Merge pull request #119 from cogitatio/feature/uac-support

Widnows users get UAC Prompt and fixes #40 thanks to @QWp6t (#86)

Author: cgsmith

README.md

@@ -82,7 +82,12 @@ To keep your /etc/hosts file unchanged simply add the line below to your `Vagran
 This disables vagrant-hostsupdater from running on **suspend** and **halt**.
 
 
-## Passwordless sudo
+## Suppressing prompts for elevating privileges
+
+These prompts exist to prevent anything that is being run by the user from inadvertently updating the hosts file. 
+If you understand the risks that go with supressing them, here's how to do it.
+
+### Linux/OS X: Passwordless sudo
 
 Add the following snippet to the top of the sudoers file using `sudo visudo`. It will make vagrant
 stop asking password when updating hosts file:
@@ -92,7 +97,12 @@ stop asking password when updating hosts file:
     Cmnd_Alias VAGRANT_HOSTS_REMOVE = /usr/bin/sed -i -e /*/ d /etc/hosts
     %admin ALL=(root) NOPASSWD: VAGRANT_HOSTS_ADD, VAGRANT_HOSTS_REMOVE
 
-        
+### Windows: UAC Prompt
+
+You can use `cacls` or `icacls` to grant your user account permanent write permission to the system's hosts file. 
+You have to open an elevated command prompt; hold `❖ Win` and press `X`, then choose "Command Prompt (Admin)"
+
+    cacls %SYSTEMROOT%\system32\drivers\etc\hosts /E /G %USERNAME%:W       
 
 ## Installing development version
 
@@ -117,6 +127,10 @@ vagrant plugin install vagrant-hostsupdater-*.gem
 
 ## Versions
 
+### next version
+* Bugfix: Windows users get UAC prompt [#40](/../../issues/40)
+* Misc: Added a note about suppressing UAC prompts
+
 ### 1.0.2
 * Feature: Added `remove_on_suspend` for `vagrant_halt` [#71](/../../issues/71)
 * Feature: Skip entries if they already exist [#69](/../../issues/69)

lib/vagrant-hostsupdater/HostsUpdater.rb

@@ -114,6 +114,15 @@ def addToHosts(entries)
             @ui.error "[vagrant-hostsupdater] Failed to add hosts, could not use sudo"
             adviseOnSudo
           end
+        elsif Vagrant::Util::Platform.windows?
+          require 'tmpdir'
+          uuid = @machine.id || @machine.config.hostsupdater.id
+          tmpPath = File.join(Dir.tmpdir, 'hosts-' + uuid + '.cmd')
+          File.open(tmpPath, "w") do |tmpFile|
+          entries.each { |line| tmpFile.puts(">>\"#{@@hosts_path}\" echo #{line}") }
+          end
+          sudo(tmpPath)
+          File.delete(tmpPath)
         else
           content = "\n" + content
           hostsFile = File.open(@@hosts_path, "a")
@@ -125,7 +134,7 @@ def addToHosts(entries)
       def removeFromHosts(options = {})
         uuid = @machine.id || @machine.config.hostsupdater.id
         hashedId = Digest::MD5.hexdigest(uuid)
-        if !File.writable_real?(@@hosts_path)
+        if !File.writable_real?(@@hosts_path) || Vagrant::Util::Platform.windows?
           if !sudo(%Q(sed -i -e '/#{hashedId}/ d' #@@hosts_path))
             @ui.error "[vagrant-hostsupdater] Failed to remove hosts, could not use sudo"
             adviseOnSudo
@@ -151,15 +160,19 @@ def signature(name, uuid = self.uuid)
       def sudo(command)
         return if !command
         if Vagrant::Util::Platform.windows?
-          `#{command}`
+          require 'win32ole'
+          args = command.split(" ")
+          command = args.shift
+          sh = WIN32OLE.new('Shell.Application')
+          sh.ShellExecute(command, args.join(" "), '', 'runas', 0)
         else
           return system("sudo #{command}")
         end
       end
 
       def adviseOnSudo
         @ui.error "[vagrant-hostsupdater] Consider adding the following to your sudoers file:"
-        @ui.error "[vagrant-hostsupdater]   https://github.com/cogitatio/vagrant-hostsupdater#passwordless-sudo"
+        @ui.error "[vagrant-hostsupdater]   https://github.com/cogitatio/vagrant-hostsupdater#suppressing-prompts-for-elevating-privileges"
       end
     end
   end