commands/init: error if can't write Vagrantfile [GH-2660]

CHANGELOG.md

@@ -17,6 +17,7 @@ BUG FIXES:
     a login shell (regression). [GH-2636]
   - core: specifying `-t` or `-T` to `vagrant ssh -c` as extra args
     will properly enable/disable a TTY for OpenSSH. [GH-2618]
+  - commands/init: Error if can't write Vagrantfile to directory. [GH-2660]
   - guests/debian: fix `use_dhcp_assigned_default_route` to work properly.
     [GH-2648]
   - guests/debian,ubuntu: fix change\_host\_name for FQDNs with trailing

lib/vagrant/errors.rb

@@ -564,6 +564,10 @@ module Vagrant
       error_key(:vagrantfile_syntax_error)
     end
 
+    class VagrantfileWriteError < VagrantError
+      error_key(:vagrantfile_write_error)
+    end
+
     class VagrantVersionBad < VagrantError
       error_key(:vagrant_version_bad)
     end

plugins/commands/init/command.rb

@@ -38,8 +38,12 @@ module VagrantPlugins
 
         if save_path
           # Write out the contents
-          save_path.open("w+") do |f|
-            f.write(contents)
+          begin
+            save_path.open("w+") do |f|
+              f.write(contents)
+            end
+          rescue Errno::EACCES
+            raise Vagrant::Errors::VagrantfileWriteError
           end
 
           @env.ui.info(I18n.t("vagrant.commands.init.success"), prefix: false)

templates/locales/en.yml

@@ -676,6 +676,11 @@ en:
         message is reproduced below for convenience:
 
         %{file}
+      vagrantfile_write_error: |-
+        The user that is running Vagrant doesn't have the proper permissions
+        to write a Vagrantfile to the specified location. Please ensure that
+        you call `vagrant init` in a location where the proper permissions
+        are in place to create a Vagrantfile.
       vagrant_version_bad: |-
         This Vagrant environment has specified that it requires the Vagrant
         version to satisfy the following version requirements: