Update continuity vendor

Pulls in copy and fstest changes

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

mount/lookup_linux_test.go

@@ -50,25 +50,25 @@ func testLookup(t *testing.T, fsType string) {
 	}
 	defer os.RemoveAll(mnt)
 
-	deviceName, cleanupDevice, err := loopback.New(100 << 20) // 100 MB
+	loop, err := loopback.New(100 << 20) // 100 MB
 	if err != nil {
 		t.Fatal(err)
 	}
-	if out, err := exec.Command("mkfs", "-t", fsType, deviceName).CombinedOutput(); err != nil {
+	if out, err := exec.Command("mkfs", "-t", fsType, loop.Device).CombinedOutput(); err != nil {
 		// not fatal
-		cleanupDevice()
-		t.Skipf("could not mkfs (%s) %s: %v (out: %q)", fsType, deviceName, err, string(out))
+		loop.Close()
+		t.Skipf("could not mkfs (%s) %s: %v (out: %q)", fsType, loop.Device, err, string(out))
 	}
-	if out, err := exec.Command("mount", deviceName, mnt).CombinedOutput(); err != nil {
+	if out, err := exec.Command("mount", loop.Device, mnt).CombinedOutput(); err != nil {
 		// not fatal
-		cleanupDevice()
-		t.Skipf("could not mount %s: %v (out: %q)", deviceName, err, string(out))
+		loop.Close()
+		t.Skipf("could not mount %s: %v (out: %q)", loop.Device, err, string(out))
 	}
 	defer func() {
 		testutil.Unmount(t, mnt)
-		cleanupDevice()
+		loop.Close()
 	}()
-	assert.Check(t, strings.HasPrefix(deviceName, "/dev/loop"))
+	assert.Check(t, strings.HasPrefix(loop.Device, "/dev/loop"))
 	checkLookup(t, fsType, mnt, mnt)
 
 	newMnt, err := ioutil.TempDir("", "containerd-mountinfo-test-newMnt")

snapshots/btrfs/btrfs_test.go

@@ -52,24 +52,24 @@ func boltSnapshotter(t *testing.T) func(context.Context, string) (snapshots.Snap
 		if os.Getpagesize() > 4096 {
 			loopbackSize = int64(650 << 20) // 650 MB
 		}
-		deviceName, cleanupDevice, err := loopback.New(loopbackSize)
+		loop, err := loopback.New(loopbackSize)
 
 		if err != nil {
 			return nil, nil, err
 		}
 
-		if out, err := exec.Command(mkbtrfs, deviceName).CombinedOutput(); err != nil {
-			cleanupDevice()
+		if out, err := exec.Command(mkbtrfs, loop.Device).CombinedOutput(); err != nil {
+			loop.Close()
 			return nil, nil, errors.Wrapf(err, "failed to make btrfs filesystem (out: %q)", out)
 		}
-		if out, err := exec.Command("mount", deviceName, root).CombinedOutput(); err != nil {
-			cleanupDevice()
-			return nil, nil, errors.Wrapf(err, "failed to mount device %s (out: %q)", deviceName, out)
+		if out, err := exec.Command("mount", loop.Device, root).CombinedOutput(); err != nil {
+			loop.Close()
+			return nil, nil, errors.Wrapf(err, "failed to mount device %s (out: %q)", loop.Device, out)
 		}
 
 		snapshotter, err := NewSnapshotter(root)
 		if err != nil {
-			cleanupDevice()
+			loop.Close()
 			return nil, nil, errors.Wrap(err, "failed to create new snapshotter")
 		}
 
@@ -78,7 +78,7 @@ func boltSnapshotter(t *testing.T) func(context.Context, string) (snapshots.Snap
 				return err
 			}
 			err := mount.UnmountAll(root, unix.MNT_DETACH)
-			if cerr := cleanupDevice(); cerr != nil {
+			if cerr := loop.Close(); cerr != nil {
 				err = errors.Wrap(cerr, "device cleanup failed")
 			}
 			return err

snapshots/overlay/check_test.go

@@ -36,23 +36,23 @@ func testOverlaySupported(t testing.TB, expected bool, mkfs ...string) {
 	}
 	defer os.RemoveAll(mnt)
 
