Merge pull request #24 from blocklayerhq/zerolog

re-wire logging on top of zerolog
2021-01-13 19:08:04 -08:00 · 2021-01-13 19:08:04 -08:00 · d56846fb72
commit d56846fb72
parent e2a106ae39 d15ec726cf
20 changed files with 265 additions and 257 deletions
--- a/cmd/dagger/cmd/compute.go
+++ b/cmd/dagger/cmd/compute.go
@ -1,37 +1,45 @@
 package cmd

 import (
-	"context"
 	"fmt"

-	"dagger.cloud/go/cmd/dagger/ui"
+	"dagger.cloud/go/cmd/dagger/logger"
 	"dagger.cloud/go/dagger"
+
+	"github.com/moby/buildkit/util/appcontext"
+
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )

 var computeCmd = &cobra.Command{
 	Use:   "compute CONFIG",
 	Short: "Compute a configuration",
 	Args:  cobra.ExactArgs(1),
+	PreRun: func(cmd *cobra.Command, args []string) {
+		// Fix Viper bug for duplicate flags:
+		// https://github.com/spf13/viper/issues/233
+		if err := viper.BindPFlags(cmd.Flags()); err != nil {
+			panic(err)
+		}
+	},
 	Run: func(cmd *cobra.Command, args []string) {
-		ctx := context.TODO()
+		lg := logger.New()
+		ctx := lg.WithContext(appcontext.Context())
+
 		// FIXME: boot and bootdir should be config fields, not args
 		c, err := dagger.NewClient(ctx, "", "", args[0])
 		if err != nil {
-			ui.FatalErr(err)
+			lg.Fatal().Err(err).Msg("unable to create client")
 		}
 		// FIXME: configure which config to compute (duh)
 		// FIXME: configure inputs
-		ui.Info("Running")
+		lg.Info().Msg("running")
 		output, err := c.Compute(ctx)
 		if err != nil {
-			ui.FatalErr(err)
+			lg.Fatal().Err(err).Msg("failed to compute")
 		}
-		ui.Info("Processing output")
+		lg.Info().Msg("processing output")
 		fmt.Println(output.JSON())
 	},
 }
-
-func init() {
-	//	computeCmd.Flags().StringP("catalog", "c", "", "Cue package catalog")
-}
--- a/cmd/dagger/cmd/root.go
+++ b/cmd/dagger/cmd/root.go
@ -1,8 +1,11 @@
 package cmd

 import (
-	"dagger.cloud/go/cmd/dagger/ui"
+	"strings"
+
+	"dagger.cloud/go/cmd/dagger/logger"
 	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )

 var rootCmd = &cobra.Command{
@ -11,9 +14,9 @@ var rootCmd = &cobra.Command{
 }

 func init() {
-	// --debug
-	rootCmd.PersistentFlags().Bool("debug", false, "Enable debug mode")
-	// --workspace
+	rootCmd.PersistentFlags().String("log-format", "", "Log format (json, pretty). Defaults to json if the terminal is not a tty")
+	rootCmd.PersistentFlags().StringP("log-level", "l", "debug", "Log level")
+
 	rootCmd.AddCommand(
 		computeCmd,
 		// Create an env
@ -26,10 +29,19 @@ func init() {
 		//		computeCmd,
 		//		listCmd,
 	)
+
+	if err := viper.BindPFlags(rootCmd.PersistentFlags()); err != nil {
+		panic(err)
+	}
+	viper.SetEnvPrefix("dagger")
+	viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
+	viper.AutomaticEnv()
 }

