forked from TrueCloudLab/restic
877 lines
21 KiB
Go
877 lines
21 KiB
Go
package restorer
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import (
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"bytes"
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"context"
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"io"
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"math"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"testing"
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"time"
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"github.com/restic/restic/internal/archiver"
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"github.com/restic/restic/internal/fs"
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"github.com/restic/restic/internal/repository"
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"github.com/restic/restic/internal/restic"
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rtest "github.com/restic/restic/internal/test"
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"golang.org/x/sync/errgroup"
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)
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type Node interface{}
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type Snapshot struct {
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Nodes map[string]Node
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}
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type File struct {
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Data string
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Links uint64
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Inode uint64
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Mode os.FileMode
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ModTime time.Time
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}
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type Dir struct {
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Nodes map[string]Node
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Mode os.FileMode
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ModTime time.Time
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}
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func saveFile(t testing.TB, repo restic.Repository, node File) restic.ID {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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id, _, _, err := repo.SaveBlob(ctx, restic.DataBlob, []byte(node.Data), restic.ID{}, false)
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if err != nil {
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t.Fatal(err)
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}
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return id
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}
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func saveDir(t testing.TB, repo restic.Repository, nodes map[string]Node, inode uint64) restic.ID {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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tree := &restic.Tree{}
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for name, n := range nodes {
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inode++
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switch node := n.(type) {
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case File:
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fi := n.(File).Inode
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if fi == 0 {
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fi = inode
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}
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lc := n.(File).Links
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if lc == 0 {
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lc = 1
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}
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fc := []restic.ID{}
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if len(n.(File).Data) > 0 {
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fc = append(fc, saveFile(t, repo, node))
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}
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mode := node.Mode
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if mode == 0 {
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mode = 0644
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}
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err := tree.Insert(&restic.Node{
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Type: "file",
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Mode: mode,
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ModTime: node.ModTime,
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Name: name,
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UID: uint32(os.Getuid()),
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GID: uint32(os.Getgid()),
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Content: fc,
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Size: uint64(len(n.(File).Data)),
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Inode: fi,
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Links: lc,
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})
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rtest.OK(t, err)
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case Dir:
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id := saveDir(t, repo, node.Nodes, inode)
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mode := node.Mode
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if mode == 0 {
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mode = 0755
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}
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err := tree.Insert(&restic.Node{
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Type: "dir",
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Mode: mode,
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ModTime: node.ModTime,
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Name: name,
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UID: uint32(os.Getuid()),
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GID: uint32(os.Getgid()),
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Subtree: &id,
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})
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rtest.OK(t, err)
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default:
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t.Fatalf("unknown node type %T", node)
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}
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}
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id, err := restic.SaveTree(ctx, repo, tree)
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if err != nil {
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t.Fatal(err)
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}
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return id
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}
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func saveSnapshot(t testing.TB, repo restic.Repository, snapshot Snapshot) (*restic.Snapshot, restic.ID) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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wg, wgCtx := errgroup.WithContext(ctx)
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repo.StartPackUploader(wgCtx, wg)
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treeID := saveDir(t, repo, snapshot.Nodes, 1000)
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err := repo.Flush(ctx)
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if err != nil {
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t.Fatal(err)
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}
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sn, err := restic.NewSnapshot([]string{"test"}, nil, "", time.Now())
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if err != nil {
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t.Fatal(err)
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}
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sn.Tree = &treeID
