restic/internal/fuse/fuse_test.go

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//go:build darwin || freebsd || linux
// +build darwin freebsd linux
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package fuse
import (
"bytes"
"context"
"math/rand"
"os"
"strings"
"testing"
"time"
"github.com/restic/restic/internal/bloblru"
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"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/restic"
"github.com/anacrolix/fuse"
"github.com/anacrolix/fuse/fs"
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rtest "github.com/restic/restic/internal/test"
)
func testRead(t testing.TB, f fs.Handle, offset, length int, data []byte) {
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ctx, cancel := context.WithCancel(context.Background())
defer cancel()
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req := &fuse.ReadRequest{
Offset: int64(offset),
Size: length,
}
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resp := &fuse.ReadResponse{
Data: data,
}
fr := f.(fs.HandleReader)
rtest.OK(t, fr.Read(ctx, req, resp))
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}
func firstSnapshotID(t testing.TB, repo restic.Lister) (first restic.ID) {
err := repo.List(context.TODO(), restic.SnapshotFile, func(id restic.ID, size int64) error {
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if first.IsNull() {
first = id
}
return nil
})
if err != nil {
t.Fatal(err)
}
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return first
}
func loadFirstSnapshot(t testing.TB, repo restic.ListerLoaderUnpacked) *restic.Snapshot {
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id := firstSnapshotID(t, repo)
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sn, err := restic.LoadSnapshot(context.TODO(), repo, id)
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rtest.OK(t, err)
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return sn
}
func loadTree(t testing.TB, repo restic.Loader, id restic.ID) *restic.Tree {
tree, err := restic.LoadTree(context.TODO(), repo, id)
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rtest.OK(t, err)
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return tree
}
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func TestFuseFile(t *testing.T) {
repo := repository.TestRepository(t)
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ctx, cancel := context.WithCancel(context.Background())
defer cancel()
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timestamp, err := time.Parse(time.RFC3339, "2017-01-24T10:42:56+01:00")
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rtest.OK(t, err)
restic.TestCreateSnapshot(t, repo, timestamp, 2)
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sn := loadFirstSnapshot(t, repo)
tree := loadTree(t, repo, *sn.Tree)
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var content restic.IDs
for _, node := range tree.Nodes {
content = append(content, node.Content...)
}
t.Logf("tree loaded, content: %v", content)
var (
filesize uint64
memfile []byte
)
for _, id := range content {
size, found := repo.LookupBlobSize(restic.DataBlob, id)
rtest.Assert(t, found, "Expected to find blob id %v", id)
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filesize += uint64(size)
buf, err := repo.LoadBlob(context.TODO(), restic.DataBlob, id, nil)
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rtest.OK(t, err)
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if len(buf) != int(size) {
t.Fatalf("not enough bytes read for id %v: want %v, got %v", id.Str(), size, len(buf))
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}
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if uint(len(buf)) != size {
t.Fatalf("buffer has wrong length for id %v: want %v, got %v", id.Str(), size, len(buf))
}
memfile = append(memfile, buf...)
}
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t.Logf("filesize is %v, memfile has size %v", filesize, len(memfile))
node := &restic.Node{
Name: "foo",
Inode: 23,
Mode: 0742,
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Size: filesize,
Content: content,
}
root := &Root{repo: repo, blobCache: bloblru.New(blobCacheSize)}
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inode := inodeFromNode(1, node)
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f, err := newFile(root, inode, node)
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rtest.OK(t, err)
of, err := f.Open(context.TODO(), nil, nil)
rtest.OK(t, err)
attr := fuse.Attr{}
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rtest.OK(t, f.Attr(ctx, &attr))
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rtest.Equals(t, inode, attr.Inode)
rtest.Equals(t, node.Mode, attr.Mode)
rtest.Equals(t, node.Size, attr.Size)
rtest.Equals(t, (node.Size/uint64(attr.BlockSize))+1, attr.Blocks)
for i := 0; i < 200; i++ {
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offset := rand.Intn(int(filesize))
length := rand.Intn(int(filesize)-offset) + 100
b := memfile[offset : offset+length]
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buf := make([]byte, length)
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testRead(t, of, offset, length, buf)
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if !bytes.Equal(b, buf) {
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t.Errorf("test %d failed, wrong data returned (offset %v, length %v)", i, offset, length)
}
}
}
func TestFuseDir(t *testing.T) {
repo := repository.TestRepository(t)
root := &Root{repo: repo, blobCache: bloblru.New(blobCacheSize)}
node := &restic.Node{
Mode: 0755,
UID: 42,
GID: 43,
AccessTime: time.Unix(1606773731, 0),
ChangeTime: time.Unix(1606773732, 0),
ModTime: time.Unix(1606773733, 0),
}
parentInode := inodeFromName(0, "parent")
inode := inodeFromName(1, "foo")
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d, err := newDir(root, inode, parentInode, node)
rtest.OK(t, err)
// don't open the directory as that would require setting up a proper tree blob
attr := fuse.Attr{}
rtest.OK(t, d.Attr(context.TODO(), &attr))
rtest.Equals(t, inode, attr.Inode)
rtest.Equals(t, node.UID, attr.Uid)
rtest.Equals(t, node.GID, attr.Gid)
rtest.Equals(t, node.AccessTime, attr.Atime)
rtest.Equals(t, node.ChangeTime, attr.Ctime)
rtest.Equals(t, node.ModTime, attr.Mtime)
}
// Test top-level directories for their UID and GID.