 func Execute() {
+	lg := logger.New()
+
 	if err := rootCmd.Execute(); err != nil {
-		ui.FatalErr(err)
+		lg.Fatal().Err(err).Msg("failed to execute command")
 	}
 }
--- a/cmd/dagger/logger/logger.go
+++ b/cmd/dagger/logger/logger.go
@ -0,0 +1,51 @@
+// Logger utilities for the CLI
+//
+// These utilities rely on command line flags to set up the logger, therefore
+// they are tightly coupled with the CLI and should not be used outside.
+
+package logger
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/rs/zerolog"
+	"github.com/spf13/viper"
+	"golang.org/x/term"
+)
+
+func New() zerolog.Logger {
+	logger := zerolog.
+		New(os.Stderr).
+		With().
+		Timestamp().
+		Logger()
+
+	if prettyLogs() {
+		logger = logger.Output(zerolog.ConsoleWriter{Out: os.Stderr})
+	} else {
+		logger = logger.With().Timestamp().Caller().Logger()
+	}
+
+	level := viper.GetString("log-level")
+	lvl, err := zerolog.ParseLevel(level)
+	if err != nil {
+		panic(err)
+	}
+	return logger.Level(lvl)
+}
+
+func prettyLogs() bool {
+	switch f := viper.GetString("log-format"); f {
+	case "json":
+		return false
+	case "pretty":
+		return true
+	case "":
+		return term.IsTerminal(int(os.Stdout.Fd()))
+	default:
+		fmt.Fprintf(os.Stderr, "invalid --log-format %q\n", f)
+		os.Exit(1)
+	}
+	return false
+}
--- a/cmd/dagger/ui/ui.go
+++ b/cmd/dagger/ui/ui.go
@ -1,144 +0,0 @@
-package ui
-
-import (
-	"fmt"
-	"hash/adler32"
-	"io"
-	"os"
-	"unicode/utf8"
-
-	"github.com/mitchellh/colorstring"
-)
-
-var (
-	// Colorize is the main colorizer
-	Colorize = colorstring.Colorize{
-		Colors: colorstring.DefaultColors,
-		Reset:  true,
-	}
-)
-
-// Finfo prints an info message to w.
-func Finfo(w io.Writer, msg string, args ...interface{}) {
-	fmt.Fprintf(w, Colorize.Color("[bold][blue]info[reset] %s\n"), fmt.Sprintf(msg, args...))
-}
-
-// Info prints an info message.
-func Info(msg string, args ...interface{}) {
-	Finfo(os.Stdout, msg, args...)
-}
-
-// Fverbose prints a verbose message to w.
-func Fverbose(w io.Writer, msg string, args ...interface{}) {
-	fmt.Fprintf(w, Colorize.Color("[dim]%s\n"), fmt.Sprintf(msg, args...))
-}
-
-// Verbose prints a verbose message.
-func Verbose(msg string, args ...interface{}) {
-	Fverbose(os.Stdout, msg, args...)
-}
-
-// Fsuccess prints a success message to w.
-func Fsuccess(w io.Writer, msg string, args ...interface{}) {
-	fmt.Fprintf(w, Colorize.Color("[bold][green]success[reset] %s\n"), fmt.Sprintf(msg, args...))
-}
-
-// Success prints a success message.
-func Success(msg string, args ...interface{}) {
-	Fsuccess(os.Stdout, msg, args...)
-}
-
-// Fwrror prints an error message to w.
-func Ferror(w io.Writer, msg string, args ...interface{}) {
-	fmt.Fprintf(w, Colorize.Color("[bold][red]error[reset] %s\n"), fmt.Sprintf(msg, args...))
-}
-
-// Error prints an error message.
-func Error(msg string, args ...interface{}) {
-	Ferror(os.Stdout, msg, args...)
-}
-
-// Fwarning prints a warning message to w.
-func Fwarning(w io.Writer, msg string, args ...interface{}) {
-	fmt.Fprintf(os.Stderr, Colorize.Color("[bold][yellow]warning[reset] %s\n"), fmt.Sprintf(msg, args...))
-}
-
-// Warning prints a warning message.
-func Warning(msg string, args ...interface{}) {
-	Fwarning(os.Stdout, msg, args...)
-}
-
-// Ffatal prints an error message to w and exits.
-func Ffatal(w io.Writer, msg string, args ...interface{}) {
-	fmt.Fprintf(w, Colorize.Color("[bold][red]fatal[reset] %s\n"), fmt.Sprintf(msg, args...))
-	os.Exit(1)
-}
-
-// Fatal prints an error message and exits.
-func Fatal(msg string, args ...interface{}) {
-	Ffatal(os.Stderr, msg, args...)
-}
-
-// FfatalErr prints an error object to w and exits.
-func FfatalErr(w io.Writer, err error) {
-	Ffatal(w, "%v", err)
-}
-
-// FatalErr prints an error object and exits.
-func FatalErr(err error) {
-	FfatalErr(os.Stderr, err)
-}
-
-// Small returns a `small` colored string.
-func Small(msg string) string {
-	return Colorize.Color("[dim]" + msg)
-}
-
-// Primary returns a `primary` colored string.
-func Primary(msg string) string {
-	return Colorize.Color("[light_green]" + msg)
-}
-
-// Highlight returns a `highlighted` colored string.
-func Highlight(msg string) string {
-	return Colorize.Color("[cyan]" + msg)
-}
-
-// Truncate truncates a string to the given length
-func Truncate(msg string, length int) string {
-	for utf8.RuneCountInString(msg) > length {
-		msg = msg[0:len(msg)-4] + "…"
-	}
-	return msg
-}
-
-// HashColor returns a consistent color for a given string
-func HashColor(text string) string {
-	colors := []string{
-		"green",
-		"light_green",
-		"light_blue",
-		"blue",
-		"magenta",
-		"light_magenta",
-		"light_yellow",
-		"cyan",
-		"light_cyan",
-		"red",
-		"light_red",
-	}
-	h := adler32.Checksum([]byte(text))
-	return colors[int(h)%len(colors)]
-}
-
-// PrintLegend prints a demo of the ui functions
-func PrintLegend() {
-	Info("info message")
-	Success("success message")
-	Error("error message")
-	Warning("warning message")
-	Verbose("verbose message")
-	fmt.Printf("this is %s\n", Small("small"))
-	fmt.Printf("this is %s\n", Primary("primary"))
-	fmt.Printf("this is a %s\n", Highlight("highlight"))
-}
--- a/dagger/client.go
+++ b/dagger/client.go
@ -11,6 +11,8 @@ import (
 	"github.com/pkg/errors"
 	"golang.org/x/sync/errgroup"

+	"github.com/rs/zerolog/log"
+
 	// Cue
 	"cuelang.org/go/cue"

@ -80,12 +82,12 @@ func NewClient(ctx context.Context, host, boot, bootdir string) (*Client, error)
 	}, nil
 }

