vendor: update containerd/continuity efbc4488d8fe1bdc16bde3b2d2990d9b3a899165

full diff: d3ef23f19f...efbc4488d8

Fix sameFile() to recognize empty files as the same
  - fixes "Empty files can diff as "modified" even when they're not"

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor/github.com/containerd/continuity/context.go

@@ -596,7 +596,7 @@ func (c *context) Walk(fn filepath.WalkFunc) error {
 			return err
 		}
 	}
-	return c.pathDriver.Walk(root, func(p string, fi os.FileInfo, err error) error {
+	return c.pathDriver.Walk(root, func(p string, fi os.FileInfo, _ error) error {
 		contained, err := c.containWithRoot(p, root)
 		return fn(contained, fi, err)
 	})
@@ -613,12 +613,6 @@ func (c *context) fullpath(p string) (string, error) {
 	return p, nil
 }
 
-// contain cleans and santizes the filesystem path p to be an absolute path,
-// effectively relative to the context root.
-func (c *context) contain(p string) (string, error) {
-	return c.containWithRoot(p, c.root)
-}
-
 // containWithRoot cleans and santizes the filesystem path p to be an absolute path,
 // effectively relative to the passed root. Extra care should be used when calling this
 // instead of contain. This is needed for Walk, as if context root is a symlink,

vendor/github.com/containerd/continuity/devices/devices_unix.go

@@ -32,6 +32,7 @@ func DeviceInfo(fi os.FileInfo) (uint64, uint64, error) {
 		return 0, 0, fmt.Errorf("cannot extract device from os.FileInfo")
 	}
 
+	//nolint:unconvert
 	dev := uint64(sys.Rdev)
 	return uint64(unix.Major(dev)), uint64(unix.Minor(dev)), nil
 }

vendor/github.com/containerd/continuity/digests.go

@@ -88,13 +88,9 @@ func digestsMatch(as, bs []digest.Digest) bool {
 	}
 
 	disjoint := len(as) + len(bs)
-	if len(uniqified) == disjoint {
-		// if these two sets have the same cardinality, we know both sides
-		// didn't share any digests.
-		return false
-	}
-
-	return true
+	// if these two sets have the same cardinality, we know both sides
+	// didn't share any digests.
+	return len(uniqified) != disjoint
 }
 
 type digestSlice []digest.Digest

vendor/github.com/containerd/continuity/driver/driver_windows.go

@@ -1,3 +1,5 @@
+// +build go1.13
+
 /*
    Copyright The containerd Authors.
 
@@ -14,8 +16,6 @@
    limitations under the License.
 */
 
-// +build go1.13
-
 // Go 1.13 is the minimally supported version for Windows.
 // Earlier golang releases have bug in os.Readlink
 // (see https://github.com/golang/go/issues/30463).

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

@@ -47,7 +47,7 @@ func (l resourceListDifference) HasDiff() bool {
 	}
 
 	for _, add := range l.Additions {
-		if ok, _ := metadataFiles[add.Path()]; !ok {
+		if ok := metadataFiles[add.Path()]; !ok {
 			return true
 		}
 	}
@@ -66,7 +66,7 @@ func (l resourceListDifference) String() string {
 	for _, upt := range l.Updates {
 		fmt.Fprintf(buf, "~ %s\n", upt.String())
 	}
-	return string(buf.Bytes())
+	return buf.String()
 }
 
 // diffManifest compares two resource lists and returns the list

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

@@ -210,7 +210,7 @@ var (
 	}
 
 	// Hardlink name before with modification
-	// Tests link is created for unmodified files when new hardlinked file is seen first
+	// Tests link is created for unmodified files when a new hard linked file is seen first
 	hardlinkBeforeUnmodified = []Applier{
 		baseApplier,
 		Apply(

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

@@ -117,15 +117,13 @@ func sameFile(f1, f2 *currentPath) (bool, error) {
 		// If the timestamp may have been truncated in both of the
 		// files, check content of file to determine difference
 		if t1.Nanosecond() == 0 && t2.Nanosecond() == 0 {
-			var eq bool
 			if (f1.f.Mode() & os.ModeSymlink) == os.ModeSymlink {
-				eq, err = compareSymlinkTarget(f1.fullPath, f2.fullPath)
-			} else if f1.f.Size() > 0 {
-				eq, err = compareFileContent(f1.fullPath, f2.fullPath)
+				return compareSymlinkTarget(f1.fullPath, f2.fullPath)
 			}
-			if err != nil || !eq {
-				return eq, err
+			if f1.f.Size() == 0 { // if file sizes are zero length, the files are the same by definition
+				return true, nil
 			}
+			return compareFileContent(f1.fullPath, f2.fullPath)
 		} else if t1.Nanosecond() != t2.Nanosecond() {
 			return false, nil
 		}

