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|
package preflight
import (
"bytes"
"errors"
"fmt"
"os"
"os/exec"
"os/user"
"path/filepath"
"regexp"
"strings"
"text/template"
"github.com/Masterminds/semver/v3"
"github.com/crc-org/crc/v2/pkg/crc/cache"
"github.com/crc-org/crc/v2/pkg/crc/constants"
"github.com/crc-org/crc/v2/pkg/crc/daemonclient"
"github.com/crc-org/crc/v2/pkg/crc/logging"
"github.com/crc-org/crc/v2/pkg/crc/machine/libvirt"
"github.com/crc-org/crc/v2/pkg/crc/systemd"
"github.com/crc-org/crc/v2/pkg/crc/systemd/states"
crcos "github.com/crc-org/crc/v2/pkg/os"
"github.com/crc-org/crc/v2/pkg/os/linux"
"libvirt.org/go/libvirtxml"
)
const (
// This is defined in https://github.com/crc-org/machine-driver-libvirt/blob/master/go.mod#L5
minSupportedLibvirtVersion = "8.0.0"
)
func checkRunningInsideWSL2() error {
version, err := os.ReadFile("/proc/version")
if err != nil {
return err
}
if strings.Contains(string(version), "Microsoft") {
logging.Debugf("Running inside WSL2 environment")
return fmt.Errorf("CRC is unsupported using WSL2")
}
return nil
}
func checkVirtualizationEnabled() error {
logging.Debug("Checking if the vmx/svm flags are present in /proc/cpuinfo")
// Check if the cpu flags vmx or svm is present
flags, err := getCPUFlags()
if err != nil {
return err
}
re := regexp.MustCompile(`(vmx|svm)`)
cputype := re.FindString(flags)
if cputype == "" {
return fmt.Errorf("Virtualization is not available for your CPU")
}
logging.Debug("CPU virtualization flags are good")
return nil
}
func fixVirtualizationEnabled() error {
return fmt.Errorf("You need to enable virtualization in BIOS")
}
func checkKvmEnabled() error {
logging.Debug("Checking if /dev/kvm exists")
// Check if /dev/kvm exists
if _, err := os.Stat("/dev/kvm"); os.IsNotExist(err) {
return fmt.Errorf("kvm kernel module is not loaded")
}
logging.Debug("/dev/kvm was found")
return nil
}
func fixKvmEnabled() error {
logging.Debug("Trying to load kvm module")
flags, err := getCPUFlags()
if err != nil {
return err
}
switch {
case strings.Contains(flags, "vmx"):
stdOut, stdErr, err := crcos.RunPrivileged("Loading kvm_intel kernel module", "modprobe", "kvm_intel")
if err != nil {
return fmt.Errorf("Failed to load kvm intel module: %s %v: %s", stdOut, err, stdErr)
}
case strings.Contains(flags, "svm"):
stdOut, stdErr, err := crcos.RunPrivileged("Loading kvm_amd kernel module", "modprobe", "kvm_amd")
if err != nil {
return fmt.Errorf("Failed to load kvm amd module: %s %v: %s", stdOut, err, stdErr)
}
default:
logging.Debug("Unable to detect processor details")
}
logging.Debug("kvm module loaded")
return nil
}
func getLibvirtCapabilities() (*libvirtxml.Caps, error) {
stdOut, _, err := crcos.RunWithDefaultLocale("virsh", "--readonly", "--connect", "qemu:///system", "capabilities")
if err != nil {
stdOut, _, err = crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///session", "capabilities")
if err != nil {
return nil, fmt.Errorf("Failed to run 'virsh capabilities': %v", err)
}
}
caps := &libvirtxml.Caps{}
err = caps.Unmarshal(stdOut)
if err != nil {
return nil, fmt.Errorf("Error parsing 'virsh capabilities': %v", err)
}
return caps, nil
}
func checkLibvirtInstalled() error {
logging.Debug("Checking if 'virsh' is available")