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id, err := restic.SaveSnapshot(ctx, repo, sn)
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if err != nil {
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t.Fatal(err)
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}
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return sn, id
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}
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func TestRestorer(t *testing.T) {
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var tests = []struct {
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Snapshot
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Files map[string]string
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ErrorsMust map[string]map[string]struct{}
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ErrorsMay map[string]map[string]struct{}
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Select func(item string, dstpath string, node *restic.Node) (selectForRestore bool, childMayBeSelected bool)
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}{
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// valid test cases
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"foo": File{Data: "content: foo\n"},
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"dirtest": Dir{
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Nodes: map[string]Node{
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"file": File{Data: "content: file\n"},
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},
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},
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},
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},
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Files: map[string]string{
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"foo": "content: foo\n",
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"dirtest/file": "content: file\n",
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},
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},
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"top": File{Data: "toplevel file"},
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"dir": Dir{
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Nodes: map[string]Node{
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"file": File{Data: "file in dir"},
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"subdir": Dir{
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Nodes: map[string]Node{
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"file": File{Data: "file in subdir"},
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},
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},
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},
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},
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},
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},
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Files: map[string]string{
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"top": "toplevel file",
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"dir/file": "file in dir",
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"dir/subdir/file": "file in subdir",
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},
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},
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"dir": Dir{
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Mode: 0444,
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},
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"file": File{Data: "top-level file"},
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},
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},
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Files: map[string]string{
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"file": "top-level file",
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},
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},
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"dir": Dir{
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Mode: 0555,
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Nodes: map[string]Node{
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"file": File{Data: "file in dir"},
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},
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},
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},
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},
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Files: map[string]string{
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"dir/file": "file in dir",
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},
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},
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"topfile": File{Data: "top-level file"},
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},
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},
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Files: map[string]string{
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"topfile": "top-level file",
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},
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},
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"dir": Dir{
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Nodes: map[string]Node{
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"file": File{Data: "content: file\n"},
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},
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},
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},
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},
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Files: map[string]string{
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"dir/file": "content: file\n",
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},
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Select: func(item, dstpath string, node *restic.Node) (selectedForRestore bool, childMayBeSelected bool) {
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switch item {
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case filepath.FromSlash("/dir"):
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childMayBeSelected = true
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case filepath.FromSlash("/dir/file"):
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selectedForRestore = true
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childMayBeSelected = true
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}
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return selectedForRestore, childMayBeSelected
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},
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},
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// test cases with invalid/constructed names
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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`..\test`: File{Data: "foo\n"},
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`..\..\foo\..\bar\..\xx\test2`: File{Data: "test2\n"},
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},
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},
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ErrorsMay: map[string]map[string]struct{}{
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`/`: {
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`invalid child node name ..\test`: struct{}{},
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`invalid child node name ..\..\foo\..\bar\..\xx\test2`: struct{}{},
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},
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},
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},
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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`../test`: File{Data: "foo\n"},
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`../../foo/../bar/../xx/test2`: File{Data: "test2\n"},
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},
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},
