update github.com/docker/docker and relevant deps

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

15 files changed, 878 insertions, 0 deletions

diff --git a/vendor/github.com/moby/sys/mount/LICENSE b/vendor/github.com/moby/sys/mount/LICENSE
new file mode 100644
index 000000000..d64569567
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/LICENSE
@@ -0,0 +1,202 @@
+
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diff --git a/vendor/github.com/moby/sys/mount/flags.go b/vendor/github.com/moby/sys/mount/flags.go
new file mode 100644
index 000000000..d514a9d8e
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/flags.go
@@ -0,0 +1,137 @@
+package mount
+
+import (
+	"fmt"
+	"strings"
+)
+
+var flags = map[string]struct {
+	clear bool
+	flag  int
+}{
+	"defaults":      {false, 0},
+	"ro":            {false, RDONLY},
+	"rw":            {true, RDONLY},
+	"suid":          {true, NOSUID},
+	"nosuid":        {false, NOSUID},
+	"dev":           {true, NODEV},
+	"nodev":         {false, NODEV},
+	"exec":          {true, NOEXEC},
+	"noexec":        {false, NOEXEC},
+	"sync":          {false, SYNCHRONOUS},
+	"async":         {true, SYNCHRONOUS},
+	"dirsync":       {false, DIRSYNC},
+	"remount":       {false, REMOUNT},
+	"mand":          {false, MANDLOCK},
+	"nomand":        {true, MANDLOCK},
+	"atime":         {true, NOATIME},
+	"noatime":       {false, NOATIME},
+	"diratime":      {true, NODIRATIME},
+	"nodiratime":    {false, NODIRATIME},
+	"bind":          {false, BIND},
+	"rbind":         {false, RBIND},
+	"unbindable":    {false, UNBINDABLE},
+	"runbindable":   {false, RUNBINDABLE},
+	"private":       {false, PRIVATE},
+	"rprivate":      {false, RPRIVATE},
+	"shared":        {false, SHARED},
+	"rshared":       {false, RSHARED},
+	"slave":         {false, SLAVE},
+	"rslave":        {false, RSLAVE},
+	"relatime":      {false, RELATIME},
+	"norelatime":    {true, RELATIME},
+	"strictatime":   {false, STRICTATIME},
+	"nostrictatime": {true, STRICTATIME},
+}
+
+var validFlags = map[string]bool{
+	"":          true,
+	"size":      true,
+	"mode":      true,
+	"uid":       true,
+	"gid":       true,
+	"nr_inodes": true,
+	"nr_blocks": true,
+	"mpol":      true,
+}
+
+var propagationFlags = map[string]bool{
+	"bind":        true,
+	"rbind":       true,
+	"unbindable":  true,
+	"runbindable": true,
+	"private":     true,
+	"rprivate":    true,
+	"shared":      true,
+	"rshared":     true,
+	"slave":       true,
+	"rslave":      true,
+}
+
+// MergeTmpfsOptions merge mount options to make sure there is no duplicate.
+func MergeTmpfsOptions(options []string) ([]string, error) {
+	// We use collisions maps to remove duplicates.
+	// For flag, the key is the flag value (the key for propagation flag is -1)
+	// For data=value, the key is the data
+	flagCollisions := map[int]bool{}
+	dataCollisions := map[string]bool{}
+
+	var newOptions []string
+	// We process in reverse order
+	for i := len(options) - 1; i >= 0; i-- {
+		option := options[i]
+		if option == "defaults" {
+			continue
+		}
+		if f, ok := flags[option]; ok && f.flag != 0 {
+			// There is only one propagation mode
+			key := f.flag
+			if propagationFlags[option] {
+				key = -1
+			}
+			// Check to see if there is collision for flag
+			if !flagCollisions[key] {
+				// We prepend the option and add to collision map
+				newOptions = append([]string{option}, newOptions...)
+				flagCollisions[key] = true
+			}
+			continue
+		}
+		opt := strings.SplitN(option, "=", 2)
+		if len(opt) != 2 || !validFlags[opt[0]] {
+			return nil, fmt.Errorf("Invalid tmpfs option %q", opt)
+		}
+		if !dataCollisions[opt[0]] {
+			// We prepend the option and add to collision map
+			newOptions = append([]string{option}, newOptions...)