-	deviceName, cleanupDevice, err := loopback.New(100 << 20) // 100 MB
+	loop, err := loopback.New(100 << 20) // 100 MB
 	if err != nil {
 		t.Fatal(err)
 	}
-	if out, err := exec.Command(mkfs[0], append(mkfs[1:], deviceName)...).CombinedOutput(); err != nil {
+	if out, err := exec.Command(mkfs[0], append(mkfs[1:], loop.Device)...).CombinedOutput(); err != nil {
 		// not fatal
-		cleanupDevice()
-		t.Skipf("could not mkfs (%v) %s: %v (out: %q)", mkfs, deviceName, err, string(out))
+		loop.Close()
+		t.Skipf("could not mkfs (%v) %s: %v (out: %q)", mkfs, loop.Device, err, string(out))
 	}
-	if out, err := exec.Command("mount", deviceName, mnt).CombinedOutput(); err != nil {
+	if out, err := exec.Command("mount", loop.Device, mnt).CombinedOutput(); err != nil {
 		// not fatal
-		cleanupDevice()
-		t.Skipf("could not mount %s: %v (out: %q)", deviceName, err, string(out))
+		loop.Close()
+		t.Skipf("could not mount %s: %v (out: %q)", loop.Device, err, string(out))
 	}
 	defer func() {
 		testutil.Unmount(t, mnt)
-		cleanupDevice()
+		loop.Close()
 	}()
 	workload := func() {
 		err = Supported(mnt)

vendor.conf

@@ -4,7 +4,7 @@ github.com/containerd/cgroups c4b9ac5c7601384c965b9646fc515884e091ebb9
 github.com/containerd/typeurl a93fcdb778cd272c6e9b3028b2f42d813e785d40
 github.com/containerd/fifo 3d5202aec260678c48179c56f40e6f38a095738c
 github.com/containerd/btrfs af5082808c833de0e79c1e72eea9fea239364877
-github.com/containerd/continuity bd77b46c8352f74eb12c85bdc01f4b90f69d66b4
+github.com/containerd/continuity f2a389ac0a02ce21c09edd7344677a601970f41c
 github.com/coreos/go-systemd 48702e0da86bd25e76cfef347e2adeb434a0d0a6
 github.com/docker/go-metrics 4ea375f7759c82740c893fc030bc37088d2ec098
 github.com/docker/go-events 9461782956ad83b30282bf90e31fa6a70c255ba9

vendor/github.com/containerd/continuity/LICENSE

@@ -1,6 +1,7 @@
+
                                  Apache License
                            Version 2.0, January 2004
-                        http://www.apache.org/licenses/
+                        https://www.apache.org/licenses/
 
    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
@@ -175,28 +176,16 @@
 
    END OF TERMS AND CONDITIONS
 
-   APPENDIX: How to apply the Apache License to your work.
-
-      To apply the Apache License to your work, attach the following
-      boilerplate notice, with the fields enclosed by brackets "{}"
-      replaced with your own identifying information. (Don't include
-      the brackets!)  The text should be enclosed in the appropriate
-      comment syntax for the file format. We also recommend that a
-      file or class name and description of purpose be included on the
-      same "printed page" as the copyright notice for easier
-      identification within third-party archives.
-
-   Copyright {yyyy} {name of copyright owner}
+   Copyright The containerd Authors
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
 
-       http://www.apache.org/licenses/LICENSE-2.0
+       https://www.apache.org/licenses/LICENSE-2.0
 
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
-

vendor/github.com/containerd/continuity/README.md

@@ -72,3 +72,13 @@ If you change the proto file you will need to rebuild the generated Go with `go
 ```console
 $ go generate ./proto
 ```
+
+## Project details
+
+continuity is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
+As a containerd sub-project, you will find the:
+ * [Project governance](https://github.com/containerd/project/blob/master/GOVERNANCE.md),
+ * [Maintainers](https://github.com/containerd/project/blob/master/MAINTAINERS),
+ * and [Contributing guidelines](https://github.com/containerd/project/blob/master/CONTRIBUTING.md)
+
+information in our [`containerd/project`](https://github.com/containerd/project) repository.

vendor/github.com/containerd/continuity/fs/copy.go

@@ -32,14 +32,49 @@ var bufferPool = &sync.Pool{
 	},
 }
 
-// CopyDir copies the directory from src to dst.
-// Most efficient copy of files is attempted.
-func CopyDir(dst, src string) error {
-	inodes := map[uint64]string{}
-	return copyDirectory(dst, src, inodes)
+// XAttrErrorHandlers transform a non-nil xattr error.
+// Return nil to ignore an error.
+// xattrKey can be empty for listxattr operation.
+type XAttrErrorHandler func(dst, src, xattrKey string, err error) error
+
+type copyDirOpts struct {
+	xeh XAttrErrorHandler
 }
 
