podman/pkg/machine/qemu/config.go

package qemu

import (
	"encoding/json"
	"fmt"
	"io/fs"
	"os"
	"path/filepath"
	"strings"
	"time"

	"github.com/containers/common/pkg/config"
	"github.com/containers/podman/v4/pkg/machine"
	"github.com/containers/podman/v4/pkg/machine/compression"
	"github.com/containers/podman/v4/pkg/machine/define"
	"github.com/containers/podman/v4/pkg/machine/qemu/command"
	"github.com/containers/podman/v4/pkg/machine/sockets"
	"github.com/containers/podman/v4/pkg/machine/vmconfigs"
	"github.com/containers/podman/v4/utils"
	"github.com/docker/go-units"
	"github.com/sirupsen/logrus"
)

var (
	// defaultQMPTimeout is the timeout duration for the
	// qmp monitor interactions.
	defaultQMPTimeout = 2 * time.Second
)

type QEMUVirtualization struct {
	machine.Virtualization
}

// setNewMachineCMDOpts are options needed to pass
// into setting up the qemu command line.  long term, this need
// should be eliminated
// TODO Podman5
type setNewMachineCMDOpts struct {
	imageDir string
}

// findQEMUBinary locates and returns the QEMU binary
func findQEMUBinary() (string, error) {
	cfg, err := config.Default()
	if err != nil {
		return "", err
	}
	return cfg.FindHelperBinary(QemuCommand, true)
}

// setQMPMonitorSocket sets the virtual machine's QMP Monitor socket
func (v *MachineVM) setQMPMonitorSocket() error {
	monitor, err := NewQMPMonitor("unix", v.Name, defaultQMPTimeout)
	if err != nil {
		return err
	}
	v.QMPMonitor = monitor
	return nil
}

// setNewMachineCMD configure the CLI command that will be run to create the new
// machine
func (v *MachineVM) setNewMachineCMD(qemuBinary string, cmdOpts *setNewMachineCMDOpts) {
	v.CmdLine = command.NewQemuBuilder(qemuBinary, v.addArchOptions(cmdOpts))
	v.CmdLine.SetMemory(v.Memory)
	v.CmdLine.SetCPUs(v.CPUs)
	v.CmdLine.SetIgnitionFile(v.IgnitionFile)
	v.CmdLine.SetQmpMonitor(v.QMPMonitor)
	v.CmdLine.SetNetwork()
	v.CmdLine.SetSerialPort(v.ReadySocket, v.VMPidFilePath, v.Name)
	v.CmdLine.SetUSBHostPassthrough(v.USBs)
}

// NewMachine initializes an instance of a virtual machine based on the qemu
// virtualization.
func (p *QEMUVirtualization) NewMachine(opts machine.InitOptions) (machine.VM, error) {
	vm := new(MachineVM)
	if len(opts.Name) > 0 {
		vm.Name = opts.Name
	}

	dataDir, err := machine.GetDataDir(p.VMType())
	if err != nil {
		return nil, err
	}

	// set VM ignition file
	if err := machine.SetIgnitionFile(&vm.IgnitionFile, vmtype, vm.Name); err != nil {
		return nil, err
	}

	// set VM image file
	imagePath, err := define.NewMachineFile(opts.ImagePath, nil)
	if err != nil {
		return nil, err
	}
	vm.ImagePath = *imagePath

	vm.RemoteUsername = opts.Username

	// 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
	vm.DiskSize = opts.DiskSize
	if vm.USBs, err = command.ParseUSBs(opts.USBs); err != nil {
		return nil, err
	}

	vm.Created = time.Now()

	// find QEMU binary
	execPath, err := findQEMUBinary()
	if err != nil {
		return nil, err
	}

	if err := vm.setPIDSocket(); err != nil {
		return nil, err
	}

	// Add qmp socket
	if err := vm.setQMPMonitorSocket(); err != nil {
		return nil, err
	}

	runtimeDir, err := getRuntimeDir()
	if err != nil {
		return nil, err
	}
	symlink := vm.Name + "_ready.sock"
	if err := sockets.SetSocket(&vm.ReadySocket, sockets.ReadySocketPath(runtimeDir+"/podman/", vm.Name), &symlink); err != nil {
		return nil, err
	}

	// configure command to run
	cmdOpts := setNewMachineCMDOpts{imageDir: dataDir}
	vm.setNewMachineCMD(execPath, &cmdOpts)
	return vm, nil
}