+			dataCollisions[opt[0]] = true
+		}
+	}
+
+	return newOptions, nil
+}
+
+// Parse fstab type mount options into mount() flags
+// and device specific data
+func parseOptions(options string) (int, string) {
+	var (
+		flag int
+		data []string
+	)
+
+	for _, o := range strings.Split(options, ",") {
+		// If the option does not exist in the flags table or the flag
+		// is not supported on the platform,
+		// then it is a data value for a specific fs type
+		if f, exists := flags[o]; exists && f.flag != 0 {
+			if f.clear {
+				flag &= ^f.flag
+			} else {
+				flag |= f.flag
+			}
+		} else {
+			data = append(data, o)
+		}
+	}
+	return flag, strings.Join(data, ",")
+}
diff --git a/vendor/github.com/moby/sys/mount/flags_freebsd.go b/vendor/github.com/moby/sys/mount/flags_freebsd.go
new file mode 100644
index 000000000..69c50680d
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/flags_freebsd.go
@@ -0,0 +1,48 @@
+// +build freebsd,cgo
+
+package mount
+
+/*
+#include <sys/mount.h>
+*/
+import "C"
+
+const (
+	// RDONLY will mount the filesystem as read-only.
+	RDONLY = C.MNT_RDONLY
+
+	// NOSUID will not allow set-user-identifier or set-group-identifier bits to
+	// take effect.
+	NOSUID = C.MNT_NOSUID
+
+	// NOEXEC will not allow execution of any binaries on the mounted file system.
+	NOEXEC = C.MNT_NOEXEC
+
+	// SYNCHRONOUS will allow any I/O to the file system to be done synchronously.
+	SYNCHRONOUS = C.MNT_SYNCHRONOUS
+
+	// NOATIME will not update the file access time when reading from a file.
+	NOATIME = C.MNT_NOATIME
+)
+
+// These flags are unsupported.
+const (
+	BIND        = 0
+	DIRSYNC     = 0
+	MANDLOCK    = 0
+	NODEV       = 0
+	NODIRATIME  = 0
+	UNBINDABLE  = 0
+	RUNBINDABLE = 0
+	PRIVATE     = 0
+	RPRIVATE    = 0
+	SHARED      = 0
+	RSHARED     = 0
+	SLAVE       = 0
+	RSLAVE      = 0
+	RBIND       = 0
+	RELATIME    = 0
+	REMOUNT     = 0
+	STRICTATIME = 0
+	mntDetach   = 0
+)
diff --git a/vendor/github.com/moby/sys/mount/flags_linux.go b/vendor/github.com/moby/sys/mount/flags_linux.go
new file mode 100644
index 000000000..0425d0dd6
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/flags_linux.go
@@ -0,0 +1,87 @@
+package mount
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+const (
+	// RDONLY will mount the file system read-only.
+	RDONLY = unix.MS_RDONLY
+
+	// NOSUID will not allow set-user-identifier or set-group-identifier bits to
+	// take effect.
+	NOSUID = unix.MS_NOSUID
+
+	// NODEV will not interpret character or block special devices on the file
+	// system.
+	NODEV = unix.MS_NODEV
+
+	// NOEXEC will not allow execution of any binaries on the mounted file system.
+	NOEXEC = unix.MS_NOEXEC
+
+	// SYNCHRONOUS will allow I/O to the file system to be done synchronously.
+	SYNCHRONOUS = unix.MS_SYNCHRONOUS
+
+	// DIRSYNC will force all directory updates within the file system to be done
+	// synchronously. This affects the following system calls: create, link,
+	// unlink, symlink, mkdir, rmdir, mknod and rename.
+	DIRSYNC = unix.MS_DIRSYNC
+
+	// REMOUNT will attempt to remount an already-mounted file system. This is
+	// commonly used to change the mount flags for a file system, especially to
+	// make a readonly file system writeable. It does not change device or mount
+	// point.
+	REMOUNT = unix.MS_REMOUNT
+
+	// MANDLOCK will force mandatory locks on a filesystem.
+	MANDLOCK = unix.MS_MANDLOCK
+
+	// NOATIME will not update the file access time when reading from a file.
+	NOATIME = unix.MS_NOATIME
+
+	// NODIRATIME will not update the directory access time.