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ErrorsMay: map[string]map[string]struct{}{
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`/`: {
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`invalid child node name ../test`: struct{}{},
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`invalid child node name ../../foo/../bar/../xx/test2`: struct{}{},
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},
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},
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},
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"top": File{Data: "toplevel file"},
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"x": Dir{
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Nodes: map[string]Node{
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"file1": File{Data: "file1"},
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"..": Dir{
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Nodes: map[string]Node{
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"file2": File{Data: "file2"},
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"..": Dir{
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Nodes: map[string]Node{
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"file2": File{Data: "file2"},
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},
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},
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},
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},
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},
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},
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},
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},
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Files: map[string]string{
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"top": "toplevel file",
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},
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ErrorsMust: map[string]map[string]struct{}{
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`/x`: {
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`invalid child node name ..`: struct{}{},
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},
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},
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},
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}
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for _, test := range tests {
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t.Run("", func(t *testing.T) {
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repo := repository.TestRepository(t)
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sn, id := saveSnapshot(t, repo, test.Snapshot)
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t.Logf("snapshot saved as %v", id.Str())
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res := NewRestorer(repo, sn, false, nil)
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tempdir := rtest.TempDir(t)
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// make sure we're creating a new subdir of the tempdir
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tempdir = filepath.Join(tempdir, "target")
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res.SelectFilter = func(item, dstpath string, node *restic.Node) (selectedForRestore bool, childMayBeSelected bool) {
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t.Logf("restore %v to %v", item, dstpath)
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if !fs.HasPathPrefix(tempdir, dstpath) {
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t.Errorf("would restore %v to %v, which is not within the target dir %v",
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item, dstpath, tempdir)
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return false, false
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}
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if test.Select != nil {
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return test.Select(item, dstpath, node)
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}
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return true, true
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}
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errors := make(map[string]map[string]struct{})
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res.Error = func(location string, err error) error {
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location = filepath.ToSlash(location)
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t.Logf("restore returned error for %q: %v", location, err)
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if errors[location] == nil {
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errors[location] = make(map[string]struct{})
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}
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errors[location][err.Error()] = struct{}{}
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return nil
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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err := res.RestoreTo(ctx, tempdir)
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if err != nil {
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t.Fatal(err)
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}
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if len(test.ErrorsMust)+len(test.ErrorsMay) == 0 {
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_, err = res.VerifyFiles(ctx, tempdir)
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rtest.OK(t, err)
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}
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for location, expectedErrors := range test.ErrorsMust {
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actualErrors, ok := errors[location]
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if !ok {
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t.Errorf("expected error(s) for %v, found none", location)
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continue
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}
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rtest.Equals(t, expectedErrors, actualErrors)
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delete(errors, location)
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}
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for location, expectedErrors := range test.ErrorsMay {
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actualErrors, ok := errors[location]
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if !ok {
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continue
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}
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rtest.Equals(t, expectedErrors, actualErrors)
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delete(errors, location)
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}
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for filename, err := range errors {
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t.Errorf("unexpected error for %v found: %v", filename, err)
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}
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for filename, content := range test.Files {
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data, err := os.ReadFile(filepath.Join(tempdir, filepath.FromSlash(filename)))
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if err != nil {
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t.Errorf("unable to read file %v: %v", filename, err)
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continue
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}
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if !bytes.Equal(data, []byte(content)) {
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t.Errorf("file %v has wrong content: want %q, got %q", filename, content, data)
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}
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}
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})
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}
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}