-func copyDirectory(dst, src string, inodes map[uint64]string) error {
+type CopyDirOpt func(*copyDirOpts) error
+
+// WithXAttrErrorHandler allows specifying XAttrErrorHandler
+// If nil XAttrErrorHandler is specified (default), CopyDir stops
+// on a non-nil xattr error.
+func WithXAttrErrorHandler(xeh XAttrErrorHandler) CopyDirOpt {
+	return func(o *copyDirOpts) error {
+		o.xeh = xeh
+		return nil
+	}
+}
+
+// WithAllowXAttrErrors allows ignoring xattr errors.
+func WithAllowXAttrErrors() CopyDirOpt {
+	xeh := func(dst, src, xattrKey string, err error) error {
+		return nil
+	}
+	return WithXAttrErrorHandler(xeh)
+}
+
+// CopyDir copies the directory from src to dst.
+// Most efficient copy of files is attempted.
+func CopyDir(dst, src string, opts ...CopyDirOpt) error {
+	var o copyDirOpts
+	for _, opt := range opts {
+		if err := opt(&o); err != nil {
+			return err
+		}
+	}
+	inodes := map[uint64]string{}
+	return copyDirectory(dst, src, inodes, &o)
+}
+
+func copyDirectory(dst, src string, inodes map[uint64]string, o *copyDirOpts) error {
 	stat, err := os.Stat(src)
 	if err != nil {
 		return errors.Wrapf(err, "failed to stat %s", src)
@@ -75,7 +110,7 @@ func copyDirectory(dst, src string, inodes map[uint64]string) error {
 
 		switch {
 		case fi.IsDir():
-			if err := copyDirectory(target, source, inodes); err != nil {
+			if err := copyDirectory(target, source, inodes, o); err != nil {
 				return err
 			}
 			continue
@@ -111,7 +146,7 @@ func copyDirectory(dst, src string, inodes map[uint64]string) error {
 			return errors.Wrap(err, "failed to copy file info")
 		}
 
-		if err := copyXAttrs(target, source); err != nil {
+		if err := copyXAttrs(target, source, o.xeh); err != nil {
 			return errors.Wrap(err, "failed to copy xattrs")
 		}
 	}

vendor/github.com/containerd/continuity/fs/copy_linux.go

@@ -59,6 +59,8 @@ func copyFileInfo(fi os.FileInfo, name string) error {
 	return nil
 }
 
+const maxSSizeT = int64(^uint(0) >> 1)
+
 func copyFileContent(dst, src *os.File) error {
 	st, err := src.Stat()
 	if err != nil {
@@ -71,7 +73,16 @@ func copyFileContent(dst, src *os.File) error {
 	dstFd := int(dst.Fd())
 
 	for size > 0 {
-		n, err := unix.CopyFileRange(srcFd, nil, dstFd, nil, int(size), 0)
+		// Ensure that we are never trying to copy more than SSIZE_MAX at a
+		// time and at the same time avoids overflows when the file is larger
+		// than 4GB on 32-bit systems.
+		var copySize int
+		if size > maxSSizeT {
+			copySize = int(maxSSizeT)
+		} else {
+			copySize = int(size)
+		}
+		n, err := unix.CopyFileRange(srcFd, nil, dstFd, nil, copySize, 0)
 		if err != nil {
 			if (err != unix.ENOSYS && err != unix.EXDEV) || !first {
 				return errors.Wrap(err, "copy file range failed")
@@ -90,18 +101,34 @@ func copyFileContent(dst, src *os.File) error {
 	return nil
 }
 
-func copyXAttrs(dst, src string) error {
+func copyXAttrs(dst, src string, xeh XAttrErrorHandler) error {
 	xattrKeys, err := sysx.LListxattr(src)
 	if err != nil {
-		return errors.Wrapf(err, "failed to list xattrs on %s", src)
+		e := errors.Wrapf(err, "failed to list xattrs on %s", src)
+		if xeh != nil {
+			e = xeh(dst, src, "", e)
+		}
+		return e
 	}
 	for _, xattr := range xattrKeys {
 		data, err := sysx.LGetxattr(src, xattr)
 		if err != nil {
-			return errors.Wrapf(err, "failed to get xattr %q on %s", xattr, src)
+			e := errors.Wrapf(err, "failed to get xattr %q on %s", xattr, src)
+			if xeh != nil {
+				if e = xeh(dst, src, xattr, e); e == nil {
+					continue
+				}
+			}
+			return e
 		}
 		if err := sysx.LSetxattr(dst, xattr, data, 0); err != nil {
-			return errors.Wrapf(err, "failed to set xattr %q on %s", xattr, dst)
+			e := errors.Wrapf(err, "failed to set xattr %q on %s", xattr, dst)
+			if xeh != nil {
+				if e = xeh(dst, src, xattr, e); e == nil {
+					continue
+				}
+			}
+			return e
 		}
 	}
 

