Provision directory with dangling symbolic link throws exception

[krystian-wojtas]

Vagrant version

% vagrant --version
Vagrant 2.2.7

Host operating system

% lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.4 LTS
Release:        18.04
Codename:       bionic

Guest operating system

vagrant@ubuntu-eoan:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=19.10
DISTRIB_CODENAME=eoan
DISTRIB_DESCRIPTION="Ubuntu 19.10"

Vagrantfile

Vagrant.configure("2") do |config|
  config.vm.box = "ubuntu/eoan64"
  config.vm.provision "file", source: "keys/", destination: "/home/vagrant/"
end

Debug output

https://gist.github.com/krystian-wojtas/8265ea032a5265df14261da8c61049d0

Expected behavior

Maybe it should at least print some nice error message?

Actual behavior

Throws exception.

Steps to reproduce

1. mkdir keys
2. ln -s does-not-exists keys/dangling-symlink
3. vagrant up