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restic/internal/fuse/snapshots_dir.go
MichaelEischer f77477129f
Merge pull request #2584 from greatroar/mount-cache-uid-gid
Cache uid and gid for top directories in internal/fuse
2020-04-18 17:45:14 +02:00

543 lines
12 KiB
Go

// +build !netbsd
// +build !openbsd
// +build !solaris
// +build !windows
package fuse
import (
"fmt"
"os"
"time"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/restic"
"golang.org/x/net/context"
"bazil.org/fuse"
"bazil.org/fuse/fs"
)
// SnapshotsDir is a fuse directory which contains snapshots named by timestamp.
type SnapshotsDir struct {
inode uint64
root *Root
names map[string]*restic.Snapshot
latest string
tag string
host string
snCount int
template string
}
// SnapshotsIDSDir is a fuse directory which contains snapshots named by ids.
type SnapshotsIDSDir struct {
inode uint64
root *Root
names map[string]*restic.Snapshot
snCount int
}
// HostsDir is a fuse directory which contains hosts.
type HostsDir struct {
inode uint64
root *Root
hosts map[string]bool
snCount int
}
// TagsDir is a fuse directory which contains tags.
type TagsDir struct {
inode uint64
root *Root
tags map[string]bool
snCount int
}
// SnapshotLink
type snapshotLink struct {
root *Root
inode uint64
target string
snapshot *restic.Snapshot
}
// ensure that *SnapshotsDir implements these interfaces
var _ = fs.HandleReadDirAller(&SnapshotsDir{})
var _ = fs.NodeStringLookuper(&SnapshotsDir{})
var _ = fs.HandleReadDirAller(&SnapshotsIDSDir{})
var _ = fs.NodeStringLookuper(&SnapshotsIDSDir{})
var _ = fs.HandleReadDirAller(&TagsDir{})
var _ = fs.NodeStringLookuper(&TagsDir{})
var _ = fs.HandleReadDirAller(&HostsDir{})
var _ = fs.NodeStringLookuper(&HostsDir{})
var _ = fs.NodeReadlinker(&snapshotLink{})
// read tag names from the current repository-state.
func updateTagNames(d *TagsDir) {
if d.snCount != d.root.snCount {
d.snCount = d.root.snCount
d.tags = make(map[string]bool, len(d.root.snapshots))
for _, snapshot := range d.root.snapshots {
for _, tag := range snapshot.Tags {
if tag != "" {
d.tags[tag] = true
}
}
}
}
}
// read host names from the current repository-state.
func updateHostsNames(d *HostsDir) {
if d.snCount != d.root.snCount {
d.snCount = d.root.snCount
d.hosts = make(map[string]bool, len(d.root.snapshots))
for _, snapshot := range d.root.snapshots {
d.hosts[snapshot.Hostname] = true
}
}
}
// read snapshot id names from the current repository-state.
func updateSnapshotIDSNames(d *SnapshotsIDSDir) {
if d.snCount != d.root.snCount {
d.snCount = d.root.snCount
for _, sn := range d.root.snapshots {
name := sn.ID().Str()
d.names[name] = sn
}
}
}
// NewSnapshotsDir returns a new directory containing snapshots.
func NewSnapshotsDir(root *Root, inode uint64, tag string, host string) *SnapshotsDir {
debug.Log("create snapshots dir, inode %d", inode)
d := &SnapshotsDir{
root: root,
inode: inode,
names: make(map[string]*restic.Snapshot),
latest: "",
tag: tag,
host: host,
template: root.cfg.SnapshotTemplate,
}
return d
}
// NewSnapshotsIDSDir returns a new directory containing snapshots named by ids.
func NewSnapshotsIDSDir(root *Root, inode uint64) *SnapshotsIDSDir {
debug.Log("create snapshots ids dir, inode %d", inode)
d := &SnapshotsIDSDir{
root: root,
inode: inode,
names: make(map[string]*restic.Snapshot),
}
return d
}
// NewHostsDir returns a new directory containing host names
func NewHostsDir(root *Root, inode uint64) *HostsDir {
debug.Log("create hosts dir, inode %d", inode)
d := &HostsDir{
root: root,
inode: inode,
hosts: make(map[string]bool),
}
return d
}
// NewTagsDir returns a new directory containing tag names
func NewTagsDir(root *Root, inode uint64) *TagsDir {
debug.Log("create tags dir, inode %d", inode)
d := &TagsDir{
root: root,
inode: inode,
tags: make(map[string]bool),
}
return d
}
// Attr returns the attributes for the root node.
