Rewrite in go, use libvirt
This commit is contained in:
parent
fbf4fa0e5a
commit
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9
.gitignore
vendored
9
.gitignore
vendored
@ -1,9 +0,0 @@
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bin/*
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!bin/.keep
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qemu/qcow2/*
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!qemu/qcow2/.keep
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qemu/bin/*
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!qemu/bin/.keep
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share/*
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!share/.keep
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nix/local.nix
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30
README.md
30
README.md
@ -4,9 +4,7 @@ Simple application VM's based on Nix package manager.
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Uses one **read-only** /nix directory for all appvms. So creating a new appvm (but not first) is just about one minute.
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Designed primarily for full screen usage (but remote-viewer has ability to resize window dynamically without change resolution) without guest additions (because of **less attack surface**).
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It's a proof-of-concept, but you can still use it. Also there is a lot of strange things inside, don't afraid of :)
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Currently optimized for full screen usage (but remote-viewer has ability to resize window dynamically without change resolution) without guest additions.
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@ -19,41 +17,41 @@ It's a proof-of-concept, but you can still use it. Also there is a lot of strang
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$ su -c 'USE="spice virtfs" emerge qemu virt-manager'
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## Add appvm to PATH
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## Libvirt from user (required if you need access to shared files)
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$ echo 'PATH=$PATH:$HOME/appvm/bin' >> ~/.bashrc
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$ echo user = "$USER" | sudo tee -a /etc/libvirt/qemu.conf
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(if you clone appvm to home directory)
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## Install appvm tool
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$ go get github.com/jollheef/appvm
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## Generate resolution
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By default uses 3840x2160. If you need to regenerate `appvm/nix/monitor.nix`:
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$ appvm/appvm.sh generate-resolution 1920 1080 > appvm/nix/monitor.nix
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$ $GOPATH/github.com/jollheef/appvm/generate-resolution.sh 1920 1080 > $GOPATH/github.com/jollheef/appvm/nix/monitor.nix
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Autodetection is a bash-spaghetti, so you need to check results. BTW it's just a X.org monitor section.
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## Create VM
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$ $HOME/appvm/appvm.sh build chromium
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You can customize local settings in `nix/local.nix`.
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## Run application
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$ appvm.chromium
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($GOPATH/bin must be in $PATH)
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$ appvm start chromium
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You can customize local settings in `$GOPATH/github.com/jollheef/appvm/nix/local.nix`.
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Default hotkey to release cursor: ctrl+alt.
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## Shared directory
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$ ls appvm/share/chromium
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$ ls appvm/chromium
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foo.tar.gz
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bar.tar.gz
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## Close VM
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$ pkill.... :)
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$ appvm stop chromium
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# App description
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212
appvm.go
Normal file
212
appvm.go
Normal file
@ -0,0 +1,212 @@
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/**
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* @author Mikhail Klementev jollheef<AT>riseup.net
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* @license GNU GPLv3
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* @date July 2018
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* @brief appvm launcher
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*/
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package main
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import (
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"fmt"
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"log"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"syscall"
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"time"
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"github.com/digitalocean/go-libvirt"
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"github.com/jollheef/go-system"
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kingpin "gopkg.in/alecthomas/kingpin.v2"
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)
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var xmlTmpl = `
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<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
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<name>%s</name>
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<memory unit='KiB'>1048576</memory>
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<currentMemory unit='KiB'>1048576</currentMemory>
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<vcpu placement='static'>1</vcpu>
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<os>
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<type arch='x86_64' machine='pc-i440fx-2.12'>hvm</type>
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<kernel>%s/kernel</kernel>
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<initrd>%s/initrd</initrd>
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<cmdline>loglevel=4 init=%s/init %s</cmdline>
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</os>
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<features>
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<acpi/>
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</features>
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<clock offset='utc'/>
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<on_poweroff>destroy</on_poweroff>
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<on_reboot>restart</on_reboot>
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<on_crash>destroy</on_crash>
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<devices>
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<!-- Graphical console -->
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<graphics type='spice' autoport='yes'>
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<listen type='address'/>
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<image compression='off'/>
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</graphics>
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<!-- Fake (because -snapshot) writeback image -->
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<disk type='file' device='disk'>
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<driver name='qemu' type='qcow2' cache='writeback' error_policy='report'/>
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<source file='%s'/>
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<target dev='vda' bus='virtio'/>
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</disk>
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<video>
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<model type='qxl' ram='524288' vram='524288' vgamem='262144' heads='1' primary='yes'/>
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<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
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</video>
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<!-- filesystems -->
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<filesystem type='mount' accessmode='passthrough'>
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<source dir='/nix/store'/>
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<target dir='store'/>
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<readonly/>
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</filesystem>
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<filesystem type='mount' accessmode='mapped'>
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<source dir='%s'/>
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<target dir='xchg'/> <!-- workaround for nixpkgs/nixos/modules/virtualisation/qemu-vm.nix -->
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</filesystem>
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<filesystem type='mount' accessmode='mapped'>
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<source dir='%s'/>
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<target dir='shared'/> <!-- workaround for nixpkgs/nixos/modules/virtualisation/qemu-vm.nix -->
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</filesystem>
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<filesystem type='mount' accessmode='mapped'>
