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file.go
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file.go
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/*
Copyright 2019 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package nodetasks
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"syscall"
"k8s.io/klog/v2"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/nodeup/cloudinit"
"k8s.io/kops/upup/pkg/fi/nodeup/local"
)
const (
// FileType_Symlink defines a symlink
FileType_Symlink = "symlink"
// FileType_Directory defines a directory
FileType_Directory = "directory"
// FileType_File is a regular file
FileType_File = "file"
)
type File struct {
AfterFiles []string `json:"afterFiles,omitempty"`
BeforeServices []string `json:"beforeServices,omitempty"`
Contents fi.Resource `json:"contents,omitempty"`
Group *string `json:"group,omitempty"`
IfNotExists bool `json:"ifNotExists,omitempty"`
Mode *string `json:"mode,omitempty"`
OnChangeExecute [][]string `json:"onChangeExecute,omitempty"`
Owner *string `json:"owner,omitempty"`
Path string `json:"path,omitempty"`
Symlink *string `json:"symlink,omitempty"`
Type string `json:"type"`
}
var (
_ fi.Task = &File{}
_ fi.HasDependencies = &File{}
_ fi.HasName = &File{}
)
// GetDependencies implements HasDependencies::GetDependencies
func (e *File) GetDependencies(tasks map[string]fi.Task) []fi.Task {
var deps []fi.Task
if e.Owner != nil {
ownerTask := tasks["UserTask/"+*e.Owner]
if ownerTask == nil {
// The user might be a pre-existing user (e.g. admin)
klog.Warningf("Unable to find task %q", "UserTask/"+*e.Owner)
} else {
deps = append(deps, ownerTask)
}
}
// Requires parent directories to be created
deps = append(deps, findCreatesDirParents(e.Path, tasks)...)
if hasDep, ok := e.Contents.(fi.HasDependencies); ok {
deps = append(deps, hasDep.GetDependencies(tasks)...)
}
// Requires other files to be created first
for _, f := range e.AfterFiles {
for _, v := range tasks {
if file, ok := v.(*File); ok {
if file.Path == f {
deps = append(deps, v)
}
}
}
}
return deps
}
var _ fi.HasName = &File{}
func (f *File) GetName() *string {
return &f.Path
}
func (f *File) String() string {
return fmt.Sprintf("File: %q", f.Path)
}
var _ CreatesDir = &File{}
// Dir implements CreatesDir::Dir
func (f *File) Dir() string {
if f.Type != FileType_Directory {
return ""
}
return f.Path
}
func findFile(p string) (*File, error) {
stat, err := os.Lstat(p)
if err != nil {
if os.IsNotExist(err) {
return nil, nil
}
}
actual := &File{}
actual.Path = p
actual.Mode = fi.String(fi.FileModeToString(stat.Mode() & os.ModePerm))
uid := int(stat.Sys().(*syscall.Stat_t).Uid)
owner, err := fi.LookupUserByID(uid)
if err != nil {
return nil, err
}
if owner != nil {
actual.Owner = fi.String(owner.Name)
} else {
actual.Owner = fi.String(strconv.Itoa(uid))
}
gid := int(stat.Sys().(*syscall.Stat_t).Gid)
group, err := fi.LookupGroupByID(gid)
if err != nil {
return nil, err
}
if group != nil {
actual.Group = fi.String(group.Name)
} else {
actual.Group = fi.String(strconv.Itoa(gid))
}
if (stat.Mode() & os.ModeSymlink) != 0 {
target, err := os.Readlink(p)
if err != nil {
return nil, fmt.Errorf("error reading symlink target: %v", err)
}
actual.Type = FileType_Symlink
actual.Symlink = fi.String(target)
} else if (stat.Mode() & os.ModeDir) != 0 {
actual.Type = FileType_Directory
} else {
actual.Type = FileType_File
actual.Contents = fi.NewFileResource(p)
}
return actual, nil
}
func (e *File) Find(c *fi.Context) (*File, error) {
actual, err := findFile(e.Path)
if err != nil {
return nil, err
}
if actual == nil {
return nil, nil
}
// To avoid spurious changes
actual.IfNotExists = e.IfNotExists
if e.IfNotExists {
actual.Contents = e.Contents
}
actual.OnChangeExecute = e.OnChangeExecute
return actual, nil
}
func (e *File) Run(c *fi.Context) error {
return fi.DefaultDeltaRunMethod(e, c)
}
func (s *File) CheckChanges(a, e, changes *File) error {
return nil
}
func (_ *File) RenderLocal(t *local.LocalTarget, a, e, changes *File) error {
dirMode := os.FileMode(0o755)
fileMode, err := fi.ParseFileMode(fi.StringValue(e.Mode), 0o644)
if err != nil {
return fmt.Errorf("invalid file mode for %q: %q", e.Path, fi.StringValue(e.Mode))
}
if a != nil {
if e.IfNotExists {
klog.V(2).Infof("file exists and IfNotExists set; skipping %q", e.Path)
return nil
}
}
changed := false
if e.Type == FileType_Symlink {
if changes.Symlink != nil {
// This will currently fail if the target already exists.