vendor/github.com/containerd/continuity/fs/copy_unix.go

@@ -69,18 +69,34 @@ func copyFileContent(dst, src *os.File) error {
 	return err
 }
 
-func copyXAttrs(dst, src string) error {
+func copyXAttrs(dst, src string, xeh XAttrErrorHandler) error {
 	xattrKeys, err := sysx.LListxattr(src)
 	if err != nil {
-		return errors.Wrapf(err, "failed to list xattrs on %s", src)
+		e := errors.Wrapf(err, "failed to list xattrs on %s", src)
+		if xeh != nil {
+			e = xeh(dst, src, "", e)
+		}
+		return e
 	}
 	for _, xattr := range xattrKeys {
 		data, err := sysx.LGetxattr(src, xattr)
 		if err != nil {
-			return errors.Wrapf(err, "failed to get xattr %q on %s", xattr, src)
+			e := errors.Wrapf(err, "failed to get xattr %q on %s", xattr, src)
+			if xeh != nil {
+				if e = xeh(dst, src, xattr, e); e == nil {
+					continue
+				}
+			}
+			return e
 		}
 		if err := sysx.LSetxattr(dst, xattr, data, 0); err != nil {
-			return errors.Wrapf(err, "failed to set xattr %q on %s", xattr, dst)
+			e := errors.Wrapf(err, "failed to set xattr %q on %s", xattr, dst)
+			if xeh != nil {
+				if e = xeh(dst, src, xattr, e); e == nil {
+					continue
+				}
+			}
+			return e
 		}
 	}
 

vendor/github.com/containerd/continuity/fs/copy_windows.go

@@ -40,7 +40,7 @@ func copyFileContent(dst, src *os.File) error {
 	return err
 }
 
-func copyXAttrs(dst, src string) error {
+func copyXAttrs(dst, src string, xeh XAttrErrorHandler) error {
 	return nil
 }
 

vendor/github.com/containerd/continuity/fs/fstest/compare.go

@@ -49,15 +49,7 @@ func CheckDirectoryEqual(d1, d2 string) error {
 
 	diff := diffResourceList(m1.Resources, m2.Resources)
 	if diff.HasDiff() {
-		if len(diff.Deletions) != 0 {
-			return errors.Errorf("directory diff between %s and %s\n%s", d1, d2, diff.String())
-		}
-		// TODO: Also skip Recycle Bin contents in Windows layers which is used to store deleted files in some cases
-		for _, add := range diff.Additions {
-			if ok, _ := metadataFiles[add.Path()]; !ok {
-				return errors.Errorf("directory diff between %s and %s\n%s", d1, d2, diff.String())
-			}
-		}
+		return errors.Errorf("directory diff between %s and %s\n%s", d1, d2, diff.String())
 	}
 
 	return nil

vendor/github.com/containerd/continuity/fs/fstest/compare_windows.go

@@ -17,6 +17,7 @@
 package fstest
 
 // TODO: Any more metadata files generated by Windows layers?
+// TODO: Also skip Recycle Bin contents in Windows layers which is used to store deleted files in some cases
 var metadataFiles = map[string]bool{
 	"\\System Volume Information": true,
 	"\\WcSandboxState":            true,

vendor/github.com/containerd/continuity/fs/fstest/continuity_util.go

@@ -42,7 +42,17 @@ type resourceListDifference struct {
 }
 
 func (l resourceListDifference) HasDiff() bool {
-	return len(l.Additions) > 0 || len(l.Deletions) > 0 || len(l.Updates) > 0
+	if len(l.Deletions) > 0 || len(l.Updates) > 0 || (len(metadataFiles) == 0 && len(l.Additions) > 0) {
+		return true
+	}
+
+	for _, add := range l.Additions {
+		if ok, _ := metadataFiles[add.Path()]; !ok {
+			return true
+		}
+	}
+
+	return false
 }
 
 func (l resourceListDifference) String() string {

vendor/github.com/containerd/continuity/fs/path.go

@@ -22,7 +22,6 @@ import (
 	"io"
 	"os"
 	"path/filepath"
-	"strings"
 
