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user.go
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user.go
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package nodetasks
import (
"fmt"
"github.com/golang/glog"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/nodeup/cloudinit"
"k8s.io/kops/upup/pkg/fi/nodeup/local"
"k8s.io/kops/upup/pkg/fi/utils"
"os/exec"
)
// UserTask is responsible for creating a user, by calling useradd
type UserTask struct {
Name string
Shell string `json:"shell"`
Home string `json:"home"`
}
var _ fi.Task = &UserTask{}
func (e *UserTask) String() string {
return fmt.Sprintf("User: %s", e.Name)
}
func NewUserTask(name string, contents string, meta string) (fi.Task, error) {
s := &UserTask{Name: name}
err := utils.YamlUnmarshal([]byte(contents), s)
if err != nil {
return nil, fmt.Errorf("error parsing json for service %q: %v", name, err)
}
return s, nil
}
func (e *UserTask) Find(c *fi.Context) (*UserTask, error) {
info, err := fi.LookupUser(e.Name)
if err != nil {
return nil, err
}
if info == nil {
return nil, nil
}
actual := &UserTask{
Name: e.Name,
Shell: info.Shell,
Home: info.Home,
}
return actual, nil
}
func (e *UserTask) Run(c *fi.Context) error {
return fi.DefaultDeltaRunMethod(e, c)
}
func (_ *UserTask) CheckChanges(a, e, changes *UserTask) error {
return nil
}
func buildUseraddArgs(e *UserTask) []string {
var args []string
if e.Shell != "" {
args = append(args, "-s", e.Shell)
}
if e.Home != "" {
args = append(args, "-d", e.Home)
}
args = append(args, e.Name)
return args
}
func (_ *UserTask) RenderLocal(t *local.LocalTarget, a, e, changes *UserTask) error {
if a == nil {
args := buildUseraddArgs(e)
glog.Infof("Creating user %q", e.Name)
cmd := exec.Command("useradd", args...)
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("error creating user: %v\nOutput: %s", err, output)
}
} else {
var args []string
if changes.Shell != "" {
args = append(args, "-s", e.Shell)
}
if changes.Home != "" {
args = append(args, "-d", e.Home)
}
if len(args) != 0 {
args = append(args, e.Name)
glog.Infof("Reconfiguring user %q", e.Name)
cmd := exec.Command("usermod", args...)
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("error reconfiguring user: %v\nOutput: %s", err, output)
}
}
}
return nil
}
func (_ *UserTask) RenderCloudInit(t *cloudinit.CloudInitTarget, a, e, changes *UserTask) error {
args := buildUseraddArgs(e)
cmd := []string{"useradd"}
cmd = append(cmd, args...)
glog.Infof("Creating user %q", e.Name)
t.AddCommand(cloudinit.Once, cmd...)
return nil
}