vendor: update

18 files changed, 1856 insertions, 0 deletions

diff --git a/vendor/github.com/rogpeppe/go-internal/LICENSE b/vendor/github.com/rogpeppe/go-internal/LICENSE
new file mode 100644
index 000000000..49ea0f928
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2018 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/mksyscall.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/mksyscall.go
new file mode 100644
index 000000000..a8edafb3c
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/mksyscall.go
@@ -0,0 +1,7 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go syscall_windows.go security_windows.go psapi_windows.go symlink_windows.go
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/psapi_windows.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/psapi_windows.go
new file mode 100644
index 000000000..b138e658a
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/psapi_windows.go
@@ -0,0 +1,20 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+type PROCESS_MEMORY_COUNTERS struct {
+	CB                         uint32
+	PageFaultCount             uint32
+	PeakWorkingSetSize         uintptr
+	WorkingSetSize             uintptr
+	QuotaPeakPagedPoolUsage    uintptr
+	QuotaPagedPoolUsage        uintptr
+	QuotaPeakNonPagedPoolUsage uintptr
+	QuotaNonPagedPoolUsage     uintptr
+	PagefileUsage              uintptr
+	PeakPagefileUsage          uintptr
+}
+
+//sys	GetProcessMemoryInfo(handle syscall.Handle, memCounters *PROCESS_MEMORY_COUNTERS, cb uint32) (err error) = psapi.GetProcessMemoryInfo
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/reparse_windows.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/reparse_windows.go
new file mode 100644
index 000000000..7c6ad8fb7
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/reparse_windows.go
@@ -0,0 +1,64 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+const (
+	FSCTL_SET_REPARSE_POINT    = 0x000900A4
+	IO_REPARSE_TAG_MOUNT_POINT = 0xA0000003
+
+	SYMLINK_FLAG_RELATIVE = 1
+)
+
+// These structures are described
+// in https://msdn.microsoft.com/en-us/library/cc232007.aspx
+// and https://msdn.microsoft.com/en-us/library/cc232006.aspx.
+
+// REPARSE_DATA_BUFFER_HEADER is a common part of REPARSE_DATA_BUFFER structure.
+type REPARSE_DATA_BUFFER_HEADER struct {
+	ReparseTag uint32
+	// The size, in bytes, of the reparse data that follows
+	// the common portion of the REPARSE_DATA_BUFFER element.
+	// This value is the length of the data starting at the
+	// SubstituteNameOffset field.
+	ReparseDataLength uint16
+	Reserved          uint16
+}
+
+type SymbolicLinkReparseBuffer struct {
+	// The integer that contains the offset, in bytes,
+	// of the substitute name string in the PathBuffer array,
+	// computed as an offset from byte 0 of PathBuffer. Note that
+	// this offset must be divided by 2 to get the array index.
+	SubstituteNameOffset uint16
+	// The integer that contains the length, in bytes, of the
+	// substitute name string. If this string is null-terminated,
+	// SubstituteNameLength does not include the Unicode null character.
+	SubstituteNameLength uint16
+	// PrintNameOffset is similar to SubstituteNameOffset.
+	PrintNameOffset uint16
+	// PrintNameLength is similar to SubstituteNameLength.
+	PrintNameLength uint16
+	// Flags specifies whether the substitute name is a full path name or
+	// a path name relative to the directory containing the symbolic link.
+	Flags      uint32
+	PathBuffer [1]uint16
+}
+
+type MountPointReparseBuffer struct {
+	// The integer that contains the offset, in bytes,
+	// of the substitute name string in the PathBuffer array,
+	// computed as an offset from byte 0 of PathBuffer. Note that
+	// this offset must be divided by 2 to get the array index.
+	SubstituteNameOffset uint16
+	// The integer that contains the length, in bytes, of the
+	// substitute name string. If this string is null-terminated,
+	// SubstituteNameLength does not include the Unicode null character.
+	SubstituteNameLength uint16
+	// PrintNameOffset is similar to SubstituteNameOffset.
+	PrintNameOffset uint16
+	// PrintNameLength is similar to SubstituteNameLength.