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<source dir='%s'/>
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<target dir='home'/>
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</filesystem>
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</devices>
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<qemu:commandline>
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<qemu:arg value='-device'/>
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<qemu:arg value='e1000,netdev=net0'/>
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<qemu:arg value='-netdev'/>
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<qemu:arg value='user,id=net0'/>
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<qemu:arg value='-snapshot'/>
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</qemu:commandline>
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</domain>
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`
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func generateXML(name, vmNixPath, reginfo, img, sharedDir string) string {
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// TODO: Define XML in go
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return fmt.Sprintf(xmlTmpl, "appvm_"+name, vmNixPath, vmNixPath, vmNixPath,
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reginfo, img, sharedDir, sharedDir, sharedDir)
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}
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func list(l *libvirt.Libvirt) {
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domains, err := l.Domains()
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if err != nil {
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log.Fatal(err)
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}
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// TODO list available to create VM's too
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for _, d := range domains {
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if d.Name[0:5] == "appvm" {
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fmt.Println(d.Name[6:])
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}
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}
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}
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func start(l *libvirt.Libvirt, name string) {
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// Currently binary-only installation is not supported, because we need *.nix configurations
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gopath := os.Getenv("GOPATH")
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err := os.Chdir(gopath + "/src/github.com/jollheef/appvm")
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if err != nil {
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log.Fatal(err)
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}
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_, _, _, err = system.System("nix-build", "<nixpkgs/nixos>", "-A", "config.system.build.vm",
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"-I", "nixos-config=nix/"+name+".nix", "-I", ".")
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if err != nil {
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log.Fatal(err)
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}
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realpath, err := filepath.EvalSymlinks("result/system")
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if err != nil {
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log.Fatal(err)
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}
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// TODO: Use go regex
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reginfo, _, _, err := system.System("sh", "-c", "cat result/bin/run-nixos-vm | grep -o 'regInfo=.*/registration'")
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if err != nil {
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log.Fatal(err)
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}
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syscall.Unlink("result")
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qcow2 := "/tmp/.appvm.fake.qcow2"
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if _, err := os.Stat(qcow2); os.IsNotExist(err) {
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system.System("qemu-img", "create", "-f", "qcow2", qcow2, "512M")
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err := os.Chmod(qcow2, 0400) // qemu run with -snapshot, we only need it for create /dev/vda
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if err != nil {
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log.Fatal(err)
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}
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}
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sharedDir := fmt.Sprintf(os.Getenv("HOME") + "/appvm/" + name)
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os.MkdirAll(sharedDir, 0700)
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// TODO: Search go libraries for manipulate ACL
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_, _, _, err = system.System("setfacl", "-R", "-m", "u:qemu:rwx", os.Getenv("HOME")+"/appvm/")
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if err != nil {
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log.Fatal(err)
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}
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xml := generateXML(name, realpath, reginfo, qcow2, sharedDir)
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_, err = l.DomainCreateXML(xml, libvirt.DomainStartValidate)
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if err != nil {
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log.Fatal(err)
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}
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cmd := exec.Command("virt-viewer", "-f", "appvm_"+name)
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cmd.Start()
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}
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func stop(l *libvirt.Libvirt, name string) {
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dom, err := l.DomainLookupByName("appvm_" + name)
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if err != nil {
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if libvirt.IsNotFound(err) {
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log.Println("Appvm not found or already stopped")
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return
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} else {
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log.Fatal(err)
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}
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}
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err = l.DomainDestroy(dom)
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if err != nil {
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log.Fatal(err)
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}
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}
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func drop(name string) {
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appDataPath := fmt.Sprintf(os.Getenv("HOME") + "/appvm/" + name)
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os.RemoveAll(appDataPath)
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}
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func main() {
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c, err := net.DialTimeout("unix", "/var/run/libvirt/libvirt-sock", time.Second)
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if err != nil {
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log.Fatal(err)
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}
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l := libvirt.New(c)
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if err := l.Connect(); err != nil {
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log.Fatal(err)
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}
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defer l.Disconnect()
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kingpin.Command("list", "List applications")
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startName := kingpin.Command("start", "Start application").Arg("name", "Application name").Required().String()
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stopName := kingpin.Command("stop", "Stop application").Arg("name", "Application name").Required().String()
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dropName := kingpin.Command("drop", "Remove application data").Arg("name", "Application name").Required().String()
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switch kingpin.Parse() {
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case "list":
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list(l)
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case "start":
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start(l, *startName)
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case "stop":
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stop(l, *stopName)
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case "drop":
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drop(*dropName)
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}
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}
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49
appvm.sh
49
appvm.sh
@ -1,49 +0,0 @@
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#!/bin/bash
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APPVM_PATH=$(dirname $(realpath $0))
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cd ${APPVM_PATH}
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if [ ! -f nix/local.nix ]; then
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echo "[*] There is no local.nix, creating."