func (d *SnapshotsDir) Attr(ctx context.Context, attr *fuse.Attr) error {
attr.Inode = d.inode
attr.Mode = os.ModeDir | 0555
attr.Uid = d.root.uid
attr.Gid = d.root.gid
debug.Log("attr: %v", attr)
return nil
}
// Attr returns the attributes for the SnapshotsDir.
func (d *SnapshotsIDSDir) Attr(ctx context.Context, attr *fuse.Attr) error {
attr.Inode = d.inode
attr.Mode = os.ModeDir | 0555
attr.Uid = d.root.uid
attr.Gid = d.root.gid
debug.Log("attr: %v", attr)
return nil
}
// Attr returns the attributes for the HostsDir.
func (d *HostsDir) Attr(ctx context.Context, attr *fuse.Attr) error {
attr.Inode = d.inode
attr.Mode = os.ModeDir | 0555
attr.Uid = d.root.uid
attr.Gid = d.root.gid
debug.Log("attr: %v", attr)
return nil
}
// Attr returns the attributes for the TagsDir.
func (d *TagsDir) Attr(ctx context.Context, attr *fuse.Attr) error {
attr.Inode = d.inode
attr.Mode = os.ModeDir | 0555
attr.Uid = d.root.uid
attr.Gid = d.root.gid
debug.Log("attr: %v", attr)
return nil
}
// search element in string list.
func isElem(e string, list []string) bool {
for _, x := range list {
if e == x {
return true
}
}
return false
}
const minSnapshotsReloadTime = 60 * time.Second
// update snapshots if repository has changed
func updateSnapshots(ctx context.Context, root *Root) error {
if time.Since(root.lastCheck) < minSnapshotsReloadTime {
return nil
}
snapshots, err := restic.FindFilteredSnapshots(ctx, root.repo, root.cfg.Hosts, root.cfg.Tags, root.cfg.Paths)
if err != nil {
return err
}
if root.snCount != len(snapshots) {
root.snCount = len(snapshots)
root.repo.LoadIndex(ctx)
root.snapshots = snapshots
}
root.lastCheck = time.Now()
return nil
}
// read snapshot timestamps from the current repository-state.
func updateSnapshotNames(d *SnapshotsDir, template string) {
if d.snCount != d.root.snCount {
d.snCount = d.root.snCount
var latestTime time.Time
d.latest = ""
d.names = make(map[string]*restic.Snapshot, len(d.root.snapshots))
for _, sn := range d.root.snapshots {
if d.tag == "" || isElem(d.tag, sn.Tags) {
if d.host == "" || d.host == sn.Hostname {
name := sn.Time.Format(template)
if d.latest == "" || !sn.Time.Before(latestTime) {
latestTime = sn.Time
d.latest = name
}
for i := 1; ; i++ {
if _, ok := d.names[name]; !ok {
break
}
name = fmt.Sprintf("%s-%d", sn.Time.Format(template), i)
}
d.names[name] = sn
}
}
}
}
}
// ReadDirAll returns all entries of the SnapshotsDir.
func (d *SnapshotsDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
debug.Log("ReadDirAll()")
// update snapshots
updateSnapshots(ctx, d.root)
// update snapshot names
updateSnapshotNames(d, d.root.cfg.SnapshotTemplate)
items := []fuse.Dirent{
{
Inode: d.inode,
Name: ".",
Type: fuse.DT_Dir,
},
{
Inode: d.root.inode,
Name: "..",
Type: fuse.DT_Dir,
},
}
for name := range d.names {
items = append(items, fuse.Dirent{
Inode: fs.GenerateDynamicInode(d.inode, name),
Name: name,
Type: fuse.DT_Dir,
})
}
// Latest
if d.latest != "" {
items = append(items, fuse.Dirent{
Inode: fs.GenerateDynamicInode(d.inode, "latest"),
Name: "latest",
Type: fuse.DT_Link,
})
}
return items, nil
}
// ReadDirAll returns all entries of the SnapshotsIDSDir.
func (d *SnapshotsIDSDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
debug.Log("ReadDirAll()")
// update snapshots
updateSnapshots(ctx, d.root)
// update snapshot ids
updateSnapshotIDSNames(d)
items := []fuse.Dirent{
{
Inode: d.inode,
Name: ".",
Type: fuse.DT_Dir,
},
{
Inode: d.root.inode,
Name: "..",
Type: fuse.DT_Dir,
},
}
for name := range d.names {
items = append(items, fuse.Dirent{
Inode: fs.GenerateDynamicInode(d.inode, name),
Name: name,
Type: fuse.DT_Dir,
})
}
return items, nil
}
// ReadDirAll returns all entries of the HostsDir.