-func (c *Client) LocalDirs() ([]string, error) {
+func (c *Client) LocalDirs(ctx context.Context) ([]string, error) {
 	boot, err := c.BootScript()
 	if err != nil {
 		return nil, err
 	}
-	return boot.LocalDirs()
+	return boot.LocalDirs(ctx)
 }

 func (c *Client) BootScript() (*Script, error) {
@ -102,6 +104,8 @@ func (c *Client) BootScript() (*Script, error) {
 }

 func (c *Client) Compute(ctx context.Context) (*Value, error) {
+	lg := log.Ctx(ctx)
+
 	cc := &Compiler{}
 	out, err := cc.EmptyStruct()
 	if err != nil {
@ -140,7 +144,7 @@ func (c *Client) Compute(ctx context.Context) (*Value, error) {
 		})

 		eg.Go(func() error {
-			return c.dockerprintfn(dispCtx, eventsDockerPrint, os.Stderr)
+			return c.dockerprintfn(dispCtx, eventsDockerPrint, lg)
 		})
 	} else {
 		eg.Go(func() error {
@ -157,6 +161,8 @@ func (c *Client) Compute(ctx context.Context) (*Value, error) {
 }

 func (c *Client) buildfn(ctx context.Context, ch chan *bk.SolveStatus, w io.WriteCloser) error {
+	lg := log.Ctx(ctx)
+
 	boot, err := c.BootScript()
 	if err != nil {
 		return errors.Wrap(err, "assemble boot script")
@ -165,7 +171,7 @@ func (c *Client) buildfn(ctx context.Context, ch chan *bk.SolveStatus, w io.Writ
 	if err != nil {
 		return errors.Wrap(err, "serialize boot script")
 	}
-	debugf("client: assembled boot script: %s\n", bootSource)
+	lg.Debug().Bytes("bootSource", bootSource).Msg("assembled boot script")
 	// Setup solve options
 	opts := bk.SolveOpt{
 		FrontendAttrs: map[string]string{
@ -184,7 +190,7 @@ func (c *Client) buildfn(ctx context.Context, ch chan *bk.SolveStatus, w io.Writ
 		},
 	}
 	// Connect local dirs
-	localdirs, err := c.LocalDirs()
+	localdirs, err := c.LocalDirs(ctx)
 	if err != nil {
 		return errors.Wrap(err, "connect local dirs")
 	}
@ -199,14 +205,19 @@ func (c *Client) buildfn(ctx context.Context, ch chan *bk.SolveStatus, w io.Writ
 	}
 	for k, v := range resp.ExporterResponse {
 		// FIXME consume exporter response
-		fmt.Printf("exporter response: %s=%s\n", k, v)
+		lg.
+			Debug().
+			Str("key", k).
+			Str("value", v).
+			Msg("exporter response")
 	}
 	return nil
 }

 // Read tar export stream from buildkit Build(), and extract cue output
-func (c *Client) outputfn(_ context.Context, r io.Reader, out *Value) error {
-	defer debugf("outputfn complete")
+func (c *Client) outputfn(ctx context.Context, r io.Reader, out *Value) error {
+	lg := log.Ctx(ctx)
+
 	tr := tar.NewReader(r)
 	for {
 		h, err := tr.Next()
@ -216,11 +227,17 @@ func (c *Client) outputfn(_ context.Context, r io.Reader, out *Value) error {
 		if err != nil {
 			return errors.Wrap(err, "read tar stream")
 		}
+
+		lg := lg.
+			With().
+			Str("file", h.Name).
+			Logger()
+
 		if !strings.HasSuffix(h.Name, ".cue") {
-			debugf("skipping non-cue file from exporter tar stream: %s", h.Name)
+			lg.Debug().Msg("skipping non-cue file from exporter tar stream")
 			continue
 		}
-		debugf("outputfn: compiling & merging %q", h.Name)
+		lg.Debug().Msg("outputfn: compiling & merging")

 		cc := out.Compiler()
 		v, err := cc.Compile(h.Name, tr)
@ -230,7 +247,6 @@ func (c *Client) outputfn(_ context.Context, r io.Reader, out *Value) error {
 		if err := out.Fill(v); err != nil {
 			return errors.Wrap(err, h.Name)
 		}
-		debugf("outputfn: DONE: compiling & merging %q", h.Name)
 	}
 	return nil
 }
@ -254,7 +270,7 @@ func (n Node) ComponentPath() cue.Path {
 	return cue.MakePath(parts...)
 }

-func (n Node) Logf(msg string, args ...interface{}) {
+func (n Node) Logf(ctx context.Context, msg string, args ...interface{}) {
 	componentPath := n.ComponentPath().String()
 	args = append([]interface{}{componentPath}, args...)
 	if msg != "" && !strings.HasSuffix(msg, "\n") {
@ -263,34 +279,41 @@ func (n Node) Logf(msg string, args ...interface{}) {
 	fmt.Fprintf(os.Stderr, "[%s] "+msg, args...)
 }

-func (n Node) LogStream(nStream int, data []byte) {
-	var stream string
+func (n Node) LogStream(ctx context.Context, nStream int, data []byte) {
+	lg := log.
+		Ctx(ctx).
+		With().
+		Str("path", n.ComponentPath().String()).
+		Logger()
+
 	switch nStream {
 	case 1:
-		stream = "stdout"
+		lg = lg.With().Str("stream", "stdout").Logger()
 	case 2:
-		stream = "stderr"
+		lg = lg.With().Str("stream", "stderr").Logger()
 	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)
+		lg = lg.With().Str("stream", fmt.Sprintf("%d", nStream)).Logger()
 	}
+
+	lg.Debug().Msg(string(data))
 }

