renamed to mnmivm, more detailed list view
This commit is contained in:
parent
1e7135b2d2
commit
010d78a1cc
3 changed files with 260 additions and 253 deletions
2
build.sh
2
build.sh
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@ -1,2 +1,2 @@
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#!/bin/sh
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go build -o ./microvm
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go build -o ./mnmivm
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511
main.go
511
main.go
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@ -1,75 +1,75 @@
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package main
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import (
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"fmt"
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"io"
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"net/http"
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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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"strings"
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"fmt"
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"io"
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"net"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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)
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const (
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rootDir = "/var/lib/microvm"
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imageDir = rootDir + "/images"
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vmDirBase = rootDir + "/vms"
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rootDir = "/var/lib/microvm"
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imageDir = rootDir + "/images"
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vmDirBase = rootDir + "/vms"
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memMB = "1024"
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cpus = "1"
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memMB = "1024"
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cpus = "1"
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)
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type OSImage struct {
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Name string
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URL string
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Filename string
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User string
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Name string
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URL string
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Filename string
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User string
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}
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var osImages = map[string]OSImage{
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"ubuntu": {
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Name: "ubuntu",
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URL: "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img",
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Filename: "ubuntu-24.04.qcow2",
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User: "ubuntu",
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},
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"debian": {
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Name: "debian",
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URL: "https://cloud.debian.org/images/cloud/trixie/20251117-2299/debian-13-generic-amd64-20251117-2299.qcow2",
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Filename: "debian-13.qcow2",
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User: "debian",
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},
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"fedora": {
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Name: "fedora",
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URL: "https://download.fedoraproject.org/pub/fedora/linux/releases/43/Cloud/x86_64/images/Fedora-Cloud-Base-Generic-43-1.6.x86_64.qcow2",
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Filename: "fedora-43.qcow2",
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User: "fedora",
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},
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"alpine": {
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Name: "alpine",
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URL: "https://dl-cdn.alpinelinux.org/alpine/v3.22/releases/cloud/generic_alpine-3.22.2-x86_64-bios-cloudinit-r0.qcow2",
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Filename: "alpine-3.22.qcow2",
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User: "alpine",
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},
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"ubuntu": {
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Name: "ubuntu",
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URL: "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img",
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Filename: "ubuntu-24.04.qcow2",
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User: "ubuntu",
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},
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"debian": {
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Name: "debian",
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URL: "https://cloud.debian.org/images/cloud/trixie/20251117-2299/debian-13-generic-amd64-20251117-2299.qcow2",
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Filename: "debian-13.qcow2",
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User: "debian",
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},
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"fedora": {
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Name: "fedora",
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URL: "https://download.fedoraproject.org/pub/fedora/linux/releases/43/Cloud/x86_64/images/Fedora-Cloud-Base-Generic-43-1.6.x86_64.qcow2",
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Filename: "fedora-43.qcow2",
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User: "fedora",
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},
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"alpine": {
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Name: "alpine",
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URL: "https://dl-cdn.alpinelinux.org/alpine/v3.22/releases/cloud/generic_alpine-3.22.2-x86_64-bios-cloudinit-r0.qcow2",
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Filename: "alpine-3.22.qcow2",
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User: "alpine",
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},
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}
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func ensureDirs() {
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for _, d := range []string{imageDir, vmDirBase} {
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if err := os.MkdirAll(d, 0755); err != nil {
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panic(err)
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}
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}
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for _, d := range []string{imageDir, vmDirBase} {
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if err := os.MkdirAll(d, 0755); err != nil {
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panic(err)
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}
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}
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}
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func usage() {
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fmt.Println("usage:")
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fmt.Println(" microvm create <name> --os <ubuntu|debian|fedora|alpine> --pubkey-path <path>")
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fmt.Println(" microvm start <name>")
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fmt.Println(" microvm stop <name>")
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fmt.Println(" microvm delete <name>")
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fmt.Println(" microvm list")
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os.Exit(1)
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fmt.Println("usage:")
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fmt.Println(" mnmivm create <name> --os <ubuntu|debian|fedora|alpine> --pubkey-path <path>")
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fmt.Println(" mnmivm start <name>")
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fmt.Println(" mnmivm stop <name>")
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fmt.Println(" mnmivm delete <name>")
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fmt.Println(" mnmivm list")
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os.Exit(1)
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}
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func vmDir(name string) string { return filepath.Join(vmDirBase, name) }
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@ -79,48 +79,18 @@ func seedISOPath(name string) string { return filepath.Join(vmDir(name), "seed.