+	PrintNameLength uint16
+	PathBuffer      [1]uint16
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/security_windows.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/security_windows.go
new file mode 100644
index 000000000..4a2dfc0c7
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/security_windows.go
@@ -0,0 +1,128 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const (
+	SecurityAnonymous      = 0
+	SecurityIdentification = 1
+	SecurityImpersonation  = 2
+	SecurityDelegation     = 3
+)
+
+//sys	ImpersonateSelf(impersonationlevel uint32) (err error) = advapi32.ImpersonateSelf
+//sys	RevertToSelf() (err error) = advapi32.RevertToSelf
+
+const (
+	TOKEN_ADJUST_PRIVILEGES = 0x0020
+	SE_PRIVILEGE_ENABLED    = 0x00000002
+)
+
+type LUID struct {
+	LowPart  uint32
+	HighPart int32
+}
+
+type LUID_AND_ATTRIBUTES struct {
+	Luid       LUID
+	Attributes uint32
+}
+
+type TOKEN_PRIVILEGES struct {
+	PrivilegeCount uint32
+	Privileges     [1]LUID_AND_ATTRIBUTES
+}
+
+//sys	OpenThreadToken(h syscall.Handle, access uint32, openasself bool, token *syscall.Token) (err error) = advapi32.OpenThreadToken
+//sys	LookupPrivilegeValue(systemname *uint16, name *uint16, luid *LUID) (err error) = advapi32.LookupPrivilegeValueW
+//sys	adjustTokenPrivileges(token syscall.Token, disableAllPrivileges bool, newstate *TOKEN_PRIVILEGES, buflen uint32, prevstate *TOKEN_PRIVILEGES, returnlen *uint32) (ret uint32, err error) [true] = advapi32.AdjustTokenPrivileges
+
+func AdjustTokenPrivileges(token syscall.Token, disableAllPrivileges bool, newstate *TOKEN_PRIVILEGES, buflen uint32, prevstate *TOKEN_PRIVILEGES, returnlen *uint32) error {
+	ret, err := adjustTokenPrivileges(token, disableAllPrivileges, newstate, buflen, prevstate, returnlen)
+	if ret == 0 {
+		// AdjustTokenPrivileges call failed
+		return err
+	}
+	// AdjustTokenPrivileges call succeeded
+	if err == syscall.EINVAL {
+		// GetLastError returned ERROR_SUCCESS
+		return nil
+	}
+	return err
+}
+
+//sys DuplicateTokenEx(hExistingToken syscall.Token, dwDesiredAccess uint32, lpTokenAttributes *syscall.SecurityAttributes, impersonationLevel uint32, tokenType TokenType, phNewToken *syscall.Token) (err error) = advapi32.DuplicateTokenEx
+//sys SetTokenInformation(tokenHandle syscall.Token, tokenInformationClass uint32, tokenInformation uintptr, tokenInformationLength uint32) (err error) = advapi32.SetTokenInformation
+
+type SID_AND_ATTRIBUTES struct {
+	Sid        *syscall.SID
+	Attributes uint32
+}
+
+type TOKEN_MANDATORY_LABEL struct {
+	Label SID_AND_ATTRIBUTES
+}
+
+func (tml *TOKEN_MANDATORY_LABEL) Size() uint32 {
+	return uint32(unsafe.Sizeof(TOKEN_MANDATORY_LABEL{})) + syscall.GetLengthSid(tml.Label.Sid)
+}
+
+const SE_GROUP_INTEGRITY = 0x00000020
+
+type TokenType uint32
+
+const (
+	TokenPrimary       TokenType = 1
+	TokenImpersonation TokenType = 2
+)
+
+//sys	GetProfilesDirectory(dir *uint16, dirLen *uint32) (err error) = userenv.GetProfilesDirectoryW
+
+const (
+	LG_INCLUDE_INDIRECT  = 0x1
+	MAX_PREFERRED_LENGTH = 0xFFFFFFFF
+)
+
+type LocalGroupUserInfo0 struct {
+	Name *uint16
+}
+
+type UserInfo4 struct {
+	Name            *uint16
+	Password        *uint16