+	NODIRATIME = unix.MS_NODIRATIME
+
+	// BIND remounts a subtree somewhere else.
+	BIND = unix.MS_BIND
+
+	// RBIND remounts a subtree and all possible submounts somewhere else.
+	RBIND = unix.MS_BIND | unix.MS_REC
+
+	// UNBINDABLE creates a mount which cannot be cloned through a bind operation.
+	UNBINDABLE = unix.MS_UNBINDABLE
+
+	// RUNBINDABLE marks the entire mount tree as UNBINDABLE.
+	RUNBINDABLE = unix.MS_UNBINDABLE | unix.MS_REC
+
+	// PRIVATE creates a mount which carries no propagation abilities.
+	PRIVATE = unix.MS_PRIVATE
+
+	// RPRIVATE marks the entire mount tree as PRIVATE.
+	RPRIVATE = unix.MS_PRIVATE | unix.MS_REC
+
+	// SLAVE creates a mount which receives propagation from its master, but not
+	// vice versa.
+	SLAVE = unix.MS_SLAVE
+
+	// RSLAVE marks the entire mount tree as SLAVE.
+	RSLAVE = unix.MS_SLAVE | unix.MS_REC
+
+	// SHARED creates a mount which provides the ability to create mirrors of
+	// that mount such that mounts and unmounts within any of the mirrors
+	// propagate to the other mirrors.
+	SHARED = unix.MS_SHARED
+
+	// RSHARED marks the entire mount tree as SHARED.
+	RSHARED = unix.MS_SHARED | unix.MS_REC
+
+	// RELATIME updates inode access times relative to modify or change time.
+	RELATIME = unix.MS_RELATIME
+
+	// STRICTATIME allows to explicitly request full atime updates.  This makes
+	// it possible for the kernel to default to relatime or noatime but still
+	// allow userspace to override it.
+	STRICTATIME = unix.MS_STRICTATIME
+
+	mntDetach = unix.MNT_DETACH
+)
diff --git a/vendor/github.com/moby/sys/mount/flags_unsupported.go b/vendor/github.com/moby/sys/mount/flags_unsupported.go
new file mode 100644
index 000000000..e1d64f6b9
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/flags_unsupported.go
@@ -0,0 +1,30 @@
+// +build !linux,!freebsd freebsd,!cgo
+
+package mount
+
+// These flags are unsupported.
+const (
+	BIND        = 0
+	DIRSYNC     = 0
+	MANDLOCK    = 0
+	NOATIME     = 0
+	NODEV       = 0
+	NODIRATIME  = 0
+	NOEXEC      = 0
+	NOSUID      = 0
+	UNBINDABLE  = 0
+	RUNBINDABLE = 0
+	PRIVATE     = 0
+	RPRIVATE    = 0
+	SHARED      = 0
+	RSHARED     = 0
+	SLAVE       = 0
+	RSLAVE      = 0
+	RBIND       = 0
+	RELATIME    = 0
+	REMOUNT     = 0
+	STRICTATIME = 0
+	SYNCHRONOUS = 0
+	RDONLY      = 0
+	mntDetach   = 0
+)
diff --git a/vendor/github.com/moby/sys/mount/go.mod b/vendor/github.com/moby/sys/mount/go.mod
new file mode 100644
index 000000000..21cef0a95
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/go.mod
@@ -0,0 +1,8 @@
+module github.com/moby/sys/mount
+
+go 1.14
+
+require (
+	github.com/moby/sys/mountinfo v0.1.0
+	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae
+)
diff --git a/vendor/github.com/moby/sys/mount/go.sum b/vendor/github.com/moby/sys/mount/go.sum
new file mode 100644
index 000000000..ae99f8596
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/go.sum
@@ -0,0 +1,4 @@
+github.com/moby/sys/mountinfo v0.1.0 h1:r8vMRbMAFEAfiNptYVokP+nfxPJzvRuia5e2vzXtENo=
+github.com/moby/sys/mountinfo v0.1.0/go.mod h1:w2t2Avltqx8vE7gX5l+QiBKxODu2TX0+Syr3h52Tw4o=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/vendor/github.com/moby/sys/mount/mount.go b/vendor/github.com/moby/sys/mount/mount.go
new file mode 100644
index 000000000..4a7bb27b1
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/mount.go
@@ -0,0 +1,67 @@
+// +build go1.13
+
+package mount
+
+import (
+	"fmt"
+	"sort"
+
+	"github.com/moby/sys/mountinfo"
+)
+
+// Mount will mount filesystem according to the specified configuration.
