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5cdcc99eba
Since backend.ID is always a slice of constant length, use an array
instead of a slice. Mostly, arrays behave as slices, except that an
array cannot be nil, so use `*backend.ID` insteaf of `backend.ID` in
places where the absence of an ID is possible (e.g. for the Subtree of a
Node, which may not present when the node is a file node).
This change allows to directly use backend.ID as the the key for a map,
so that arbitrary data structures (e.g. a Set implemented as a
map[backend.ID]struct{}) can easily be formed.
105 lines
2.1 KiB
Go
105 lines
2.1 KiB
Go
package restic
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import (
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"fmt"
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"os"
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"os/user"
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"path/filepath"
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"strconv"
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"time"
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"github.com/restic/restic/backend"
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"github.com/restic/restic/repository"
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)
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type Snapshot struct {
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Time time.Time `json:"time"`
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Parent *backend.ID `json:"parent,omitempty"`
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Tree *backend.ID `json:"tree"`
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Paths []string `json:"paths"`
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Hostname string `json:"hostname,omitempty"`
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Username string `json:"username,omitempty"`
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UID uint32 `json:"uid,omitempty"`
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GID uint32 `json:"gid,omitempty"`
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Excludes []string `json:"excludes,omitempty"`
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id *backend.ID // plaintext ID, used during restore
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}
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func NewSnapshot(paths []string) (*Snapshot, error) {
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for i, path := range paths {
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if p, err := filepath.Abs(path); err != nil {
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paths[i] = p
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}
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}
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sn := &Snapshot{
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Paths: paths,
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Time: time.Now(),
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}
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hn, err := os.Hostname()
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if err == nil {
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sn.Hostname = hn
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}
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err = sn.fillUserInfo()
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if err != nil {
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return nil, err
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}
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return sn, nil
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}
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func LoadSnapshot(repo *repository.Repository, id backend.ID) (*Snapshot, error) {
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sn := &Snapshot{id: &id}
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err := repo.LoadJSONUnpacked(backend.Snapshot, id, sn)
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if err != nil {
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return nil, err
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}
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return sn, nil
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}
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func (sn Snapshot) String() string {
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return fmt.Sprintf("<Snapshot of %v at %s>", sn.Paths, sn.Time)
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}
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func (sn Snapshot) ID() *backend.ID {
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return sn.id
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}
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func (sn *Snapshot) fillUserInfo() error {
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usr, err := user.Current()
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if err != nil {
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return nil
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}
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sn.Username = usr.Username
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uid, err := strconv.ParseInt(usr.Uid, 10, 32)
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if err != nil {
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return err
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}
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sn.UID = uint32(uid)
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gid, err := strconv.ParseInt(usr.Gid, 10, 32)
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if err != nil {
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return err
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}
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sn.GID = uint32(gid)
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return nil
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}
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// FindSnapshot takes a string and tries to find a snapshot whose ID matches
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// the string as closely as possible.
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func FindSnapshot(repo *repository.Repository, s string) (backend.ID, error) {
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// find snapshot id with prefix
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name, err := backend.Find(repo.Backend(), backend.Snapshot, s)
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if err != nil {
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return backend.ID{}, err
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}
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return backend.ParseID(name)
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}
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