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func TestRestorerRelative(t *testing.T) {
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var tests = []struct {
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Snapshot
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Files map[string]string
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}{
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"foo": File{Data: "content: foo\n"},
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"dirtest": Dir{
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Nodes: map[string]Node{
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"file": File{Data: "content: file\n"},
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},
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},
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},
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},
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Files: map[string]string{
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"foo": "content: foo\n",
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"dirtest/file": "content: file\n",
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},
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},
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}
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for _, test := range tests {
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t.Run("", func(t *testing.T) {
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repo := repository.TestRepository(t)
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sn, id := saveSnapshot(t, repo, test.Snapshot)
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t.Logf("snapshot saved as %v", id.Str())
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res := NewRestorer(repo, sn, false, nil)
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tempdir := rtest.TempDir(t)
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cleanup := rtest.Chdir(t, tempdir)
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defer cleanup()
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errors := make(map[string]string)
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res.Error = func(location string, err error) error {
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t.Logf("restore returned error for %q: %v", location, err)
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errors[location] = err.Error()
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return nil
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}
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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err := res.RestoreTo(ctx, "restore")
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if err != nil {
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t.Fatal(err)
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}
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nverified, err := res.VerifyFiles(ctx, "restore")
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rtest.OK(t, err)
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rtest.Equals(t, len(test.Files), nverified)
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for filename, err := range errors {
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t.Errorf("unexpected error for %v found: %v", filename, err)
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}
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for filename, content := range test.Files {
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data, err := os.ReadFile(filepath.Join(tempdir, "restore", filepath.FromSlash(filename)))
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if err != nil {
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t.Errorf("unable to read file %v: %v", filename, err)
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continue
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}
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if !bytes.Equal(data, []byte(content)) {
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t.Errorf("file %v has wrong content: want %q, got %q", filename, content, data)
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}
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}
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})
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}
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}
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type TraverseTreeCheck func(testing.TB) treeVisitor
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type TreeVisit struct {
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funcName string // name of the function
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location string // location passed to the function
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}
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func checkVisitOrder(list []TreeVisit) TraverseTreeCheck {
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var pos int
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return func(t testing.TB) treeVisitor {
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check := func(funcName string) func(*restic.Node, string, string) error {
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return func(node *restic.Node, target, location string) error {
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if pos >= len(list) {
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t.Errorf("step %v, %v(%v): expected no more than %d function calls", pos, funcName, location, len(list))
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pos++
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return nil
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}
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v := list[pos]
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if v.funcName != funcName {
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t.Errorf("step %v, location %v: want function %v, but %v was called",
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pos, location, v.funcName, funcName)
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}
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if location != filepath.FromSlash(v.location) {
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t.Errorf("step %v: want location %v, got %v", pos, list[pos].location, location)
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}
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pos++
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return nil
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}
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}
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return treeVisitor{
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enterDir: check("enterDir"),
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visitNode: check("visitNode"),
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leaveDir: check("leaveDir"),
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}
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}
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}
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func TestRestorerTraverseTree(t *testing.T) {
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var tests = []struct {
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Snapshot
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Select func(item string, dstpath string, node *restic.Node) (selectForRestore bool, childMayBeSelected bool)
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Visitor TraverseTreeCheck
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}{
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{
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// select everything
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"dir": Dir{Nodes: map[string]Node{
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"otherfile": File{Data: "x"},
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"subdir": Dir{Nodes: map[string]Node{
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"file": File{Data: "content: file\n"},
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}},
