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package layout
import (
"encoding/hex"
"github.com/restic/restic/internal/backend"
)
// 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[backend.FileType]string{
backend.PackFile: "data",
backend.SnapshotFile: "snapshots",
backend.IndexFile: "index",
backend.LockFile: "locks",
backend.KeyFile: "keys",
}
func NewDefaultLayout(path string, join func(...string) string) *DefaultLayout {
return &DefaultLayout{
path: path,
join: join,
}
}
func (l *DefaultLayout) String() string {
return "<DefaultLayout>"
}
// Name returns the name for this layout.
func (l *DefaultLayout) Name() string {
return "default"
}
// Dirname returns the directory path for a given file type and name.
func (l *DefaultLayout) Dirname(h backend.Handle) string {
p := defaultLayoutPaths[h.Type]
if h.Type == backend.PackFile && len(h.Name) > 2 {
p = l.join(p, h.Name[:2]) + "/"
}
return l.join(l.path, p) + "/"
}
// Filename returns a path to a file, including its name.
func (l *DefaultLayout) Filename(h backend.Handle) string {
name := h.Name
if h.Type == backend.ConfigFile {
return l.join(l.path, "config")
}
return l.join(l.Dirname(h), name)
}
// Paths returns all directory names needed for a repo.
func (l *DefaultLayout) Paths() (dirs []string) {
for _, p := range defaultLayoutPaths {
dirs = append(dirs, l.join(l.path, p))
}
// also add subdirs
for i := 0; i < 256; i++ {
subdir := hex.EncodeToString([]byte{byte(i)})
dirs = append(dirs, l.join(l.path, defaultLayoutPaths[backend.PackFile], subdir))
}
return dirs
}
// Basedir returns the base dir name for type t.
func (l *DefaultLayout) Basedir(t backend.FileType) (dirname string, subdirs bool) {
if t == backend.PackFile {
subdirs = true
}
dirname = l.join(l.path, defaultLayoutPaths[t])
return
}
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