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cloudinit.go
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cloudinit.go
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package vmwarevsphere
import (
"encoding/base64"
"fmt"
"net/url"
"os"
"os/exec"
"path/filepath"
"github.com/rancher/machine/libmachine/log"
"github.com/vmware/govmomi/object"
"github.com/vmware/govmomi/vim25/soap"
"github.com/vmware/govmomi/vim25/types"
"gopkg.in/yaml.v2"
)
const (
isoName = "user-data.iso"
isoDir = "cloudinit"
mkisofsName = "mkisofs"
)
func (d *Driver) cloudInit(vm *object.VirtualMachine) error {
if d.CreationType == creationTypeLegacy {
return d.cloudInitGuestInfo(vm)
}
if err := d.createCloudInitIso(); err != nil {
return err
}
ds, err := d.getVmDatastore(vm)
if err != nil {
return err
}
err = d.uploadCloudInitIso(vm, d.datacenter, ds)
if err != nil {
return err
}
return d.mountCloudInitIso(vm, d.datacenter, ds)
}
func (d *Driver) cloudInitGuestInfo(vm *object.VirtualMachine) error {
if d.CloudInit != "" {
var opts []types.BaseOptionValue
if _, err := url.ParseRequestURI(d.CloudInit); err == nil {
log.Infof("setting guestinfo.cloud-init.data.url to %s\n", d.CloudInit)
opts = append(opts, &types.OptionValue{
Key: "guestinfo.cloud-init.config.url",
Value: d.CloudInit,
})
} else {
if _, err := os.Stat(d.CloudInit); err == nil {
if value, err := os.ReadFile(d.CloudInit); err == nil {
log.Infof("setting guestinfo.cloud-init.data to encoded content of %s\n", d.CloudInit)
encoded := base64.StdEncoding.EncodeToString(value)
opts = append(opts, &types.OptionValue{
Key: "guestinfo.cloud-init.config.data",
Value: encoded,
})
opts = append(opts, &types.OptionValue{
Key: "guestinfo.cloud-init.data.encoding",
Value: "base64",
})
}
}
}
return d.applyOpts(vm, opts)
}
return nil
}
func (d *Driver) uploadCloudInitIso(vm *object.VirtualMachine, dc *object.Datacenter, ds *object.Datastore) error {
log.Infof("Uploading %s", isoName)
path, err := d.getVmFolder(vm)
if err != nil {
return err
}
p := soap.DefaultUpload
c, err := d.getSoapClient()
if err != nil {
return err
}
dsurl := ds.NewURL(filepath.Join(path, isoName))
if err = c.Client.UploadFile(d.getCtx(), d.ResolveStorePath(filepath.Join(isoDir, isoName)), dsurl, &p); err != nil {
return err
}
return nil
}
func (d *Driver) removeCloudInitIso(vm *object.VirtualMachine, dc *object.Datacenter, ds *object.Datastore) error {
log.Infof("Removing %s", isoName)
c, err := d.getSoapClient()
if err != nil {
return err
}
path, err := d.getVmFolder(vm)
if err != nil {
return err
}
m := object.NewFileManager(c.Client)
task, err := m.DeleteDatastoreFile(d.getCtx(), ds.Path(filepath.Join(path, isoName)), dc)
if err != nil {
return err
}
if err = task.Wait(d.getCtx()); err != nil {
if types.IsFileNotFound(err) {
// already deleted, ignore error
return nil
}
return err
}
return nil
}
func (d *Driver) createCloudInitIso() error {
log.Infof("Creating cloud-init.iso")
// d.CloudConfig stat'ed and loaded in flag load.
sshkey, err := os.ReadFile(d.publicSSHKeyPath())
if err != nil {
return err
}
userdatacontent, err := d.addSSHUserToYaml(string(sshkey))
if err != nil {
return err
}
perm := os.FileMode(0700)
isoDir := d.ResolveStorePath(isoDir)
dataDir := filepath.Join(isoDir, "data")
userdata := filepath.Join(dataDir, "user-data")
metadata := filepath.Join(dataDir, "meta-data")
err = os.MkdirAll(dataDir, perm)
if err != nil {
return err
}
writeYaml := fmt.Sprintf("#cloud-config\n%s", userdatacontent)
if err = os.WriteFile(userdata, []byte(writeYaml), perm); err != nil {
return err
}
md := []byte(fmt.Sprintf("local-hostname: %s\n", d.MachineName))
if err = os.WriteFile(metadata, md, perm); err != nil {
return err
}
// validate that our files are present in the isoDir before creating the ISO
for filename, filepath := range map[string]string{"user-data": userdata, "meta-data": metadata} {
_, err = os.Stat(filepath)
if err != nil {
return fmt.Errorf("error: %s found when verifying that %s file was present for machine %s", err, filename, d.MachineName)
}
}
err = os.Chdir(filepath.Join(d.StorePath, "machines", d.MachineName))
if err != nil {
return err
}
diskImg := filepath.Join(isoDir, isoName)
// making iso
// iso-level 1 ensures that files may only consist of one section and filenames are restricted to 8.3 characters.
