restic/src/restic/fuse/dir.go

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// +build !openbsd
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// +build !windows
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package fuse
import (
"os"
"bazil.org/fuse"
"bazil.org/fuse/fs"
"golang.org/x/net/context"
"restic"
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"restic/debug"
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)
// Statically ensure that *dir implement those interface
var _ = fs.HandleReadDirAller(&dir{})
var _ = fs.NodeStringLookuper(&dir{})
type dir struct {
repo restic.Repository
items map[string]*restic.Node
inode uint64
node *restic.Node
ownerIsRoot bool
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}
func newDir(repo restic.Repository, node *restic.Node, ownerIsRoot bool) (*dir, error) {
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debug.Log("newDir", "new dir for %v (%v)", node.Name, node.Subtree.Str())
tree, err := repo.LoadTree(*node.Subtree)
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if err != nil {
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debug.Log("newDir", " error loading tree %v: %v", node.Subtree.Str(), err)
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return nil, err
}
items := make(map[string]*restic.Node)
for _, node := range tree.Nodes {
items[node.Name] = node
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}
return &dir{
repo: repo,
node: node,
items: items,
inode: node.Inode,
ownerIsRoot: ownerIsRoot,
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}, nil
}
// replaceSpecialNodes replaces nodes with name "." and "/" by their contents.
// Otherwise, the node is returned.
func replaceSpecialNodes(repo restic.Repository, node *restic.Node) ([]*restic.Node, error) {
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if node.Type != "dir" || node.Subtree == nil {
return []*restic.Node{node}, nil
}
if node.Name != "." && node.Name != "/" {
return []*restic.Node{node}, nil
}
tree, err := repo.LoadTree(*node.Subtree)
if err != nil {
return nil, err
}
return tree.Nodes, nil
}
func newDirFromSnapshot(repo restic.Repository, snapshot SnapshotWithId, ownerIsRoot bool) (*dir, error) {
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debug.Log("newDirFromSnapshot", "new dir for snapshot %v (%v)", snapshot.ID.Str(), snapshot.Tree.Str())
tree, err := repo.LoadTree(*snapshot.Tree)
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if err != nil {
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debug.Log("newDirFromSnapshot", " loadTree(%v) failed: %v", snapshot.ID.Str(), err)
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return nil, err
}
items := make(map[string]*restic.Node)
for _, n := range tree.Nodes {
nodes, err := replaceSpecialNodes(repo, n)
if err != nil {
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debug.Log("newDirFromSnapshot", " replaceSpecialNodes(%v) failed: %v", n, err)
return nil, err
}
for _, node := range nodes {
items[node.Name] = node
}
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}
return &dir{
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repo: repo,
node: &restic.Node{
UID: uint32(os.Getuid()),
GID: uint32(os.Getgid()),
AccessTime: snapshot.Time,
ModTime: snapshot.Time,
ChangeTime: snapshot.Time,
Mode: os.ModeDir | 0555,
},
items: items,
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inode: inodeFromBackendID(snapshot.ID),
ownerIsRoot: ownerIsRoot,
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}, nil
}
func (d *dir) Attr(ctx context.Context, a *fuse.Attr) error {
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debug.Log("dir.Attr", "called")
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a.Inode = d.inode
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a.Mode = os.ModeDir | d.node.Mode
if !d.ownerIsRoot {
a.Uid = d.node.UID
a.Gid = d.node.GID
}
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a.Atime = d.node.AccessTime
a.Ctime = d.node.ChangeTime
a.Mtime = d.node.ModTime
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return nil
}
func (d *dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
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debug.Log("dir.ReadDirAll", "called")
ret := make([]fuse.Dirent, 0, len(d.items))
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for _, node := range d.items {
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var typ fuse.DirentType
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switch node.Type {
case "dir":
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typ = fuse.DT_Dir
case "file":
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typ = fuse.DT_File
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case "symlink":
typ = fuse.DT_Link
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}
ret = append(ret, fuse.Dirent{
Inode: node.Inode,
Type: typ,
Name: node.Name,
})
}
return ret, nil
}
func (d *dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
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debug.Log("dir.Lookup", "Lookup(%v)", name)
node, ok := d.items[name]
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if !ok {
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debug.Log("dir.Lookup", " Lookup(%v) -> not found", name)
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return nil, fuse.ENOENT
}
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switch node.Type {
case "dir":
return newDir(d.repo, node, d.ownerIsRoot)
case "file":
return newFile(d.repo, node, d.ownerIsRoot)
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case "symlink":
return newLink(d.repo, node, d.ownerIsRoot)
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default:
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debug.Log("dir.Lookup", " node %v has unknown type %v", name, node.Type)
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return nil, fuse.ENOENT
}
}