support dry-run for cp command

Signed-off-by: Guillaume Lours <[email protected]>

Author: glours

pkg/api/dryrunclient.go

@@ -18,9 +18,11 @@ package api
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"net"
 	"net/http"
+	"strings"
 
 	moby "github.com/docker/docker/api/types"
 	containerType "github.com/docker/docker/api/types/container"
@@ -35,6 +37,10 @@ import (
 	specs "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
+const (
+	DRYRUN_PREFIX = " DRY-RUN MODE - "
+)
+
 var _ client.APIClient = &DryRunClient{}
 
 type DryRunKey struct{}
@@ -95,11 +101,18 @@ func (d *DryRunClient) ContainerUnpause(ctx context.Context, container string) e
 }
 
 func (d *DryRunClient) CopyFromContainer(ctx context.Context, container, srcPath string) (io.ReadCloser, moby.ContainerPathStat, error) {
-	return nil, moby.ContainerPathStat{}, ErrNotImplemented
+	rc := io.NopCloser(strings.NewReader(""))
+	if _, err := d.ContainerStatPath(ctx, container, srcPath); err != nil {
+		return rc, moby.ContainerPathStat{}, fmt.Errorf(" %s Could not find the file %s in container %s", DRYRUN_PREFIX, srcPath, container)
+	}
+	return rc, moby.ContainerPathStat{}, nil
 }
 
 func (d *DryRunClient) CopyToContainer(ctx context.Context, container, path string, content io.Reader, options moby.CopyToContainerOptions) error {
-	return ErrNotImplemented
+	if _, err := d.ContainerStatPath(ctx, container, path); err != nil {
+		return fmt.Errorf(" %s Could not find the file %s in container %s", DRYRUN_PREFIX, path, container)
+	}
+	return nil
 }
 
 func (d *DryRunClient) ImageBuild(ctx context.Context, reader io.Reader, options moby.ImageBuildOptions) (moby.ImageBuildResponse, error) {

pkg/compose/compose.go

@@ -67,6 +67,7 @@ func (s *composeService) MaxConcurrency(i int) {
 }
 
 func (s *composeService) DryRunMode(ctx context.Context, dryRun bool) (context.Context, error) {
+	s.dryRun = dryRun
 	if dryRun {
 		cli, err := command.NewDockerCli()
 		if err != nil {

pkg/compose/cp.go

@@ -79,10 +79,18 @@ func (s *composeService) Copy(ctx context.Context, projectName string, options a
 	}
 
 	g := errgroup.Group{}
-	for _, container := range containers {
-		containerID := container.ID
+	for _, cont := range containers {
+		container := cont
 		g.Go(func() error {
-			return copyFunc(ctx, containerID, srcPath, dstPath, options)
+			err := copyFunc(ctx, container.ID, srcPath, dstPath, options)
+			if s.dryRun && err == nil {
+				fromOrInside := "inside"
+				if direction == fromService {
+					fromOrInside = "from"
+				}
+				fmt.Printf("Copy %s to path %s %s %s service container\n", srcPath, dstPath, fromOrInside, getCanonicalContainerName(container))
+			}
+			return err
 		})
 	}
 
@@ -194,14 +202,17 @@ func (s *composeService) copyToContainer(ctx context.Context, containerID string
 		// extracted. This function also infers from the source and destination
 		// info which directory to extract to, which may be the parent of the
 		// destination that the user specified.
-		dstDir, preparedArchive, err := archive.PrepareArchiveCopy(srcArchive, srcInfo, dstInfo)
-		if err != nil {
-			return err
-		}
-		defer preparedArchive.Close() //nolint:errcheck
+		// Don't create the archive if running in Dry Run mode
+		if !s.dryRun {
+			dstDir, preparedArchive, err := archive.PrepareArchiveCopy(srcArchive, srcInfo, dstInfo)
+			if err != nil {
+				return err
+			}
+			defer preparedArchive.Close() //nolint:errcheck
 
-		resolvedDstPath = dstDir
-		content = preparedArchive
+			resolvedDstPath = dstDir
+			content = preparedArchive
+		}
 	}
 
 	options := moby.CopyToContainerOptions{

pkg/progress/plain.go

@@ -20,6 +20,8 @@ import (
 	"context"
 	"fmt"
 	"io"
+
+	"github.com/docker/compose/v2/pkg/api"
 )
 
 type plainWriter struct {
@@ -40,7 +42,7 @@ func (p *plainWriter) Start(ctx context.Context) error {
 func (p *plainWriter) Event(e Event) {
 	prefix := ""
 	if p.dryRun {
-		prefix = "DRY RUN MODE - "
+		prefix = api.DRYRUN_PREFIX
 	}
 	fmt.Fprintln(p.out, prefix, e.ID, e.Text, e.StatusText)
 }
@@ -54,7 +56,7 @@ func (p *plainWriter) Events(events []Event) {
 func (p *plainWriter) TailMsgf(m string, args ...interface{}) {
 	prefix := ""
 	if p.dryRun {
-		prefix = DRYRUN_PREFIX
+		prefix = api.DRYRUN_PREFIX
 	}
 	fmt.Fprintln(p.out, append([]interface{}{prefix, m}, args...)...)
 }

pkg/progress/tty.go

@@ -25,6 +25,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/docker/compose/v2/pkg/api"
 	"github.com/docker/compose/v2/pkg/utils"
 
 	"github.com/buger/goterm"
@@ -110,7 +111,7 @@ func (w *ttyWriter) TailMsgf(msg string, args ...interface{}) {
 	defer w.mtx.Unlock()
 	msgWithPrefix := msg
 	if w.dryRun {
-		msgWithPrefix = strings.TrimSpace(DRYRUN_PREFIX + msg)
+		msgWithPrefix = strings.TrimSpace(api.DRYRUN_PREFIX + msg)
 	}
 	w.tailEvents = append(w.tailEvents, fmt.Sprintf(msgWithPrefix, args...))
 }
@@ -206,7 +207,7 @@ func lineText(event Event, pad string, terminalWidth, statusPadding int, color b
 	}
 	prefix := ""
 	if dryRun {
-		prefix = DRYRUN_PREFIX
+		prefix = api.DRYRUN_PREFIX
 	}
 
 	elapsed := endTime.Sub(event.startTime).Seconds()

pkg/progress/writer.go

@@ -28,10 +28,6 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
-const (
-	DRYRUN_PREFIX = " DRY-RUN MODE - "
-)
-
 // Writer can write multiple progress events
 type Writer interface {
 	Start(context.Context) error