commands/ssh-config: fix for multiple private keys

since we merged multiple private keys, the :private_key_path item of
ssh_info now comes back as an array. the ssh-config command had not yet
been updated to handle this properly.

here we fix that oversight and add a few unit tests around the config
generation.

templates/commands/ssh_config/config.erb

@@ -5,10 +5,12 @@ Host <%= host_key %>
   UserKnownHostsFile /dev/null
   StrictHostKeyChecking no
   PasswordAuthentication no
-<% if private_key_path.include?(" ") -%>
-  IdentityFile "<%= private_key_path %>"
+<% private_key_path.each do |path| %>
+<% if path.include?(" ") -%>
+  IdentityFile "<%= path %>"
 <% else -%>
-  IdentityFile <%= private_key_path %>
+  IdentityFile <%= path %>
+<% end -%>
 <% end -%>
   IdentitiesOnly yes
   LogLevel FATAL

test/unit/plugins/commands/ssh_config/command_test.rb

@@ -0,0 +1,77 @@
+require File.expand_path("../../../../base", __FILE__)
+
+describe "VagrantPlugins::CommandSSHConfig::Command" do
+  include_context "unit"
+  include_context "virtualbox"
+
+  let(:described_class) { Vagrant.plugin("2").manager.commands[:"ssh-config"] }
+
+  let(:argv)     { [] }
+  let(:env)      { Vagrant::Environment.new }
+  let(:machine)  { double("Vagrant::Machine", :name => nil) }
+  let(:ssh_info) {{
+    :host             => "testhost.vagrant.dev",
+    :port             => 1234,
+    :username         => "testuser",
+    :private_key_path => [],
+    :forward_agent    => false,
+    :forward_x11      => false
+  }}
+
+  subject { described_class.new(argv, env) }
+
+  before do
+    subject.stub(:with_target_vms) { |&block| block.call machine }
+  end
+
+  describe "execute" do
+    it "prints out the ssh config for the given machine" do
+      machine.stub(:ssh_info) { ssh_info }
+      subject.should_receive(:safe_puts).with(<<-SSHCONFIG)
+Host vagrant
+  HostName testhost.vagrant.dev
+  User testuser
+  Port 1234
+  UserKnownHostsFile /dev/null
+  StrictHostKeyChecking no
+  PasswordAuthentication no
+  IdentitiesOnly yes
+  LogLevel FATAL
+      SSHCONFIG
+      subject.execute
+    end
+
+    it "turns on agent forwarding when it is configured" do
+      machine.stub(:ssh_info) { ssh_info.merge(:forward_agent => true) }
+      subject.should_receive(:safe_puts).with { |ssh_config|
+        ssh_config.should include("ForwardAgent yes")
+      }
+      subject.execute
+    end
+
+    it "turns on x11 forwarding when it is configured" do
+      machine.stub(:ssh_info) { ssh_info.merge(:forward_x11 => true) }
+      subject.should_receive(:safe_puts).with { |ssh_config|
+        ssh_config.should include("ForwardX11 yes")
+      }
+      subject.execute
+    end
+
+    it "handles multiple private key paths" do
+      machine.stub(:ssh_info) { ssh_info.merge(:private_key_path => ["foo", "bar"]) }
+      subject.should_receive(:safe_puts).with { |ssh_config|
+        ssh_config.should include("IdentityFile foo")
+        ssh_config.should include("IdentityFile bar")
+      }
+      subject.execute
+    end
+
+    it "puts quotes around an identityfile path if it has a space" do
+      machine.stub(:ssh_info) { ssh_info.merge(:private_key_path => ["with a space"]) }
+      subject.should_receive(:safe_puts).with { |ssh_config|
+        ssh_config.should include('IdentityFile "with a space"')
+      }
+      subject.execute
+    end
+  end
+end