Add ability to specify existing tap interface in test-machine

Also, create new tap as tap9 instead of tap0.

1 files changed, 2 insertions, 1 deletions

diff --git a/upload-machine b/upload-machine
index cffcd7b..8d6e730 100755
--- a/upload-machine
+++ b/upload-machine
@@ -14,7 +14,8 @@ usage="usage: $0 [<options>] <host> <new-subvol> [<old-subvol>]"
 
 owd="$(pwd)"
 trap "{ cd '$owd'; exit 1; }" ERR
-set -o errtrace # Trap in functions.
+set -o errtrace -o pipefail # Trap in functions.
+                            # Fail if any pipe command fails.
 
 function info () { echo "$*" 1>&2; }
 function error () { info "$*"; exit 1; }