-func (n Node) LogError(errmsg string) {
-	n.Logf("ERROR: %s", bkCleanError(errmsg))
+func (n Node) LogError(ctx context.Context, errmsg string) {
+	log.
+		Ctx(ctx).
+		Error().
+		Str("path", n.ComponentPath().String()).
+		Msg(bkCleanError(errmsg))
 }

 func (c *Client) printfn(ctx context.Context, ch chan *bk.SolveStatus) error {
+	lg := log.Ctx(ctx)
+
 	// 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")
 	for {
 		select {
 		case <-ctx.Done():
@ -299,11 +322,13 @@ func (c *Client) printfn(ctx context.Context, ch chan *bk.SolveStatus) error {
 			if !ok {
 				return nil
 			}
-			debugf("status event: vertexes:%d statuses:%d logs:%d\n",
-				len(status.Vertexes),
-				len(status.Statuses),
-				len(status.Logs),
-			)
+			lg.
+				Debug().
+				Int("vertexes", len(status.Vertexes)).
+				Int("statuses", len(status.Statuses)).
+				Int("logs", len(status.Logs)).
+				Msg("status event")
+
 			for _, v := range status.Vertexes {
 				// FIXME: insert raw buildkit telemetry here (ie for debugging, etc.)

@ -320,12 +345,12 @@ func (c *Client) printfn(ctx context.Context, ch chan *bk.SolveStatus) error {
 				nodesByPath[n.Path.String()] = n
 				nodesByDigest[n.Digest.String()] = n
 				if n.Error != "" {
-					n.LogError(n.Error)
+					n.LogError(ctx, n.Error)
 				}
 			}
 			for _, log := range status.Logs {
 				if n, ok := nodesByDigest[log.Vertex.String()]; ok {
-					n.LogStream(log.Stream, log.Data)
+					n.LogStream(ctx, log.Stream, log.Data)
 				}
 			}
 			// debugJSON(status)
@ -351,7 +376,6 @@ func bkCleanError(msg string) string {
 }

 func (c *Client) dockerprintfn(ctx context.Context, ch chan *bk.SolveStatus, out io.Writer) error {
-	defer debugf("dockerprintfn complete")
 	var cons console.Console
 	// FIXME: use smarter writer from blr
 	return progressui.DisplaySolveStatus(ctx, "", cons, out, ch)
--- a/dagger/compiler.go
+++ b/dagger/compiler.go
@ -11,6 +11,7 @@ import (
 	cueerrors "cuelang.org/go/cue/errors"
 	cueload "cuelang.org/go/cue/load"
 	"github.com/pkg/errors"
+	"github.com/rs/zerolog/log"
 )

 // Polyfill for a cue runtime
@ -66,8 +67,8 @@ func (cc *Compiler) CompileScript(name string, src interface{}) (*Script, error)

 // Build a cue configuration tree from the files in fs.
 func (cc *Compiler) Build(ctx context.Context, fs FS, args ...string) (*Value, error) {
-	debugf("Compiler.Build")
-	defer debugf("COMPLETE: Compiler.Build")
+	lg := log.Ctx(ctx)
+
 	// 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.
@ -80,7 +81,7 @@ func (cc *Compiler) Build(ctx context.Context, fs FS, args ...string) (*Value, e
 	buildArgs := args

 	err := fs.Walk(ctx, func(p string, f Stat) error {
-		debugf("  Compiler.Build: processing %q", p)
+		lg.Debug().Str("path", p).Msg("Compiler.Build: processing")
 		if f.IsDir() {
 			return nil
 		}
--- a/dagger/component.go
+++ b/dagger/component.go
@ -67,10 +67,10 @@ func (c *Component) Execute(ctx context.Context, fs FS, out Fillable) (FS, error
 	return script.Execute(ctx, fs, out)
 }

-func (c *Component) Walk(fn func(*Op) error) error {
+func (c *Component) Walk(ctx context.Context, fn func(*Op) error) error {
 	script, err := c.ComputeScript()
 	if err != nil {
 		return err
 	}
-	return script.Walk(fn)
+	return script.Walk(ctx, fn)
 }
--- a/dagger/component_test.go
+++ b/dagger/component_test.go
@ -1,6 +1,7 @@
 package dagger

 import (
+	"context"
 	"testing"
 )

@ -31,7 +32,7 @@ func TestValidateSimpleComponent(t *testing.T) {
 		t.Fatal(err)
 	}
 	n := 0
-	if err := s.Walk(func(op *Op) error {
+	if err := s.Walk(context.TODO(), func(op *Op) error {
 		n++
 		return nil
 	}); err != nil {
--- a/dagger/compute.go
+++ b/dagger/compute.go
@ -6,17 +6,19 @@ import (

 	cueerrors "cuelang.org/go/cue/errors"
 	bkgw "github.com/moby/buildkit/frontend/gateway/client"
+	"github.com/rs/zerolog/log"
 )

