json"]
+			}
+		]
+		export: json: "/netlify-id.json"
+	}
+}
+
+url: string

examples/acme-platform/netlify/netlify.cue

@@ -0,0 +1,216 @@
+// Custom netlify package
+// ACME platform team <platform@acme.infralabs.io>
+//
+// TODO: upstream to dagger standard library.
+package netlify
+
+import (
+	"dagger.cloud/dagger"
+)
+
+// Netlify API token
+token: {
+	#dag: {
+		encrypt: cipher: "..."
+	}
+
+	string
+}
+
+
+// Netlify site name
+name?: string
+
+// Source directory to deploy
+source: dagger.#Dir
+
+
+let apply={
+	#dag: {
+		from: alpine.#Base
+		do: [
+			["run", "npm", "install", "netlify-cli", "-g"],
+			[
+				"copy",
+				[
+					"fetch", "git", "https://github.com/shykes/tests", "netlify-scripts",
+				], "/", "/src",
+			]
+			// 2. fetch custom netlify scripts & iunstall
+			// 3. get ID from name; create if doesn't exist
+			// 4. deploy (via builder)
+		]
+		command: {
+			debug: {
+				from: base
+				do: ["run", "sh", "-c", """
+					env && find /netlify
+					"""]
+			}
+		}
+	}
+}
+apply
+
+deployedDir: {
+	#dag: {
+		from: apply
+		export: dir: "/netlify/content"
+	}
+}
+
+// Netlify site ID
+ID: {
+	string
+
+	#dag: {
+		from: apply
+		export: string: "/netlify/site-id"
+	}
+}
+
+url: {
+	string
+
+	#dag: {
+		from: apply
+		export: string: "/netlify/url"
+	}
+}
+
+
+		// Example of short-form cuellb pipeline
+		//   1. single-op pipeline can omit the array
+		//   2. action encoded in first key, instead of `action: ` field
+		//   3. op may implement short-form,
+		//			in this case: `run: [...string]` instead of `run: { command: [...string] }`
+		do: run: ["ntlfy-get-site-id", name, "-o", "/netlify/site-id"]
+		// Declarative export from container, instead of awkward `readFile` pseudo-op
+		export: string: "/netlify/site-id"
+	}
+}
+
+
+// Configuration presets
+preset: {
+	*"html" | "react" | "custom"
+
+	#dag: {
+		settings: {
+			markup: select: {
+				"Static HTML site (no build)": "html"
+				"ReactJS app built with npm": "react"
+				"Custom builder": "custom"
+			}
+		}
+	}
+}
+
+// Custom builder
+// Default: no build, deploy as-is.
+builder: {
+	in: dagger.#Dir & source
+	out: dagger.#Dir
+
+	if preset == "html" {
+		// Pass-through builder that does nothing
+		out: in
+	}
+	if preset == "react" {
+		let app = reactjs.#App & {
+			source: in
+		}
+		out: app.build
+	}
+
+	...
+}
+
+
+scripts: {
+	dagger.#Directory | *latestScripts
+
+	let latestScripts = {
+		#dag: {
+				do: {
+					action: "fetch"
+					type: "git"
+					source: "https://github.com/shykes/tests"
+					ref: "netlify-scripts"
+				}
+			}
+			export: dir: "/"
+		}
+	}
+
+	// This is configurable for dev mode, but hide it from end users.
+	#dag: settings: hidden: true
+}
+
+// Version of the netlify CLI to use
+cliVersion: string | *latestCLIVersion
+
+let latestCLIVersion = {
+	string
+
+	#dag: {
+		from: base 
+		do: run: ["sh", "-c", "npm show netlify-cli dist-tags.latest > /latest-cli-version"]
+		export: string: "/latest-cli-version"
+	}
+}
+
+// Custom container to run netlify commands + wrappers
+let base=alpine.#Base & {
+	package: {
+		npm: true
+		curl: true
+	}
+}
+
+let runner = {
+	#dag: {
+		from: base
+		do: [
+			{
+				run: "npm", "install
+				action: "run"
+				command: ["npm", "install", "-g", "netlify-cli@" + cliVersion]
+			},
+			{
+			// YOU ARE HERE
+			// incorporate "netify scripts from personal github" pattern from other POC	
+			}
+	}
+}
+
+url: {
+	string
+
+	#dag: {
+		from: runner
+		do: run: {
+			command: #"""
+				netlify deploy
+			   	 --dir="$(pwd)" \
+			   	 --auth="$(cat /netlify/token)" \
+			   	 --site="${NETLIFY_SITE_ID}" \
+			   	 --message="Blocklayer 'netlify deploy'" \
+			   	 --prod \
+				| tee /tmp/stdout
+				curl \
+					-i -X POST \
+					-H "Authorization: Bearer $(cat /netlify/token)" \
+					"https://api.netlify.com/api/v1/sites/${NETLIFY_SITE_ID}/ssl"
+				"""#
+			mount: {
+				"/netlify/token": token
+				"/netlify/source": builder.out
+			}
+			dir: "/netlify/source"
+			env: {
+				NETLIFY_SITE_ID: ID
+			}
+		}
+	}
+}