+// Options must be specified like the mount or fstab unix commands:
+// "opt1=val1,opt2=val2". See flags.go for supported option flags.
+func Mount(device, target, mType, options string) error {
+	flag, data := parseOptions(options)
+	return mount(device, target, mType, uintptr(flag), data)
+}
+
+// Unmount lazily unmounts a filesystem on supported platforms, otherwise does
+// a normal unmount.  If target is not a mount point, no error is returned.
+func Unmount(target string) error {
+	return unmount(target, mntDetach)
+}
+
+// RecursiveUnmount unmounts the target and all mounts underneath, starting
+// with the deepest mount first. The argument does not have to be a mount
+// point itself.
+func RecursiveUnmount(target string) error {
+	// Fast path, works if target is a mount point that can be unmounted.
+	// On Linux, mntDetach flag ensures a recursive unmount.  For other
+	// platforms, if there are submounts, we'll get EBUSY (and fall back
+	// to the slow path). NOTE we do not ignore EINVAL here as target might
+	// not be a mount point itself (but there can be mounts underneath).
+	if err := unmountBare(target, mntDetach); err == nil {
+		return nil
+	}
+
+	// Slow path: get all submounts, sort, unmount one by one.
+	mounts, err := mountinfo.GetMounts(mountinfo.PrefixFilter(target))
+	if err != nil {
+		return err
+	}
+
+	// Make the deepest mount be first
+	sort.Slice(mounts, func(i, j int) bool {
+		return len(mounts[i].Mountpoint) > len(mounts[j].Mountpoint)
+	})
+
+	var suberr error
+	for i, m := range mounts {
+		err = unmount(m.Mountpoint, mntDetach)
+		if err != nil {
+			if i == len(mounts)-1 { // last mount
+				return fmt.Errorf("%w (possible cause: %s)", err, suberr)
+			}
+			// This is a submount, we can ignore the error for now,
+			// the final unmount will fail if this is a real problem.
+			// With that in mind, the _first_ failed unmount error
+			// might be the real error cause, so let's keep it.
+			if suberr == nil {
+				suberr = err
+			}
+		}
+	}
+	return nil
+}
diff --git a/vendor/github.com/moby/sys/mount/mount_errors.go b/vendor/github.com/moby/sys/mount/mount_errors.go
new file mode 100644
index 000000000..936a26373
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/mount_errors.go
@@ -0,0 +1,46 @@
+// +build !windows
+
+package mount
+
+import "strconv"
+
+// mountError records an error from mount or unmount operation
+type mountError struct {
+	op             string
+	source, target string
+	flags          uintptr
+	data           string
+	err            error
+}
+
+func (e *mountError) Error() string {
+	out := e.op + " "
+
+	if e.source != "" {
+		out += e.source + ":" + e.target
+	} else {
+		out += e.target
+	}
+
+	if e.flags != uintptr(0) {
+		out += ", flags: 0x" + strconv.FormatUint(uint64(e.flags), 16)
+	}
+	if e.data != "" {
+		out += ", data: " + e.data
+	}
+
+	out += ": " + e.err.Error()
+	return out
+}
+
+// Cause returns the underlying cause of the error.
+// This is a convention used in github.com/pkg/errors
+func (e *mountError) Cause() error {
+	return e.err
+}
+
+// Unwrap returns the underlying error.