path, err := exec.LookPath("virsh")
if err != nil {
return fmt.Errorf("Libvirt cli virsh was not found in path")
}
logging.Debug("'virsh' was found in ", path)
logging.Debug("Checking 'virsh capabilities' for libvirtd/qemu availability")
caps, err := getLibvirtCapabilities()
if err != nil {
return err
}
foundHvm := false
for _, guest := range caps.Guests {
if guest.OSType == "hvm" && guest.Arch.Name == caps.Host.CPU.Arch {
logging.Debugf("Found %s hypervisor with 'hvm' capabilities", caps.Host.CPU.Arch)
foundHvm = true
break
}
}
if !foundHvm {
return fmt.Errorf("Could not find a %s hypervisor with 'hvm' capabilities", caps.Host.CPU.Arch)
}
return nil
}
func fixLibvirtInstalled(distro *linux.OsRelease) func() error {
return func() error {
logging.Debug("Trying to install libvirt")
stdOut, stdErr, err := crcos.RunPrivileged("Installing virtualization packages", "/bin/sh", "-c", installLibvirtCommand(distro))
if err != nil {
return fmt.Errorf("Could not install required packages: %s %v: %s", stdOut, err, stdErr)
}
logging.Debug("libvirt was successfully installed")
return nil
}
}
func installLibvirtCommand(distro *linux.OsRelease) string {
dnfCommand := "dnf install -y libvirt libvirt-daemon-kvm qemu-kvm"
switch {
case distroIsLike(distro, linux.Ubuntu):
return "apt-get update && apt-get install -y libvirt-daemon libvirt-daemon-system libvirt-clients"
case distroIsLike(distro, linux.Fedora):
return dnfCommand
default:
logging.Warnf("unsupported distribution %s, trying to install libvirt with dnf", distro)
return dnfCommand
}
}
func checkLibvirtVersion() error {
logging.Debugf("Checking if libvirt version is >=%s", minSupportedLibvirtVersion)
stdOut, _, err := crcos.RunWithDefaultLocale("virsh", "-v")
if err != nil {
return fmt.Errorf("Failed to run virsh")
}
installedLibvirtVersion, err := semver.NewVersion(strings.TrimSpace(stdOut))
if err != nil {
return fmt.Errorf("Unable to parse installed libvirt version %v", err)
}
supportedLibvirtVersion, err := semver.NewVersion(minSupportedLibvirtVersion)
if err != nil {
return fmt.Errorf("Unable to parse %s libvirt version %v", minSupportedLibvirtVersion, err)
}
if installedLibvirtVersion.LessThan(supportedLibvirtVersion) {
return fmt.Errorf("libvirt version %s is installed, but %s or higher is required", installedLibvirtVersion.String(), minSupportedLibvirtVersion)
}
return nil
}
func checkUserPartOfLibvirtGroup() error {
logging.Debug("Checking if current user is part of the libvirt group")
currentUser, err := user.Current()
if err != nil {
logging.Debugf("user.Current() failed: %v", err)
return fmt.Errorf("Failed to get current user id")
}
gids, err := currentUser.GroupIds()
if err != nil {
logging.Debugf("currentUser.GroupIds() failed: %v", err)
return fmt.Errorf("Failed to get the groups user '%s' belongs to", currentUser.Username)
}
for _, gid := range gids {
group, err := user.LookupGroupId(gid)
if err != nil {
logging.Debugf("Failed to lookup group id %s: %v", gid, err)
continue
}
if group.Name == "libvirt" {
logging.Debug("Current user is already in the libvirt group")
return nil
}
}
return fmt.Errorf("%s is not part of the libvirt group", currentUser.Username)
}
func fixUserPartOfLibvirtGroup() error {
logging.Debug("Adding current user to the libvirt group")
currentUser, err := user.Current()
if err != nil {
logging.Debugf("user.Current() failed: %v", err)
return fmt.Errorf("Failed to get current user id")
}
_, _, err = crcos.RunPrivileged("Adding user to the libvirt group", "usermod", "-a", "-G", "libvirt", currentUser.Username)
if err != nil {
return fmt.Errorf("Failed to add user to libvirt group")
}
logging.Debug("Current user is in the libvirt group")
return err
}
func checkCurrentGroups(distro *linux.OsRelease) func() error {
return func() error {
if !distroIsLike(distro, linux.Ubuntu) {
return nil
}
// After adding the user to the libvirt group, they need to relogin for the new group to be used by the currrent shell
gids, err := os.Getgroups()
if err != nil {
return err
}
for _, gid := range gids {
group, err := user.LookupGroupId(fmt.Sprintf("%d", gid))
if err != nil {
logging.Debugf("Failed to lookup group id %d: %v", gid, err)
continue
}
if group.Name == "libvirt" {
logging.Debug("libvirt group is active for the current user/process")
return nil
}
}
return fmt.Errorf("User in the currently active process is not part of the libvirt group")
}
}
func systemdUnitRunning(sd *systemd.Commander, unitName string) bool {
status, err := sd.Status(unitName)
if err != nil {
logging.Debugf("Could not get %s status: %v", unitName, err)
return false
}
switch status {
case states.Running:
logging.Debugf("%s is running", unitName)
return true
case states.Listening:
logging.Debugf("%s is listening", unitName)
return true
default:
logging.Debugf("%s is neither running nor listening", unitName)
return false
}
}
const (
vsockUnitName = "crc-vsock.socket"
vsockUnitTemplate = `[Unit]
Description=CRC vsock socket
[Socket]
ListenStream=vsock::%d
Service=crc-daemon.service
[Install]
WantedBy=default.target
`
httpUnitName = "crc-http.socket"
httpUnit = `[Unit]
Description=CRC HTTP socket
[Socket]
ListenStream=%h/.crc/crc-http.sock
Service=crc-daemon.service
[Install]
WantedBy=default.target
`
daemonUnitName = "crc-daemon.service"
daemonUnitTemplate = `
[Unit]
Description=CRC daemon
Requires=crc-http.socket
Requires=crc-vsock.socket
[Service]
# This allows systemd to know when startup is not complete (for example, because of a preflight failure)
# daemon.SdNotify(false, daemon.SdNotifyReady) must be called before the startup is successful
Type=notify
ExecStart=%s daemon
`
)
var vsockUnit = fmt.Sprintf(vsockUnitTemplate, constants.DaemonVsockPort)
func checkSystemdUnit(unitName string, unitContent string, shouldBeRunning bool) error {
sd := systemd.NewHostSystemdCommander().User()
logging.Debugf("Checking if %s is running", unitName)
running := systemdUnitRunning(sd, unitName)
if !running && shouldBeRunning {
return unitShouldBeRunningErr(unitName)
} else if running && !shouldBeRunning {
return unitShouldNotBeRunningErr(unitName)
}
logging.Debugf("Checking if %s has the expected content", unitName)
unitPath := systemd.UserUnitPath(unitName)
return crcos.FileContentMatches(unitPath, []byte(unitContent))
}
func daemonUnitContent() string {
return fmt.Sprintf(daemonUnitTemplate, constants.CrcSymlinkPath)
}
func checkDaemonSystemdSockets() error {
logging.Debug("Checking crc daemon systemd socket units")
if err := checkSystemdUnit(httpUnitName, httpUnit, true); err != nil {
