command/push: ctrl-C should work properly

command/push.go

@@ -4,6 +4,8 @@ import (
 	"flag"
 	"fmt"
 	"io"
+	"os"
+	"os/signal"
 	"path/filepath"
 	"strings"
 
@@ -188,10 +190,17 @@ func (c *PushCommand) Run(args []string) int {
 		return 1
 	}
 
+	// Make a ctrl-C channel
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, os.Interrupt)
+	defer signal.Stop(sigCh)
+
 	err = nil
 	select {
 	case err = <-uploadErrCh:
 		err = fmt.Errorf("Error uploading: %s", err)
+	case <-sigCh:
+		err = fmt.Errorf("Push cancelled from Ctrl-C")
 	case <-doneCh:
 	}