+// This is a convention used in golang 1.13+
+func (e *mountError) Unwrap() error {
+	return e.err
+}
diff --git a/vendor/github.com/moby/sys/mount/mounter_freebsd.go b/vendor/github.com/moby/sys/mount/mounter_freebsd.go
new file mode 100644
index 000000000..3964af4f7
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/mounter_freebsd.go
@@ -0,0 +1,59 @@
+package mount
+
+/*
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/_iovec.h>
+#include <sys/mount.h>
+#include <sys/param.h>
+*/
+import "C"
+
+import (
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+func allocateIOVecs(options []string) []C.struct_iovec {
+	out := make([]C.struct_iovec, len(options))
+	for i, option := range options {
+		out[i].iov_base = unsafe.Pointer(C.CString(option))
+		out[i].iov_len = C.size_t(len(option) + 1)
+	}
+	return out
+}
+
+func mount(device, target, mType string, flag uintptr, data string) error {
+	isNullFS := false
+
+	xs := strings.Split(data, ",")
+	for _, x := range xs {
+		if x == "bind" {
+			isNullFS = true
+		}
+	}
+
+	options := []string{"fspath", target}
+	if isNullFS {
+		options = append(options, "fstype", "nullfs", "target", device)
+	} else {
+		options = append(options, "fstype", mType, "from", device)
+	}
+	rawOptions := allocateIOVecs(options)
+	for _, rawOption := range rawOptions {
+		defer C.free(rawOption.iov_base)
+	}
+
+	if errno := C.nmount(&rawOptions[0], C.uint(len(options)), C.int(flag)); errno != 0 {
+		return &mountError{
+			op:     "mount",
+			source: device,
+			target: target,
+			flags:  flag,
+			err:    syscall.Errno(errno),
+		}
+	}
+	return nil
+}
diff --git a/vendor/github.com/moby/sys/mount/mounter_linux.go b/vendor/github.com/moby/sys/mount/mounter_linux.go
new file mode 100644
index 000000000..0c477cc3d
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/mounter_linux.go
@@ -0,0 +1,73 @@
+package mount
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+const (
+	// ptypes is the set propagation types.
+	ptypes = unix.MS_SHARED | unix.MS_PRIVATE | unix.MS_SLAVE | unix.MS_UNBINDABLE
+
+	// pflags is the full set valid flags for a change propagation call.
+	pflags = ptypes | unix.MS_REC | unix.MS_SILENT
+
+	// broflags is the combination of bind and read only
+	broflags = unix.MS_BIND | unix.MS_RDONLY
+)
+
+// isremount returns true if either device name or flags identify a remount request, false otherwise.
+func isremount(device string, flags uintptr) bool {
+	switch {
+	// We treat device "" and "none" as a remount request to provide compatibility with
+	// requests that don't explicitly set MS_REMOUNT such as those manipulating bind mounts.
+	case flags&unix.MS_REMOUNT != 0, device == "", device == "none":
+		return true
+	default:
+		return false
+	}
+}
+
+func mount(device, target, mType string, flags uintptr, data string) error {
+	oflags := flags &^ ptypes
+	if !isremount(device, flags) || data != "" {
+		// Initial call applying all non-propagation flags for mount
+		// or remount with changed data
+		if err := unix.Mount(device, target, mType, oflags, data); err != nil {
+			return &mountError{
+				op:     "mount",
+				source: device,
+				target: target,
+				flags:  oflags,
+				data:   data,
+				err:    err,
+			}
+		}
+	}
+
+	if flags&ptypes != 0 {
+		// Change the propagation type.
+		if err := unix.Mount("", target, "", flags&pflags, ""); err != nil {
+			return &mountError{
+				op:     "remount",
+				target: target,
+				flags:  flags & pflags,
+				err:    err,
+			}
+		}
+	}
+
+	if oflags&broflags == broflags {
+		// Remount the bind to apply read only.
+		if err := unix.Mount("", target, "", oflags|unix.MS_REMOUNT, ""); err != nil {
+			return &mountError{
+				op:     "remount-ro",
+				target: target,
+				flags:  oflags | unix.MS_REMOUNT,
+				err:    err,
+			}
+
+		}
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/moby/sys/mount/mounter_unsupported.go b/vendor/github.com/moby/sys/mount/mounter_unsupported.go
new file mode 100644
index 000000000..15380671c
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/mounter_unsupported.go
@@ -0,0 +1,7 @@
+// +build !linux,!freebsd freebsd,!cgo
+
+package mount
+
+func mount(device, target, mType string, flag uintptr, data string) error {
+	panic("Not implemented")
+}
diff --git a/vendor/github.com/moby/sys/mount/sharedsubtree_linux.go b/vendor/github.com/moby/sys/mount/sharedsubtree_linux.go
new file mode 100644
index 000000000..948e6bacd
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/sharedsubtree_linux.go
@@ -0,0 +1,73 @@
+package mount
+
+import "github.com/moby/sys/mountinfo"
+
+// MakeShared ensures a mounted filesystem has the SHARED mount option enabled.