// LoadVMByName reads a json file that describes a known qemu vm
// and returns a vm instance
func (p *QEMUVirtualization) LoadVMByName(name string) (machine.VM, error) {
	vm := &MachineVM{Name: name}
	vm.HostUser = vmconfigs.HostUser{UID: -1} // posix reserves -1, so use it to signify undefined
	if err := vm.update(); err != nil {
		return nil, err
	}

	lock, err := machine.GetLock(vm.Name, vmtype)
	if err != nil {
		return nil, err
	}
	vm.lock = lock

	return vm, nil
}

// List lists all vm's that use qemu virtualization
func (p *QEMUVirtualization) List(_ machine.ListOptions) ([]*machine.ListResponse, error) {
	return getVMInfos()
}

func getVMInfos() ([]*machine.ListResponse, error) {
	vmConfigDir, err := machine.GetConfDir(vmtype)
	if err != nil {
		return nil, err
	}

	var listed []*machine.ListResponse

	if err = filepath.WalkDir(vmConfigDir, func(path string, d fs.DirEntry, err error) error {
		vm := new(MachineVM)
		if strings.HasSuffix(d.Name(), ".json") {
			fullPath := filepath.Join(vmConfigDir, d.Name())
			b, err := os.ReadFile(fullPath)
			if err != nil {
				return err
			}
			if err = json.Unmarshal(b, vm); err != nil {
				return err
			}
			listEntry := new(machine.ListResponse)

			listEntry.Name = vm.Name
			listEntry.Stream = vm.ImageStream
			listEntry.VMType = "qemu"
			listEntry.CPUs = vm.CPUs
			listEntry.Memory = vm.Memory * units.MiB
			listEntry.DiskSize = vm.DiskSize * units.GiB
			listEntry.Port = vm.Port
			listEntry.RemoteUsername = vm.RemoteUsername
			listEntry.IdentityPath = vm.IdentityPath
			listEntry.CreatedAt = vm.Created
			listEntry.Starting = vm.Starting
			listEntry.UserModeNetworking = true // always true

			if listEntry.CreatedAt.IsZero() {
				listEntry.CreatedAt = time.Now()
				vm.Created = time.Now()
				if err := vm.writeConfig(); err != nil {
					return err
				}
			}

			state, err := vm.State(false)
			if err != nil {
				return err
			}
			listEntry.Running = state == define.Running
			listEntry.LastUp = vm.LastUp

			listed = append(listed, listEntry)
		}
		return nil
	}); err != nil {
		return nil, err
	}
	return listed, err
}

func (p *QEMUVirtualization) IsValidVMName(name string) (bool, error) {
	infos, err := getVMInfos()
	if err != nil {
		return false, err
	}
	for _, vm := range infos {
		if vm.Name == name {
			return true, nil
		}
	}
	return false, nil
}

// CheckExclusiveActiveVM checks if there is a VM already running
// that does not allow other VMs to be running
func (p *QEMUVirtualization) CheckExclusiveActiveVM() (bool, string, error) {
	vms, err := getVMInfos()
	if err != nil {
		return false, "", fmt.Errorf("checking VM active: %w", err)
	}
	// NOTE: Start() takes care of dealing with the "starting" state.
	for _, vm := range vms {
		if vm.Running {
			return true, vm.Name, nil
		}
	}
	return false, "", nil
}

// RemoveAndCleanMachines removes all machine and cleans up any other files associated with podman machine
func (p *QEMUVirtualization) RemoveAndCleanMachines() error {
	var (
		vm             machine.VM
		listResponse   []*machine.ListResponse
		opts           machine.ListOptions
		destroyOptions machine.RemoveOptions
	)
	destroyOptions.Force = true
	var prevErr error

	listResponse, err := p.List(opts)
	if err != nil {
		return err
	}

	for _, mach := range listResponse {
		vm, err = p.LoadVMByName(mach.Name)
		if err != nil {
			if prevErr != nil {
				logrus.Error(prevErr)
			}
			prevErr = err
		}
		_, remove, err := vm.Remove(mach.Name, destroyOptions)
		if err != nil {
			if prevErr != nil {
				logrus.Error(prevErr)
			}
			prevErr = err
		} else {
			if err := remove(); err != nil {
				if prevErr != nil {
					logrus.Error(prevErr)
				}
				prevErr = err
			}
		}
	}

	// Clean leftover files in data dir
	dataDir, err := machine.DataDirPrefix()
	if err != nil {
		if prevErr != nil {
			logrus.Error(prevErr)
		}
		prevErr = err
	} else {
		err := utils.GuardedRemoveAll(dataDir)
		if err != nil {
			if prevErr != nil {
				logrus.Error(prevErr)
			}
			prevErr = err
		}
	}

	// Clean leftover files in conf dir
	confDir, err := machine.ConfDirPrefix()
	if err != nil {
		if prevErr != nil {
			logrus.Error(prevErr)
		}
		prevErr = err
	} else {
		err := utils.GuardedRemoveAll(confDir)
		if err != nil {
			if prevErr != nil {
				logrus.Error(prevErr)
			}
			prevErr = err
		}
	}
	return prevErr
}

func (p *QEMUVirtualization) VMType() machine.VMType {
	return vmtype
}

func VirtualizationProvider() machine.VirtProvider {
	return &QEMUVirtualization{
		machine.NewVirtualization(define.Qemu, compression.Xz, define.Qcow, vmtype),
	}
}