Add option for debug pprof service

src/cmds/restic/global_debug.go

@@ -0,0 +1,31 @@
+// +build debug
+
+package main
+
+import (
+	"fmt"
+	"net/http"
+	_ "net/http/pprof"
+	"os"
+)
+
+var (
+	listenMemoryProfile string
+)
+
+func init() {
+	f := cmdRoot.PersistentFlags()
+	f.StringVar(&listenMemoryProfile, "listen-profile", "", "listen on this `address:port` for memory profiling")
+}
+
+func runDebug() {
+	if listenMemoryProfile != "" {
+		fmt.Fprintf(os.Stderr, "running memory profile HTTP server on %v\n", listenMemoryProfile)
+		go func() {
+			err := http.ListenAndServe(listenMemoryProfile, nil)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "memory profile listen failed: %v\n", err)
+			}
+		}()
+	}
+}

src/cmds/restic/global_release.go

@@ -0,0 +1,6 @@
+// +build !debug
+
+package main
+
+// runDebug is a noop without the debug tag.
+func runDebug() {}

src/cmds/restic/main.go

@@ -22,6 +22,12 @@ directories in an encrypted repository stored on different backends.
 `,
 	SilenceErrors: true,
 	SilenceUsage:  true,
+
+	// run the debug functions for all subcommands (if build tag "debug" is
+	// enabled)
+	PersistentPreRun: func(*cobra.Command, []string) {
+		runDebug()
+	},
 }
 
 func init() {