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Merge pull request #1249 from mungomat/fuse_symlink

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fuse: added symlink 'latest' to snapshots-dir
This commit is contained in:
Alexander Neumann 2017-09-21 20:33:10 +02:00
commit ac5eefdee4
2 changed files with 78 additions and 8 deletions
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26
cmd/restic/integration_fuse_test.go
View File

@ -82,7 +82,7 @@ func listSnapshots(t testing.TB, dir string) []string {
return names
}
func checkSnapshots(t testing.TB, global GlobalOptions, repo *repository.Repository, mountpoint, repodir string, snapshotIDs restic.IDs) {
func checkSnapshots(t testing.TB, global GlobalOptions, repo *repository.Repository, mountpoint, repodir string, snapshotIDs restic.IDs, expectedSnapshotsInFuseDir int) {
t.Logf("checking for %d snapshots: %v", len(snapshotIDs), snapshotIDs)
go testRunMount(t, global, mountpoint)
@ -99,14 +99,24 @@ func checkSnapshots(t testing.TB, global GlobalOptions, repo *repository.Reposit
namesInSnapshots := listSnapshots(t, mountpoint)
t.Logf("found %v snapshots in fuse mount: %v", len(namesInSnapshots), namesInSnapshots)
Assert(t,
len(namesInSnapshots) == len(snapshotIDs),
"Invalid number of snapshots: expected %d, got %d", len(snapshotIDs), len(namesInSnapshots))
expectedSnapshotsInFuseDir == len(namesInSnapshots),
"Invalid number of snapshots: expected %d, got %d", expectedSnapshotsInFuseDir, len(namesInSnapshots))
namesMap := make(map[string]bool)
for _, name := range namesInSnapshots {
namesMap[name] = false
}
// Is "latest" present?
if len(namesMap) != 0 {
_, ok := namesMap["latest"]
if !ok {
t.Errorf("Symlink latest isn't present in fuse dir")
} else {
namesMap["latest"] = true
}
}
for _, id := range snapshotIDs {
snapshot, err := restic.LoadSnapshot(context.TODO(), repo, id)
OK(t, err)
@ -153,7 +163,7 @@ func TestMount(t *testing.T) {
// We remove the mountpoint now to check that cmdMount creates it
RemoveAll(t, env.mountpoint)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, []restic.ID{})
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, []restic.ID{}, 0)
SetupTarTestFixture(t, env.testdata, filepath.Join("testdata", "backup-data.tar.gz"))
@ -163,7 +173,7 @@ func TestMount(t *testing.T) {
Assert(t, len(snapshotIDs) == 1,
"expected one snapshot, got %v", snapshotIDs)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, snapshotIDs)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, snapshotIDs, 2)
// second backup, implicit incremental
testRunBackup(t, []string{env.testdata}, BackupOptions{}, env.gopts)
@ -171,7 +181,7 @@ func TestMount(t *testing.T) {
Assert(t, len(snapshotIDs) == 2,
"expected two snapshots, got %v", snapshotIDs)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, snapshotIDs)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, snapshotIDs, 3)
// third backup, explicit incremental
bopts := BackupOptions{Parent: snapshotIDs[0].String()}
@ -180,7 +190,7 @@ func TestMount(t *testing.T) {
Assert(t, len(snapshotIDs) == 3,
"expected three snapshots, got %v", snapshotIDs)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, snapshotIDs)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, snapshotIDs, 4)
}
func TestMountSameTimestamps(t *testing.T) {
@ -202,5 +212,5 @@ func TestMountSameTimestamps(t *testing.T) {
restic.TestParseID("5fd0d8b2ef0fa5d23e58f1e460188abb0f525c0f0c4af8365a1280c807a80a1b"),
}
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, ids)
checkSnapshots(t, env.gopts, repo, env.mountpoint, env.repo, ids, 4)
}

60
internal/fuse/snapshots_dir.go
View File

@ -23,11 +23,13 @@ type SnapshotsDir struct {
root *Root
snapshots restic.Snapshots
names map[string]*restic.Snapshot
latest string
}
// ensure that *SnapshotsDir implements these interfaces
var _ = fs.HandleReadDirAller(&SnapshotsDir{})
var _ = fs.NodeStringLookuper(&SnapshotsDir{})
var _ = fs.NodeReadlinker(&snapshotLink{})
// NewSnapshotsDir returns a new directory containing snapshots.
func NewSnapshotsDir(root *Root, inode uint64, snapshots restic.Snapshots) *SnapshotsDir {
@ -39,8 +41,16 @@ func NewSnapshotsDir(root *Root, inode uint64, snapshots restic.Snapshots) *Snap
names: make(map[string]*restic.Snapshot, len(snapshots)),
}
// Track latest Snapshot
var latestTime time.Time
d.latest = ""
for _, sn := range snapshots {
name := sn.Time.Format(time.RFC3339)
if d.latest == "" || !sn.Time.Before(latestTime) {
latestTime = sn.Time
d.latest = name
}
for i := 1; ; i++ {
if _, ok := d.names[name]; !ok {
break
@ -93,15 +103,65 @@ func (d *SnapshotsDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
})
}
// Latest
if d.latest != "" {
items = append(items, fuse.Dirent{
Inode: fs.GenerateDynamicInode(d.inode, "latest"),
Name: "latest",
Type: fuse.DT_Link,
})
}
return items, nil
}
type snapshotLink struct {
root *Root
inode uint64
target string
snapshot *restic.Snapshot
}
func newSnapshotLink(ctx context.Context, root *Root, inode uint64, target string, snapshot *restic.Snapshot) (*snapshotLink, error) {
return &snapshotLink{root: root, inode: inode, target: target, snapshot: snapshot}, nil
}
func (l *snapshotLink) Readlink(ctx context.Context, req *fuse.ReadlinkRequest) (string, error) {
return l.target, nil
}
func (l *snapshotLink) Attr(ctx context.Context, a *fuse.Attr) error {
a.Inode = l.inode
a.Mode = os.ModeSymlink | 0777
if !l.root.cfg.OwnerIsRoot {
a.Uid = uint32(os.Getuid())
a.Gid = uint32(os.Getgid())
}
a.Atime = l.snapshot.Time
a.Ctime = l.snapshot.Time
a.Mtime = l.snapshot.Time
a.Nlink = 1
return nil
}
// Lookup returns a specific entry from the root node.
func (d *SnapshotsDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
debug.Log("Lookup(%s)", name)
sn, ok := d.names[name]
if !ok {
if name == "latest" && d.latest != "" {
sn2, ok2 := d.names[d.latest]
// internal error
if !ok2 {
return nil, fuse.ENOENT
}
return newSnapshotLink(ctx, d.root, fs.GenerateDynamicInode(d.inode, name), d.latest, sn2)
}
return nil, fuse.ENOENT
}