code review 5967057: cmd/dist, sudo.bash: don't mention sudo.bash if cov and...

src/sudo.bash

 #!/usr/bin/env bash
 # Copyright 2009 The Go Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
 set -e
 
 case "`uname`" in
 Darwin)
         ;;
 *)
         exit 0
 esac
 
+eval $(go env)
+if ! [ -x $GOTOOLDIR/cov -a -x $GOTOOLDIR/prof ]; then
+        echo "You don't need to run sudo.bash." >&2
+        exit 2
+fi
+
 if [[ ! -d /usr/local/bin ]]; then
         echo 1>&2 'sudo.bash: problem with /usr/local/bin; cannot install tools.'
         exit 2
 fi
 
-eval $(go env)
 cd $(dirname $0)
 for i in prof cov
 do
         # Remove old binaries if present
         sudo rm -f /usr/local/bin/6$i
         # Install new binaries
         sudo cp $GOTOOLDIR/$i /usr/local/bin/go$i
         sudo chgrp procmod /usr/local/bin/go$i
         sudo chmod g+s /usr/local/bin/go$i
 done