return err
}
return checkSystemdUnit(vsockUnitName, vsockUnit, true)
}
func checkDaemonSystemdService() error {
logging.Debug("Checking crc daemon systemd service")
// the daemon should not be running at the end of setup, as it must be restarted on upgrades
shouldNotBeRunningErr := checkSystemdUnit(daemonUnitName, daemonUnitContent(), false)
if shouldNotBeRunningErr == nil {
return nil
}
if !errors.Is(shouldNotBeRunningErr, unitShouldNotBeRunningErr(daemonUnitName)) {
return shouldNotBeRunningErr
}
// daemon is running, check its version
version, err := daemonclient.GetVersionFromDaemonAPI()
if err != nil {
return shouldNotBeRunningErr
}
return daemonclient.CheckVersionMismatch(version)
}
func fixSystemdUnit(unitName string, unitContent string, shouldBeRunning bool) error {
logging.Debugf("Setting up %s", unitName)
sd := systemd.NewHostSystemdCommander().User()
if err := os.MkdirAll(systemd.UserUnitsDir(), 0750); err != nil {
return err
}
unitPath := systemd.UserUnitPath(unitName)
if crcos.FileContentMatches(unitPath, []byte(unitContent)) != nil {
logging.Debugf("Creating %s", unitPath)
if err := os.WriteFile(unitPath, []byte(unitContent), 0600); err != nil {
return err
}
_ = sd.DaemonReload()
}
running := systemdUnitRunning(sd, unitName)
if !running && shouldBeRunning {
logging.Debugf("Starting %s", unitName)
if err := sd.Enable(unitName); err != nil {
return err
}
return sd.Start(unitName)
} else if running && !shouldBeRunning {
logging.Debugf("Stopping %s", unitName)
return sd.Stop(unitName)
}
return nil
}
func fixDaemonSystemdSockets() error {
logging.Debugf("Setting up crc daemon systemd socket units")
if err := fixSystemdUnit(httpUnitName, httpUnit, true); err != nil {
return err
}
return fixSystemdUnit(vsockUnitName, vsockUnit, true)
}
func fixDaemonSystemdService() error {
logging.Debugf("Setting up crc daemon systemd unit")
return fixSystemdUnit(daemonUnitName, daemonUnitContent(), false)
}
func removeDaemonSystemdSockets() error {
logging.Debugf("Removing crc daemon systemd socket units")
sd := systemd.NewHostSystemdCommander().User()
_ = sd.Stop(httpUnitName)
os.Remove(systemd.UserUnitPath(httpUnitName))
_ = sd.Stop(vsockUnitName)
os.Remove(systemd.UserUnitPath(vsockUnitName))
return nil
}
func removeDaemonSystemdService() error {
logging.Debugf("Removing crc daemon systemd service")
sd := systemd.NewHostSystemdCommander().User()
_ = sd.Stop(daemonUnitName)
os.Remove(systemd.UserUnitPath(daemonUnitName))
return nil
}
func warnNoDaemonAutostart() error {
// only purpose of this check is to trigger a warning for RHEL7/CentOS7 users
logging.Warnf("systemd --user is not available, crc daemon won't be autostarted and must be run manually before using CRC")
return nil
}
func checkLibvirtServiceRunning() error {
logging.Debug("Checking if libvirtd service is running")
sd := systemd.NewHostSystemdCommander()
libvirtSystemdUnits := []string{"virtqemud.socket", "libvirtd.socket", "virtqemud.service", "libvirtd.service"}
for _, unit := range libvirtSystemdUnits {
if systemdUnitRunning(sd, unit) {
return nil
}
}
logging.Warnf("No active (running) libvirtd systemd unit could be found - make sure one of libvirt systemd units is enabled so that it's autostarted at boot time.")