func (d *HostsDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
debug.Log("ReadDirAll()")
// update snapshots
updateSnapshots(ctx, d.root)
// update host names
updateHostsNames(d)
items := []fuse.Dirent{
{
Inode: d.inode,
Name: ".",
Type: fuse.DT_Dir,
},
{
Inode: d.root.inode,
Name: "..",
Type: fuse.DT_Dir,
},
}
for host := range d.hosts {
items = append(items, fuse.Dirent{
Inode: fs.GenerateDynamicInode(d.inode, host),
Name: host,
Type: fuse.DT_Dir,
})
}
return items, nil
}
// ReadDirAll returns all entries of the TagsDir.
func (d *TagsDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
debug.Log("ReadDirAll()")
// update snapshots
updateSnapshots(ctx, d.root)
// update tag names
updateTagNames(d)
items := []fuse.Dirent{
{
Inode: d.inode,
Name: ".",
Type: fuse.DT_Dir,
},
{
Inode: d.root.inode,
Name: "..",
Type: fuse.DT_Dir,
},
}
for tag := range d.tags {
items = append(items, fuse.Dirent{
Inode: fs.GenerateDynamicInode(d.inode, tag),
Name: tag,
Type: fuse.DT_Dir,
})
}
return items, nil
}
// newSnapshotLink
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
}
// Readlink
func (l *snapshotLink) Readlink(ctx context.Context, req *fuse.ReadlinkRequest) (string, error) {
return l.target, nil
}
// Attr
func (l *snapshotLink) Attr(ctx context.Context, a *fuse.Attr) error {
a.Inode = l.inode
a.Mode = os.ModeSymlink | 0777
a.Uid = l.root.uid
a.Gid = l.root.gid
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 SnapshotsDir.
func (d *SnapshotsDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
debug.Log("Lookup(%s)", name)
sn, ok := d.names[name]
if !ok {
// could not find entry. Updating repository-state
updateSnapshots(ctx, d.root)
// update snapshot names
updateSnapshotNames(d, d.root.cfg.SnapshotTemplate)
sn, ok := d.names[name]
if ok {
return newDirFromSnapshot(ctx, d.root, fs.GenerateDynamicInode(d.inode, name), sn)
}
if name == "latest" && d.latest != "" {
sn, ok := d.names[d.latest]
// internal error
if !ok {
return nil, fuse.ENOENT
}
return newSnapshotLink(ctx, d.root, fs.GenerateDynamicInode(d.inode, name), d.latest, sn)
}
return nil, fuse.ENOENT
}
return newDirFromSnapshot(ctx, d.root, fs.GenerateDynamicInode(d.inode, name), sn)
}
// Lookup returns a specific entry from the SnapshotsIDSDir.
func (d *SnapshotsIDSDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
debug.Log("Lookup(%s)", name)
sn, ok := d.names[name]
if !ok {
// could not find entry. Updating repository-state
updateSnapshots(ctx, d.root)
// update snapshot ids
updateSnapshotIDSNames(d)
sn, ok := d.names[name]
if ok {
return newDirFromSnapshot(ctx, d.root, fs.GenerateDynamicInode(d.inode, name), sn)
}
return nil, fuse.ENOENT
}
return newDirFromSnapshot(ctx, d.root, fs.GenerateDynamicInode(d.inode, name), sn)
}
// Lookup returns a specific entry from the HostsDir.
func (d *HostsDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
debug.Log("Lookup(%s)", name)
_, ok := d.hosts[name]
if !ok {
// could not find entry. Updating repository-state
updateSnapshots(ctx, d.root)
// update host names
updateHostsNames(d)
_, ok := d.hosts[name]
if ok {
return NewSnapshotsDir(d.root, fs.GenerateDynamicInode(d.root.inode, name), "", name), nil
}
return nil, fuse.ENOENT
}
return NewSnapshotsDir(d.root, fs.GenerateDynamicInode(d.root.inode, name), "", name), nil
}
// Lookup returns a specific entry from the TagsDir.
func (d *TagsDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
debug.Log("Lookup(%s)", name)
_, ok := d.tags[name]
if !ok {
// could not find entry. Updating repository-state
updateSnapshots(ctx, d.root)
// update tag names
updateTagNames(d)
_, ok := d.tags[name]
if ok {
return NewSnapshotsDir(d.root, fs.GenerateDynamicInode(d.root.inode, name), name, ""), nil
}
return nil, fuse.ENOENT
}
return NewSnapshotsDir(d.root, fs.GenerateDynamicInode(d.root.inode, name), name, ""), nil
}