From 7d8bacdc90fd97329630223f630df16fc12cae1b Mon Sep 17 00:00:00 2001
From: Solderpunk <solderpunk@sdf.org>
Date: Mon, 6 Jul 2020 16:13:56 +0200
Subject: [PATCH] Log stderr from CGI processes which exit with non-zero status
 to the error log.  Closes #7.

---
 dynamic.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dynamic.go b/dynamic.go
index d89d6a2..02d38cf 100644
--- a/dynamic.go
+++ b/dynamic.go
@@ -64,7 +64,10 @@ func handleCGI(config Config, path string, cgiPath string, URL *url.URL, log *Lo
 		return
 	}
 	if err != nil {
-		errorLog.Println("Error starting CGI executable " + path + ": " + err.Error())
+		errorLog.Println("Error running CGI program " + path + ": " + err.Error())
+		if err, ok := err.(*exec.ExitError); ok {
+			errorLog.Println("↳ stderr output: " + string(err.Stderr))
+		}
 		conn.Write([]byte("42 CGI error!\r\n"))
 		log.Status = 42
 		return