return fmt.Errorf("found no active libvirtd systemd unit")
}
func fixLibvirtServiceRunning() error {
logging.Debug("Starting libvirtd.service")
sd := systemd.NewHostSystemdCommander()
/* split libvirt daemon is a bit tricky to startup properly as we'd
* need to start multiple components by hand, so we just start the
* monolithic daemon
*/
err := sd.Start("libvirtd")
if err != nil {
return fmt.Errorf("Failed to start libvirt service")
}
logging.Debug("libvirtd.service is running")
return nil
}
func checkMachineDriverLibvirtInstalled() error {
machineDriverLibvirt := cache.NewMachineDriverLibvirtCache()
logging.Debugf("Checking if %s is installed", machineDriverLibvirt.GetExecutableName())
if !machineDriverLibvirt.IsCached() {
return fmt.Errorf("%s executable is not cached", machineDriverLibvirt.GetExecutableName())
}
if err := machineDriverLibvirt.CheckVersion(); err != nil {
return err
}
logging.Debugf("%s is already installed", machineDriverLibvirt.GetExecutableName())
return nil
}
func fixMachineDriverLibvirtInstalled() error {
machineDriverLibvirt := cache.NewMachineDriverLibvirtCache()
logging.Debugf("Installing %s", machineDriverLibvirt.GetExecutableName())
if err := machineDriverLibvirt.EnsureIsCached(); err != nil {
return fmt.Errorf("Unable to download %s: %v", machineDriverLibvirt.GetExecutableName(), err)
}
logging.Debugf("%s is installed in %s", machineDriverLibvirt.GetExecutableName(), filepath.Dir(machineDriverLibvirt.GetExecutablePath()))
return nil
}
func checkLibvirtCrcNetworkAvailable() error {
logging.Debug("Checking if libvirt 'crc' network exists")
_, _, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-info", "crc")
if err != nil {
return fmt.Errorf("Libvirt network crc not found")
}
return checkLibvirtCrcNetworkDefinition()
}
func getLibvirtNetworkXML() (string, error) {
config := libvirt.NetworkConfig{
NetworkName: libvirt.DefaultNetwork,
MAC: libvirt.MACAddress,
IP: libvirt.IPAddress,
}
t, err := template.New("netxml").Parse(libvirt.NetworkTemplate)
if err != nil {
return "", err
}
var netXMLDef strings.Builder
err = t.Execute(&netXMLDef, config)
if err != nil {
return "", err
}
return netXMLDef.String(), nil
}
func fixLibvirtCrcNetworkAvailable() error {
logging.Debug("Creating libvirt 'crc' network")
netXMLDef, err := getLibvirtNetworkXML()
if err != nil {
logging.Debugf("getLibvirtNetworkXML() failed: %v", err)
return fmt.Errorf("Failed to read libvirt 'crc' network definition")
}
// For time being we are going to override the crc network according what we have in our binary template.
// We also don't care about the error or output from those commands atm.
// #nosec G204
_, _, _ = crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-destroy", libvirt.DefaultNetwork)
// #nosec G204
_, _, _ = crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-undefine", libvirt.DefaultNetwork)
// Create the network according to our defined template
cmd := exec.Command("virsh", "--connect", "qemu:///system", "net-define", "/dev/stdin")
cmd.Stdin = strings.NewReader(netXMLDef)
buf := new(bytes.Buffer)
cmd.Stderr = buf
err = cmd.Run()
if err != nil {
logging.Debugf("%v : %s", err, buf.String())
return fmt.Errorf("Failed to create libvirt 'crc' network: %v - %s", err, buf.String())
}
logging.Debug("libvirt 'crc' network created")
return nil
}
func removeLibvirtCrcNetwork() error {
logging.Debug("Removing libvirt 'crc' network")
_, _, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-info", libvirt.DefaultNetwork)
if err != nil {
// Ignore if no crc network exists for libvirt
// User may have manually deleted the `crc` network from libvirt
return nil
}
_, stderr, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-destroy", libvirt.DefaultNetwork)
if err != nil {
logging.Debugf("%v : %s", err, stderr)
return fmt.Errorf("Failed to destroy libvirt 'crc' network")
}
_, stderr, err = crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-undefine", libvirt.DefaultNetwork)
if err != nil {
logging.Debugf("%v : %s", err, stderr)
return fmt.Errorf("Failed to undefine libvirt 'crc' network")
}
logging.Debug("libvirt 'crc' network removed")
return nil
}
func removeCrcVM() error {
stdout, _, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "domstate", constants.DefaultName)
if err != nil {
// User may have run `crc delete` before `crc cleanup`
// in that case there is no crc vm so return early.