 // Buildkit compute entrypoint (BK calls if "solve" or "build")
 // Use by wrapping in a buildkit client Build call, or buildkit frontend.
 func Compute(ctx context.Context, c bkgw.Client) (r *bkgw.Result, err error) {
+	lg := log.Ctx(ctx)
+
 	// FIXME: wrap errors to avoid crashing buildkit Build()
 	//    with cue error types (why??)
 	defer func() {
 		if err != nil {
 			err = fmt.Errorf("%s", cueerrors.Details(err, nil))
-			debugf("execute returned an error. Wrapping...")
 		}
 	}()
 	// Retrieve boot script form client
@ -24,12 +26,12 @@ func Compute(ctx context.Context, c bkgw.Client) (r *bkgw.Result, err error) {
 	if err != nil {
 		return nil, err
 	}
-	debugf("computing env")
+	lg.Debug().Msg("computing env")
 	// Compute output overlay
 	if err := env.Compute(ctx); err != nil {
 		return nil, err
 	}
-	debugf("exporting env")
+	lg.Debug().Msg("exporting env")
 	// Export env to a cue directory
 	outdir := NewSolver(c).Scratch()
 	outdir, err = env.Export(outdir)
--- a/dagger/env.go
+++ b/dagger/env.go
@ -8,6 +8,7 @@ import (
 	"cuelang.org/go/cue"
 	cueflow "cuelang.org/go/tools/flow"
 	"github.com/pkg/errors"
+	"github.com/rs/zerolog/log"
 )

 type Env struct {
@ -29,7 +30,14 @@ type Env struct {

 // Initialize a new environment
 func NewEnv(ctx context.Context, s Solver, bootsrc, inputsrc string) (*Env, error) {
-	debugf("NewEnv(boot=%q input=%q)", bootsrc, inputsrc)
+	lg := log.Ctx(ctx)
+
+	lg.
+		Debug().
+		Str("boot", bootsrc).
+		Str("input", inputsrc).
+		Msg("New Env")
+
 	cc := &Compiler{}
 	// 1. Compile & execute boot script
 	boot, err := cc.CompileScript("boot.cue", bootsrc)
@ -42,13 +50,13 @@ func NewEnv(ctx context.Context, s Solver, bootsrc, inputsrc string) (*Env, erro
 	}
 	// 2. load cue files produced by boot script
 	// FIXME: BuildAll() to force all files (no required package..)
-	debugf("building cue configuration from boot state")
+	lg.Debug().Msg("building cue configuration from boot state")
 	base, err := cc.Build(ctx, bootfs)
 	if err != nil {
 		return nil, errors.Wrap(err, "load base config")
 	}
 	// 3. Compile & merge input overlay (user settings, input directories, secrets.)
-	debugf("Loading input overlay")
+	lg.Debug().Msg("loading input overlay")
 	input, err := cc.Compile("input.cue", inputsrc)
 	if err != nil {
 		return nil, err
@ -58,7 +66,11 @@ func NewEnv(ctx context.Context, s Solver, bootsrc, inputsrc string) (*Env, erro
 		return nil, errors.Wrap(err, "merge base & input")
 	}

-	debugf("ENV: base=%q input=%q", base.JSON(), input.JSON())
+	lg.
+		Debug().
+		Str("base", base.JSON().String()).
+		Str("input", input.JSON().String()).
+		Msg("ENV")

 	return &Env{
 		base:  base,
@ -70,9 +82,12 @@ func NewEnv(ctx context.Context, s Solver, bootsrc, inputsrc string) (*Env, erro

 // Compute missing values in env configuration, and write them to state.
 func (env *Env) Compute(ctx context.Context) error {
-	debugf("Computing environment")
-	output, err := env.Walk(ctx, func(c *Component, out Fillable) error {
-		debugf("  [Env.Compute] processing %s", c.Value().Path().String())
+	output, err := env.Walk(ctx, func(ctx context.Context, c *Component, out Fillable) error {
+		lg := log.Ctx(ctx)
+
+		lg.
+			Debug().
+			Msg("[Env.Compute] processing")
 		_, err := c.Compute(ctx, env.s, out)
 		return err
 	})
@ -99,39 +114,53 @@ func (env *Env) Export(fs FS) (FS, error) {
 	return fs, nil
 }

-type EnvWalkFunc func(*Component, Fillable) error
+type EnvWalkFunc func(context.Context, *Component, Fillable) error