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func TestTopUIDGID(t *testing.T) {
repo := repository.TestRepository(t)
restic.TestCreateSnapshot(t, repo, time.Unix(1460289341, 207401672), 0)
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testTopUIDGID(t, Config{}, repo, uint32(os.Getuid()), uint32(os.Getgid()))
testTopUIDGID(t, Config{OwnerIsRoot: true}, repo, 0, 0)
}
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func testTopUIDGID(t *testing.T, cfg Config, repo restic.Repository, uid, gid uint32) {
t.Helper()
ctx := context.Background()
root := NewRoot(repo, cfg)
var attr fuse.Attr
err := root.Attr(ctx, &attr)
rtest.OK(t, err)
rtest.Equals(t, uid, attr.Uid)
rtest.Equals(t, gid, attr.Gid)
idsdir, err := root.Lookup(ctx, "ids")
rtest.OK(t, err)
err = idsdir.Attr(ctx, &attr)
rtest.OK(t, err)
rtest.Equals(t, uid, attr.Uid)
rtest.Equals(t, gid, attr.Gid)
snapID := loadFirstSnapshot(t, repo).ID().Str()
snapshotdir, err := idsdir.(fs.NodeStringLookuper).Lookup(ctx, snapID)
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rtest.OK(t, err)
// restic.TestCreateSnapshot does not set the UID/GID thus it must be always zero
err = snapshotdir.Attr(ctx, &attr)
rtest.OK(t, err)
rtest.Equals(t, uint32(0), attr.Uid)
rtest.Equals(t, uint32(0), attr.Gid)
}
// Test reporting of fuse.Attr.Blocks in multiples of 512.
func TestBlocks(t *testing.T) {
root := &Root{}
for _, c := range []struct {
size, blocks uint64
}{
{0, 0},
{1, 1},
{511, 1},
{512, 1},
{513, 2},
{1024, 2},
{1025, 3},
{41253, 81},
} {
target := strings.Repeat("x", int(c.size))
for _, n := range []fs.Node{
&file{root: root, node: &restic.Node{Size: uint64(c.size)}},
&link{root: root, node: &restic.Node{LinkTarget: target}},
&snapshotLink{root: root, snapshot: &restic.Snapshot{}, target: target},
} {
var a fuse.Attr
err := n.Attr(context.TODO(), &a)
rtest.OK(t, err)
rtest.Equals(t, c.blocks, a.Blocks)
}
}
}
func TestInodeFromNode(t *testing.T) {
node := &restic.Node{Name: "foo.txt", Type: "chardev", Links: 2}
ino1 := inodeFromNode(1, node)
ino2 := inodeFromNode(2, node)
rtest.Assert(t, ino1 == ino2, "inodes %d, %d of hard links differ", ino1, ino2)
node.Links = 1
ino1 = inodeFromNode(1, node)
ino2 = inodeFromNode(2, node)
rtest.Assert(t, ino1 != ino2, "same inode %d but different parent", ino1)
// Regression test: in a path a/b/b, the grandchild should not get the
// same inode as the grandparent.
a := &restic.Node{Name: "a", Type: "dir", Links: 2}
ab := &restic.Node{Name: "b", Type: "dir", Links: 2}
abb := &restic.Node{Name: "b", Type: "dir", Links: 2}
inoA := inodeFromNode(1, a)
inoAb := inodeFromNode(inoA, ab)
inoAbb := inodeFromNode(inoAb, abb)
rtest.Assert(t, inoA != inoAb, "inode(a/b) = inode(a)")
rtest.Assert(t, inoA != inoAbb, "inode(a/b/b) = inode(a)")
}
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func TestLink(t *testing.T) {
node := &restic.Node{Name: "foo.txt", Type: "symlink", Links: 1, LinkTarget: "dst", ExtendedAttributes: []restic.ExtendedAttribute{
{Name: "foo", Value: []byte("bar")},
}}
lnk, err := newLink(&Root{}, 42, node)
rtest.OK(t, err)
target, err := lnk.Readlink(context.TODO(), nil)
rtest.OK(t, err)
rtest.Equals(t, node.LinkTarget, target)
exp := &fuse.ListxattrResponse{}
exp.Append("foo")
resp := &fuse.ListxattrResponse{}
rtest.OK(t, lnk.Listxattr(context.TODO(), &fuse.ListxattrRequest{}, resp))
rtest.Equals(t, exp.Xattr, resp.Xattr)
getResp := &fuse.GetxattrResponse{}
rtest.OK(t, lnk.Getxattr(context.TODO(), &fuse.GetxattrRequest{Name: "foo"}, getResp))
rtest.Equals(t, node.ExtendedAttributes[0].Value, getResp.Xattr)
err = lnk.Getxattr(context.TODO(), &fuse.GetxattrRequest{Name: "invalid"}, nil)
rtest.Assert(t, err != nil, "missing error on reading invalid xattr")
}
var sink uint64
func BenchmarkInode(b *testing.B) {
for _, sub := range []struct {
name string
node restic.Node
}{
{
name: "no_hard_links",
node: restic.Node{Name: "a somewhat long-ish filename.svg.bz2", Type: "fifo"},
},
{
name: "hard_link",
node: restic.Node{Name: "some other filename", Type: "file", Links: 2},
},
} {
b.Run(sub.name, func(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
sink = inodeFromNode(1, &sub.node)
}
})
}
}