Supporting hard drive size configuration

[Francisco Ryan Tolmasky I]

We've been able to get hard drive size configuration working with the following:

class VagrantPlugins::Parallels::Config
    
    # Extend the Vagrant::Parallels::Config class to have the missing size
    # setter. We use prlctl's set --size, and we have to use --no-fs-resize
    # because prlctl doesn't support ext4. Not to worry though, we'll handle
    # that in the shell script below...
    def size=(size)
        customize('pre-boot',
            ['set', :id, '--size', size.to_s + 'M', '--no-fs-resize'])

        customize('post-comm',
        [
            'exec', :id,
            <<-SHELL
                printf "resizepart\n3\nYes\n100%%\nquit" | \
                    sudo parted /dev/sda ---pretend-input-tty && \
                resize2fs /dev/sda3
            SHELL
        ])

    end
end

However, this also requires us to first modify the Parallels box available on vagrant cloud:

$ tar xf parallels-ubuntu-box.box -C ./tmp
$ prlctl --merge `$(find ./tmp -name *pvm)/harddisk1.hdd`
$ tar cvzf parallels-ubuntu-box-resizable.box -C ./tmp ./tmp/*

After this, you can finally treat size just like memory, and you can resize it freely across reboots as well:

  config.vm.provider "parallels" do |box, override|
    box.size = 100000
  end

We've wrapped up that unfortunate prlctl merge stuff in a function that lets you call it directly from Vagrant and caches it:

config.vm.box = resizable_box "generic/ubuntu2004@3.6.14"

Anyways, is this something worth putting into the main parallels plugin? It was certainly hard to put all this information together, but I don't know enough about all this to know if this will work for everything or just happens to work on our installation. We've only tried it with ubuntu 18.04 and 20.04.

[Saeed Zarinfam]

This is an essential feature, and I wonder why the parallels vagrant plugin does not support this.