 // Walk components and return any computed values
 func (env *Env) Walk(ctx context.Context, fn EnvWalkFunc) (*Value, error) {
-	debugf("Env.Walk")
-	defer debugf("COMPLETE: Env.Walk")
-	l := sync.Mutex{}
+	lg := log.Ctx(ctx)
+
 	// Cueflow cue instance
 	// FIXME: make this cleaner in *Value by keeping intermediary instances
 	flowInst, err := env.base.CueInst().Fill(env.input.CueInst().Value())
 	if err != nil {
 		return nil, err
 	}
-	debugf("walking: \n----\n%s\n----\n", env.cc.Wrap(flowInst.Value(), flowInst).JSON())
+
+	lg.
+		Debug().
+		Str("value", env.cc.Wrap(flowInst.Value(), flowInst).JSON().String()).
+		Msg("walking")
+
 	// Initialize empty output
 	out, err := env.cc.EmptyStruct()
 	if err != nil {
 		return nil, err
 	}
+
+	l := sync.Mutex{}
+
 	// Cueflow config
 	flowCfg := &cueflow.Config{
 		UpdateFunc: func(c *cueflow.Controller, t *cueflow.Task) error {
 			l.Lock()
 			defer l.Unlock()
-			debugf("compute step")
+
 			if t == nil {
 				return nil
 			}
-			debugf("cueflow task %q: %s", t.Path().String(), t.State().String())
+
+			lg := lg.
+				With().
+				Str("path", t.Path().String()).
+				Str("state", t.State().String()).
+				Logger()
+
+			lg.Debug().Msg("cueflow task")
 			if t.State() != cueflow.Terminated {
 				return nil
 			}
-			debugf("cueflow task %q: filling result", t.Path().String())
+			lg.Debug().Msg("cueflow task: filling result")
 			// Merge task value into output
 			var err error
 			// FIXME: does cueflow.Task.Value() contain only filled values,
@ -147,7 +176,14 @@ func (env *Env) Walk(ctx context.Context, fn EnvWalkFunc) (*Value, error) {
 	flowMatchFn := func(v cue.Value) (cueflow.Runner, error) {
 		l.Lock()
 		defer l.Unlock()
-		debugf("Env.Walk: processing %s", v.Path().String())
+
+		lg := lg.
+			With().
+			Str("path", v.Path().String()).
+			Logger()
+		ctx := lg.WithContext(ctx)
+
+		lg.Debug().Msg("Env.Walk: processing")
 		val := env.cc.Wrap(v, flowInst)
 		c, err := val.Component()
 		if os.IsNotExist(err) {
@ -160,7 +196,8 @@ func (env *Env) Walk(ctx context.Context, fn EnvWalkFunc) (*Value, error) {
 		return cueflow.RunnerFunc(func(t *cueflow.Task) error {
 			l.Lock()
 			defer l.Unlock()
-			return fn(c, t)
+
+			return fn(ctx, c, t)
 		}), nil
 	}
 	// Orchestrate execution with cueflow
--- a/dagger/op.go
+++ b/dagger/op.go
@ -7,6 +7,7 @@ import (

 	"github.com/moby/buildkit/client/llb"
 	"github.com/pkg/errors"
+	"github.com/rs/zerolog/log"
 )

 type Op struct {
@ -21,14 +22,15 @@ func (op *Op) Execute(ctx context.Context, fs FS, out Fillable) (FS, error) {
 	return action(ctx, fs, out)
 }

-func (op *Op) Walk(fn func(*Op) error) error {
-	debugf("Walk %v", op.v)
+func (op *Op) Walk(ctx context.Context, fn func(*Op) error) error {
+	lg := log.Ctx(ctx)
+
+	lg.Debug().Interface("v", op.v).Msg("Op.Walk")
 	isCopy := (op.Validate("#Copy") == nil)
 	isLoad := (op.Validate("#Load") == nil)
 	if isCopy || isLoad {
-		debugf("MATCH %v", op.v)
 		if from, err := op.Get("from").Executable(); err == nil {
-			if err := from.Walk(fn); err != nil {
+			if err := from.Walk(ctx, fn); err != nil {
 				return err
 			}
 		}
@ -37,7 +39,7 @@ func (op *Op) Walk(fn func(*Op) error) error {
 	if err := op.Validate("#Exec"); err == nil {
 		return op.Get("mount").RangeStruct(func(k string, v *Value) error {
 			if from, err := op.Get("from").Executable(); err == nil {
-				if err := from.Walk(fn); err != nil {
+				if err := from.Walk(ctx, fn); err != nil {
 					return err
 				}
 			}
@ -75,7 +77,6 @@ func (op *Op) Action() (Action, error) {
 	}
 	for def, action := range actions {
 		if err := op.Validate(def); err == nil {
-			op.v.Debugf("OP MATCH: %s", def)
 			return action, nil
 		}
 	}
--- a/dagger/op_test.go
+++ b/dagger/op_test.go
@ -1,10 +1,13 @@
 package dagger

 import (
+	"context"
 	"testing"
 )

 func TestLocalMatch(t *testing.T) {
+	ctx := context.TODO()
+
 	cc := &Compiler{}
 	src := `do: "local", dir: "foo"`
 	v, err := cc.Compile("", src)
@ -16,7 +19,7 @@ func TestLocalMatch(t *testing.T) {
 		t.Fatal(err)
 	}
 	n := 0
-	err = op.Walk(func(op *Op) error {
+	err = op.Walk(ctx, func(op *Op) error {
 		n++
 		return nil
 	})
@ -29,6 +32,8 @@ func TestLocalMatch(t *testing.T) {
 }

 func TestCopyMatch(t *testing.T) {
+	ctx := context.TODO()
+
 	cc := &Compiler{}
 	src := `do: "copy", from: [{do: "local", dir: "foo"}]`
 	v, err := cc.Compile("", src)
@ -43,7 +48,7 @@ func TestCopyMatch(t *testing.T) {
 		t.Fatal(err)
 	}
 	n := 0
-	err = op.Walk(func(op *Op) error {
+	err = op.Walk(ctx, func(op *Op) error {
 		n++
 		return nil
 	})
--- a/dagger/script.go
+++ b/dagger/script.go
@ -41,22 +41,22 @@ func (s *Script) Execute(ctx context.Context, fs FS, out Fillable) (FS, error) {
 	return fs, err
 }

-func (s *Script) Walk(fn func(op *Op) error) error {
+func (s *Script) Walk(ctx context.Context, fn func(op *Op) error) error {
 	return s.v.RangeList(func(idx int, v *Value) error {
 		op, err := v.Op()
 		if err != nil {
 			return errors.Wrapf(err, "validate op %d/%d", idx+1, s.v.Len())
 		}
-		if err := op.Walk(fn); err != nil {
+		if err := op.Walk(ctx, fn); err != nil {
 			return err
 		}
 		return nil
 	})
 }

