mirror of
https://github.com/restic/restic.git
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257 lines
5.7 KiB
Go
257 lines
5.7 KiB
Go
package local
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import (
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"context"
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"io"
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"os"
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"path/filepath"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/fs"
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)
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// Local is a backend in a local directory.
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type Local struct {
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Config
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backend.Layout
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}
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// ensure statically that *Local implements restic.Backend.
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var _ restic.Backend = &Local{}
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const defaultLayout = "default"
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// Open opens the local backend as specified by config.
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func Open(cfg Config) (*Local, error) {
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debug.Log("open local backend at %v (layout %q)", cfg.Path, cfg.Layout)
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l, err := backend.ParseLayout(&backend.LocalFilesystem{}, cfg.Layout, defaultLayout, cfg.Path)
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if err != nil {
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return nil, err
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}
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be := &Local{Config: cfg, Layout: l}
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// create paths for data and refs. MkdirAll does nothing if the directory already exists.
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for _, d := range be.Paths() {
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err := fs.MkdirAll(d, backend.Modes.Dir)
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if err != nil {
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return nil, errors.Wrap(err, "MkdirAll")
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}
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}
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return be, nil
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}
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// Create creates all the necessary files and directories for a new local
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// backend at dir. Afterwards a new config blob should be created.
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func Create(cfg Config) (*Local, error) {
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debug.Log("create local backend at %v (layout %q)", cfg.Path, cfg.Layout)
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l, err := backend.ParseLayout(&backend.LocalFilesystem{}, cfg.Layout, defaultLayout, cfg.Path)
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if err != nil {
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return nil, err
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}
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be := &Local{
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Config: cfg,
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Layout: l,
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}
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// test if config file already exists
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_, err = fs.Lstat(be.Filename(restic.Handle{Type: restic.ConfigFile}))
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if err == nil {
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return nil, errors.New("config file already exists")
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}
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// create paths for data and refs
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for _, d := range be.Paths() {
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err := fs.MkdirAll(d, backend.Modes.Dir)
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if err != nil {
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return nil, errors.Wrap(err, "MkdirAll")
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}
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}
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return be, nil
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}
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// Location returns this backend's location (the directory name).
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func (b *Local) Location() string {
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return b.Path
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}
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// IsNotExist returns true if the error is caused by a non existing file.
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func (b *Local) IsNotExist(err error) bool {
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return os.IsNotExist(errors.Cause(err))
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}
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// Save stores data in the backend at the handle.
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func (b *Local) Save(ctx context.Context, h restic.Handle, rd io.Reader) (err error) {
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debug.Log("Save %v", h)
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if err := h.Valid(); err != nil {
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return err
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}
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filename := b.Filename(h)
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// create new file
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f, err := fs.OpenFile(filename, os.O_CREATE|os.O_EXCL|os.O_WRONLY, backend.Modes.File)
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if err != nil {
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return errors.Wrap(err, "OpenFile")
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}
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// save data, then sync
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_, err = io.Copy(f, rd)
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if err != nil {
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_ = f.Close()
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return errors.Wrap(err, "Write")
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}
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if err = f.Sync(); err != nil {
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_ = f.Close()
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return errors.Wrap(err, "Sync")
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}
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err = f.Close()
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if err != nil {
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return errors.Wrap(err, "Close")
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}
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// set mode to read-only
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fi, err := fs.Stat(filename)
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if err != nil {
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return errors.Wrap(err, "Stat")
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}
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return setNewFileMode(filename, fi)
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}
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// Load returns a reader that yields the contents of the file at h at the
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// given offset. If length is nonzero, only a portion of the file is
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// returned. rd must be closed after use.
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func (b *Local) Load(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {
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debug.Log("Load %v, length %v, offset %v", h, length, offset)
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if err := h.Valid(); err != nil {
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return nil, err
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}
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if offset < 0 {
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return nil, errors.New("offset is negative")
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}
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f, err := fs.Open(b.Filename(h))
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if err != nil {
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return nil, err
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}
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if offset > 0 {
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_, err = f.Seek(offset, 0)
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if err != nil {
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_ = f.Close()
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return nil, err
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}
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}
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if length > 0 {
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return backend.LimitReadCloser(f, int64(length)), nil
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}
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return f, nil
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}
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// Stat returns information about a blob.
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func (b *Local) Stat(ctx context.Context, h restic.Handle) (restic.FileInfo, error) {
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debug.Log("Stat %v", h)
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if err := h.Valid(); err != nil {
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return restic.FileInfo{}, err
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}
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fi, err := fs.Stat(b.Filename(h))
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if err != nil {
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return restic.FileInfo{}, errors.Wrap(err, "Stat")
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}
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return restic.FileInfo{Size: fi.Size()}, nil
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}
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// Test returns true if a blob of the given type and name exists in the backend.
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func (b *Local) Test(ctx context.Context, h restic.Handle) (bool, error) {
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debug.Log("Test %v", h)
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_, err := fs.Stat(b.Filename(h))
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if err != nil {
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if os.IsNotExist(errors.Cause(err)) {
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return false, nil
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}
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return false, errors.Wrap(err, "Stat")
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}
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return true, nil
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}
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// Remove removes the blob with the given name and type.
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func (b *Local) Remove(ctx context.Context, h restic.Handle) error {
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debug.Log("Remove %v", h)
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fn := b.Filename(h)
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// reset read-only flag
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err := fs.Chmod(fn, 0666)
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if err != nil {
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return errors.Wrap(err, "Chmod")
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}
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return fs.Remove(fn)
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}
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func isFile(fi os.FileInfo) bool {
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return fi.Mode()&(os.ModeType|os.ModeCharDevice) == 0
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}
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// List returns a channel that yields all names of blobs of type t. A
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// goroutine is started for this.
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func (b *Local) List(ctx context.Context, t restic.FileType) <-chan string {
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debug.Log("List %v", t)
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ch := make(chan string)
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go func() {
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defer close(ch)
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fs.Walk(b.Basedir(t), func(path string, fi os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if !isFile(fi) {
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return err
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}
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select {
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case ch <- filepath.Base(path):
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case <-ctx.Done():
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return err
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}
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return err
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})
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}()
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return ch
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}
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// Delete removes the repository and all files.
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func (b *Local) Delete() error {
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debug.Log("Delete()")
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return fs.RemoveAll(b.Path)
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}
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// Close closes all open files.
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func (b *Local) Close() error {
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debug.Log("Close()")
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// this does not need to do anything, all open files are closed within the
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// same function.
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return nil
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}
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