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}},
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"foo": File{Data: "content: foo\n"},
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},
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},
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Select: func(item string, dstpath string, node *restic.Node) (selectForRestore bool, childMayBeSelected bool) {
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return true, true
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},
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Visitor: checkVisitOrder([]TreeVisit{
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{"enterDir", "/dir"},
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{"visitNode", "/dir/otherfile"},
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{"enterDir", "/dir/subdir"},
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{"visitNode", "/dir/subdir/file"},
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{"leaveDir", "/dir/subdir"},
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{"leaveDir", "/dir"},
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{"visitNode", "/foo"},
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}),
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},
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// select only the top-level file
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{
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Snapshot: Snapshot{
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Nodes: map[string]Node{
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"dir": Dir{Nodes: map[string]Node{
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"otherfile": File{Data: "x"},
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"subdir": Dir{Nodes: map[string]Node{
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"file": File{Data: "content: file\n"},
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}},
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}},
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"foo": File{Data: "content: foo\n"},
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},
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},
|
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Select: func(item string, dstpath string, node *restic.Node) (selectForRestore bool, childMayBeSelected bool) {
|
|
if item == "/foo" {
|
|
return true, false
|
|
}
|
|
return false, false
|
|
},
|
|
Visitor: checkVisitOrder([]TreeVisit{
|
|
{"visitNode", "/foo"},
|
|
}),
|
|
},
|
|
{
|
|
Snapshot: Snapshot{
|
|
Nodes: map[string]Node{
|
|
"aaa": File{Data: "content: foo\n"},
|
|
"dir": Dir{Nodes: map[string]Node{
|
|
"otherfile": File{Data: "x"},
|
|
"subdir": Dir{Nodes: map[string]Node{
|
|
"file": File{Data: "content: file\n"},
|
|
}},
|
|
}},
|
|
},
|
|
},
|
|
Select: func(item string, dstpath string, node *restic.Node) (selectForRestore bool, childMayBeSelected bool) {
|
|
if item == "/aaa" {
|
|
return true, false
|
|
}
|
|
return false, false
|
|
},
|
|
Visitor: checkVisitOrder([]TreeVisit{
|
|
{"visitNode", "/aaa"},
|
|
}),
|
|
},
|
|
|
|
// select dir/
|
|
{
|
|
Snapshot: Snapshot{
|
|
Nodes: map[string]Node{
|
|
"dir": Dir{Nodes: map[string]Node{
|
|
"otherfile": File{Data: "x"},
|
|
"subdir": Dir{Nodes: map[string]Node{
|
|
"file": File{Data: "content: file\n"},
|
|
}},
|
|
}},
|
|
"foo": File{Data: "content: foo\n"},
|
|
},
|
|
},
|
|
Select: func(item string, dstpath string, node *restic.Node) (selectForRestore bool, childMayBeSelected bool) {
|
|
if strings.HasPrefix(item, "/dir") {
|
|
return true, true
|
|
}
|
|
return false, false
|
|
},
|
|
Visitor: checkVisitOrder([]TreeVisit{
|
|
{"enterDir", "/dir"},
|
|
{"visitNode", "/dir/otherfile"},
|
|
{"enterDir", "/dir/subdir"},
|
|
{"visitNode", "/dir/subdir/file"},
|
|
{"leaveDir", "/dir/subdir"},
|
|
{"leaveDir", "/dir"},
|
|
}),
|
|
},
|
|
|
|
// select only dir/otherfile
|
|
{
|
|
Snapshot: Snapshot{
|
|
Nodes: map[string]Node{
|
|
"dir": Dir{Nodes: map[string]Node{
|
|
"otherfile": File{Data: "x"},
|
|
"subdir": Dir{Nodes: map[string]Node{
|
|
"file": File{Data: "content: file\n"},
|
|
}},
|
|
}},
|
|
"foo": File{Data: "content: foo\n"},
|
|
},
|
|
},
|
|
Select: func(item string, dstpath string, node *restic.Node) (selectForRestore bool, childMayBeSelected bool) {
|
|
switch item {
|
|
case "/dir":
|
|
return false, true
|
|
case "/dir/otherfile":
|
|
return true, false
|
|
default:
|
|
return false, false
|
|
}
|
|
},
|
|
Visitor: checkVisitOrder([]TreeVisit{
|
|
{"visitNode", "/dir/otherfile"},
|
|
{"leaveDir", "/dir"},
|
|
}),
|
|
},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
t.Run("", func(t *testing.T) {
|
|
repo := repository.TestRepository(t)
|
|
sn, _ := saveSnapshot(t, repo, test.Snapshot)
|
|
|
|
res := NewRestorer(repo, sn, false, nil)
|
|
|
|
res.SelectFilter = test.Select
|
|
|
|
tempdir := rtest.TempDir(t)
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
|
|
// make sure we're creating a new subdir of the tempdir
|
|
target := filepath.Join(tempdir, "target")
|
|
|
|
_, err := res.traverseTree(ctx, target, string(filepath.Separator), *sn.Tree, test.Visitor(t))
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func normalizeFileMode(mode os.FileMode) os.FileMode {
|
|
if runtime.GOOS == "windows" {
|
|
if mode.IsDir() {
|
|
return 0555 | os.ModeDir
|
|
}
|
|
return os.FileMode(0444)
|
|
}
|
|
return mode
|
|
}
|
|
|
|
func checkConsistentInfo(t testing.TB, file string, fi os.FileInfo, modtime time.Time, mode os.FileMode) {
|
|
if fi.Mode() != mode {
|
|
t.Errorf("checking %q, Mode() returned wrong value, want 0%o, got 0%o", file, mode, fi.Mode())
|
|
}
|
|
|
|
if !fi.ModTime().Equal(modtime) {
|
|
t.Errorf("checking %s, ModTime() returned wrong value, want %v, got %v", file, modtime, fi.ModTime())
|
|
}
|
|
}
|
|
|
|
// test inspired from test case https://github.com/restic/restic/issues/1212
|
|
func TestRestorerConsistentTimestampsAndPermissions(t *testing.T) {
|
|
timeForTest := time.Date(2019, time.January, 9, 1, 46, 40, 0, time.UTC)
|
|
|
|
repo := repository.TestRepository(t)
|
|
|
|
sn, _ := saveSnapshot(t, repo, Snapshot{
|
|
Nodes: map[string]Node{
|
|
"dir": Dir{
|
|
Mode: normalizeFileMode(0750 | os.ModeDir),
|
|
ModTime: timeForTest,
|
|
Nodes: map[string]Node{
|
|
"file1": File{
|
|
Mode: normalizeFileMode(os.FileMode(0700)),
|
|
ModTime: timeForTest,
|
|
Data: "content: file\n",
|
|
},
|
|
"anotherfile": File{
|
|
Data: "content: file\n",
|
|
},
|
|
"subdir": Dir{
|
|
Mode: normalizeFileMode(0700 | os.ModeDir),
|
|
ModTime: timeForTest,
|
|
Nodes: map[string]Node{
|
|
"file2": File{
|
|
Mode: normalizeFileMode(os.FileMode(0666)),
|
|
ModTime: timeForTest,
|
|
Links: 2,
|
|
Inode: 1,
|
|
},
|
|
},
|
|
},
|
|
},
|
|
},
|
|
},
|
|
})
|
|
|
|
res := NewRestorer(repo, sn, false, nil)
|
|
|
|
res.SelectFilter = func(item string, dstpath string, node *restic.Node) (selectedForRestore bool, childMayBeSelected bool) {
|
|
switch filepath.ToSlash(item) {
|
|
case "/dir":
|
|
childMayBeSelected = true
|
|
case "/dir/file1":
|
|
selectedForRestore = true
|
|
childMayBeSelected = false
|
|
case "/dir/subdir":
|
|
selectedForRestore = true
|
|
childMayBeSelected = true
|
|
case "/dir/subdir/file2":
|
|
selectedForRestore = true
|
|
childMayBeSelected = false
|
|
}
|
|
return selectedForRestore, childMayBeSelected
|
|
}
|
|
|
|
tempdir := rtest.TempDir(t)
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
|
|
err := res.RestoreTo(ctx, tempdir)
|
|
rtest.OK(t, err)
|
|
|
|
var testPatterns = []struct {
|
|
path string
|
|
modtime time.Time
|
|
mode os.FileMode
|
|
}{
|
|
{"dir", timeForTest, normalizeFileMode(0750 | os.ModeDir)},
|
|
{filepath.Join("dir", "file1"), timeForTest, normalizeFileMode(os.FileMode(0700))},
|
|
{filepath.Join("dir", "subdir"), timeForTest, normalizeFileMode(0700 | os.ModeDir)},
|
|
{filepath.Join("dir", "subdir", "file2"), timeForTest, normalizeFileMode(os.FileMode(0666))},
|
|
}
|
|
|
|
for _, test := range testPatterns {
|
|
f, err := os.Stat(filepath.Join(tempdir, test.path))
|
|
rtest.OK(t, err)
|
|
checkConsistentInfo(t, test.path, f, test.modtime, test.mode)
|
|
}
|
|
}
|
|
|
|
// VerifyFiles must not report cancelation of its context through res.Error.