+	PasswordAge     uint32
+	Priv            uint32
+	HomeDir         *uint16
+	Comment         *uint16
+	Flags           uint32
+	ScriptPath      *uint16
+	AuthFlags       uint32
+	FullName        *uint16
+	UsrComment      *uint16
+	Parms           *uint16
+	Workstations    *uint16
+	LastLogon       uint32
+	LastLogoff      uint32
+	AcctExpires     uint32
+	MaxStorage      uint32
+	UnitsPerWeek    uint32
+	LogonHours      *byte
+	BadPwCount      uint32
+	NumLogons       uint32
+	LogonServer     *uint16
+	CountryCode     uint32
+	CodePage        uint32
+	UserSid         *syscall.SID
+	PrimaryGroupID  uint32
+	Profile         *uint16
+	HomeDirDrive    *uint16
+	PasswordExpired uint32
+}
+
+//sys	NetUserGetLocalGroups(serverName *uint16, userName *uint16, level uint32, flags uint32, buf **byte, prefMaxLen uint32, entriesRead *uint32, totalEntries *uint32) (neterr error) = netapi32.NetUserGetLocalGroups
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/symlink_windows.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/symlink_windows.go
new file mode 100644
index 000000000..b64d058d1
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/symlink_windows.go
@@ -0,0 +1,39 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+import "syscall"
+
+const (
+	ERROR_INVALID_PARAMETER syscall.Errno = 87
+
+	// symlink support for CreateSymbolicLink() starting with Windows 10 (1703, v10.0.14972)
+	SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE = 0x2
+
+	// FileInformationClass values
+	FileBasicInfo                  = 0    // FILE_BASIC_INFO
+	FileStandardInfo               = 1    // FILE_STANDARD_INFO
+	FileNameInfo                   = 2    // FILE_NAME_INFO
+	FileStreamInfo                 = 7    // FILE_STREAM_INFO
+	FileCompressionInfo            = 8    // FILE_COMPRESSION_INFO
+	FileAttributeTagInfo           = 9    // FILE_ATTRIBUTE_TAG_INFO
+	FileIdBothDirectoryInfo        = 0xa  // FILE_ID_BOTH_DIR_INFO
+	FileIdBothDirectoryRestartInfo = 0xb  // FILE_ID_BOTH_DIR_INFO
+	FileRemoteProtocolInfo         = 0xd  // FILE_REMOTE_PROTOCOL_INFO
+	FileFullDirectoryInfo          = 0xe  // FILE_FULL_DIR_INFO
+	FileFullDirectoryRestartInfo   = 0xf  // FILE_FULL_DIR_INFO
+	FileStorageInfo                = 0x10 // FILE_STORAGE_INFO
+	FileAlignmentInfo              = 0x11 // FILE_ALIGNMENT_INFO
+	FileIdInfo                     = 0x12 // FILE_ID_INFO
+	FileIdExtdDirectoryInfo        = 0x13 // FILE_ID_EXTD_DIR_INFO
+	FileIdExtdDirectoryRestartInfo = 0x14 // FILE_ID_EXTD_DIR_INFO
+)
+
+type FILE_ATTRIBUTE_TAG_INFO struct {
+	FileAttributes uint32
+	ReparseTag     uint32
+}
+
+//sys	GetFileInformationByHandleEx(handle syscall.Handle, class uint32, info *byte, bufsize uint32) (err error)
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/syscall_windows.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/syscall_windows.go
new file mode 100644
index 000000000..121132f6f
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/syscall_windows.go
@@ -0,0 +1,307 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package windows
+
+import (
+	"sync"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	ERROR_SHARING_VIOLATION      syscall.Errno = 32