-func (s *Script) LocalDirs() ([]string, error) {
+func (s *Script) LocalDirs(ctx context.Context) ([]string, error) {
 	var dirs []string
-	err := s.Walk(func(op *Op) error {
+	err := s.Walk(ctx, func(op *Op) error {
 		if err := op.Validate("#Local"); err != nil {
 			return nil
 		}
--- a/dagger/script_test.go
+++ b/dagger/script_test.go
@ -1,6 +1,7 @@
 package dagger

 import (
+	"context"
 	"strings"
 	"testing"
 )
@ -17,6 +18,8 @@ func TestValidateEmptyValue(t *testing.T) {
 }

 func TestLocalScript(t *testing.T) {
+	ctx := context.TODO()
+
 	cc := &Compiler{}
 	src := `[{do: "local", dir: "foo"}]`
 	v, err := cc.Compile("", src)
@ -28,7 +31,7 @@ func TestLocalScript(t *testing.T) {
 		t.Fatal(err)
 	}
 	n := 0
-	err = s.Walk(func(op *Op) error {
+	err = s.Walk(ctx, func(op *Op) error {
 		n++
 		return nil
 	})
@ -41,6 +44,8 @@ func TestLocalScript(t *testing.T) {
 }

 func TestWalkBootScript(t *testing.T) {
+	ctx := context.TODO()
+
 	cc := &Compiler{}
 	cfg, err := cc.Compile("clientconfig.cue", defaultBootScript)
 	if err != nil {
@ -50,7 +55,7 @@ func TestWalkBootScript(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	dirs, err := script.LocalDirs()
+	dirs, err := script.LocalDirs(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
@ -64,6 +69,8 @@ func TestWalkBootScript(t *testing.T) {

 func TestWalkBiggerScript(t *testing.T) {
 	t.Skip("FIXME")
+
+	ctx := context.TODO()
 	cc := &Compiler{}
 	script, err := cc.CompileScript("boot.cue", `
 [
@ -102,7 +109,7 @@ func TestWalkBiggerScript(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	dirs, err := script.LocalDirs()
+	dirs, err := script.LocalDirs(ctx)
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/dagger/spec.go
+++ b/dagger/spec.go
@ -1,10 +1,9 @@
 package dagger

 import (
-	"fmt"
-
 	"cuelang.org/go/cue"
 	cueerrors "cuelang.org/go/cue/errors"
+	"github.com/pkg/errors"
 )

 // Cue spec validator
@ -18,8 +17,7 @@ func (s Spec) Validate(v *Value, defpath string) (err error) {
 	// FIXME: there is probably a cleaner way to do this.
 	defer func() {
 		if err != nil {
-			//debugf("ERROR while validating %v against %v err=%q", v, defpath, err)
-			err = fmt.Errorf("%s", cueerrors.Details(err, nil))
+			err = errors.New(cueerrors.Details(err, nil))
 		}
 	}()

--- a/dagger/types.go
+++ b/dagger/types.go
@ -7,7 +7,7 @@ import (
 // Implemented by Component, Script, Op
 type Executable interface {
 	Execute(context.Context, FS, Fillable) (FS, error)
-	Walk(func(*Op) error) error
+	Walk(context.Context, func(*Op) error) error
 }

 // Something which can be filled in-place with a cue value
--- a/dagger/utils.go
+++ b/dagger/utils.go
@ -3,24 +3,14 @@ package dagger
 import (
 	"crypto/rand"
 	"fmt"
-	"os"
-	"strings"

 	"cuelang.org/go/cue"
 	cueerrors "cuelang.org/go/cue/errors"
+	"github.com/pkg/errors"
 )

 func cueErr(err error) error {
-	return fmt.Errorf("%s", cueerrors.Details(err, &cueerrors.Config{}))
-}
-
-func debugf(msg string, args ...interface{}) {
-	if !strings.HasSuffix(msg, "\n") {
-		msg += "\n"
-	}
-	if os.Getenv("DEBUG") != "" {
-		fmt.Fprintf(os.Stderr, msg, args...)
-	}
+	return errors.New(cueerrors.Details(err, &cueerrors.Config{}))
 }

 func randomID(size int) (string, error) {
--- a/dagger/value.go
+++ b/dagger/value.go
@ -319,12 +319,6 @@ func (v *Value) Compiler() *Compiler {
 	return v.cc
 }

-func (v *Value) Debugf(msg string, args ...interface{}) {
-	prefix := v.Path().String()
-	args = append([]interface{}{prefix}, args...)
-	debugf("%s: "+msg, args...)
-}
-
 func (v *Value) Wrap(v2 cue.Value) *Value {
 	return wrapValue(v2, v.inst, v.cc)
 }
--- a/go.mod
+++ b/go.mod
@ -10,9 +10,12 @@ require (
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db
 	github.com/moby/buildkit v0.8.1
 	github.com/pkg/errors v0.9.1
+	github.com/rs/zerolog v1.20.0
 	github.com/spf13/cobra v1.0.0
+	github.com/spf13/viper v1.7.0
 	github.com/tonistiigi/fsutil v0.0.0-20201103201449-0834f99b7b85
 	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
+	golang.org/x/term v0.0.0-20201117132131-f5c789dd3221
 	gopkg.in/yaml.v3 v3.0.0-20200506231410-2ff61e1afc86 // indirect
 )