examples/acme-platform/scratch.cue

@@ -0,0 +1,89 @@
+package netlify
+
+
+#dag: {
+	do: [
+		{
+			action: "fetch"
+			type: "container"
+			repository: "alpine"
+			tag: "latest"
+		},
+		{
+			action: "run"
+			command: "apk add ..."
+		},
+		{
+			action: "copy"
+			from: [
+				{
+					action: "fetch"
+					type: "git"
+					repo: "https://github.com/shykes/stuff"
+				}
+			]
+			source: "/"
+			dest: "/src"
+		},
+		
+	]
+}
+
+// Name of the netlify site
+name: {
+	string
+
+	#dag: {
+
+	}
+}
+
+// ID of the netlify site
+// FIXME: compute
+id: {
+	string
+
+	#dag: {
+		from: ...
+		do: [
+			action: "run"
+			command: ["netlify-get-id", name, "-o", "/netlify-id.txt"]
+		]
+		export: string: "/netlify-id.txt"
+	}
+}
+
+// API token
+// FIXME: encrypt secret!
+token: {
+	#encrypt: {
+		pubkey: _
+		cipher: _
+	}
+	string
+}
+
+// FIXME: how to receive a directory?
+source: bl.#Dir
+
+
+// Domain of the Netlify site
+domain?: string
+
+// FIXME: compute
+url: {
+
+	#dag: {
+		do: [
+			// ...
+			{
+				action: "run"
+				command: "netlify deploy"
+				dir: "/src"
+				mount: "/src": source
+			}
+		]
+	}
+
+	string
+}

examples/acme-platform/throaway

@@ -0,0 +1,3 @@
+
+
+

examples/olivier/cue.mod/pkg/dagger.cloud/alpine/alpine.cue

@@ -0,0 +1,46 @@
+package alpine
+
+// Default version pinned to digest. Manually updated.
+let defaultDigest="sha256:3c7497bf0c7af93428242d6176e8f7905f2201d8fc5861f45be7a346b5f23436"
+
+ref: string 
+
+// Match a combination of inputs 'version' and 'digest':
+*{
+	// no version, no digest:
+	ref: "index.docker.io/alpine@\(defaultDigest)"
+} | {
+	// version, no digest
+	version: string
+	ref: "alpine:\(version)"
+} | {
+	// digest, no version
+	digest: string
+	ref: "alpine@\(digest)"
+} | {
+	// version and digest
+	version: string
+	digest: string
+	ref: "alpine:\(version)@\(digest)"
+}
+
+// Packages to install
+package: [string]: true | false | string
+
+#dagger: compute: [
+	{
+		do: "fetch-container"
+		"ref": ref
+	},
+	for pkg, info in package {
+		if (info & true) != _|_ {
+			do: "exec"
+			args: ["apk", "add", "-U", "--no-cache", pkg]
+		}
+		if (info & string) != _|_  {
+			do: "exec"
+			args: ["apk", "add", "-U", "--no-cache", "\(pkg)\(info)"]
+		}
+	},
+]
+