+	ERROR_LOCK_VIOLATION         syscall.Errno = 33
+	ERROR_NOT_SUPPORTED          syscall.Errno = 50
+	ERROR_CALL_NOT_IMPLEMENTED   syscall.Errno = 120
+	ERROR_INVALID_NAME           syscall.Errno = 123
+	ERROR_LOCK_FAILED            syscall.Errno = 167
+	ERROR_NO_UNICODE_TRANSLATION syscall.Errno = 1113
+)
+
+const GAA_FLAG_INCLUDE_PREFIX = 0x00000010
+
+const (
+	IF_TYPE_OTHER              = 1
+	IF_TYPE_ETHERNET_CSMACD    = 6
+	IF_TYPE_ISO88025_TOKENRING = 9
+	IF_TYPE_PPP                = 23
+	IF_TYPE_SOFTWARE_LOOPBACK  = 24
+	IF_TYPE_ATM                = 37
+	IF_TYPE_IEEE80211          = 71
+	IF_TYPE_TUNNEL             = 131
+	IF_TYPE_IEEE1394           = 144
+)
+
+type SocketAddress struct {
+	Sockaddr       *syscall.RawSockaddrAny
+	SockaddrLength int32
+}
+
+type IpAdapterUnicastAddress struct {
+	Length             uint32
+	Flags              uint32
+	Next               *IpAdapterUnicastAddress
+	Address            SocketAddress
+	PrefixOrigin       int32
+	SuffixOrigin       int32
+	DadState           int32
+	ValidLifetime      uint32
+	PreferredLifetime  uint32
+	LeaseLifetime      uint32
+	OnLinkPrefixLength uint8
+}
+
+type IpAdapterAnycastAddress struct {
+	Length  uint32
+	Flags   uint32
+	Next    *IpAdapterAnycastAddress
+	Address SocketAddress
+}
+
+type IpAdapterMulticastAddress struct {
+	Length  uint32
+	Flags   uint32
+	Next    *IpAdapterMulticastAddress
+	Address SocketAddress
+}
+
+type IpAdapterDnsServerAdapter struct {
+	Length   uint32
+	Reserved uint32
+	Next     *IpAdapterDnsServerAdapter
+	Address  SocketAddress
+}
+
+type IpAdapterPrefix struct {
+	Length       uint32
+	Flags        uint32
+	Next         *IpAdapterPrefix
+	Address      SocketAddress
+	PrefixLength uint32
+}
+
+type IpAdapterAddresses struct {
+	Length                uint32
+	IfIndex               uint32
+	Next                  *IpAdapterAddresses
+	AdapterName           *byte
+	FirstUnicastAddress   *IpAdapterUnicastAddress
+	FirstAnycastAddress   *IpAdapterAnycastAddress
+	FirstMulticastAddress *IpAdapterMulticastAddress
+	FirstDnsServerAddress *IpAdapterDnsServerAdapter
+	DnsSuffix             *uint16
+	Description           *uint16
+	FriendlyName          *uint16
+	PhysicalAddress       [syscall.MAX_ADAPTER_ADDRESS_LENGTH]byte
+	PhysicalAddressLength uint32
+	Flags                 uint32
+	Mtu                   uint32
+	IfType                uint32
+	OperStatus            uint32
+	Ipv6IfIndex           uint32
+	ZoneIndices           [16]uint32
+	FirstPrefix           *IpAdapterPrefix
+	/* more fields might be present here. */
+}
+
+const (
+	IfOperStatusUp             = 1
+	IfOperStatusDown           = 2
+	IfOperStatusTesting        = 3
+	IfOperStatusUnknown        = 4
+	IfOperStatusDormant        = 5
+	IfOperStatusNotPresent     = 6
+	IfOperStatusLowerLayerDown = 7
+)
+
+//sys	GetAdaptersAddresses(family uint32, flags uint32, reserved uintptr, adapterAddresses *IpAdapterAddresses, sizePointer *uint32) (errcode error) = iphlpapi.GetAdaptersAddresses
+//sys	GetComputerNameEx(nameformat uint32, buf *uint16, n *uint32) (err error) = GetComputerNameExW
+//sys	MoveFileEx(from *uint16, to *uint16, flags uint32) (err error) = MoveFileExW