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func vmPubKeyPath(name string) string { return filepath.Join(vmDir(name), "pubkey.pub") }
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func imagePath(osName string) string {
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return filepath.Join(imageDir, osImages[osName].Filename)
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return filepath.Join(imageDir, osImages[osName].Filename)
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}
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func deleteVM(name string) {
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dir := vmDir(name)
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if _, err := os.Stat(dir); err != nil {
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panic("VM does not exist: " + name)
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}
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// If running, stop it first
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if data, err := os.ReadFile(pidFile(name)); err == nil {
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pid := strings.TrimSpace(string(data))
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if _, err := os.Stat("/proc/" + pid); err == nil {
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fmt.Println("VM is running, stopping it first...")
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exec.Command("kill", pid).Run()
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func parseArg(args []string, key string) string {
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for i := 0; i < len(args)-1; i++ {
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if args[i] == key {
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return args[i+1]
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}
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os.Remove(pidFile(name))
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}
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fmt.Printf(`
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WARNING: This will permanently delete the VM "%s"
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Path: %s
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Type YES (all caps) to confirm: `, name, dir)
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var confirm string
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fmt.Scanln(&confirm)
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if confirm != "YES" {
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fmt.Println("Aborted. VM not deleted.")
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return
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}
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if err := os.RemoveAll(dir); err != nil {
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panic(err)
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}
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fmt.Println("VM deleted:", name)
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panic("missing required argument: " + key)
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}
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func findFreePort() int {
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l, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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@ -130,219 +100,256 @@ func findFreePort() int {
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return l.Addr().(*net.TCPAddr).Port
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}
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func ensureBaseImage(osName string) {
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img := osImages[osName]
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path := imagePath(osName)
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func parseArg(args []string, key string) string {
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for i := 0; i < len(args)-1; i++ {
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if args[i] == key {
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return args[i+1]
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}
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}
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panic("missing required argument: " + key)
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if _, err := os.Stat(path); err == nil {
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return
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}
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fmt.Println("Downloading", img.Name, "cloud image...")
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resp, err := http.Get(img.URL)
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if err != nil {
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panic(err)
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}
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defer resp.Body.Close()
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out, err := os.Create(path)
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if err != nil {
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panic(err)
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}
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defer out.Close()
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if _, err := io.Copy(out, resp.Body); err != nil {
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panic(err)
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}
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}
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func readPublicKey(path string) string {
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data, err := os.ReadFile(path)
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if err != nil {
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panic(err)
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}
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key := strings.TrimSpace(string(data))
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if !strings.HasPrefix(key, "ssh-") {
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panic("invalid SSH public key")
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}
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return key
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}
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func ensureBaseImage(osName string) {
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img := osImages[osName]
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path := imagePath(osName)
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if _, err := os.Stat(path); err == nil {
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return
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}
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fmt.Println("Downloading", img.Name, "cloud image...")
