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filesystemEntries.go
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/
filesystemEntries.go
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// Copyright 2018 CoreOS, Inc.
//
// 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 files
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"syscall"
configUtil "github.com/coreos/ignition/config/util"
"github.com/coreos/ignition/internal/config/types"
"github.com/coreos/ignition/internal/exec/util"
"github.com/coreos/ignition/internal/log"
)
// createFilesystemsEntries creates the files described in config.Storage.{Files,Directories}.
func (s *stage) createFilesystemsEntries(config types.Config) error {
if len(config.Storage.Filesystems) == 0 {
return nil
}
s.Logger.PushPrefix("createFilesystemsFiles")
defer s.Logger.PopPrefix()
entryMap, err := s.mapEntriesToFilesystems(config)
if err != nil {
return err
}
for fs, f := range entryMap {
if err := s.createEntries(fs, f); err != nil {
return fmt.Errorf("failed to create files: %v", err)
}
}
return nil
}
// filesystemEntry represent a thing that knows how to create itself.
type filesystemEntry interface {
create(l *log.Logger, u util.Util) error
getPath() string
}
type fileEntry types.File
func (tmp fileEntry) getPath() string {
return types.File(tmp).Path
}
func (tmp fileEntry) create(l *log.Logger, u util.Util) error {
f := types.File(tmp)
fetchOp := u.PrepareFetch(l, f)
if fetchOp == nil {
return fmt.Errorf("failed to resolve file %q", f.Path)
}
msg := "writing file %q"
if f.Append {
msg = "appending to file %q"
}
if err := l.LogOp(
func() error {
err := u.DeletePathOnOverwrite(f.Node)
if err != nil {
return err
}
return u.PerformFetch(fetchOp)
}, msg, string(f.Path),
); err != nil {
return fmt.Errorf("failed to create file %q: %v", fetchOp.Path, err)
}
return nil
}
type dirEntry types.Directory
func (tmp dirEntry) getPath() string {
return types.Directory(tmp).Path
}
func (tmp dirEntry) create(l *log.Logger, u util.Util) error {
d := types.Directory(tmp)
err := l.LogOp(func() error {
path, err := u.JoinPath(string(d.Path))
if err != nil {
return err
}
if err := u.DeletePathOnOverwrite(d.Node); err != nil {
return err
}
uid, gid, err := u.ResolveNodeUidAndGid(d.Node, 0, 0)
if err != nil {
return err
}
// Build a list of paths to create. Since os.MkdirAll only sets the mode for new directories and not the
// ownership, we need to determine which directories will be created so we don't chown something that already
// exists.
newPaths := []string{path}
for p := filepath.Dir(path); p != "/"; p = filepath.Dir(p) {
_, err := os.Stat(p)
if err == nil {
break
}
if !os.IsNotExist(err) {
return err
}
newPaths = append(newPaths, p)
}
if d.Mode == nil {
d.Mode = configUtil.IntToPtr(0)
}
if err := os.MkdirAll(path, os.FileMode(*d.Mode)); err != nil {
return err
}
for _, newPath := range newPaths {
if err := os.Chmod(newPath, os.FileMode(*d.Mode)); err != nil {
return err
}
if err := os.Chown(newPath, uid, gid); err != nil {
return err
}
}
return nil
}, "creating directory %q", string(d.Path))
if err != nil {
return fmt.Errorf("failed to create directory %q: %v", d.Path, err)
}
return nil
}
type linkEntry types.Link
func (tmp linkEntry) getPath() string {
return types.Link(tmp).Path
}
func (tmp linkEntry) create(l *log.Logger, u util.Util) error {
s := types.Link(tmp)
if err := l.LogOp(
func() error {
err := u.DeletePathOnOverwrite(s.Node)
if err != nil {
return err
}
return u.WriteLink(s)
}, "writing link %q -> %q", s.Path, s.Target,
); err != nil {
return fmt.Errorf("failed to create link %q: %v", s.Path, err)
}
return nil
}
// ByDirectorySegments is used to sort directories so /foo gets created before /foo/bar if they are both specified.
