Merge pull request #9781 from baude/addqemu

introduce podman machine

1 files changed, 317 insertions, 0 deletions

diff --git a/pkg/machine/qemu/machine.go b/pkg/machine/qemu/machine.go
new file mode 100644
index 000000000..504b64bd5
--- /dev/null
+++ b/pkg/machine/qemu/machine.go
@@ -0,0 +1,317 @@
+package qemu
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"github.com/containers/podman/v3/utils"
+
+	"github.com/containers/podman/v3/pkg/machine"
+	"github.com/containers/storage/pkg/homedir"
+	"github.com/digitalocean/go-qemu/qmp"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	// vmtype refers to qemu (vs libvirt, krun, etc)
+	vmtype = "qemu"
+	// qemuCommon are the common command line arguments between the arches
+	//qemuCommon = []string{"-cpu", "host", "-qmp", "unix://tmp/qmp.sock,server,nowait"}
+	//qemuCommon  = []string{"-cpu", "host", "-qmp", "tcp:localhost:4444,server,nowait"}
+)
+
+// NewMachine creates an instance of a virtual machine based on the qemu
+// virtualization.
+func NewMachine(opts machine.CreateOptions) (machine.VM, error) {
+	vmConfigDir, err := machine.GetConfDir(vmtype)
+	if err != nil {
+		return nil, err
+	}
+	vm := new(MachineVM)
+	if len(opts.Name) > 0 {
+		vm.Name = opts.Name
+	}
+	vm.IgnitionFilePath = opts.IgnitionPath
+	// If no ignitionfilepath was provided, use defaults
+	if len(vm.IgnitionFilePath) < 1 {
+		ignitionFile := filepath.Join(vmConfigDir, vm.Name+".ign")
+		vm.IgnitionFilePath = ignitionFile
+	}
+
+	// An image was specified
+	if len(opts.ImagePath) > 0 {
+		vm.ImagePath = opts.ImagePath
+	}
+
+	// Assign remote user name. if not provided, use default
+	vm.RemoteUsername = opts.Username
+	if len(vm.RemoteUsername) < 1 {
+		vm.RemoteUsername = defaultRemoteUser
+	}
+
+	// Add a random port for ssh
+	port, err := utils.GetRandomPort()
+	if err != nil {
+		return nil, err
+	}
+	vm.Port = port
+
+	vm.CPUs = opts.CPUS
+	vm.Memory = opts.Memory
+
+	// Look up the executable
+	execPath, err := exec.LookPath(QemuCommand)
+	if err != nil {
+		return nil, err
+	}
+	cmd := append([]string{execPath})
+	// Add memory
+	cmd = append(cmd, []string{"-m", strconv.Itoa(int(vm.Memory))}...)
+	// Add cpus
+	// TODO
+	// Add ignition file
+	cmd = append(cmd, []string{"-fw_cfg", "name=opt/com.coreos/config,file=" + vm.IgnitionFilePath}...)
+	// Add qmp socket
+	monitor, err := NewQMPMonitor("unix", vm.Name, defaultQMPTimeout)
+	if err != nil {
+		return nil, err
+	}
+	vm.QMPMonitor = monitor
+	cmd = append(cmd, []string{"-qmp", monitor.Network + ":/" + monitor.Address + ",server,nowait"}...)