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resp, err := http.Get(img.URL)
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if err != nil {
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panic(err)
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}
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defer resp.Body.Close()
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out, err := os.Create(path)
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if err != nil {
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panic(err)
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}
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defer out.Close()
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if _, err := io.Copy(out, resp.Body); err != nil {
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panic(err)
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}
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data, err := os.ReadFile(path)
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if err != nil {
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panic(err)
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}
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key := strings.TrimSpace(string(data))
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if !strings.HasPrefix(key, "ssh-") {
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panic("invalid SSH public key")
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}
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return key
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}
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func createCloudInitSeed(name, osName, pubKeyPath string) {
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img := osImages[osName]
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sshKey := readPublicKey(pubKeyPath)
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img := osImages[osName]
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sshKey := readPublicKey(pubKeyPath)
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userData := fmt.Sprintf(`#cloud-config
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userData := fmt.Sprintf(`#cloud-config
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users:
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- name: %s
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sudo: ALL=(ALL) NOPASSWD:ALL
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shell: /bin/sh
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ssh_authorized_keys:
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- %s
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ssh_pwauth: false
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disable_root: true
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`, img.User, sshKey)
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metaData := fmt.Sprintf(`instance-id: %s
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local-hostname: %s
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`, name, name)
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metaData := fmt.Sprintf("instance-id: %s\nlocal-hostname: %s\n", name, name)
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tmpDir, _ := os.MkdirTemp("", "cloudinit")
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defer os.RemoveAll(tmpDir)
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tmpDir, _ := os.MkdirTemp("", "cloudinit")
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defer os.RemoveAll(tmpDir)
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os.WriteFile(filepath.Join(tmpDir, "user-data"), []byte(userData), 0644)
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os.WriteFile(filepath.Join(tmpDir, "meta-data"), []byte(metaData), 0644)
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os.WriteFile(filepath.Join(tmpDir, "user-data"), []byte(userData), 0644)
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os.WriteFile(filepath.Join(tmpDir, "meta-data"), []byte(metaData), 0644)
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cmd := exec.Command(
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"genisoimage",
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"-output", seedISOPath(name),
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"-volid", "cidata",
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"-joliet",
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"-rock",
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filepath.Join(tmpDir, "user-data"),
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filepath.Join(tmpDir, "meta-data"),
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)
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cmd := exec.Command(
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"genisoimage",
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"-output", seedISOPath(name),
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"-volid", "cidata",
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"-joliet",
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"-rock",
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filepath.Join(tmpDir, "user-data"),
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filepath.Join(tmpDir, "meta-data"),
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)
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if out, err := cmd.CombinedOutput(); err != nil {
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panic(string(out))
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}
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if out, err := cmd.CombinedOutput(); err != nil {
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panic(string(out))
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}
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}
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func createVM(name, osName, pubKeyPath string) {
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if _, ok := osImages[osName]; !ok {
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panic("unsupported OS: " + osName)
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}
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if _, ok := osImages[osName]; !ok {
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panic("unsupported OS: " + osName)
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}
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ensureBaseImage(osName)
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os.MkdirAll(vmDir(name), 0755)
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ensureBaseImage(osName)
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os.MkdirAll(vmDir(name), 0755)
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keyDst := vmPubKeyPath(name)
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data, _ := os.ReadFile(pubKeyPath)
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os.WriteFile(keyDst, data, 0644)
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keyData, _ := os.ReadFile(pubKeyPath)
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os.WriteFile(vmPubKeyPath(name), keyData, 0644)
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os.WriteFile(filepath.Join(vmDir(name), "os.name"), []byte(osName), 0644)
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cmd := exec.Command(
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"qemu-img", "create",
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"-f", "qcow2",
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"-F", "qcow2",
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"-b", imagePath(osName),
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diskPath(name),
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)
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cmd := exec.Command(
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"qemu-img", "create",
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"-f", "qcow2",
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"-F", "qcow2",
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"-b", imagePath(osName),
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diskPath(name),
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)
