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99 lines
4.9 KiB
Markdown
99 lines
4.9 KiB
Markdown
---
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layout: doc
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title: Disposable VM Customization
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permalink: /doc/dispvm-customization/
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redirect_from:
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- /en/doc/dispvm-customization/
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- /doc/DispVMCustomization/
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- /doc/UserDoc/DispVMCustomization/
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- /wiki/UserDoc/DispVMCustomization/
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---
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Disposable VM Customization
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====================
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Changing the DVM Template
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-------------------------
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You may want to use a non-default template the [DVM Template](/doc/glossary/#dvm-template). One example is to use a less-trusted template with some less trusted, 3rd party, often unsigned, applications installed, such as e.g. 3rd part printer drivers.
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In order to regenerate the Disposable VM "snapshot" (called 'savefile' on Qubes) one can use the following command in Dom0:
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[user@dom0 ~]$ qvm-create-default-dvm <custom-template-name>
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This would create a new Disposable VM savefile based on the custom template. Now, whenever one opens a file (from any AppVM) in a Disposable VM, a Disposable VM based on this template will be used.
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One can easily verify if the new Disposable VM template is indeed based on a custom template (in the example below the template called "f17-yellow" was used as a basis for the Disposable VM):
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[user@dom0 ~]$ ll /var/lib/qubes/dvmdata/
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total 0
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lrwxrwxrwx 1 user user 45 Mar 11 13:59 default_dvm.conf -> /var/lib/qubes/appvms/f17-yellow-dvm/dvm.conf
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lrwxrwxrwx 1 user user 49 Mar 11 13:59 default_savefile -> /var/lib/qubes/appvms/f17-yellow-dvm/dvm-savefile
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lrwxrwxrwx 1 user user 47 Mar 11 13:59 savefile_root -> /var/lib/qubes/vm-templates/f17-yellow/root.img
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If you wish to use the `fedora-minimal` template as a DVM Template, see the "DVM Template" use case under [fedora-minimal customization](/doc/templates/fedora-minimal/#customization).
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Customization of Disposable VM
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------------------------------
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It is possible to change the settings of each new Disposable VM (DispVM). This can be done by customizing the DispVM template:
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1. Start a terminal in the `fedora-23-dvm` TemplateVM by running the following command in a dom0 terminal. (By default, this TemplateVM is not shown in Qubes VM Manager. However, it can be shown by selecting "Show/Hide internal VMs.")
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[user@dom0 ~]$ qvm-run -a fedora-23-dvm gnome-terminal
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2. Change the VM's settings and/or applications, as desired. Note that currently Qubes supports exactly one DispVM template, so any changes you make here will affect all DispVMs. Some examples of changes you may want to make include:
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- Changing Firefox's default startup settings and homepage.
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- Changing Nautilus' default file preview settings.
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- Changing the DispVM's default NetVM. For example, you may wish to set the NetVM to "none." Then, whenever you start a new DispVM, you can choose your desired ProxyVM manually (by changing the newly-started DipsVMs settings). This is useful if you sometimes wish to use a DispVM with a TorVM, for example. It is also useful if you sometimes wish to open untrusted files in a network-disconnected DispVM.
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3. Create an empty `/home/user/.qubes-dispvm-customized` file in the VM (not in dom0):
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[user@fedora-23-dvm ~]$ touch /home/user/.qubes-dispvm-customized
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4. Shutdown the VM (either by `poweroff` from VM terminal, or `qvm-shutdown` from dom0 terminal).
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5. Regenerate the DispVM template using the default template:
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[user@dom0 ~]$ qvm-create-default-dvm --default-template
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Or, if you're [using a non-default template](#changing-the-dvm-template), regenerate the DispVM using your custom template:
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[user@dom0 ~]$ qvm-create-default-dvm <custom-template-name>
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**Note:** All of the above requires at least qubes-core-vm \>= 2.1.2 installed in template.
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Adding arbitrary programs to Disposable VM Application Menu
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-----------------------------------------------------------
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For added convenience, arbitrary programs can be added to the Application Menu of the Disposable VM. In order to do that `arbitrary.desktop` file has to be created in `/usr/share/applications` in Dom0. That file will point to the desired program. Use following template when creating a .desktop file:
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[Desktop Entry]
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Version=1.0
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Type=Application
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Exec=sh -c 'echo arbitrary | /usr/lib/qubes/qfile-daemon-dvm qubes.VMShell dom0 DEFAULT red
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Icon=dispvm-red
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Terminal=false
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Name=DispVM: Arbitrary Name
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GenericName=DispVM: Arbitrary Generic Name
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StartupNotify=false
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Categories=Network;X-Qubes-VM;
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Next, the /etc/xdg/menus/applications-merged/qubes-dispvm.menu file has to be modified so that it points to our newly-created .desktop file.
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Add `<Filename>arbitrary.desktop</Filename>` line to the `<Include></Include>` block. The modified file should look like this:
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<Include>
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<Filename>qubes-dispvm-firefox.desktop</Filename>
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<Filename>qubes-dispvm-xterm.desktop</Filename>
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<Filename>arbitrary.desktop</Filename>
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</Include>
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After saving the changes our program should appear under the Disposable VM Applications menu.
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