examples/olivier/cue.mod/pkg/dagger.cloud/dagger/dagger.cue

@@ -0,0 +1,145 @@
+package dagger
+
+// A DAG is the basic unit of programming in dagger.
+// It is a special kind of program which runs as a pipeline of computing nodes running in parallel,
+// instead of a sequence of operations to be run by a single node.
+//
+// It is a powerful way to automate various parts of an application delivery workflow:
+// build, test, deploy, generate configuration, enforce policies, publish artifacts, etc.
+//
+// The DAG architecture has many benefits:
+//  - Because DAGs are made of nodes executing in parallel, they are easy to scale.
+//  - Because all inputs and outputs are snapshotted and content-addressed, DAGs
+//		can easily be made repeatable, can be cached aggressively, and can be replayed
+//		at will.
+//  - Because nodes are executed by the same container engine as docker-build, DAGs
+//		can be developed using any language or technology capable of running in a docker.
+//		Dockerfiles and docker images are natively supported for maximum compatibility.
+//
+//  - Because DAGs are programmed declaratively with a powerful configuration language,
+//		they are much easier to test, debug and refactor than traditional programming languages.
+//
+// To execute a DAG, the dagger runtime JIT-compiles it to a low-level format called
+// llb, and executes it with buildkit.
+// Think of buildkit as a specialized VM for running compute graphs; and dagger as
+// a complete programming environment for that VM.
+//
+// The tradeoff for all those wonderful features is that a DAG architecture cannot be used
+// for all software: only software than can be run as a pipeline.
+//
+
+// A dagger component is a configuration value augmented
+// by scripts defining how to compute it, present it to a user,
+// encrypt it, etc.
+#Component: {
+	#dagger: {
+		// script to compute the value
+		compute?:  #Script
+	
+		terminal?: {
+			// Display a message when opening a terminal session
+			greeting?: string
+			command: [string]: #Script
+		}
+		// Configure how the component is incorporated to user settings.
+		// Configure how the end-user can configure this component
+		settings?: {
+			// If not specified, scrape from comments
+			title?:       string
+			description?: string
+			// Disable user input, even if incomplete?
+			hidden: true | *false
+			ui:     _ // insert here something which can be compiled to react-jsonschema-form
+			// Show the cue default value to the user, as a default input value?
+			showDefault: true | *false
+
+			// Insert information needed by:
+			//   1) clients to encrypt
+			//  ie. web wizard, cli
+			//   2) middleware to implement deicphering in the cuellb pipeline
+			//  eg. integration with clcoud KMS, Vault...
+			//
+			//   3) connectors to make sure secrets are preserved 
+			encrypt?: {
+				pubkey: string
+				cipher: string
+			}
+		}
+	}
+	...
+}
+
+
+
+// Any component can be referenced as a directory, since
+// every dagger script outputs a filesystem state (aka a directory)
+#Dir: #Component
+
+#Script: [...#Op]
+
+// One operation in a script
+// #Op: #FetchContainer | #FetchGit | #Export | #Exec | #Copy | #Load
+#Op: #FetchContainer | #Export | #Exec
+
+// Export a value from fs state to cue
+#Export: {
+	do: "export"
+	// Source path in the container
+	source: string
+	format: "json"|"yaml"|*"string"|"number"|"boolean"
+}
+
+#Load: #LoadComponent| #LoadScript
+#LoadComponent: {
+	do: "load"
+	from: #Component
+}
+#LoadScript: {
+	do: "load"
+	from: #Script
+}
+
+
+#Exec: {
+	do: "exec"
+	args: [...string]
+	mount?: [string]: #MountTmp | #MountCache | #MountComponent | #MountScript
+	env: [string]: string
+	dir: string | *"/"
+	always: true | *false
+}
+
+#MountTmp: "tmpfs"
+#MountCache: "cache"
+#MountComponent: {
+	input: #Component
+	path: string | *"/"
+}
+#MountScript: {
+	input: #Script
+	path: string | *"/"
+}
+
+#FetchContainer: {
+	do: "fetch-container"
+	ref: string
+}
+
+#FetchGit: {
+	do: "fetch-git"
+	remote: string
+	ref: string
+}
+
+#Copy: {
+	do: "copy"
+	input: #Script | #Component
+	src: string | *"/"
+	dest: string | *"/"
+}
+
+
+#TestScript: #Script & [
+	{ do: "fetch-container", ref: "alpine:latest" },
+	{ do: "exec", args: ["echo", "hello", "world" ], env: DEBUG: "1" }
+]