// That's probably a good thing for now ... it is hard to know what to do here!
klog.Infof("Creating symlink %q -> %q", e.Path, *changes.Symlink)
err := os.Symlink(*changes.Symlink, e.Path)
if err != nil {
return fmt.Errorf("error creating symlink %q -> %q: %v", e.Path, *changes.Symlink, err)
}
changed = true
}
} else if e.Type == FileType_Directory {
if a == nil {
parent := filepath.Dir(strings.TrimSuffix(e.Path, "/"))
err := os.MkdirAll(parent, dirMode)
if err != nil {
return fmt.Errorf("error creating parent directories %q: %v", parent, err)
}
err = os.MkdirAll(e.Path, fileMode)
if err != nil {
return fmt.Errorf("error creating directory %q: %v", e.Path, err)
}
changed = true
}
} else if e.Type == FileType_File {
if changes.Contents != nil {
err = fi.WriteFile(e.Path, e.Contents, fileMode, dirMode, fi.StringValue(e.Owner), fi.StringValue(e.Group))
if err != nil {
return fmt.Errorf("error copying file %q: %v", e.Path, err)
}
changed = true
}
} else {
return fmt.Errorf("File type=%q not valid/supported", e.Type)
}
if changes.Mode != nil {
modeChanged, err := fi.EnsureFileMode(e.Path, fileMode)
if err != nil {
return fmt.Errorf("error changing mode on %q: %v", e.Path, err)
}
changed = changed || modeChanged
}
if changes.Owner != nil || changes.Group != nil {
ownerChanged, err := fi.EnsureFileOwner(e.Path, fi.StringValue(e.Owner), fi.StringValue(e.Group))
if err != nil {
return fmt.Errorf("error changing owner/group on %q: %v", e.Path, err)
}
changed = changed || ownerChanged
}
if changed && e.OnChangeExecute != nil {
for _, args := range e.OnChangeExecute {
human := strings.Join(args, " ")
klog.Infof("Changed; will execute OnChangeExecute command: %q", human)
cmd := exec.Command(args[0], args[1:]...)
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("error executing command %q: %v\nOutput: %s", human, err, output)
}
}
}
return nil
}
func (_ *File) RenderCloudInit(t *cloudinit.CloudInitTarget, a, e, changes *File) error {
dirMode := os.FileMode(0o755)
fileMode, err := fi.ParseFileMode(fi.StringValue(e.Mode), 0o644)
if err != nil {
return fmt.Errorf("invalid file mode for %s: %q", e.Path, *e.Mode)
}
if e.Type == FileType_Symlink {
t.AddCommand(cloudinit.Always, "ln", "-s", fi.StringValue(e.Symlink), e.Path)
} else if e.Type == FileType_Directory {
parent := filepath.Dir(strings.TrimSuffix(e.Path, "/"))
t.AddCommand(cloudinit.Once, "mkdir", "-p", "-m", fi.FileModeToString(dirMode), parent)
t.AddCommand(cloudinit.Once, "mkdir", "-m", fi.FileModeToString(dirMode), e.Path)
} else if e.Type == FileType_File {
err = t.WriteFile(e.Path, e.Contents, fileMode, dirMode)
if err != nil {
return err
}
} else {
return fmt.Errorf("File type=%q not valid/supported", e.Type)
}
if e.Owner != nil || e.Group != nil {
t.Chown(e.Path, fi.StringValue(e.Owner), fi.StringValue(e.Group))
}
if e.OnChangeExecute != nil {
return fmt.Errorf("OnChangeExecute not supported with CloudInit")
// t.AddCommand(cloudinit.Always, e.OnChangeExecute...)
}
return nil
}