From 3aaf2914094d91161d788dc596f6c9a4589f94d9 Mon Sep 17 00:00:00 2001
From: Olaoluwa Osuntokun <laolu32@gmail.com>
Date: Wed, 25 Jan 2017 18:29:24 -0800
Subject: [PATCH] cmd/lncli: [describegraph] -- if rendering fails, display
 error

---
 cmd/lncli/commands.go | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/cmd/lncli/commands.go b/cmd/lncli/commands.go
index 1df1a6d0..4368d0a1 100644
--- a/cmd/lncli/commands.go
+++ b/cmd/lncli/commands.go
@@ -918,18 +918,29 @@ func drawChannelGraph(graph *lnrpc.ChannelGraph) error {
 		return err
 	}
 
+	var errBuffer bytes.Buffer
+
 	// Once our dot file has been written to disk, we can use the dot
 	// command itself to generate the drawn rendering of the graph
 	// described.
 	drawCmd := exec.Command("dot", "-T"+"svg", "-o"+imageFile.Name(),
 		tempDotFile.Name())
+	drawCmd.Stderr = &errBuffer
 	if err := drawCmd.Run(); err != nil {
+		fmt.Println("error rendering graph: ", errBuffer.String())
+		fmt.Println("dot: ", graphDotString)
+
 		return err
 	}
 
+	errBuffer.Reset()
+
 	// Finally, we'll open the drawn graph to display to the user.
 	openCmd := exec.Command("open", imageFile.Name())
+	openCmd.Stderr = &errBuffer
 	if err := openCmd.Run(); err != nil {
+		fmt.Println("error opening rendered graph image: ",
+			errBuffer.String())
 		return err
 	}