+
+	// Add network
+	cmd = append(cmd, "-nic", "user,model=virtio,hostfwd=tcp::"+strconv.Itoa(vm.Port)+"-:22")
+	vm.CmdLine = cmd
+	fmt.Println("///")
+	return vm, nil
+}
+
+// LoadByName reads a json file that describes a known qemu vm
+// and returns a vm instance
+func LoadVMByName(name string) (machine.VM, error) {
+	// TODO need to define an error relating to ErrMachineNotFound
+	vm := new(MachineVM)
+	vmConfigDir, err := machine.GetConfDir(vmtype)
+	if err != nil {
+		return nil, err
+	}
+	b, err := ioutil.ReadFile(filepath.Join(vmConfigDir, name+".json"))
+	if err != nil {
+		return nil, err
+	}
+	err = json.Unmarshal(b, vm)
+	logrus.Debug(vm.CmdLine)
+	return vm, err
+}
+
+// Create writes the json configuration file to the filesystem for
+// other verbs (start, stop)
+func (v *MachineVM) Create(opts machine.CreateOptions) error {
+	sshDir := filepath.Join(homedir.Get(), ".ssh")
+	// GetConfDir creates the directory so no need to check for
+	// its existence
+	vmConfigDir, err := machine.GetConfDir(vmtype)
+	if err != nil {
+		return err
+	}
+	jsonFile := filepath.Join(vmConfigDir, v.Name) + ".json"
+	v.IdentityPath = filepath.Join(sshDir, v.Name)
+
+	dd, err := machine.NewFcosDownloader(vmtype, v.Name)
+	if err != nil {
+		return err
+	}
+
+	v.ImagePath = dd.Get().LocalUncompressedFile
+	if err := dd.DownloadImage(); err != nil {
+		return err
+	}
+	// Add arch specific options including image location
+	v.CmdLine = append(v.CmdLine, v.addArchOptions()...)
+
+	// Add location of bootable image
+	v.CmdLine = append(v.CmdLine, "-drive", "if=virtio,file="+v.ImagePath)
+	// This kind of stinks but no other way around this r/n
+	uri := machine.SSHRemoteConnection.MakeSSHURL("localhost", "/run/user/1000/podman/podman.sock", strconv.Itoa(v.Port), v.RemoteUsername)
+	if err := machine.AddConnection(&uri, v.Name, filepath.Join(sshDir, v.Name), opts.IsDefault); err != nil {
+		return err
+	}
+	// Write the JSON file
+	b, err := json.MarshalIndent(v, "", " ")
+	if err != nil {
+		return err
+	}
+	if err := ioutil.WriteFile(jsonFile, b, 0644); err != nil {
+		return err
+	}
+	key, err := machine.CreateSSHKeys(v.IdentityPath)
+	if err != nil {
+		return err
+	}
+	// Run arch specific things that need to be done
+	if err := v.prepare(); err != nil {
+		return err
+	}
+	// Write the ignition file
+	return machine.NewIgnitionFile(opts.Username, key, v.IgnitionFilePath)
+}
+
+// Start executes the qemu command line and forks it
+func (v *MachineVM) Start(name string, _ machine.StartOptions) error {
+	var (
+		err error
+	)
+	attr := new(os.ProcAttr)
+	files := []*os.File{os.Stdin, os.Stdout, os.Stderr}
+	attr.Files = files
+	logrus.Debug(v.CmdLine)
+	_, err = os.StartProcess(v.CmdLine[0], v.CmdLine, attr)
+	return err
+}
+
+// Stop uses the qmp monitor to call a system_powerdown
+func (v *MachineVM) Stop(name string, _ machine.StopOptions) error {
+	// check if the qmp socket is there. if not, qemu instance is gone
+	if _, err := os.Stat(v.QMPMonitor.Address); os.IsNotExist(err) {
+		// Right now it is NOT an error to stop a stopped machine
+		logrus.Debugf("QMP monitor socket %v does not exist", v.QMPMonitor.Address)
+		return nil
+	}
+	qmpMonitor, err := qmp.NewSocketMonitor(v.QMPMonitor.Network, v.QMPMonitor.Address, v.QMPMonitor.Timeout)
+	if err != nil {
+		return err
+	}
+	// Simple JSON formation for the QAPI
