restic/internal/backend/layout_default.go

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package backend
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import (
"encoding/hex"
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"github.com/restic/restic/internal/restic"
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)
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// DefaultLayout implements the default layout for local and sftp backends, as
// described in the Design document. The `data` directory has one level of
// subdirs, two characters each (taken from the first two characters of the
// file name).
type DefaultLayout struct {
Path string
Join func(...string) string
}
var defaultLayoutPaths = map[restic.FileType]string{
restic.DataFile: "data",
restic.SnapshotFile: "snapshots",
restic.IndexFile: "index",
restic.LockFile: "locks",
restic.KeyFile: "keys",
}
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func (l *DefaultLayout) String() string {
return "<DefaultLayout>"
}
// Name returns the name for this layout.
func (l *DefaultLayout) Name() string {
return "default"
}
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// Dirname returns the directory path for a given file type and name.
func (l *DefaultLayout) Dirname(h restic.Handle) string {
p := defaultLayoutPaths[h.Type]
if h.Type == restic.DataFile && len(h.Name) > 2 {
p = l.Join(p, h.Name[:2]) + "/"
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}
return l.Join(l.Path, p) + "/"
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}
// Filename returns a path to a file, including its name.
func (l *DefaultLayout) Filename(h restic.Handle) string {
name := h.Name
if h.Type == restic.ConfigFile {
return l.Join(l.Path, "config")
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}
return l.Join(l.Dirname(h), name)
}
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// Paths returns all directory names needed for a repo.
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func (l *DefaultLayout) Paths() (dirs []string) {
for _, p := range defaultLayoutPaths {
dirs = append(dirs, l.Join(l.Path, p))
}
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// also add subdirs
for i := 0; i < 256; i++ {
subdir := hex.EncodeToString([]byte{byte(i)})
dirs = append(dirs, l.Join(l.Path, defaultLayoutPaths[restic.DataFile], subdir))
}
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return dirs
}
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// Basedir returns the base dir name for type t.
func (l *DefaultLayout) Basedir(t restic.FileType) string {
return l.Join(l.Path, defaultLayoutPaths[t])
}