examples/olivier/example.cue

@@ -0,0 +1,63 @@
+package example
+
+import (
+	"dagger.cloud/alpine"
+)
+
+test: {
+	string
+	#dagger: compute: [
+		{ do: "load", from: alpine },
+		{
+			do: "copy"
+			from: [
+				{ do: "fetch-container", ref: alpine.ref },
+			]
+			dest: "/src"
+		},
+		{
+			do: "exec"
+			dir: "/src"
+			args: ["sh", "-c", """
+				ls -l > /tmp/out
+				"""
+			]
+		},
+		{
+			do: "export"
+			source: "/tmp/out"
+			format: "string"
+		}
+	]
+}
+
+www: {
+
+	// Domain where the site will be deployed (user input)
+	domain: string
+
+	// URL after deployment (computed)
+	url: {
+		string & =~ "https://.*"
+
+		#dagger: {
+			compute: [
+				{ do: "load", from: alpine },
+				{
+					do: "exec"
+					args: ["sh", "-c",
+						"""
+						echo 'deploying to netlify (not really)'
+						echo 'https://\(domain)/foo' > /tmp/out
+						"""
+					]
+				},
+				{
+					do: "export"
+					source: "/tmp/out"
+					format: "string"
+				}
+			]
+		}
+	}
+}

examples/olivier/values.cue

@@ -0,0 +1,3 @@
+package example
+
+www: domain: "www.foobar.com"

examples/simple/cue.mod/module.cue

@@ -0,0 +1 @@
+module: "acme.infralabs.io/acme"

examples/simple/cue.mod/pkg/dagger.cloud/alpine/alpine.cue

@@ -0,0 +1,46 @@
+package alpine
+
+// Default version pinned to digest. Manually updated.
+let defaultDigest="sha256:3c7497bf0c7af93428242d6176e8f7905f2201d8fc5861f45be7a346b5f23436"
+
+ref: string 
+
+// Match a combination of inputs 'version' and 'digest':
+*{
+	// no version, no digest:
+	ref: "index.docker.io/alpine@\(defaultDigest)"
+} | {
+	// version, no digest
+	version: string
+	ref: "alpine:\(version)"
+} | {
+	// digest, no version
+	digest: string
+	ref: "alpine@\(digest)"
+} | {
+	// version and digest
+	version: string
+	digest: string
+	ref: "alpine:\(version)@\(digest)"
+}
+
+// Packages to install
+package: [string]: true | false | string
+
+#dagger: compute: [
+	{
+		do: "fetch-container"
+		"ref": ref
+	},
+	for pkg, info in package {
+		if (info & true) != _|_ {
+			do: "exec"
+			args: ["apk", "add", "-U", "--no-cache", pkg]
+		}
+		if (info & string) != _|_  {
+			do: "exec"
+			args: ["apk", "add", "-U", "--no-cache", "\(pkg)\(info)"]
+		}
+	},
+]
+