 	"github.com/pkg/errors"
 )
@@ -47,9 +46,8 @@ func pathChange(lower, upper *currentPath) (ChangeKind, string) {
 	if upper == nil {
 		return ChangeKindDelete, lower.path
 	}
-	// TODO: compare by directory
 
-	switch i := strings.Compare(lower.path, upper.path); {
+	switch i := directoryCompare(lower.path, upper.path); {
 	case i < 0:
 		// File in lower that is not in upper
 		return ChangeKindDelete, lower.path
@@ -61,6 +59,35 @@ func pathChange(lower, upper *currentPath) (ChangeKind, string) {
 	}
 }
 
+func directoryCompare(a, b string) int {
+	l := len(a)
+	if len(b) < l {
+		l = len(b)
+	}
+	for i := 0; i < l; i++ {
+		c1, c2 := a[i], b[i]
+		if c1 == filepath.Separator {
+			c1 = byte(0)
+		}
+		if c2 == filepath.Separator {
+			c2 = byte(0)
+		}
+		if c1 < c2 {
+			return -1
+		}
+		if c1 > c2 {
+			return +1
+		}
+	}
+	if len(a) < len(b) {
+		return -1
+	}
+	if len(a) > len(b) {
+		return +1
+	}
+	return 0
+}
+
 func sameFile(f1, f2 *currentPath) (bool, error) {
 	if os.SameFile(f1.f, f2.f) {
 		return true, nil

vendor/github.com/containerd/continuity/testutil/loopback/loopback_linux.go

@@ -22,24 +22,25 @@ import (
 	"io/ioutil"
 	"os"
 	"os/exec"
+	"syscall"
 	"strings"
 
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
 
-// New creates a loopback device, and returns its device name (/dev/loopX), and its clean-up function.
-func New(size int64) (string, func() error, error) {
+// New creates a loopback device
+func New(size int64) (*Loopback, error) {
 	// create temporary file for the disk image
 	file, err := ioutil.TempFile("", "containerd-test-loopback")
 	if err != nil {
-		return "", nil, errors.Wrap(err, "could not create temporary file for loopback")
+		return nil, errors.Wrap(err, "could not create temporary file for loopback")
 	}
 
 	if err := file.Truncate(size); err != nil {
 		file.Close()
 		os.Remove(file.Name())
-		return "", nil, errors.Wrap(err, "failed to resize temp file")
+		return nil, errors.Wrap(err, "failed to resize temp file")
 	}
 	file.Close()
 
@@ -48,7 +49,7 @@ func New(size int64) (string, func() error, error) {
 	p, err := losetup.Output()
 	if err != nil {
 		os.Remove(file.Name())
-		return "", nil, errors.Wrap(err, "loopback setup failed")
+		return nil, errors.Wrap(err, "loopback setup failed")
 	}
 
 	deviceName := strings.TrimSpace(string(p))
@@ -68,5 +69,47 @@ func New(size int64) (string, func() error, error) {
 		return os.Remove(file.Name())
 	}
 
-	return deviceName, cleanup, nil
+	l := Loopback{
+		File: file.Name(),
+		Device: deviceName,
+		close: cleanup,
+	}
+	return &l, nil
+}
+
+// Loopback device
+type Loopback struct {
+	// File is the underlying sparse file
+	File string
+	// Device is /dev/loopX
+	Device string
+	close func() error
+}
+
+// SoftSize returns st_size
+func (l *Loopback) SoftSize() (int64, error) {
+	st, err := os.Stat(l.File)
+	if err != nil {
+		return 0, err
+	}
+	return st.Size(), nil
+}
+
+// HardSize returns st_blocks * 512; see stat(2)
+func (l *Loopback) HardSize() (int64, error) {
+	st, err := os.Stat(l.File)
+	if err != nil {
+		return 0, err
+	}
+	st2, ok := st.Sys().(*syscall.Stat_t)
+	if !ok {
+		return 0, errors.New("st.Sys() is not a *syscall.Stat_t")
+	}
+	// NOTE: st_blocks has nothing to do with st_blksize; see stat(2)
+	return st2.Blocks * 512, nil
+}
+
+// Close detaches the device and removes the underlying file
+func (l *Loopback) Close() error {
+	return l.close()
 }