tbs: moved ensureBuildkitd() higher in its file

internal/pkg/build/buildkit/client/client.go

@@ -88,6 +88,31 @@ func Run(ctx context.Context, opts *Opts, dest, spec string) {
 	}
 }
 
+// ensureBuildkitd checks if a buildkitd daemon is already running, and if not,
+// launches one. Once the server is ready, the value true will be sent over the
+// provided readyChan. Make sure this is a buffered channel with sufficient room
+// to avoid deadlocks.
+func ensureBuildkitd(ctx context.Context) string {
+	if isBuildkitdRunning(ctx) {
+		sylog.Infof("Found buildkitd already running at %q; will use that daemon.", bkDefaultSocket)
+		return bkDefaultSocket
+	}
+
+	sylog.Infof("Did not find usable running buildkitd daemon; spawning our own.")
+	socketChan := make(chan string, 1)
+	go func() {
+		if err := bkdaemon.Run(ctx, socketChan); err != nil {
+			sylog.Fatalf("buildkitd returned error: %v", err)
+		}
+	}()
+	go func() {
+		time.Sleep(bkLaunchTimeout)
+		socketChan <- ""
+	}()
+
+	return <-socketChan
+}
+
 // isBuildkitdRunning tries to determine whether there's already an instance of buildkitd running.
 func isBuildkitdRunning(ctx context.Context) bool {
 	c, err := client.New(ctx, bkDefaultSocket, client.WithFailFast())
@@ -222,28 +247,3 @@ func writeDockerTar(r io.Reader, outputFile *os.File) error {
 
 	return nil
 }
-
-// ensureBuildkitd checks if a buildkitd daemon is already running, and if not,
-// launches one. Once the server is ready, the value true will be sent over the
-// provided readyChan. Make sure this is a buffered channel with sufficient room
-// to avoid deadlocks.
-func ensureBuildkitd(ctx context.Context) string {
-	if isBuildkitdRunning(ctx) {
-		sylog.Infof("Found buildkitd already running at %q; will use that daemon.", bkDefaultSocket)
-		return bkDefaultSocket
-	}
-
-	sylog.Infof("Did not find usable running buildkitd daemon; spawning our own.")
-	socketChan := make(chan string, 1)
-	go func() {
-		if err := bkdaemon.Run(ctx, socketChan); err != nil {
-			sylog.Fatalf("buildkitd returned error: %v", err)
-		}
-	}()
-	go func() {
-		time.Sleep(bkLaunchTimeout)
-		socketChan <- ""
-	}()
-
-	return <-socketChan
-}