From bd105b69a8c5cef65d1fc1ca4255c94a0758186b Mon Sep 17 00:00:00 2001
From: Alexander Neumann <alexander@bumpern.de>
Date: Sun, 16 Nov 2014 15:30:08 +0100
Subject: [PATCH] Add debug() function to khepri cmd and lib

---
 cmd/khepri/debug.go |  2 +-
 debug.go            | 38 ++++++++++++++++++++++++++++++++++++++
 debug_release.go    |  5 +++++
 3 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 debug.go
 create mode 100644 debug_release.go

diff --git a/cmd/khepri/debug.go b/cmd/khepri/debug.go
index 687f0f162..bc60b8dad 100644
--- a/cmd/khepri/debug.go
+++ b/cmd/khepri/debug.go
@@ -26,7 +26,7 @@ func initDebugLogger() *log.Logger {
 
 	// open logger
 	l := log.New(io.MultiWriter(os.Stderr, f), "DEBUG: ", log.LstdFlags)
-	fmt.Fprintf(os.Stderr, "logging activated, writing log file %s", filename)
+	fmt.Fprintf(os.Stderr, "logging activated, writing log file %s\n", filename)
 	l.Printf("khepri %s", version)
 
 	return l
diff --git a/debug.go b/debug.go
new file mode 100644
index 000000000..cd4141dc3
--- /dev/null
+++ b/debug.go
@@ -0,0 +1,38 @@
+// +build debug
+
+package khepri
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+var version = "compiled manually"
+var debugLogger = initDebugLogger()
+
+func initDebugLogger() *log.Logger {
+	// create new log file
+	filename := fmt.Sprintf("khepri-debug-%d-%s",
+		os.Getpid(), time.Now().Format("20060201-150405"))
+	f, err := os.OpenFile(filepath.Join(os.TempDir(), filename),
+		os.O_WRONLY|os.O_CREATE, 0600)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "unable to create debug log file: %v", err)
+		os.Exit(2)
+	}
+
+	// open logger
+	l := log.New(io.MultiWriter(os.Stderr, f), "DEBUG: ", log.LstdFlags)
+	fmt.Fprintf(os.Stderr, "logging activated, writing log file %s\n", filename)
+	l.Printf("khepri %s", version)
+
+	return l
+}
+
+func debug(fmt string, args ...interface{}) {
+	debugLogger.Printf(fmt, args...)
+}
diff --git a/debug_release.go b/debug_release.go
new file mode 100644
index 000000000..21f2b24a5
--- /dev/null
+++ b/debug_release.go
@@ -0,0 +1,5 @@
+// +build !debug
+
+package khepri
+
+func debug(fmt string, args ...interface{}) {}