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if out, err := cmd.CombinedOutput(); err != nil {
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panic(string(out))
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}
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if out, err := cmd.CombinedOutput(); err != nil {
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panic(string(out))
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}
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createCloudInitSeed(name, osName, keyDst)
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fmt.Println("VM created:", name, "OS:", osName)
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createCloudInitSeed(name, osName, vmPubKeyPath(name))
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fmt.Println("VM created:", name, "OS:", osName)
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}
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func startVM(name string) {
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if data, err := os.ReadFile(pidFile(name)); err == nil {
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if _, err := os.Stat("/proc/" + strings.TrimSpace(string(data))); err == nil {
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panic("VM already running")
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}
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os.Remove(pidFile(name))
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}
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if data, err := os.ReadFile(pidFile(name)); err == nil {
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if _, err := os.Stat("/proc/" + strings.TrimSpace(string(data))); err == nil {
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panic("VM already running")
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}
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os.Remove(pidFile(name))
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}
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port := findFreePort()
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vncPort := findFreePort()
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vncDisplay := vncPort - 5900
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if vncDisplay < 0 {
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panic("invalid VNC port allocation")
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}
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sshPort := findFreePort()
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vncPort := findFreePort()
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vncDisplay := vncPort - 5900
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if vncDisplay < 0 {
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panic("invalid VNC port")
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}
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cmd := exec.Command(
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"qemu-system-x86_64",
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"-enable-kvm",
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"-machine", "q35",
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"-cpu", "host",
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"-m", memMB,
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"-smp", cpus,
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"-vga", "virtio",
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"-display", fmt.Sprintf("vnc=0.0.0.0:%d", vncDisplay),
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"-drive", fmt.Sprintf("file=%s,if=virtio,format=qcow2", diskPath(name)),
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"-drive", fmt.Sprintf("file=%s,if=virtio,format=raw", seedISOPath(name)),
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"-netdev", fmt.Sprintf("user,id=net0,hostfwd=tcp::%d-:22", sshPort),
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"-device", "virtio-net-pci,netdev=net0",
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"-pidfile", pidFile(name),
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"-daemonize",
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)
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cmd := exec.Command(
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"qemu-system-x86_64",
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"-enable-kvm",
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"-machine", "q35",
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"-cpu", "host",
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"-m", memMB,
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"-smp", cpus,
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if out, err := cmd.CombinedOutput(); err != nil {
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panic(string(out))
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}
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"-vga", "virtio",
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"-display", fmt.Sprintf("vnc=0.0.0.0:%d", vncDisplay),
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os.WriteFile(filepath.Join(vmDir(name), "ssh.port"), []byte(fmt.Sprint(sshPort)), 0644)
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os.WriteFile(filepath.Join(vmDir(name), "vnc.port"), []byte(fmt.Sprint(vncPort)), 0644)
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"-drive", fmt.Sprintf("file=%s,if=virtio,format=qcow2", diskPath(name)),
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"-drive", fmt.Sprintf("file=%s,if=virtio,format=raw", seedISOPath(name)),
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"-netdev", fmt.Sprintf("user,id=net0,hostfwd=tcp::%d-:22", port),
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"-device", "virtio-net-pci,netdev=net0",
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"-boot", "order=c",
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"-pidfile", pidFile(name),
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"-daemonize",
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)
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if out, err := cmd.CombinedOutput(); err != nil {
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panic(string(out))
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}
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fmt.Println("VM started:", name)
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fmt.Printf("VNC: vnc://127.0.0.1:%d\n", vncPort)
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fmt.Printf("SSH: ssh <user>@localhost -p %d\n", port)
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fmt.Println("VM started:", name)
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fmt.Printf("SSH: ssh %s@localhost -p %d\n", osImages[readFileTrim(filepath.Join(vmDir(name), "os.name"))].User, sshPort)
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fmt.Printf("VNC: vnc://0.0.0.0:%d\n", vncPort)
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}
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func stopVM(name string) {
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data, _ := os.ReadFile(pidFile(name))
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exec.Command("kill", strings.TrimSpace(string(data))).Run()
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os.Remove(pidFile(name))
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fmt.Println("VM stopped:", name)
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||||
data, _ := os.ReadFile(pidFile(name))
|
||||
exec.Command("kill", strings.TrimSpace(string(data))).Run()
|
||||
os.Remove(pidFile(name))
|
||||
fmt.Println("VM stopped:", name)
|
||||
}
|
||||
|
||||
func deleteVM(name string) {
|
||||
dir := vmDir(name)
|
||||
if _, err := os.Stat(dir); err != nil {
|
||||
panic("VM does not exist")
|
||||
}
|
||||
|
||||
if data, err := os.ReadFile(pidFile(name)); err == nil {
|
||||
exec.Command("kill", strings.TrimSpace(string(data))).Run()
|
||||
os.Remove(pidFile(name))
|
||||
}
|
||||
|
||||
fmt.Printf("\nWARNING: Permanently delete VM \"%s\"?\nType YES to confirm: ", name)
|
||||
var confirm string
|
||||
fmt.Scanln(&confirm)
|
||||
if confirm != "YES" {
|
||||
fmt.Println("Aborted.")
