The following items are new for Chef Infra Client 12.17 and/or are changes from previous versions. The short version:

- **Added msu_package resource**
- **Added alias unmount to umount action for mount resource**
- **Can now delete multiple nodes/clients in knife**
- **Haskell language plugin added to Ohai**

## msu_package resource

The **msu_package** resource installs or removes Microsoft Update(MSU) packages on Microsoft Windows machines. Here are some examples:

**Using local path in source**

```ruby
msu_package 'Install Windows 2012R2 Update KB2959977' do
  source 'C:\Users\xyz\AppData\Local\Temp\Windows8.1-KB2959977-x64.msu'
  action :install
end
```

```ruby
msu_package 'Remove Windows 2012R2 Update KB2959977' do
  source 'C:\Users\xyz\AppData\Local\Temp\Windows8.1-KB2959977-x64.msu'
  action :remove
end
```

**Using URL in source**

```ruby
msu_package 'Install Windows 2012R2 Update KB2959977' do
  source 'https://s3.amazonaws.com/my_bucket/Windows8.1-KB2959977-x64.msu'
  action :install
end
```

```ruby
msu_package 'Remove Windows 2012R2 Update KB2959977' do
  source 'https://s3.amazonaws.com/my_bucket/Windows8.1-KB2959977-x64.msu'
  action :remove
end
```

## `unmount` alias for `umount` action

Now you can use `action :unmount` to unmount a mount point through the mount resource. For example:

```ruby
mount '/mount/tmp' do
  action :unmount
end
```

## Multiple client/node deletion in knife

You can now pass multiple nodes/clients to `knife node delete` or `knife client delete` subcommands.

```bash
knife client delete client1,client2,client3
```

## Ohai Enhancements

### Haskell Language plugin

Haskell is now detected in a new haskell language plugin:

```javascript
"languages": {
  "haskell": {
    "stack": {
      "version": "1.2.0",
      "description": "Version 1.2.0 x86_64 hpack-0.14.0"
    }
  }
}
```

### LSB Release Detection

The lsb_release command line tool is now preferred to the contents of
`/etc/lsb-release` for release detection. This resolves an issue where a
distro can be upgraded, but `/etc/lsb-release` is not upgraded to
reflect the change.