type ByDirectorySegments []types.Directory
func (lst ByDirectorySegments) Len() int { return len(lst) }
func (lst ByDirectorySegments) Swap(i, j int) {
lst[i], lst[j] = lst[j], lst[i]
}
func (lst ByDirectorySegments) Less(i, j int) bool {
return depth(lst[i].Node) < depth(lst[j].Node)
}
func depth(n types.Node) uint {
var count uint = 0
for p := filepath.Clean(string(n.Path)); p != "/"; count++ {
p = filepath.Dir(p)
}
return count
}
// mapEntriesToFilesystems builds a map of filesystems to files. If multiple
// definitions of the same filesystem are present, only the final definition is
// used. The directories are sorted to ensure /foo gets created before /foo/bar.
func (s stage) mapEntriesToFilesystems(config types.Config) (map[types.Filesystem][]filesystemEntry, error) {
filesystems := map[string]types.Filesystem{}
for _, fs := range config.Storage.Filesystems {
filesystems[fs.Name] = fs
}
entryMap := map[types.Filesystem][]filesystemEntry{}
// Sort directories to ensure /a gets created before /a/b.
sortedDirs := config.Storage.Directories
sort.Stable(ByDirectorySegments(sortedDirs))
// Add directories first to ensure they are created before files.
for _, d := range sortedDirs {
if fs, ok := filesystems[d.Filesystem]; ok {
entryMap[fs] = append(entryMap[fs], dirEntry(d))
} else {
s.Logger.Crit("the filesystem (%q), was not defined", d.Filesystem)
return nil, ErrFilesystemUndefined
}
}
for _, f := range config.Storage.Files {
if fs, ok := filesystems[f.Filesystem]; ok {
entryMap[fs] = append(entryMap[fs], fileEntry(f))
} else {
s.Logger.Crit("the filesystem (%q), was not defined", f.Filesystem)
return nil, ErrFilesystemUndefined
}
}
for _, sy := range config.Storage.Links {
if fs, ok := filesystems[sy.Filesystem]; ok {
entryMap[fs] = append(entryMap[fs], linkEntry(sy))
} else {
s.Logger.Crit("the filesystem (%q), was not defined", sy.Filesystem)
return nil, ErrFilesystemUndefined
}
}
return entryMap, nil
}
// createEntries creates any files or directories listed for the filesystem in Storage.{Files,Directories}.
func (s *stage) createEntries(fs types.Filesystem, files []filesystemEntry) error {
s.Logger.PushPrefix("createFiles")
defer s.Logger.PopPrefix()
var mnt string
if fs.Path == nil {
var err error
mnt, err = ioutil.TempDir("", "ignition-files")
if err != nil {
return fmt.Errorf("failed to create temp directory: %v", err)
}
defer os.Remove(mnt)
dev := string(fs.Mount.Device)
format := string(fs.Mount.Format)
if err := s.Logger.LogOp(
func() error { return syscall.Mount(dev, mnt, format, 0, "") },
"mounting %q at %q", dev, mnt,
); err != nil {
return fmt.Errorf("failed to mount device %q at %q: %v", dev, mnt, err)
}
defer s.Logger.LogOp(
func() error { return syscall.Unmount(mnt, 0) },
"unmounting %q at %q", dev, mnt,
)
} else {
mnt = *fs.Path
}
u := util.Util{
DestDir: mnt,
IsRoot: fs.Name == "root",
Root: s.Util.Root,
Fetcher: s.Util.Fetcher,
Logger: s.Logger,
}
for _, e := range files {
path := e.getPath()
// only relabel things on the root filesystem
if fs.Name == "root" && s.relabeling() {
// relabel from the first parent dir that we'll have to create --
// alternatively, we could make `MkdirForFile` fancier instead of
// using `os.MkdirAll`, though that's quite a lot of levels to plumb
// through
relabelFrom := path
dir := filepath.Dir(path)
for {
exists, err := u.PathExists(dir)
if err != nil {
return err
}
// we're done on the first hit -- also sanity check we didn't
// somehow get all the way up to /
if exists || dir == "/" {
break
}
relabelFrom = dir
dir = filepath.Dir(dir)
}
s.relabel(relabelFrom)
}
if err := e.create(s.Logger, u); err != nil {
return err
}
}
return nil
}