|
||||
return
|
||||
}
|
||||
|
||||
os.RemoveAll(dir)
|
||||
fmt.Println("VM deleted:", name)
|
||||
}
|
||||
|
||||
func readFileTrim(path string) string {
|
||||
data, err := os.ReadFile(path)
|
||||
if err != nil {
|
||||
return "-"
|
||||
}
|
||||
return strings.TrimSpace(string(data))
|
||||
}
|
||||
|
||||
func vmRunning(name string) bool {
|
||||
data, err := os.ReadFile(pidFile(name))
|
||||
if err != nil {
|
||||
return false
|
||||
}
|
||||
_, err = os.Stat("/proc/" + strings.TrimSpace(string(data)))
|
||||
return err == nil
|
||||
}
|
||||
|
||||
func listVMs() {
|
||||
entries, _ := os.ReadDir(vmDirBase)
|
||||
for _, e := range entries {
|
||||
fmt.Println(e.Name())
|
||||
}
|
||||
entries, _ := os.ReadDir(vmDirBase)
|
||||
|
||||
fmt.Printf("%-12s %-8s %-8s %-16s %-16s %s\n",
|
||||
"NAME", "STATE", "OS", "SSH", "VNC", "PUBKEY")
|
||||
fmt.Println(strings.Repeat("-", 90))
|
||||
|
||||
for _, e := range entries {
|
||||
name := e.Name()
|
||||
dir := vmDir(name)
|
||||
|
||||
state := "stopped"
|
||||
if vmRunning(name) {
|
||||
state = "running"
|
||||
}
|
||||
|
||||
osName := readFileTrim(filepath.Join(dir, "os.name"))
|
||||
sshPort := readFileTrim(filepath.Join(dir, "ssh.port"))
|
||||
vncPort := readFileTrim(filepath.Join(dir, "vnc.port"))
|
||||
|
||||
ssh := "-"
|
||||
if sshPort != "-" {
|
||||
ssh = "localhost:" + sshPort
|
||||
}
|
||||
|
||||
vnc := "-"
|
||||
if vncPort != "-" {
|
||||
vnc = "0.0.0.0:" + vncPort
|
||||
}
|
||||
|
||||
fmt.Printf("%-12s %-8s %-8s %-16s %-16s %s\n",
|
||||
name, state, osName, ssh, vnc, vmPubKeyPath(name))
|
||||
}
|
||||
}
|
||||
|
||||
func main() {
|
||||
if len(os.Args) < 2 {
|
||||
usage()
|
||||
}
|
||||
|
||||
ensureDirs()
|
||||
|
||||
switch os.Args[1] {
|
||||
case "create":
|
||||
if len(os.Args) < 3 {
|
||||
usage()
|
||||
}
|
||||
osName := parseArg(os.Args, "--os")
|
||||
pubKey := parseArg(os.Args, "--pubkey-path")
|
||||
createVM(os.Args[2], osName, pubKey)
|
||||
|
||||
case "start":
|
||||
startVM(os.Args[2])
|
||||
|
||||
case "stop":
|
||||
stopVM(os.Args[2])
|
||||
|
||||
case "delete":
|
||||
if len(os.Args) < 3 {
|
||||
if len(os.Args) < 2 {
|
||||
usage()
|
||||
}
|
||||
deleteVM(os.Args[2])
|
||||
|
||||
case "list":
|
||||
listVMs()
|
||||
ensureDirs()
|
||||
|
||||
default:
|
||||
usage()
|
||||
}
|
||||
switch os.Args[1] {
|
||||
case "create":
|
||||
createVM(os.Args[2], parseArg(os.Args, "--os"), parseArg(os.Args, "--pubkey-path"))
|
||||
case "start":
|
||||
startVM(os.Args[2])
|
||||
case "stop":
|
||||
stopVM(os.Args[2])
|
||||
case "delete":
|
||||
deleteVM(os.Args[2])
|
||||
case "list":
|
||||
listVMs()
|
||||
default:
|
||||
usage()
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
BIN
microvm
BIN
microvm
Binary file not shown.
Loading…
Add table
Add a link
Reference in a new issue