From 499261eed5e9b8dbbab48be97f9c2c0716973264 Mon Sep 17 00:00:00 2001
From: Tonis Tiigi <tonistiigi@gmail.com>
Date: Fri, 13 Feb 2026 17:11:35 -0800
Subject: [PATCH] build: avoid empty line when -q used with --call

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
---
 commands/build.go |  2 +-
 tests/build.go    | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/commands/build.go b/commands/build.go
index b2a195916..7e8070160 100644
--- a/commands/build.go
+++ b/commands/build.go
@@ -411,7 +411,7 @@ func runBuild(ctx context.Context, dockerCli command.Cli, debugOpts debuggerOpti
 	case progressui.RawJSONMode:
 		// no additional display
 	case progressui.QuietMode:
-		if options.quiet {
+		if options.quiet && opts.CallFunc == nil {
 			fmt.Println(getImageID(resp.ExporterResponse))
 		}
 	default:
diff --git a/tests/build.go b/tests/build.go
index 5ab41f5ab..327f7ddb5 100644
--- a/tests/build.go
+++ b/tests/build.go
@@ -1379,6 +1379,33 @@ FROM second
 		require.Equal(t, 1, len(res.Sources))
 	})
 
+	// docker/buildx#3651
+	t.Run("outline-quiet-output", func(t *testing.T) {
+		dockerfile := []byte(`
+FROM busybox
+ARG FOO=bar
+`)
+		dir := tmpdir(
+			t,
+			fstest.CreateFile("Dockerfile", dockerfile, 0600),
+		)
+
+		runOutline := func(args ...string) string {
+			cmd := buildxCmd(sb, withArgs(args...))
+			var stdout bytes.Buffer
+			var stderr bytes.Buffer
+			cmd.Stdout = &stdout
+			cmd.Stderr = &stderr
+			require.NoError(t, cmd.Run(), stdout.String(), stderr.String())
+			return stdout.String()
+		}
+
+		quietOut := runOutline("build", "-q", "--call=outline", dir)
+		noneOut := runOutline("build", "--progress=none", "--call=outline", dir)
+		assert.Equal(t, noneOut, quietOut)
+		assert.False(t, strings.HasPrefix(quietOut, "\n"))
+	})
+
 	t.Run("targets", func(t *testing.T) {
 		dockerfile := []byte(`
 # build defines stage for compiling the binary