225 lines
5.7 KiB
Go
225 lines
5.7 KiB
Go
package archive
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import (
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"context"
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"io/ioutil"
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"os"
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"os/exec"
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"os/user"
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"testing"
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"time"
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_ "crypto/sha256"
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"github.com/docker/containerd/fs"
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"github.com/docker/containerd/fs/fstest"
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"github.com/pkg/errors"
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)
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const tarCmd = "/usr/bin/tar"
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// baseApplier creates a basic filesystem layout
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// with multiple types of files for basic tests.
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var baseApplier = fstest.Apply(
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fstest.CreateDir("/etc/", 0755),
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fstest.CreateFile("/etc/hosts", []byte("127.0.0.1 localhost"), 0644),
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fstest.Link("/etc/hosts", "/etc/hosts.allow"),
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fstest.CreateDir("/usr/local/lib", 0755),
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fstest.CreateFile("/usr/local/lib/libnothing.so", []byte{0x00, 0x00}, 0755),
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fstest.Symlink("libnothing.so", "/usr/local/lib/libnothing.so.2"),
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fstest.CreateDir("/home", 0755),
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fstest.CreateDir("/home/derek", 0700),
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)
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func TestUnpack(t *testing.T) {
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requireTar(t)
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if err := testApply(baseApplier); err != nil {
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t.Fatalf("Test apply failed: %+v", err)
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}
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}
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func TestBaseDiff(t *testing.T) {
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requireTar(t)
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if err := testBaseDiff(baseApplier); err != nil {
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t.Fatalf("Test base diff failed: %+v", err)
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}
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}
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func TestDiffApply(t *testing.T) {
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as := []fstest.Applier{
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baseApplier,
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fstest.Apply(
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fstest.CreateFile("/etc/hosts", []byte("127.0.0.1 localhost.localdomain"), 0644),
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fstest.CreateFile("/etc/fstab", []byte("/dev/sda1\t/\text4\tdefaults 1 1\n"), 0600),
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fstest.CreateFile("/etc/badfile", []byte(""), 0666),
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fstest.CreateFile("/home/derek/.zshrc", []byte("#ZSH is just better\n"), 0640),
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),
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fstest.Apply(
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fstest.RemoveFile("/etc/badfile"),
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fstest.Rename("/home/derek", "/home/notderek"),
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),
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fstest.Apply(
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fstest.RemoveFile("/usr"),
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fstest.RemoveFile("/etc/hosts.allow"),
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),
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fstest.Apply(
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fstest.RemoveFile("/home"),
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fstest.CreateDir("/home/derek", 0700),
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fstest.CreateFile("/home/derek/.bashrc", []byte("#not going away\n"), 0640),
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// "/etc/hosts" must be touched to be hardlinked in same layer
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fstest.Chtime("/etc/hosts", time.Now()),
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fstest.Link("/etc/hosts", "/etc/hosts.allow"),
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),
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}
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if err := testDiffApply(as...); err != nil {
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t.Fatalf("Test diff apply failed: %+v", err)
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}
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}
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func testApply(a fstest.Applier) error {
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td, err := ioutil.TempDir("", "test-apply-")
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if err != nil {
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return errors.Wrap(err, "failed to create temp dir")
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}
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defer os.RemoveAll(td)
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dest, err := ioutil.TempDir("", "test-apply-dest-")
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if err != nil {
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return errors.Wrap(err, "failed to create temp dir")
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}
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defer os.RemoveAll(dest)
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if err := a.Apply(td); err != nil {
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return errors.Wrap(err, "failed to apply filesystem changes")
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}
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tarArgs := []string{"c", "-C", td}
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names, err := readDirNames(td)
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if err != nil {
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return errors.Wrap(err, "failed to read directory names")
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}
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tarArgs = append(tarArgs, names...)
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cmd := exec.Command(tarCmd, tarArgs...)
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arch, err := cmd.StdoutPipe()
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if err != nil {
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return errors.Wrap(err, "failed to create stdout pipe")
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}
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if err := cmd.Start(); err != nil {
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return errors.Wrap(err, "failed to start command")
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}
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if _, err := ApplyDiffTar(context.Background(), dest, arch); err != nil {
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return errors.Wrap(err, "failed to apply tar stream")
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}
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return fstest.CheckDirectoryEqual(td, dest)
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}
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func testBaseDiff(a fstest.Applier) error {
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td, err := ioutil.TempDir("", "test-base-diff-")
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if err != nil {
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return errors.Wrap(err, "failed to create temp dir")
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}
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defer os.RemoveAll(td)
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dest, err := ioutil.TempDir("", "test-base-diff-dest-")
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if err != nil {
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return errors.Wrap(err, "failed to create temp dir")
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}
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defer os.RemoveAll(dest)
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if err := a.Apply(td); err != nil {
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return errors.Wrap(err, "failed to apply filesystem changes")
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}
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arch := DiffTarStream(context.Background(), "", td)
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cmd := exec.Command(tarCmd, "x", "-C", dest)
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cmd.Stdin = arch
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if err := cmd.Run(); err != nil {
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return errors.Wrap(err, "tar command failed")
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}
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return fstest.CheckDirectoryEqual(td, dest)
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}
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func testDiffApply(as ...fstest.Applier) error {
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base, err := ioutil.TempDir("", "test-diff-apply-base-")
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if err != nil {
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return errors.Wrap(err, "failed to create temp dir")
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}
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defer os.RemoveAll(base)
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dest, err := ioutil.TempDir("", "test-diff-apply-dest-")
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if err != nil {
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return errors.Wrap(err, "failed to create temp dir")
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}
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defer os.RemoveAll(dest)
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ctx := context.Background()
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for i, a := range as {
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if err := diffApply(ctx, a, base, dest); err != nil {
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return errors.Wrapf(err, "diff apply failed at layer %d", i)
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}
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}
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return nil
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}
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// diffApply applies the given changes on the base and
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// computes the diff and applies to the dest.
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func diffApply(ctx context.Context, a fstest.Applier, base, dest string) error {
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baseCopy, err := ioutil.TempDir("", "test-diff-apply-copy-")
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if err != nil {
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return errors.Wrap(err, "failed to create temp dir")
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}
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defer os.RemoveAll(baseCopy)
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if err := fs.CopyDir(baseCopy, base); err != nil {
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return errors.Wrap(err, "failed to copy base")
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}
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if err := a.Apply(base); err != nil {
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return errors.Wrap(err, "failed to apply changes to base")
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}
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if _, err := ApplyDiffTar(ctx, dest, DiffTarStream(ctx, baseCopy, base)); err != nil {
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return errors.Wrap(err, "failed to apply tar stream")
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}
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return fstest.CheckDirectoryEqual(base, dest)
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}
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func readDirNames(p string) ([]string, error) {
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fis, err := ioutil.ReadDir(p)
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if err != nil {
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return nil, err
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}
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names := make([]string, len(fis))
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for i, fi := range fis {
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names[i] = fi.Name()
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}
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return names, nil
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}
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func requireTar(t *testing.T) {
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if _, err := os.Stat(tarCmd); err != nil {
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if os.IsNotExist(err) {
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t.Skipf("%s not found, skipping", tarCmd)
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} else {
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t.Fatalf("Unable to stat %s: %v", tarCmd, err)
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}
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}
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}
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func requireRoot(t *testing.T) {
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u, err := user.Current()
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if err != nil {
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t.Fatalf("Unable to get current user: %v", err)
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}
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if u.Uid != "0" {
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t.Skipf("test requires root, skipping")
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}
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}
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