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file_set.go
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file_set.go
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package eventline
import (
"archive/tar"
"bytes"
"errors"
"fmt"
"io/fs"
"os"
"path"
"time"
)
type FileSet struct {
Files map[string]*FileSetFile
}
type FileSetFile struct {
Content []byte
Mode os.FileMode
}
func NewFileSet() *FileSet {
return &FileSet{
Files: make(map[string]*FileSetFile),
}
}
func (s *FileSet) AddFile(filePath string, content []byte, mode os.FileMode) {
s.Files[filePath] = &FileSetFile{
Content: content,
Mode: mode,
}
}
func (s *FileSet) AddPrefix(prefix string) {
files := make(map[string]*FileSetFile, len(s.Files))
for filePath, file := range s.Files {
files[path.Join(prefix, filePath)] = file
}
s.Files = files
}
func (s *FileSet) Write(rootPath string) error {
if err := os.RemoveAll(rootPath); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
return fmt.Errorf("cannot delete directory %q: %w", rootPath, err)
}
}
if err := os.MkdirAll(rootPath, 0700); err != nil {
return fmt.Errorf("cannot create directory %q: %w", rootPath, err)
}
for filePath, file := range s.Files {
fullFilePath := path.Join(rootPath, filePath)
dirPath := path.Dir(fullFilePath)
if err := os.MkdirAll(dirPath, 0700); err != nil {
return fmt.Errorf("cannot create directory %q: %w", dirPath, err)
}
err := os.WriteFile(fullFilePath, file.Content, file.Mode)
if err != nil {
os.RemoveAll(rootPath) // best effort
return fmt.Errorf("cannot write %q: %w", fullFilePath, err)
}
}
return nil
}
func (s *FileSet) TarArchive(buf *bytes.Buffer) error {
now := time.Now().UTC()
w := tar.NewWriter(buf)
for filePath, file := range s.Files {
typeFlag := tar.TypeReg
header := tar.Header{
Typeflag: byte(typeFlag),
Name: filePath,
Size: int64(len(file.Content)),
Mode: int64(file.Mode),
ModTime: now,
}
if err := w.WriteHeader(&header); err != nil {
return fmt.Errorf("cannot write header: %w", err)
}
if _, err := w.Write(file.Content); err != nil {
return fmt.Errorf("cannot write content: %w", err)
}
}
if err := w.Close(); err != nil {
return fmt.Errorf("cannot close archive: %w", err)
}
return nil
}