examples/simple/cue.mod/pkg/dagger.cloud/dagger/dagger.cue

@@ -0,0 +1,145 @@
+package dagger
+
+// A DAG is the basic unit of programming in dagger.
+// It is a special kind of program which runs as a pipeline of computing nodes running in parallel,
+// instead of a sequence of operations to be run by a single node.
+//
+// It is a powerful way to automate various parts of an application delivery workflow:
+// build, test, deploy, generate configuration, enforce policies, publish artifacts, etc.
+//
+// The DAG architecture has many benefits:
+//  - Because DAGs are made of nodes executing in parallel, they are easy to scale.
+//  - Because all inputs and outputs are snapshotted and content-addressed, DAGs
+//		can easily be made repeatable, can be cached aggressively, and can be replayed
+//		at will.
+//  - Because nodes are executed by the same container engine as docker-build, DAGs
+//		can be developed using any language or technology capable of running in a docker.
+//		Dockerfiles and docker images are natively supported for maximum compatibility.
+//
+//  - Because DAGs are programmed declaratively with a powerful configuration language,
+//		they are much easier to test, debug and refactor than traditional programming languages.
+//
+// To execute a DAG, the dagger runtime JIT-compiles it to a low-level format called
+// llb, and executes it with buildkit.
+// Think of buildkit as a specialized VM for running compute graphs; and dagger as
+// a complete programming environment for that VM.
+//
+// The tradeoff for all those wonderful features is that a DAG architecture cannot be used
+// for all software: only software than can be run as a pipeline.
+//
+
+// A dagger component is a configuration value augmented
+// by scripts defining how to compute it, present it to a user,
+// encrypt it, etc.
+#Component: {
+	#dagger: {
+		// script to compute the value
+		compute?:  #Script
+	
+		terminal?: {
+			// Display a message when opening a terminal session
+			greeting?: string
+			command: [string]: #Script
+		}
+		// Configure how the component is incorporated to user settings.
+		// Configure how the end-user can configure this component
+		settings?: {
+			// If not specified, scrape from comments
+			title?:       string
+			description?: string
+			// Disable user input, even if incomplete?
+			hidden: true | *false
+			ui:     _ // insert here something which can be compiled to react-jsonschema-form
+			// Show the cue default value to the user, as a default input value?
+			showDefault: true | *false
+
+			// Insert information needed by:
+			//   1) clients to encrypt
+			//  ie. web wizard, cli
+			//   2) middleware to implement deicphering in the cuellb pipeline
+			//  eg. integration with clcoud KMS, Vault...
+			//
+			//   3) connectors to make sure secrets are preserved 
+			encrypt?: {
+				pubkey: string
+				cipher: string
+			}
+		}
+	}
+	...
+}
+
+
+
+// Any component can be referenced as a directory, since
+// every dagger script outputs a filesystem state (aka a directory)
+#Dir: #Component
+
+#Script: [...#Op]
+
+// One operation in a script
+// #Op: #FetchContainer | #FetchGit | #Export | #Exec | #Copy | #Load
+#Op: #FetchContainer | #Export | #Exec
+
+// Export a value from fs state to cue
+#Export: {
+	do: "export"
+	// Source path in the container
+	source: string
+	format: "json"|"yaml"|*"string"|"number"|"boolean"
+}
+
+#Load: #LoadComponent| #LoadScript
+#LoadComponent: {
+	do: "load"
+	from: #Component
+}
+#LoadScript: {
+	do: "load"
+	from: #Script
+}
+
+
+#Exec: {
+	do: "exec"
+	args: [...string]
+	mount?: [string]: #MountTmp | #MountCache | #MountComponent | #MountScript
+	env: [string]: string
+	dir: string | *"/"
+	always: true | *false
+}
+
+#MountTmp: "tmpfs"
+#MountCache: "cache"
+#MountComponent: {
+	input: #Component
+	path: string | *"/"
+}
+#MountScript: {
+	input: #Script
+	path: string | *"/"
+}
+
+#FetchContainer: {
+	do: "fetch-container"
+	ref: string
+}
+
+#FetchGit: {
+	do: "fetch-git"
+	remote: string
+	ref: string
+}
+
+#Copy: {
+	do: "copy"
+	input: #Script | #Component
+	src: string | *"/"
+	dest: string | *"/"
+}
+
+
+#TestScript: #Script & [
+	{ do: "fetch-container", ref: "alpine:latest" },
+	{ do: "exec", args: ["echo", "hello", "world" ], env: DEBUG: "1" }
+]

examples/simple/simple.cue

@@ -0,0 +1,33 @@
+// ACME platform: everything you need to develop and ship improvements to
+// the ACME clothing store.
+package acme
+
+import (
+	"dagger.cloud/alpine"
+)
+
+let base=alpine & {
+	package: {
+		bash: ">3.0"
+		rsync: true
+	}
+}
+
+www: {
+
+	source: {
+		#dagger: input: true
+	}
+
+	host: string
+
+	url: {
+		string
+
+		#dagger: compute: [
+			{ do: "load", from: base },
+			{ do: "exec", args: ["sh", "-c", "echo -n 'https://\(host)/foo' > /tmp/out"] },
+			{ do: "export", format: "string", source: "/tmp/out" },
+		]
+	}
+}

examples/simple/values.cue

@@ -0,0 +1,3 @@
+package acme
+
+www: host: "acme.infralabs.io"

