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package os
import (
"io/ioutil"
"os"
"path"
"path/filepath"
"gopkg.in/src-d/go-git.v4/utils/fs"
)
// OS a filesystem base on the os filesystem
type OS struct {
base string
}
// NewOS returns a new OS filesystem
func NewOS(baseDir string) *OS {
return &OS{
base: baseDir,
}
}
// Create creates a file and opens it with standard permissions
// and modes O_RDWR, O_CREATE and O_TRUNC.
func (fs *OS) Create(filename string) (fs.File, error) {
return fs.OpenFile(filename, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
}
// OpenFile is equivalent to standard os.OpenFile.
// If flag os.O_CREATE is set, all parent directories will be created.
func (fs *OS) OpenFile(filename string, flag int, perm os.FileMode) (fs.File, error) {
fullpath := path.Join(fs.base, filename)
if flag|os.O_CREATE != 0 {
if err := fs.createDir(fullpath); err != nil {
return nil, err
}
}
f, err := os.OpenFile(fullpath, flag, perm)
if err != nil {
return nil, err
}
filename, err = filepath.Rel(fs.base, fullpath)
if err != nil {
return nil, err
}
return newOSFile(filename, f), nil
}
func (fs *OS) createDir(fullpath string) error {
dir := filepath.Dir(fullpath)
if dir != "." {
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
}
return nil
}
// ReadDir returns the filesystem info for all the archives under the specified
// path.
func (ofs *OS) ReadDir(path string) ([]fs.FileInfo, error) {
fullpath := ofs.Join(ofs.base, path)
l, err := ioutil.ReadDir(fullpath)
if err != nil {
return nil, err
}
var s = make([]fs.FileInfo, len(l))
for i, f := range l {
s[i] = f
}
return s, nil
}
func (fs *OS) Rename(from, to string) error {
from = fs.Join(fs.base, from)
to = fs.Join(fs.base, to)
if err := fs.createDir(to); err != nil {
return err
}
return os.Rename(from, to)
}
// Open opens a file in read-only mode.
func (fs *OS) Open(filename string) (fs.File, error) {
return fs.OpenFile(filename, os.O_RDONLY, 0)
}
// Stat returns the FileInfo structure describing file.
func (fs *OS) Stat(filename string) (fs.FileInfo, error) {
fullpath := fs.Join(fs.base, filename)
return os.Stat(fullpath)
}
func (fs *OS) Remove(filename string) error {
fullpath := fs.Join(fs.base, filename)
return os.Remove(fullpath)
}
func (fs *OS) TempFile(dir, prefix string) (fs.File, error) {
fullpath := fs.Join(fs.base, dir)
if err := fs.createDir(fullpath + string(os.PathSeparator)); err != nil {
return nil, err
}
f, err := ioutil.TempFile(fullpath, prefix)
if err != nil {
return nil, err
}
s, err := f.Stat()
if err != nil {
return nil, err
}
filename, err := filepath.Rel(fs.base, fs.Join(fullpath, s.Name()))
if err != nil {
return nil, err
}
return newOSFile(filename, f), nil
}
// Join joins the specified elements using the filesystem separator.
func (fs *OS) Join(elem ...string) string {
return filepath.Join(elem...)
}
// Dir returns a new Filesystem from the same type of fs using as baseDir the
// given path
func (fs *OS) Dir(path string) fs.Filesystem {
return NewOS(fs.Join(fs.base, path))
}
// Base returns the base path of the filesytem
func (fs *OS) Base() string {
return fs.base
}
// osFile represents a file in the os filesystem
type osFile struct {
fs.BaseFile
file *os.File
}
func newOSFile(filename string, file *os.File) fs.File {
return &osFile{
BaseFile: fs.BaseFile{BaseFilename: filename},
file: file,
}
}
func (f *osFile) Read(p []byte) (int, error) {
return f.file.Read(p)
}
func (f *osFile) Seek(offset int64, whence int) (int64, error) {
return f.file.Seek(offset, whence)
}
func (f *osFile) Write(p []byte) (int, error) {
return f.file.Write(p)
}
func (f *osFile) Close() error {
f.BaseFile.Closed = true
return f.file.Close()
}
func (f *osFile) ReadAt(p []byte, off int64) (n int, err error) {
return f.file.ReadAt(p, off)
}
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