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echo -e "{\n}" >> nix/local.nix
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fi
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if [[ "$1" == "build" && "$2" != "" ]]; then
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if [ -f bin/appvm.${2} ]; then
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echo "[*] Kill app."
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pkill -f "$(cat bin/appvm.${2} | grep pgrep | awk '{ print $3 }')"
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fi
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if [ -f qemu/qcow2/${2}.qcow2 ]; then
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echo "[*] Remove old app state."
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rm qemu/qcow2/${2}.qcow2
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fi
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NIX_PATH=$NIX_PATH:. nix-build '<nixpkgs/nixos>' -A config.system.build.vm -I nixos-config=nix/${2}.nix || exit 1
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NIX_SYSTEM=$(realpath result/system)
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mkdir -p bin
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RAND_HASH=$(head /dev/urandom | md5sum | awk '{ print $1 }')
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VM_BIN_PATH=$(realpath qemu/bin/qemu.${RAND_HASH}.${2})
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sed "s;NIX_SYSTEM_PLACEHOLDER;${NIX_SYSTEM};" qemu/qemu.template > ${VM_BIN_PATH}
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sed -i "s;NAME_PLACEHOLDER;${2};" ${VM_BIN_PATH}
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sed -i "s;HASH_PLACEHOLDER;${RAND_HASH};" ${VM_BIN_PATH}
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sed -i "s;NIX_DISK_IMAGE_PLACEHOLDER;${APPVM_PATH}/qemu/qcow2/${2}.qcow2;" ${VM_BIN_PATH}
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RANDOM_PORT=$(/usr/bin/python -c 'import random; print(random.randint(1024,65535))')
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# TODO Check for port collisions
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sed -i "s;PORT_PLACEHOLDER;${RANDOM_PORT};" ${VM_BIN_PATH}
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echo -e "#!/bin/bash\npgrep -f ${RAND_HASH} || {\n\tnohup setsid ${VM_BIN_PATH} >/dev/null 2>&1 &\n\tsleep 1s\n}\nremote-viewer -f spice://127.200.0.1:${RANDOM_PORT}" > bin/appvm.${2}
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chmod +x ${VM_BIN_PATH}
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chmod +x bin/appvm.${2}
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unlink result
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elif [[ "$1" == "generate-resolution" && "$2" != "" && "$3" != "" ]]; then
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MONITOR_SIZE="$(xrandr | grep mm | head -n 1 | awk '{ print $(NF-2) " " $(NF) }' | sed 's/mm//g')"
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CVT="$(cvt ${2} ${3} | grep Modeline)"
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echo "{"
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echo " services.xserver.monitorSection = ''"
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echo " " ${CVT}
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echo " " Option '"PreferredMode"' $(echo ${CVT} | awk '{ print $2 }')
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echo " " DisplaySize ${MONITOR_SIZE} # In millimeters
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echo " '';"
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echo "}"
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else
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echo -e "Usage:\t$0 build APPLICATION"
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echo -e "or:\t$0 generate-resolution X Y"
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fi
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16
generate-resolution.sh
Executable file
16
generate-resolution.sh
Executable file
@ -0,0 +1,16 @@
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#!/bin/sh
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if [[ "$1" == "" || "$2" == "" ]]; then
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echo -e "Usage:\t$0 X Y"
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exit 1
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fi
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MONITOR_SIZE="$(xrandr | grep mm | head -n 1 | awk '{ print $(NF-2) " " $(NF) }' | sed 's/mm//g')"
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CVT="$(cvt ${1} ${2} | grep Modeline)"
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echo "{"
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echo " services.xserver.monitorSection = ''"
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echo " " ${CVT}
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echo " " Option '"PreferredMode"' $(echo ${CVT} | awk '{ print $2 }')
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echo " " DisplaySize ${MONITOR_SIZE} # In millimeters
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echo " '';"
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echo "}"
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13
nix/base.nix
13
nix/base.nix
