This fixes an issue when the interface being configured is the
interface through which ssh traffic is forwarded.
In a complex scenario, one needs to disable the default interface for
NAT, and use other interface for ssh. In this case, when vagrant run
`ifconfig #{ifname} inet delete`, the second ifconfig that is supposed
to restore interface settings will never be called. This might be a rare
need, but it is also strongly recommended to use `netstart` when
reconfiguring interfaces after updating `hostname.if(5)`.
The issue can be triggered when ssh connection has issues between two
`ifconfig` commands.
This fixes a fairly large tempfile leak. Vagrant uses a template
renderer to write network configuration files locally to disk. Then,
that temporarily file is uploaded to the remote host and moved into
place. Since Vagrant is such a short-lived process, GC never came along
and cleaned up those tempfiles, resulting in many temporary files being
created through regular Vagrant usage.
The Util::Tempfile class uses a block to ensure the temporary file is
deleted when the block finishes. This API required small tweaks to the
usage, but provides more safety to ensure the files are deleted.
Tomoyuki Sakurai
Seth Vargo
Kalman Hazins
Mitchell Hashimoto
Maximilian Fischer
Tomoyuki Sahara