"vagrant ssh" fails with "percent_expand: unknown key %b"

[trombik]

Vagrant version

Vagrant 1.8.7.dev

Host operating system

Ubuntu jessie/sid

Guest operating system

Ubuntu 12.04 LTS

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :
Vagrant.configure("2") do |config|
  config.vm.box = "hashicorp/precise64"
end

Debug output

DEBUG ssh: Checking key permissions: /home/tomoyukis/github/trombik/foo%bar/vagrant/foo%bar/.vagrant/machines/default/virtualbox/private_key
 INFO ssh: Invoking SSH: ssh ["vagrant@127.0.0.1", "-p", "2201", "-o", "Compression=yes", "-o", "DSAAuthentication=yes", "-o", "LogLevel=FATAL", "-o", "IdentitiesOnly=yes", "-o", "StrictHostKeyChecking=no", "-o", "UserKnownHostsFile=/dev/null", "-i", "/home/tomoyukis/github/trombik/foo%bar/vagrant/foo%bar/.vagrant/machines/default/virtualbox/private_key"]
percent_expand: unknown key %b

Expected behavior

vagrant ssh --debug should succeed.

Actual behavior

ssh fails with "percent_expand: unknown key %b".

Steps to reproduce

mkdir foo%bar
cd foo%bar
vi Vagrantfile
vagrant up
vagrant ssh

References

[ghost]

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