@ -36,11 +36,22 @@ main = xmonad defaultConfig
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description = "Create and xmonad configuration";
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serviceConfig = {
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ConditionFileNotEmpty = "!/home/user/.xmonad/xmonad.hs";
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ExecStart = "/bin/sh -c 'mkdir /home/user/.xmonad && cp /etc/xmonad.hs /home/user/.xmonad/xmonad.hs'";
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ExecStart = "/bin/sh -c 'mkdir -p /home/user/.xmonad && cp /etc/xmonad.hs /home/user/.xmonad/xmonad.hs'";
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RemainAfterExit = "yes";
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Type = "oneshot";
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User = "user";
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};
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wantedBy = [ "multi-user.target" ];
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};
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systemd.services.mount-home-user = {
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description = "Mount /home/user (crutch)";
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serviceConfig = {
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ExecStart = "/bin/sh -c '/run/current-system/sw/bin/mount -t 9p -o trans=virtio,version=9p2000.L,uid=1000 home /home/user'";
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RemainAfterExit = "yes";
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Type = "oneshot";
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User = "root";
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};
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wantedBy = [ "sysinit.target" ];
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};
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}
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4
nix/local.nix
Normal file
4
nix/local.nix
Normal file
@ -0,0 +1,4 @@
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{
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services.xserver.layout = "us,ru";
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services.xserver.xkbOptions = "ctrl:nocaps,grp:rctrl_toggle";
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}
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@ -1,36 +0,0 @@
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#!/bin/bash
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NAME=NAME_PLACEHOLDER
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NIX_DISK_IMAGE=NIX_DISK_IMAGE_PLACEHOLDER
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if ! test -e "$NIX_DISK_IMAGE"; then
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qemu-img create -f qcow2 "$NIX_DISK_IMAGE" 512M || exit 1
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fi
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# Create a directory for storing temporary data of the running VM.
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TMPDIR=$(dirname ${NIX_DISK_IMAGE})/../../share/NAME_PLACEHOLDER
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# Create a directory for exchanging data with the VM.
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mkdir -p $TMPDIR
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cd $TMPDIR
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NIX_SYSTEM="NIX_SYSTEM_PLACEHOLDER"
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# Start QEMU.
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qemu-system-x86_64 -enable-kvm \
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-name NAME_PLACEHOLDER_HASH_PLACEHOLDER \
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-m 1024 \
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-smp 1 \
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-device virtio-rng-pci \
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-net nic,netdev=user.0,model=virtio -netdev user,id=user.0${QEMU_NET_OPTS:+,$QEMU_NET_OPTS} \
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-spice port=PORT_PLACEHOLDER,addr=127.200.0.1,disable-ticketing,image-compression=off,seamless-migration=on \
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-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
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-virtfs local,path=/nix/store,security_model=none,mount_tag=store,readonly \
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-virtfs local,path=$TMPDIR,security_model=none,mount_tag=xchg \
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-virtfs local,path=${SHARED_DIR:-$TMPDIR},security_model=none,mount_tag=shared \
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-drive index=0,id=drive$((0 + 1)),file=$NIX_DISK_IMAGE,cache=writeback,werror=report,if=virtio \
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-kernel ${NIX_SYSTEM}/kernel \
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-initrd ${NIX_SYSTEM}/initrd \
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||||
-append "$(cat ${NIX_SYSTEM}/kernel-params) init=${NIX_SYSTEM}/init regInfo=/nix/store/622pn30mg7z4knkrqsh3acrjyaiyq6sr-closure-info/registration" \
|
||||
-device qxl-vga,vgamem_mb=256 #-display gtk
|
||||
Loading…
Reference in New Issue
Block a user