/
dir.go
195 lines (180 loc) · 4.81 KB
/
dir.go
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package chezmoi
import (
"archive/tar"
"os"
"path/filepath"
"strings"
vfs "github.com/twpayne/go-vfs"
)
// DirAttributes holds attributes parsed from a source directory name.
type DirAttributes struct {
Name string
Exact bool
Perm os.FileMode
}
// A Dir represents the target state of a directory.
type Dir struct {
sourceName string
targetName string
Exact bool
Perm os.FileMode
Entries map[string]Entry
}
type dirConcreteValue struct {
Type string `json:"type" yaml:"type"`
SourcePath string `json:"sourcePath" yaml:"sourcePath"`
TargetPath string `json:"targetPath" yaml:"targetPath"`
Exact bool `json:"exact" yaml:"exact"`
Perm int `json:"perm" yaml:"perm"`
Entries []interface{} `json:"entries" yaml:"entries"`
}
// ParseDirAttributes parses a single directory name.
func ParseDirAttributes(sourceName string) DirAttributes {
name := sourceName
perm := os.FileMode(0777)
exact := false
if strings.HasPrefix(name, exactPrefix) {
name = strings.TrimPrefix(name, exactPrefix)
exact = true
}
if strings.HasPrefix(name, privatePrefix) {
name = strings.TrimPrefix(name, privatePrefix)
perm &= 0700
}
if strings.HasPrefix(name, dotPrefix) {
name = "." + strings.TrimPrefix(name, dotPrefix)
}
return DirAttributes{
Name: name,
Exact: exact,
Perm: perm,
}
}
// SourceName returns da's source name.
func (da DirAttributes) SourceName() string {
sourceName := ""
if da.Exact {
sourceName += exactPrefix
}
if da.Perm&os.FileMode(077) == os.FileMode(0) {
sourceName += privatePrefix
}
if strings.HasPrefix(da.Name, ".") {
sourceName += dotPrefix + strings.TrimPrefix(da.Name, ".")
} else {
sourceName += da.Name
}
return sourceName
}
// newDir returns a new directory state.
func newDir(sourceName string, targetName string, exact bool, perm os.FileMode) *Dir {
return &Dir{
sourceName: sourceName,
targetName: targetName,
Exact: exact,
Perm: perm,
Entries: make(map[string]Entry),
}
}
// Apply ensures that targetDir in fs matches d.
func (d *Dir) Apply(fs vfs.FS, targetDir string, umask os.FileMode, mutator Mutator) error {
targetPath := filepath.Join(targetDir, d.targetName)
info, err := fs.Lstat(targetPath)
switch {
case err == nil && info.Mode().IsDir():
if info.Mode().Perm() != d.Perm&^umask {
if err := mutator.Chmod(targetPath, d.Perm&^umask); err != nil {
return err
}
}
case err == nil:
if err := mutator.RemoveAll(targetPath); err != nil {
return err
}
fallthrough
case os.IsNotExist(err):
if err := mutator.Mkdir(targetPath, d.Perm&^umask); err != nil {
return err
}
default:
return err
}
for _, entryName := range sortedEntryNames(d.Entries) {
if err := d.Entries[entryName].Apply(fs, targetDir, umask, mutator); err != nil {
return err
}
}
if d.Exact {
infos, err := fs.ReadDir(targetPath)
if err != nil {
return err
}
for _, info := range infos {
name := info.Name()
if _, ok := d.Entries[name]; !ok {
if err := mutator.RemoveAll(filepath.Join(targetPath, name)); err != nil {
return err
}
}
}
}
return nil
}
// ConcreteValue implements Entry.ConcreteValue.
func (d *Dir) ConcreteValue(targetDir, sourceDir string, recursive bool) (interface{}, error) {
var entryConcreteValues []interface{}
if recursive {
for _, entryName := range sortedEntryNames(d.Entries) {
entryConcreteValue, err := d.Entries[entryName].ConcreteValue(targetDir, sourceDir, recursive)
if err != nil {
return nil, err
}
entryConcreteValues = append(entryConcreteValues, entryConcreteValue)
}
}
return &dirConcreteValue{
Type: "dir",
SourcePath: filepath.Join(sourceDir, d.SourceName()),
TargetPath: filepath.Join(targetDir, d.TargetName()),
Exact: d.Exact,
Perm: int(d.Perm),
Entries: entryConcreteValues,
}, nil
}
// Evaluate evaluates all entries in d.
func (d *Dir) Evaluate() error {
for _, entryName := range sortedEntryNames(d.Entries) {
if err := d.Entries[entryName].Evaluate(); err != nil {
return err
}
}
return nil
}
// Private returns true if d is private.
func (d *Dir) Private() bool {
return d.Perm&077 == 0
}
// SourceName implements Entry.SourceName.
func (d *Dir) SourceName() string {
return d.sourceName
}
// TargetName implements Entry.TargetName.
func (d *Dir) TargetName() string {
return d.targetName
}
// archive writes d to w.
func (d *Dir) archive(w *tar.Writer, headerTemplate *tar.Header, umask os.FileMode) error {
header := *headerTemplate
header.Typeflag = tar.TypeDir
header.Name = d.targetName
header.Mode = int64(d.Perm &^ umask)
if err := w.WriteHeader(&header); err != nil {
return err
}
for _, entryName := range sortedEntryNames(d.Entries) {
if err := d.Entries[entryName].archive(w, headerTemplate, umask); err != nil {
return err
}
}
return nil
}