Merge pull request #5924 from thaJeztah/hide_untagged

docker images --tree: hide both untagged and dangling images by default

Author: vvoland

cli/command/image/list.go

@@ -135,6 +135,14 @@ func runImages(ctx context.Context, dockerCLI command.Cli, options imagesOptions
 	return nil
 }
 
+// isDangling is a copy of [formatter.isDangling].
+func isDangling(img image.Summary) bool {
+	if len(img.RepoTags) == 0 && len(img.RepoDigests) == 0 {
+		return true
+	}
+	return len(img.RepoTags) == 1 && img.RepoTags[0] == "<none>:<none>" && len(img.RepoDigests) == 1 && img.RepoDigests[0] == "<none>@<none>"
+}
+
 // printAmbiguousHint prints an informational warning if the provided filter
 // argument is ambiguous.
 //

cli/command/image/tree.go

@@ -1,8 +1,12 @@
+// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
+//go:build go1.22
+
 package image
 
 import (
 	"context"
 	"fmt"
+	"slices"
 	"sort"
 	"strings"
 
@@ -38,6 +42,9 @@ func runTree(ctx context.Context, dockerCLI command.Cli, opts treeOptions) error
 	if err != nil {
 		return err
 	}
+	if !opts.all {
+		images = slices.DeleteFunc(images, isDangling)
+	}
 
 	view := treeView{
 		images: make([]topImage, 0, len(images)),