+	stopCommand := struct {
+		Execute string `json:"execute"`
+	}{
+		Execute: "system_powerdown",
+	}
+	input, err := json.Marshal(stopCommand)
+	if err != nil {
+		return err
+	}
+	if err := qmpMonitor.Connect(); err != nil {
+		return err
+	}
+	defer func() {
+		if err := qmpMonitor.Disconnect(); err != nil {
+			logrus.Error(err)
+		}
+	}()
+	_, err = qmpMonitor.Run(input)
+	return err
+}
+
+// NewQMPMonitor creates the monitor subsection of our vm
+func NewQMPMonitor(network, name string, timeout time.Duration) (Monitor, error) {
+	rtDir, err := getSocketDir()
+	if err != nil {
+		return Monitor{}, err
+	}
+	rtDir = filepath.Join(rtDir, "podman")
+	if _, err := os.Stat(filepath.Join(rtDir)); os.IsNotExist(err) {
+		// TODO 0644 is fine on linux but macos is weird
+		if err := os.MkdirAll(rtDir, 0755); err != nil {
+			return Monitor{}, err
+		}
+	}
+	if timeout == 0 {
+		timeout = defaultQMPTimeout
+	}
+	monitor := Monitor{
+		Network: network,
+		Address: filepath.Join(rtDir, "qmp_"+name+".sock"),
+		Timeout: timeout,
+	}
+	return monitor, nil
+}
+
+func (v *MachineVM) Remove(name string, opts machine.RemoveOptions) (string, func() error, error) {
+	var (
+		files []string
+	)
+
+	// cannot remove a running vm
+	if v.isRunning() {
+		return "", nil, errors.Errorf("running vm %q cannot be destroyed", v.Name)
+	}
+
+	// Collect all the files that need to be destroyed
+	if !opts.SaveKeys {
+		files = append(files, v.IdentityPath, v.IdentityPath+".pub")
+	}
+	if !opts.SaveIgnition {
+		files = append(files, v.IgnitionFilePath)
+	}
+	if !opts.SaveImage {
+		files = append(files, v.ImagePath)
+	}
+	files = append(files, v.archRemovalFiles()...)
+
+	if err := machine.RemoveConnection(v.Name); err != nil {
+		logrus.Error(err)
+	}
+	vmConfigDir, err := machine.GetConfDir(vmtype)
+	if err != nil {
+		return "", nil, err
+	}
+	files = append(files, filepath.Join(vmConfigDir, v.Name+".json"))
+	confirmationMessage := "\nThe following files will be deleted:\n\n"
+	for _, msg := range files {
+		confirmationMessage += msg + "\n"
+	}
+	confirmationMessage += "\n"
+	return confirmationMessage, func() error {
+		for _, f := range files {
+			if err := os.Remove(f); err != nil {
+				logrus.Error(err)
+			}
+		}
+		return nil
+	}, nil
+}
+
+func (v *MachineVM) isRunning() bool {
+	// Check if qmp socket path exists
+	if _, err := os.Stat(v.QMPMonitor.Address); os.IsNotExist(err) {
+		return false
+	}
+	// Check if we can dial it
+	if _, err := qmp.NewSocketMonitor(v.QMPMonitor.Network, v.QMPMonitor.Address, v.QMPMonitor.Timeout); err != nil {
+		return false
+	}
+	return true
+}
+
+// SSH opens an interactive SSH session to the vm specified.
+// Added ssh function to VM interface: pkg/machine/config/go : line 58
+func (v *MachineVM) SSH(name string, opts machine.SSHOptions) error {
+	if !v.isRunning() {
+		return errors.Errorf("vm %q is not running.", v.Name)
+	}
+
+	sshDestination := v.RemoteUsername + "@localhost"
+	port := strconv.Itoa(v.Port)
+
+	args := []string{"-i", v.IdentityPath, "-p", port, sshDestination}
+	if opts.Execute {
+		args = append(args, opts.Args...)
+	} else {
+		fmt.Printf("Connecting to vm %s. To close connection, use `~.` or `exit`\n", v.Name)
+	}
+
+	cmd := exec.Command("ssh", args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Stdin = os.Stdin
+
+	return cmd.Run()
+}