--- a/go.sum
+++ b/go.sum
@ -312,6 +312,7 @@ github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI
 github.com/fortytw2/leaktest v1.2.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
+github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/garyburd/redigo v0.0.0-20150301180006-535138d7bcd7/go.mod h1:NR3MbYisc3/PwhQ00EMzDiPmrwpPxAn5GI05/YaO1SY=
 github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
@ -461,6 +462,7 @@ github.com/googleapis/gnostic v0.2.2/go.mod h1:sJBsCZ4ayReDTBIg8b9dl28c5xFWyhBTV
 github.com/googleapis/gnostic v0.4.1/go.mod h1:LRhVm6pbyptWbWbuZ38d1eyptfvIytN3ir6b65WBswg=
 github.com/gookit/color v1.2.4/go.mod h1:AhIE+pS6D4Ql0SQWbBeXPHw7gY0/sjHoA4s/n1KB7xg=
 github.com/gophercloud/gophercloud v0.1.0/go.mod h1:vxM41WHh5uqHVBMZHzuwNOHh8XEoIEcSTewFxm1c5g8=
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGaHF6qqu48+N2wcFQ5qg5FXgOdqsJ5d8=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/goreleaser/goreleaser v0.136.0/go.mod h1:wiKrPUeSNh6Wu8nUHxZydSOVQ/OZvOaO7DTtFqie904=
 github.com/goreleaser/nfpm v1.2.1/go.mod h1:TtWrABZozuLOttX2uDlYyECfQX7x5XYkVxhjYcR6G9w=
@ -514,6 +516,7 @@ github.com/hashicorp/go.net v0.0.1/go.mod h1:hjKkEWcCURg++eb33jQU7oqQcI9XDCnUzHA
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.3/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
+github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
 github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
@ -551,6 +554,7 @@ github.com/json-iterator/go v1.1.8/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/u
 github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
 github.com/jstemmer/go-junit-report v0.9.1/go.mod h1:Brl9GWCQeLvo8nXZwPNNblvFj/XSXhF0NWZEnDohbsk=
+github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
 github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
@ -583,6 +587,7 @@ github.com/lib/pq v1.2.0 h1:LXpIM/LZ5xGFhOpXAQUIMM1HdyqzVYM13zNdjCEEcA0=
 github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/logrusorgru/aurora v0.0.0-20181002194514-a7b3b318ed4e/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mailru/easyjson v0.0.0-20160728113105-d5b7844b561a/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
 github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
@ -626,6 +631,7 @@ github.com/mitchellh/hashstructure v1.0.0/go.mod h1:QjSHrPWS+BGUVBYkbTZWEnOh3G1D
 github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0QubkSMEySY=
 github.com/mitchellh/mapstructure v0.0.0-20160808181253-ca63d7c062ee/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/mitchellh/mapstructure v1.3.1 h1:cCBH2gTD2K0OtLlv/Y5H01VQCqmlDxz30kS5Y5bqfLA=
 github.com/mitchellh/mapstructure v1.3.1/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/mitchellh/osext v0.0.0-20151018003038-5e2d6d41470f/go.mod h1:OkQIRizQZAeMln+1tSwduZz7+Af5oFlKirV/MSYes2A=
 github.com/moby/buildkit v0.8.1 h1:zrGxLwffKM8nVxBvaJa7H404eQLfqlg1GB6YVIzXVQ0=
@ -711,6 +717,7 @@ github.com/openzipkin/zipkin-go v0.1.6/go.mod h1:QgAqvLzwWbR/WpD4A3cGpPtJrZXNIiJ
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
 github.com/pborman/uuid v1.2.0/go.mod h1:X/NO0urCmaxf9VXbdlT7C2Yzkj2IKimNn4k+gtPdI/k=
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
+github.com/pelletier/go-toml v1.8.0 h1:Keo9qb7iRJs2voHvunFtuuYFsbWeOBh8/P9v/kVMFtw=
 github.com/pelletier/go-toml v1.8.0/go.mod h1:D6yutnOGMveHEPV7VQOuvI/gXY61bv+9bAOTRnLElKs=
 github.com/peterbourgon/diskv v2.0.1+incompatible/go.mod h1:uqqh8zWWbv1HBMNONnaR/tNboyR3/BZd58JJSHlUSCU=
 github.com/phayes/checkstyle v0.0.0-20170904204023-bfd46e6a821d/go.mod h1:3OzsM7FXDQlpCiw2j81fOmAwQLnZnLGXVKUzeKQXIAw=
@ -764,6 +771,8 @@ github.com/rogpeppe/go-internal v1.5.2/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTE
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@ -794,9 +803,11 @@ github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrf
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@ -804,8 +815,10 @@ github.com/sourcegraph/go-diff v0.5.1/go.mod h1:j2dHj3m8aZgQO8lMTcTnBcXkRRRqi34c
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@ -813,6 +826,7 @@ github.com/spf13/cobra v0.0.5/go.mod h1:3K3wKZymM7VvHMDS9+Akkh4K60UwM26emMESw8tL
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@ -823,6 +837,7 @@ github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
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@ -835,6 +850,7 @@ github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UV
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@ -1148,6 +1164,7 @@ golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0/go.mod h1:/rFqwRUd4F7ZHNgw
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@ -1261,6 +1278,7 @@ gopkg.in/gcfg.v1 v1.2.0/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
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