// this maintains backwards compatibility with the previous go-diskfs method of creating ISOs
path, err := binaryPathLookup(mkisofsName)
if err != nil {
return fmt.Errorf("createCloudInitIso: path lookup for %s failed: %v", mkisofsName, err)
}
isoArgs := []string{"-J", "-r", "-hfs", "-iso-level", "1", "-V", "cidata", "-output",
fmt.Sprintf("%s", diskImg), "-graft-points", fmt.Sprintf("%s", dataDir)}
iso := exec.Command(path, isoArgs...)
iso.Env = []string{
"PATH=" + os.Getenv("PATH"),
}
iso.Stdout = os.Stdout
iso.Stderr = os.Stderr
err = iso.Start()
if err != nil {
return fmt.Errorf("createCloudInitIso: mkisofs command failed to start with error %v", err)
}
log.Debugf("createCloudInitIso: Waiting for mkisofs command to finish...")
err = iso.Wait()
if err != nil {
return fmt.Errorf("createCloudInitIso: mkisofs command failed to complete with error: %v", err)
}
log.Debugf("createCloudInitIso: mkisofs command successfully finished")
return nil
}
func (d *Driver) mountCloudInitIso(vm *object.VirtualMachine, dc *object.Datacenter, dss *object.Datastore) error {
log.Debugf("Mounting cloudinit %s", isoName)
devices, err := vm.Device(d.getCtx())
if err != nil {
return err
}
ide, err := devices.FindIDEController("")
if err != nil {
return err
}
var add []types.BaseVirtualDevice
cdrom, err := devices.CreateCdrom(ide)
if err != nil {
return err
}
path, err := d.getVmFolder(vm)
if err != nil {
return err
}
add = append(add, devices.InsertIso(cdrom, dss.Path(filepath.Join(path, isoName))))
return vm.AddDevice(d.getCtx(), add...)
}
// addSSHUserToYaml parses user, group, and sshkey params that are passed in
// and appends them to the existing cloud-config (cloudInit) userdata file
// there is OS specific logic for linux and windows
// Windows leverages cloudbase-init as cloudinit is unsupported on Windows
// https://cloudbase-init.readthedocs.io/en/latest/
func (d *Driver) addSSHUserToYaml(sshkey string) (string, error) {
var (
sshUser = d.SSHUser
group = d.SSHUserGroup
yamlcontent = d.CloudConfig
)
cf := make(map[interface{}]interface{})
if err := yaml.Unmarshal([]byte(yamlcontent), &cf); err != nil {
return "", err
}
commonUser := map[interface{}]interface{}{
"name": sshUser,
"lock_passwd": true,
"groups": group,
"ssh_authorized_keys": []string{
sshkey,
},
}
switch d.OS {
default:
log.Debug("[addSSHUserToYaml] Adding linux ssh user to cloud-init")
// implements https://github.com/canonical/cloud-init/blob/master/cloudinit/config/cc_users_groups.py#L28-L71
// technically not in the spec, see this code for context
// https://github.com/canonical/cloud-init/blob/master/cloudinit/distros/__init__.py#L394-L397
commonUser["sudo"] = "ALL=(ALL) NOPASSWD:ALL"
commonUser["create_groups"] = false
commonUser["no_user_group"] = true
// Administrator is the default ssh user on Windows Server 2019/2022
// This implements cloudbase-init for Windows VMs as cloud-init doesn't support Windows
// https://cloudbase-init.readthedocs.io/en/latest/
// On Windows, primary_group and groups are concatenated.
case WindowsMachineOS:
log.Debug("[addSSHUserToYaml] Adding windows ssh user to cloud-init")
commonUser["inactive"] = false
}
if val, ok := cf["users"]; ok {
u := val.([]interface{})
cf["users"] = append(u, commonUser)
} else {
users := make([]interface{}, 1)
users[0] = commonUser
cf["users"] = users
}
if val, ok := cf["groups"]; ok {
g := val.([]interface{})
var exists = false
for _, v := range g {
if y, _ := v.(string); y == group {
exists = true
}
}
if !exists {
cf["groups"] = append(g, group)
}
} else {
g := make([]interface{}, 1)
g[0] = group
cf["groups"] = g
}
yaml, err := yaml.Marshal(cf)
if err != nil {
return "", err
}
return string(yaml), nil
}
func binaryPathLookup(name string) (string, error) {
path, err := exec.LookPath(name)
if err != nil {
return "", fmt.Errorf("binaryPathLookup: error returned when trying to find [%s] executable: [%v]", name, err)
}
return path, nil
}