return nil
}
if strings.TrimSpace(stdout) == "running" {
_, stderr, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "destroy", constants.DefaultName)
if err != nil {
logging.Debugf("%v : %s", err, stderr)
return fmt.Errorf("Failed to destroy 'crc' VM")
}
}
_, stderr, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "undefine", constants.DefaultName)
if err != nil {
logging.Debugf("%v : %s", err, stderr)
return fmt.Errorf("Failed to undefine 'crc' VM")
}
logging.Debug("'crc' VM is removed")
return nil
}
func removeLibvirtStoragePool() error {
_, stderr, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "pool-info", constants.DefaultName)
if err != nil {
logging.Debugf("%v : %s", err, stderr)
// Pool does not exist
return nil
}
_, stderr, err = crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "pool-destroy", constants.DefaultName)
if err != nil {
logging.Debugf("%v : %s", err, stderr)
// ignore error, we want to try to delete the pool regardless of success or not
}
_, stderr, err = crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "pool-undefine", constants.DefaultName)
if err != nil {
logging.Debugf("%v : %s", err, stderr)
return fmt.Errorf("Failed to undefine 'crc' libvirt storage pool")
}
logging.Debug("'crc' libvirt storage has been removed")
return nil
}
func trimSpacesFromXML(str string) string {
strs := strings.Split(str, "\n")
var builder strings.Builder
for _, s := range strs {
builder.WriteString(strings.TrimSpace(s))
}
return builder.String()
}
func checkLibvirtCrcNetworkDefinition() error {
logging.Debug("Checking if libvirt 'crc' definition is up to date")
stdOut, _, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-dumpxml", "--inactive", "crc")
if err != nil {
return fmt.Errorf("Failed to get 'crc' network XML: %s", err)
}
stdOut = trimSpacesFromXML(stdOut)
netXMLDef, err := getLibvirtNetworkXML()
if err != nil {
return fmt.Errorf("Failed to generate 'crc' network XML from template: %s", err)
}
netXMLDef = trimSpacesFromXML(netXMLDef)
if stdOut != netXMLDef {
logging.Debugf("libvirt 'crc' network definition does not have the expected value")
logging.Debugf("expected: %s", netXMLDef)
logging.Debugf("current: %s", stdOut)
return fmt.Errorf("libvirt 'crc' network definition is incorrect")
}
logging.Debugf("libvirt 'crc' network has the expected value")
return nil
}
func checkLibvirtCrcNetworkActive() error {
logging.Debug("Checking if libvirt 'crc' network is active")
stdOut, _, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-info", "crc")
if err != nil {
return fmt.Errorf("Failed to query 'crc' network information")
}
outputSlice := strings.Split(stdOut, "\n")
for _, stdOut = range outputSlice {
stdOut = strings.TrimSpace(stdOut)
if strings.HasPrefix(stdOut, "Active") && strings.Contains(stdOut, "yes") {
logging.Debug("libvirt 'crc' network is already active")
return nil
}
}
return fmt.Errorf("Libvirt crc network is not active")
}
func fixLibvirtCrcNetworkActive() error {
logging.Debug("Starting libvirt 'crc' network")
stdOut, stdErr, err := crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-start", "crc")
if err != nil {
return fmt.Errorf("Failed to start libvirt 'crc' network %s %v: %s", stdOut, err, stdErr)
}
stdOut, stdErr, err = crcos.RunWithDefaultLocale("virsh", "--connect", "qemu:///system", "net-autostart", "crc")
if err != nil {
return fmt.Errorf("Failed to autostart libvirt 'crc' network %s %v: %s", stdOut, err, stdErr)
}
logging.Debug("libvirt 'crc' network started")
return nil
}
func getCPUFlags() (string, error) {
// Check if the cpu flags vmx or svm is present
out, err := os.ReadFile("/proc/cpuinfo")
if err != nil {
logging.Debugf("Failed to read /proc/cpuinfo: %v", err)
return "", fmt.Errorf("Failed to read /proc/cpuinfo")
}
re := regexp.MustCompile(`flags.*:.*`)
flags := re.FindString(string(out))
if flags == "" {
return "", fmt.Errorf("Could not find cpu flags from /proc/cpuinfo")
}
return flags, nil
}
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