go.mod

@@ -0,0 +1,76 @@
+module dagger.cloud/go
+
+go 1.13
+
+require (
+	cuelang.org/go v0.3.0-alpha6
+	github.com/Azure/azure-sdk-for-go v16.2.1+incompatible // indirect
+	github.com/Azure/go-autorest v10.8.1+incompatible // indirect
+	github.com/KromDaniel/jonson v0.0.0-20180630143114-d2f9c3c389db
+	github.com/Shopify/logrus-bugsnag v0.0.0-20171204204709-577dee27f20d // indirect
+	github.com/aws/aws-sdk-go v1.15.11 // indirect
+	github.com/bitly/go-simplejson v0.5.0 // indirect
+	github.com/blang/semver v3.1.0+incompatible // indirect
+	github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 // indirect
+	github.com/bshuster-repo/logrus-logstash-hook v0.4.1 // indirect
+	github.com/bugsnag/bugsnag-go v0.0.0-20141110184014-b1d153021fcd // indirect
+	github.com/bugsnag/osext v0.0.0-20130617224835-0dd3f918b21b // indirect
+	github.com/bugsnag/panicwrap v0.0.0-20151223152923-e2c28503fcd0 // indirect
+	github.com/containerd/console v1.0.0
+	github.com/containerd/containerd v1.4.0-0.20191014053712-acdcf13d5eaf
+	github.com/denverdino/aliyungo v0.0.0-20190125010748-a747050bb1ba // indirect
+	github.com/dnaeon/go-vcr v1.0.1 // indirect
+	github.com/docker/cli v0.0.0-20200227165822-2298e6a3fe24
+	github.com/docker/distribution v2.7.1+incompatible
+	github.com/docker/docker v1.14.0-0.20190319215453-e7b5f7dbe98c // indirect
+	github.com/docker/go-metrics v0.0.0-20180209012529-399ea8c73916 // indirect
+	github.com/docker/libtrust v0.0.0-20150114040149-fa567046d9b1 // indirect
+	github.com/emicklei/proto v1.9.0 // indirect
+	github.com/garyburd/redigo v0.0.0-20150301180006-535138d7bcd7 // indirect
+	github.com/gofrs/uuid v3.3.0+incompatible
+	github.com/gorilla/handlers v0.0.0-20150720190736-60c7bfde3e33 // indirect
+	github.com/hashicorp/errwrap v0.0.0-20141028054710-7554cd9344ce // indirect
+	github.com/hashicorp/go-multierror v0.0.0-20161216184304-ed905158d874 // indirect
+	github.com/jmespath/go-jmespath v0.0.0-20160803190731-bd40a432e4c7 // indirect
+	github.com/machinebox/graphql v0.2.2
+	github.com/marstr/guid v1.1.0 // indirect
+	github.com/matryer/is v1.3.0 // indirect
+	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db
+	github.com/mitchellh/osext v0.0.0-20151018003038-5e2d6d41470f // indirect
+	github.com/moby/buildkit v0.7.1-0.20200529013301-643f0ffb5643
+	github.com/ncw/swift v1.0.47 // indirect
+	github.com/opencontainers/go-digest v1.0.0
+	github.com/opencontainers/runc v1.0.0-rc9.0.20200221051241-688cf6d43cc4 // indirect
+	github.com/opencontainers/runtime-tools v0.0.0-20181011054405-1d69bd0f9c39 // indirect
+	github.com/pkg/errors v0.9.1
+	github.com/prometheus/procfs v0.0.5 // indirect
+	github.com/rs/zerolog v1.17.2
+	github.com/satori/go.uuid v1.2.0 // indirect
+	github.com/spf13/cobra v1.0.0
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/viper v1.6.2
+	github.com/tonistiigi/fsutil v0.0.0-20200512175118-ae3a8d753069
+	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
+	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
+	github.com/xeipuuv/gojsonschema v0.0.0-20180618132009-1d523034197f // indirect
+	github.com/yvasiyarov/go-metrics v0.0.0-20140926110328-57bccd1ccd43 // indirect
+	github.com/yvasiyarov/gorelic v0.0.0-20141212073537-a9bba5b9ab50 // indirect
+	github.com/yvasiyarov/newrelic_platform_go v0.0.0-20140908184405-b21fdbd4370f // indirect
+	golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d
+	golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2 // indirect
+	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 // indirect
+	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
+	google.golang.org/api v0.0.0-20160322025152-9bf6e6e569ff // indirect
+	google.golang.org/cloud v0.0.0-20151119220103-975617b05ea8 // indirect
+	google.golang.org/grpc v1.27.1
+	gopkg.in/yaml.v3 v3.0.0-20200506231410-2ff61e1afc86 // indirect
+	k8s.io/kubernetes v1.13.0 // indirect
+)
+
+replace github.com/hashicorp/go-immutable-radix => github.com/tonistiigi/go-immutable-radix v0.0.0-20170803185627-826af9ccf0fe
+
+replace github.com/jaguilar/vt100 => github.com/tonistiigi/vt100 v0.0.0-20190402012908-ad4c4a574305
+
+replace github.com/containerd/containerd => github.com/containerd/containerd v1.3.1-0.20200227195959-4d242818bf55
+
+replace github.com/docker/docker => github.com/docker/docker v1.4.2-0.20200227233006-38f52c9fec82