+//sys	GetModuleFileName(module syscall.Handle, fn *uint16, len uint32) (n uint32, err error) = kernel32.GetModuleFileNameW
+
+const (
+	WSA_FLAG_OVERLAPPED        = 0x01
+	WSA_FLAG_NO_HANDLE_INHERIT = 0x80
+
+	WSAEMSGSIZE syscall.Errno = 10040
+
+	MSG_PEEK   = 0x2
+	MSG_TRUNC  = 0x0100
+	MSG_CTRUNC = 0x0200
+
+	socket_error = uintptr(^uint32(0))
+)
+
+var WSAID_WSASENDMSG = syscall.GUID{
+	Data1: 0xa441e712,
+	Data2: 0x754f,
+	Data3: 0x43ca,
+	Data4: [8]byte{0x84, 0xa7, 0x0d, 0xee, 0x44, 0xcf, 0x60, 0x6d},
+}
+
+var WSAID_WSARECVMSG = syscall.GUID{
+	Data1: 0xf689d7c8,
+	Data2: 0x6f1f,
+	Data3: 0x436b,
+	Data4: [8]byte{0x8a, 0x53, 0xe5, 0x4f, 0xe3, 0x51, 0xc3, 0x22},
+}
+
+var sendRecvMsgFunc struct {
+	once     sync.Once
+	sendAddr uintptr
+	recvAddr uintptr
+	err      error
+}
+
+type WSAMsg struct {
+	Name        *syscall.RawSockaddrAny
+	Namelen     int32
+	Buffers     *syscall.WSABuf
+	BufferCount uint32
+	Control     syscall.WSABuf
+	Flags       uint32
+}
+
+//sys	WSASocket(af int32, typ int32, protocol int32, protinfo *syscall.WSAProtocolInfo, group uint32, flags uint32) (handle syscall.Handle, err error) [failretval==syscall.InvalidHandle] = ws2_32.WSASocketW
+
+func loadWSASendRecvMsg() error {
+	sendRecvMsgFunc.once.Do(func() {
+		var s syscall.Handle
+		s, sendRecvMsgFunc.err = syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
+		if sendRecvMsgFunc.err != nil {
+			return
+		}
+		defer syscall.CloseHandle(s)
+		var n uint32
+		sendRecvMsgFunc.err = syscall.WSAIoctl(s,
+			syscall.SIO_GET_EXTENSION_FUNCTION_POINTER,
+			(*byte)(unsafe.Pointer(&WSAID_WSARECVMSG)),
+			uint32(unsafe.Sizeof(WSAID_WSARECVMSG)),
+			(*byte)(unsafe.Pointer(&sendRecvMsgFunc.recvAddr)),
+			uint32(unsafe.Sizeof(sendRecvMsgFunc.recvAddr)),
+			&n, nil, 0)
+		if sendRecvMsgFunc.err != nil {
+			return
+		}
+		sendRecvMsgFunc.err = syscall.WSAIoctl(s,
+			syscall.SIO_GET_EXTENSION_FUNCTION_POINTER,
+			(*byte)(unsafe.Pointer(&WSAID_WSASENDMSG)),
+			uint32(unsafe.Sizeof(WSAID_WSASENDMSG)),
+			(*byte)(unsafe.Pointer(&sendRecvMsgFunc.sendAddr)),
+			uint32(unsafe.Sizeof(sendRecvMsgFunc.sendAddr)),
+			&n, nil, 0)
+	})
+	return sendRecvMsgFunc.err
+}
+
+func WSASendMsg(fd syscall.Handle, msg *WSAMsg, flags uint32, bytesSent *uint32, overlapped *syscall.Overlapped, croutine *byte) error {
+	err := loadWSASendRecvMsg()
+	if err != nil {
+		return err
+	}
+	r1, _, e1 := syscall.Syscall6(sendRecvMsgFunc.sendAddr, 6, uintptr(fd), uintptr(unsafe.Pointer(msg)), uintptr(flags), uintptr(unsafe.Pointer(bytesSent)), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)))
+	if r1 == socket_error {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return err
+}
+
+func WSARecvMsg(fd syscall.Handle, msg *WSAMsg, bytesReceived *uint32, overlapped *syscall.Overlapped, croutine *byte) error {
+	err := loadWSASendRecvMsg()
+	if err != nil {
+		return err
+	}
+	r1, _, e1 := syscall.Syscall6(sendRecvMsgFunc.recvAddr, 5, uintptr(fd), uintptr(unsafe.Pointer(msg)), uintptr(unsafe.Pointer(bytesReceived)), uintptr(unsafe.Pointer(overlapped)), uintptr(unsafe.Pointer(croutine)), 0)
+	if r1 == socket_error {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return err