+// See the supported options in flags.go for further reference.
+func MakeShared(mountPoint string) error {
+	return ensureMountedAs(mountPoint, SHARED)
+}
+
+// MakeRShared ensures a mounted filesystem has the RSHARED mount option enabled.
+// See the supported options in flags.go for further reference.
+func MakeRShared(mountPoint string) error {
+	return ensureMountedAs(mountPoint, RSHARED)
+}
+
+// MakePrivate ensures a mounted filesystem has the PRIVATE mount option enabled.
+// See the supported options in flags.go for further reference.
+func MakePrivate(mountPoint string) error {
+	return ensureMountedAs(mountPoint, PRIVATE)
+}
+
+// MakeRPrivate ensures a mounted filesystem has the RPRIVATE mount option
+// enabled. See the supported options in flags.go for further reference.
+func MakeRPrivate(mountPoint string) error {
+	return ensureMountedAs(mountPoint, RPRIVATE)
+}
+
+// MakeSlave ensures a mounted filesystem has the SLAVE mount option enabled.
+// See the supported options in flags.go for further reference.
+func MakeSlave(mountPoint string) error {
+	return ensureMountedAs(mountPoint, SLAVE)
+}
+
+// MakeRSlave ensures a mounted filesystem has the RSLAVE mount option enabled.
+// See the supported options in flags.go for further reference.
+func MakeRSlave(mountPoint string) error {
+	return ensureMountedAs(mountPoint, RSLAVE)
+}
+
+// MakeUnbindable ensures a mounted filesystem has the UNBINDABLE mount option
+// enabled. See the supported options in flags.go for further reference.
+func MakeUnbindable(mountPoint string) error {
+	return ensureMountedAs(mountPoint, UNBINDABLE)
+}
+
+// MakeRUnbindable ensures a mounted filesystem has the RUNBINDABLE mount
+// option enabled. See the supported options in flags.go for further reference.
+func MakeRUnbindable(mountPoint string) error {
+	return ensureMountedAs(mountPoint, RUNBINDABLE)
+}
+
+// MakeMount ensures that the file or directory given is a mount point,
+// bind mounting it to itself it case it is not.
+func MakeMount(mnt string) error {
+	mounted, err := mountinfo.Mounted(mnt)
+	if err != nil {
+		return err
+	}
+	if mounted {
+		return nil
+	}
+
+	return mount(mnt, mnt, "none", uintptr(BIND), "")
+}
+
+func ensureMountedAs(mnt string, flags int) error {
+	if err := MakeMount(mnt); err != nil {
+		return err
+	}
+
+	return mount("", mnt, "none", uintptr(flags), "")
+}
diff --git a/vendor/github.com/moby/sys/mount/unmount_unix.go b/vendor/github.com/moby/sys/mount/unmount_unix.go
new file mode 100644
index 000000000..924d059a7
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/unmount_unix.go
@@ -0,0 +1,26 @@
+// +build !windows
+
+package mount
+
+import "golang.org/x/sys/unix"
+
+func unmountBare(target string, flags int) error {
+	return unix.Unmount(target, flags)
+}
+
+func unmount(target string, flags int) error {
+	err := unmountBare(target, flags)
+	if err == nil || err == unix.EINVAL {
+		// Ignore "not mounted" error here. Note the same error
+		// can be returned if flags are invalid, so this code
+		// assumes that the flags value is always correct.
+		return nil
+	}
+
+	return &mountError{
+		op:     "umount",
+		target: target,
+		flags:  uintptr(flags),
+		err:    err,
+	}
+}
diff --git a/vendor/github.com/moby/sys/mount/unmount_unsupported.go b/vendor/github.com/moby/sys/mount/unmount_unsupported.go
new file mode 100644
index 000000000..4d6073ec6
--- /dev/null
+++ b/vendor/github.com/moby/sys/mount/unmount_unsupported.go
@@ -0,0 +1,11 @@
+// +build windows
+
+package mount
+
+func unmountBare(_ string, _ int) error {
+	panic("Not implemented")
+}
+
+func unmount(_ string, _ int) error {
+	panic("Not implemented")
+}