chore: add logging to bootstrap script

Author: sreya

cli/docker.go

@@ -655,6 +655,10 @@ func runDockerCVM(ctx context.Context, log slog.Logger, client dockerutil.Docker
 		// downloading the binary but before we can execute systemd remounts
 		// /tmp.
 		Env: []string{fmt.Sprintf("BINARY_DIR=%s", bootDir)},
+		StdOutErr: slogWriter{
+			ctx:    ctx,
+			Logger: log,
+		},
 	})
 	if err != nil {
 		return xerrors.Errorf("boostrap container: %w", err)
@@ -797,3 +801,13 @@ func isHomeDir(fpath string) bool {
 func shiftedID(id int) int {
 	return id + UserNamespaceOffset
 }
+
+type slogWriter struct {
+	ctx context.Context
+	slog.Logger
+}
+
+func (s slogWriter) Write(p []byte) (int, error) {
+	s.Debug(s.ctx, string(p))
+	return len(p), nil
+}

dockerutil/container.go

@@ -3,6 +3,7 @@ package dockerutil
 import (
 	"context"
 	"fmt"
+	"io"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -100,6 +101,7 @@ type BootstrapConfig struct {
 	Script      string
 	Env         []string
 	Detach      bool
+	StdOutErr   io.Writer
 }
 
 // BoostrapContainer runs a script inside the container as the provided user.
@@ -119,6 +121,7 @@ func BootstrapContainer(ctx context.Context, client DockerClient, conf Bootstrap
 			Args:        []string{"-s"},
 			Stdin:       strings.NewReader(conf.Script),
 			Env:         conf.Env,
+			StdOutErr:   conf.StdOutErr,
 		})
 		if err != nil {
 			err = xerrors.Errorf("boostrap container (%s): %w", out, err)