+}
+
+const (
+	ComputerNameNetBIOS                   = 0
+	ComputerNameDnsHostname               = 1
+	ComputerNameDnsDomain                 = 2
+	ComputerNameDnsFullyQualified         = 3
+	ComputerNamePhysicalNetBIOS           = 4
+	ComputerNamePhysicalDnsHostname       = 5
+	ComputerNamePhysicalDnsDomain         = 6
+	ComputerNamePhysicalDnsFullyQualified = 7
+	ComputerNameMax                       = 8
+
+	MOVEFILE_REPLACE_EXISTING      = 0x1
+	MOVEFILE_COPY_ALLOWED          = 0x2
+	MOVEFILE_DELAY_UNTIL_REBOOT    = 0x4
+	MOVEFILE_WRITE_THROUGH         = 0x8
+	MOVEFILE_CREATE_HARDLINK       = 0x10
+	MOVEFILE_FAIL_IF_NOT_TRACKABLE = 0x20
+)
+
+func Rename(oldpath, newpath string) error {
+	from, err := syscall.UTF16PtrFromString(oldpath)
+	if err != nil {
+		return err
+	}
+	to, err := syscall.UTF16PtrFromString(newpath)
+	if err != nil {
+		return err
+	}
+	return MoveFileEx(from, to, MOVEFILE_REPLACE_EXISTING)
+}
+
+//sys LockFileEx(file syscall.Handle, flags uint32, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *syscall.Overlapped) (err error) = kernel32.LockFileEx
+//sys UnlockFileEx(file syscall.Handle, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *syscall.Overlapped) (err error) = kernel32.UnlockFileEx
+
+const (
+	LOCKFILE_FAIL_IMMEDIATELY = 0x00000001
+	LOCKFILE_EXCLUSIVE_LOCK   = 0x00000002
+)
+
+const MB_ERR_INVALID_CHARS = 8
+
+//sys	GetACP() (acp uint32) = kernel32.GetACP
+//sys	GetConsoleCP() (ccp uint32) = kernel32.GetConsoleCP
+//sys	MultiByteToWideChar(codePage uint32, dwFlags uint32, str *byte, nstr int32, wchar *uint16, nwchar int32) (nwrite int32, err error) = kernel32.MultiByteToWideChar
+//sys	GetCurrentThread() (pseudoHandle syscall.Handle, err error) = kernel32.GetCurrentThread
+
+const STYPE_DISKTREE = 0x00
+
+type SHARE_INFO_2 struct {
+	Netname     *uint16
+	Type        uint32
+	Remark      *uint16
+	Permissions uint32
+	MaxUses     uint32
+	CurrentUses uint32
+	Path        *uint16
+	Passwd      *uint16
+}
+
+//sys  NetShareAdd(serverName *uint16, level uint32, buf *byte, parmErr *uint16) (neterr error) = netapi32.NetShareAdd
+//sys  NetShareDel(serverName *uint16, netName *uint16, reserved uint32) (neterr error) = netapi32.NetShareDel
+
+const (
+	FILE_NAME_NORMALIZED = 0x0
+	FILE_NAME_OPENED     = 0x8
+
+	VOLUME_NAME_DOS  = 0x0
+	VOLUME_NAME_GUID = 0x1
+	VOLUME_NAME_NONE = 0x4
+	VOLUME_NAME_NT   = 0x2
+)
+
+//sys	GetFinalPathNameByHandle(file syscall.Handle, filePath *uint16, filePathSize uint32, flags uint32) (n uint32, err error) = kernel32.GetFinalPathNameByHandleW
+
+func LoadGetFinalPathNameByHandle() error {
+	return procGetFinalPathNameByHandleW.Find()
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/sysdll/sysdll.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/sysdll/sysdll.go
new file mode 100644
index 000000000..4e0018f38
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/sysdll/sysdll.go
@@ -0,0 +1,28 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sysdll is an internal leaf package that records and reports
+// which Windows DLL names are used by Go itself. These DLLs are then
+// only loaded from the System32 directory. See Issue 14959.
