appvm/README.md

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# Nix application VMs: security through virtualization
Simple application VMs (hypervisor-based sandbox) based on Nix package manager.
Uses one **read-only** /nix directory for all appvms. So creating a new appvm (but not first) is just about one minute.
Currently optimized for full screen usage (but remote-viewer has ability to resize window dynamically without change resolution).
![appvm screenshot](screenshots/2018-07-05.png)
## Dependencies
$ sudo apt install golang virt-manager curl git
$ sudo usermod -a -G libvirt $USER
$ echo 'export GOPATH=$HOME/go' >> ~/.bash_profile
$ echo 'export PATH=$PATH:$GOPATH/bin' >> ~/.bash_profile
$ echo 'source ~/.bash_profile' >> ~/.bashrc
$ source ~/.bash_profile
You need to **relogin** if you install virt-manager (libvirt) first time.
## Install Nix package manager
$ sudo mkdir -m 0755 /nix && sudo chown $USER /nix
$ curl https://nixos.org/nix/install | sh
$ . ~/.nix-profile/etc/profile.d/nix.sh
## Libvirt from user (required if you need access to shared files)
$ echo user = "\"$USER\"" | sudo tee -a /etc/libvirt/qemu.conf
$ sudo systemctl restart libvirtd
## Install appvm tool
$ go get code.dumpstack.io/tools/appvm
## Update appvm tool
$ go get -u code.dumpstack.io/tools/appvm
## Generate resolution
By default uses 1920x1080. If you need to regenerate `appvm/nix/monitor.nix`:
$ $GOPATH/src/code.dumpstack.io/tools/appvm/generate-resolution.sh 3840 2160 > $GOPATH/src/code.dumpstack.io/tools/appvm/nix/monitor.nix
Autodetection is a bash-spaghetti, so you need to check results. BTW it's just a X.org monitor section.
## Run application
$ appvm start chromium --verbose
$ # ... long wait for first time, because we need to collect a lot of packages
You can customize local settings in `$GOPATH/code.dumpstack.io/tools/appvm/nix/local.nix`.
Default hotkey to release cursor: ctrl+alt.
## Shared directory
$ ls appvm/chromium
foo.tar.gz
bar.tar.gz
## Close VM
$ appvm stop chromium
## Automatic ballooning
Add this command:
$ appvm autoballoon
to crontab like that:
$ crontab -l
* * * * * /home/user/dev/go/bin/appvm autoballoon
# App description
$ cat nix/chromium.nix
{pkgs, ...}:
{
imports = [
<nixpkgs/nixos/modules/virtualisation/qemu-vm.nix>
<nix/base.nix>
];
environment.systemPackages = [ pkgs.chromium ];
services.xserver.displayManager.sessionCommands = "while [ 1 ]; do ${pkgs.chromium}/bin/chromium; done &";
}
For create new app you should add package name (search at https://nixos.org/nixos/packages.html) and path to binary (typically same as package name).
## Defined applications (pull requests are welcome!)
* chromium
* thunderbird
* tdesktop
* evince
* libreoffice
* wire
* torbrowser