vendor/github.com/containerd/continuity/go.mod

@@ -1,6 +1,6 @@
 module github.com/containerd/continuity
 
-go 1.11
+go 1.13
 
 require (
 	bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898

vendor/github.com/containerd/continuity/groups_unix.go

@@ -14,6 +14,7 @@
    limitations under the License.
 */
 
+//nolint:unused,deadcode
 package continuity
 
 import (

vendor/github.com/containerd/continuity/hardlinks.go

@@ -53,7 +53,7 @@ func (hlm *hardlinkManager) Add(fi os.FileInfo, resource Resource) error {
 }
 
 // Merge processes the current state of the hardlink manager and merges any
-// shared nodes into hardlinked resources.
+// shared nodes into hard linked resources.
 func (hlm *hardlinkManager) Merge() ([]Resource, error) {
 	var resources []Resource
 	for key, linked := range hlm.hardlinks {

vendor/github.com/containerd/continuity/hardlinks_unix.go

@@ -48,5 +48,6 @@ func newHardlinkKey(fi os.FileInfo) (hardlinkKey, error) {
 		return hardlinkKey{}, errNotAHardLink
 	}
 
+	//nolint:unconvert
 	return hardlinkKey{dev: uint64(sys.Dev), inode: uint64(sys.Ino)}, nil
 }

vendor/github.com/containerd/continuity/manifest.go

@@ -114,11 +114,13 @@ func BuildManifest(ctx Context) (*Manifest, error) {
 	}
 
 	// merge and post-process the hardlinks.
+	// nolint:misspell
 	hardlinked, err := hardlinks.Merge()
 	if err != nil {
 		return nil, err
 	}
 
+	// nolint:misspell
 	for _, resource := range hardlinked {
 		resourcesByPath[resource.Path()] = resource
 	}

vendor/github.com/containerd/continuity/sysx/xattr_unsupported.go

@@ -23,7 +23,7 @@ import (
 	"runtime"
 )
 
-var unsupported = errors.New("extended attributes unsupported on " + runtime.GOOS)
+var errUnsupported = errors.New("extended attributes unsupported on " + runtime.GOOS)
 
 // Listxattr calls syscall listxattr and reads all content
 // and returns a string array
@@ -33,17 +33,17 @@ func Listxattr(path string) ([]string, error) {
 
 // Removexattr calls syscall removexattr
 func Removexattr(path string, attr string) (err error) {
-	return unsupported
+	return errUnsupported
 }
 
 // Setxattr calls syscall setxattr
 func Setxattr(path string, attr string, data []byte, flags int) (err error) {
-	return unsupported
+	return errUnsupported
 }
 
 // Getxattr calls syscall getxattr
 func Getxattr(path, attr string) ([]byte, error) {
-	return []byte{}, unsupported
+	return []byte{}, errUnsupported
 }
 
 // LListxattr lists xattrs, not following symlinks
@@ -53,12 +53,12 @@ func LListxattr(path string) ([]string, error) {
 
 // LRemovexattr removes an xattr, not following symlinks
 func LRemovexattr(path string, attr string) (err error) {
-	return unsupported
+	return errUnsupported
 }
 
 // LSetxattr sets an xattr, not following symlinks
 func LSetxattr(path string, attr string, data []byte, flags int) (err error) {
-	return unsupported
+	return errUnsupported
 }
 
 // LGetxattr gets an xattr, not following symlinks

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

@@ -22,8 +22,8 @@ import (
 	"io/ioutil"
 	"os"
 	"os/exec"
-	"syscall"
 	"strings"
+	"syscall"
 
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -70,9 +70,9 @@ func New(size int64) (*Loopback, error) {
 	}
 
 	l := Loopback{
-		File: file.Name(),
+		File:   file.Name(),
 		Device: deviceName,
-		close: cleanup,
+		close:  cleanup,
 	}
 	return &l, nil
 }
@@ -83,7 +83,7 @@ type Loopback struct {
 	File string
 	// Device is /dev/loopX
 	Device string
-	close func() error
+	close  func() error
 }
 
 // SoftSize returns st_size