CALL:add type_if=tap

env
XENBUS_TYPE=vif
script=/etc/xen/scripts/vif-openvswitch
vif=vif9.0
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
PWD=/
LANG=en_US.UTF-8
XENBUS_PATH=backend/vif/9/0
NOTIFY_SOCKET=@/org/freedesktop/systemd1/notify
XENBUS_BASE_PATH=backend
SHLVL=1
INTERFACE=vif9.0-emu
netdev=
_=/usr/bin/env
offline type_if=vif
SUBSYSTEM=xen-backend
DRIVER=vif
XENBUS_TYPE=vif
DEVPATH=/devices/vif-9-0
script=/etc/xen/scripts/vif-openvswitch
vif=vif9.0
ACTION=offline
MODALIAS=xen-backend:vif
PWD=/
USEC_INITIALIZED=916041492
XENBUS_PATH=backend/vif/9/0
XENBUS_BASE_PATH=backend
SHLVL=1
UDEV_CALL=1
SEQNUM=3142
_=/usr/bin/env
offline type_if=vif
XENBUS_TYPE=vif
script=/etc/xen/scripts/vif-openvswitch
vif=vif9.0
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
PWD=/
LANG=en_US.UTF-8
XENBUS_PATH=backend/vif/9/0
NOTIFY_SOCKET=@/org/freedesktop/systemd1/notify
XENBUS_BASE_PATH=backend
SHLVL=1
INTERFACE=vif9.0-emu
netdev=
_=/usr/bin/env
remove type_if=tap
XENBUS_TYPE=vif
script=/etc/xen/scripts/vif-openvswitch
vif=vif9.0
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
PWD=/
LANG=en_US.UTF-8
XENBUS_PATH=backend/vif/9/0
NOTIFY_SOCKET=@/org/freedesktop/systemd1/notify
XENBUS_BASE_PATH=backend
SHLVL=1
INTERFACE=vif9.0-emu
netdev=
_=/usr/bin/env