|
|
func TestVerifyCancel(t *testing.T) {
|
|
snapshot := Snapshot{
|
|
Nodes: map[string]Node{
|
|
"foo": File{Data: "content: foo\n"},
|
|
},
|
|
}
|
|
|
|
repo := repository.TestRepository(t)
|
|
sn, _ := saveSnapshot(t, repo, snapshot)
|
|
|
|
res := NewRestorer(repo, sn, false, nil)
|
|
|
|
tempdir := rtest.TempDir(t)
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
|
|
rtest.OK(t, res.RestoreTo(ctx, tempdir))
|
|
err := os.WriteFile(filepath.Join(tempdir, "foo"), []byte("bar"), 0644)
|
|
rtest.OK(t, err)
|
|
|
|
var errs []error
|
|
res.Error = func(filename string, err error) error {
|
|
errs = append(errs, err)
|
|
return err
|
|
}
|
|
|
|
nverified, err := res.VerifyFiles(ctx, tempdir)
|
|
rtest.Equals(t, 0, nverified)
|
|
rtest.Assert(t, err != nil, "nil error from VerifyFiles")
|
|
rtest.Equals(t, 1, len(errs))
|
|
rtest.Assert(t, strings.Contains(errs[0].Error(), "Invalid file size for"), "wrong error %q", errs[0].Error())
|
|
}
|
|
|
|
func TestRestorerSparseFiles(t *testing.T) {
|
|
repo := repository.TestRepository(t)
|
|
|
|
var zeros [1<<20 + 13]byte
|
|
|
|
target := &fs.Reader{
|
|
Mode: 0600,
|
|
Name: "/zeros",
|
|
ReadCloser: io.NopCloser(bytes.NewReader(zeros[:])),
|
|
}
|
|
sc := archiver.NewScanner(target)
|
|
err := sc.Scan(context.TODO(), []string{"/zeros"})
|
|
rtest.OK(t, err)
|
|
|
|
arch := archiver.New(repo, target, archiver.Options{})
|
|
sn, _, err := arch.Snapshot(context.Background(), []string{"/zeros"},
|
|
archiver.SnapshotOptions{})
|
|
rtest.OK(t, err)
|
|
|
|
res := NewRestorer(repo, sn, true, nil)
|
|
|
|
tempdir := rtest.TempDir(t)
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
|
|
err = res.RestoreTo(ctx, tempdir)
|
|
rtest.OK(t, err)
|
|
|
|
filename := filepath.Join(tempdir, "zeros")
|
|
content, err := os.ReadFile(filename)
|
|
rtest.OK(t, err)
|
|
|
|
rtest.Equals(t, len(zeros[:]), len(content))
|
|
rtest.Equals(t, zeros[:], content)
|
|
|
|
blocks := getBlockCount(t, filename)
|
|
if blocks < 0 {
|
|
return
|
|
}
|
|
|
|
// st.Blocks is the size in 512-byte blocks.
|
|
denseBlocks := math.Ceil(float64(len(zeros)) / 512)
|
|
sparsity := 1 - float64(blocks)/denseBlocks
|
|
|
|
// This should report 100% sparse. We don't assert that,
|
|
// as the behavior of sparse writes depends on the underlying
|
|
// file system as well as the OS.
|
|
t.Logf("wrote %d zeros as %d blocks, %.1f%% sparse",
|
|
len(zeros), blocks, 100*sparsity)
|
|
}
|