go.sum

@@ -0,0 +1,444 @@
+bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cuelang.org/go v0.2.2 h1:i/wFo48WDibGHKQTRZ08nB8PqmGpVpQ2sRflZPj73nQ=
+cuelang.org/go v0.3.0-alpha4.0.20201118122203-cd621ffa2727 h1:9oH36KOs7IQwrSXlLhGRy6PPkiwBCC7pcbkTE1TmPwY=
+cuelang.org/go v0.3.0-alpha4.0.20201118122203-cd621ffa2727/go.mod h1:un6c4wnW3jEIrp97ARM3eJOlIJojP61ASQTRHyR0uiE=
+cuelang.org/go v0.3.0-alpha6 h1:UA+GMa6JdTMG2ywjBCbEzgPbZ4y4pudaFGvFSeZ9h8s=
+cuelang.org/go v0.3.0-alpha6/go.mod h1:NwRWsRzQvqkhCHdkIjFBKo9ujPd1OQLZzugDjElHh8Q=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+github.com/AkihiroSuda/containerd-fuse-overlayfs v0.0.0-20200512015515-32086ef23a5a/go.mod h1:RkqizX9+ro7Pp7RxEZAJWIr1/FrkZKCuUDi944JHt0U=
+github.com/Azure/azure-sdk-for-go v16.2.1+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
+github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
+github.com/Azure/go-autorest v10.8.1+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/KromDaniel/jonson v0.0.0-20180630143114-d2f9c3c389db h1:Zkf5kwhxdW0xV7WM/crqIcOP5LCFGnAmumWSFAewJ74=
+github.com/KromDaniel/jonson v0.0.0-20180630143114-d2f9c3c389db/go.mod h1:RU+6d0CNIRSp6yo1mXLIIrnFa/3LHhvcDVLVJyovptM=
+github.com/Microsoft/go-winio v0.4.15-0.20190919025122-fc70bd9a86b5/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
+github.com/Microsoft/hcsshim v0.8.9/go.mod h1:5692vkUqntj1idxauYlpoINNKeqCiG6Sg38RRsjT5y8=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/Shopify/logrus-bugsnag v0.0.0-20171204204709-577dee27f20d/go.mod h1:HI8ITrYtUY+O+ZhtlqUnD8+KwNPOyugEhfP9fdUIaEQ=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/apache/thrift v0.0.0-20161221203622-b2a4d4ae21c7/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/aws/aws-sdk-go v1.15.11/go.mod h1:mFuSZ37Z9YOHbQEwBWztmVzqXrEkub65tZoCYDt7FT0=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/bitly/go-simplejson v0.5.0/go.mod h1:cXHtHw4XUPsvGaxgjIAn8PhEWG9NfngEKAMDJEczWVA=
+github.com/blang/semver v3.1.0+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
+github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4=
+github.com/bshuster-repo/logrus-logstash-hook v0.4.1/go.mod h1:zsTqEiSzDgAa/8GZR7E1qaXrhYNDKBYy5/dWPTIflbk=
+github.com/bugsnag/bugsnag-go v0.0.0-20141110184014-b1d153021fcd/go.mod h1:2oa8nejYd4cQ/b0hMIopN0lCRxU0bueqREvZLWFrtK8=
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main.go

@@ -0,0 +1,43 @@
+// A simple main.go for testing the dagger Go API
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"dagger.cloud/go/dagger"
+)
+
+func main() {
+	ctx := context.TODO()
+	c, err := dagger.NewClient(ctx, "")
+	if err != nil {
+		fatal(err)
+	}
+
+	configPath := "."
+	if len(os.Args) > 1 {
+		configPath = os.Args[1]
+	}
+
+	if err := c.SetConfig(configPath); err != nil {
+		fatal(err)
+	}
+
+	// if err := c.ConnectInput("source", os.Getenv("HOME")+"/Documents/github/samalba/hello-go"); err != nil {
+	// 	fatal(err)
+	// }
+	if err := c.Run(ctx, "compute"); err != nil {
+		fatal(err)
+	}
+}
+
+func fatalf(msg string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, msg, args...)
+	os.Exit(1)
+}
+
+func fatal(msg interface{}) {
+	fatalf("%s\n", msg)
+}