From 856d2896a7dce5d509f8438b81677a218a8125bb Mon Sep 17 00:00:00 2001
From: Matt Bell <mappum@gmail.com>
Date: Wed, 21 Jan 2015 15:18:45 -0800
Subject: [PATCH] commands: Added PreRun function to command

---
 cmd/ipfs/main.go    | 7 +++++++
 commands/command.go | 1 +
 2 files changed, 8 insertions(+)

diff --git a/cmd/ipfs/main.go b/cmd/ipfs/main.go
index 17d773ab2..e50a5ca16 100644
--- a/cmd/ipfs/main.go
+++ b/cmd/ipfs/main.go
@@ -315,6 +315,13 @@ func callCommand(ctx context.Context, req cmds.Request, root *cmds.Command, cmd
 		return nil, err
 	}
 
+	if cmd.PreRun != nil {
+		err = cmd.PreRun(req)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	if useDaemon {
 
 		cfg, err := req.Context().GetConfig()
diff --git a/commands/command.go b/commands/command.go
index 74beeec6e..f79bf31c0 100644
--- a/commands/command.go
+++ b/commands/command.go
@@ -45,6 +45,7 @@ type HelpText struct {
 type Command struct {
 	Options    []Option
 	Arguments  []Argument
+	PreRun     func(req Request) error
 	Run        Function
 	PostRun    func(res Response)
 	Marshalers map[EncodingType]Marshaler