+package sysdll
+
+// IsSystemDLL reports whether the named dll key (a base name, like
+// "foo.dll") is a system DLL which should only be loaded from the
+// Windows SYSTEM32 directory.
+//
+// Filenames are case sensitive, but that doesn't matter because
+// the case registered with Add is also the same case used with
+// LoadDLL later.
+//
+// It has no associated mutex and should only be mutated serially
+// (currently: during init), and not concurrent with DLL loading.
+var IsSystemDLL = map[string]bool{}
+
+// Add notes that dll is a system32 DLL which should only be loaded
+// from the Windows SYSTEM32 directory. It returns its argument back,
+// for ease of use in generated code.
+func Add(dll string) string {
+	IsSystemDLL[dll] = true
+	return dll
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/zsyscall_windows.go b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/zsyscall_windows.go
new file mode 100644
index 000000000..3ed2d9fe0
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/internal/syscall/windows/zsyscall_windows.go
@@ -0,0 +1,363 @@
+// Code generated by 'go generate'; DO NOT EDIT.
+
+package windows
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/rogpeppe/go-internal/internal/syscall/windows/sysdll"
+)
+
+var _ unsafe.Pointer
+
+// Do the interface allocations only once for common
+// Errno values.
+const (
+	errnoERROR_IO_PENDING = 997
+)
+
+var (
+	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case errnoERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
+
+var (
+	modiphlpapi = syscall.NewLazyDLL(sysdll.Add("iphlpapi.dll"))
+	modkernel32 = syscall.NewLazyDLL(sysdll.Add("kernel32.dll"))
+	modws2_32   = syscall.NewLazyDLL(sysdll.Add("ws2_32.dll"))
+	modnetapi32 = syscall.NewLazyDLL(sysdll.Add("netapi32.dll"))
+	modadvapi32 = syscall.NewLazyDLL(sysdll.Add("advapi32.dll"))
+	moduserenv  = syscall.NewLazyDLL(sysdll.Add("userenv.dll"))
+	modpsapi    = syscall.NewLazyDLL(sysdll.Add("psapi.dll"))
+
+	procGetAdaptersAddresses         = modiphlpapi.NewProc("GetAdaptersAddresses")
+	procGetComputerNameExW           = modkernel32.NewProc("GetComputerNameExW")
+	procMoveFileExW                  = modkernel32.NewProc("MoveFileExW")
+	procGetModuleFileNameW           = modkernel32.NewProc("GetModuleFileNameW")
+	procWSASocketW                   = modws2_32.NewProc("WSASocketW")
+	procLockFileEx                   = modkernel32.NewProc("LockFileEx")
+	procUnlockFileEx                 = modkernel32.NewProc("UnlockFileEx")
+	procGetACP                       = modkernel32.NewProc("GetACP")
+	procGetConsoleCP                 = modkernel32.NewProc("GetConsoleCP")
+	procMultiByteToWideChar          = modkernel32.NewProc("MultiByteToWideChar")
+	procGetCurrentThread             = modkernel32.NewProc("GetCurrentThread")
+	procNetShareAdd                  = modnetapi32.NewProc("NetShareAdd")
+	procNetShareDel                  = modnetapi32.NewProc("NetShareDel")
+	procGetFinalPathNameByHandleW    = modkernel32.NewProc("GetFinalPathNameByHandleW")
+	procImpersonateSelf              = modadvapi32.NewProc("ImpersonateSelf")
+	procRevertToSelf                 = modadvapi32.NewProc("RevertToSelf")
+	procOpenThreadToken              = modadvapi32.NewProc("OpenThreadToken")
+	procLookupPrivilegeValueW        = modadvapi32.NewProc("LookupPrivilegeValueW")
+	procAdjustTokenPrivileges        = modadvapi32.NewProc("AdjustTokenPrivileges")
+	procDuplicateTokenEx             = modadvapi32.NewProc("DuplicateTokenEx")
+	procSetTokenInformation          = modadvapi32.NewProc("SetTokenInformation")
+	procGetProfilesDirectoryW        = moduserenv.NewProc("GetProfilesDirectoryW")
+	procNetUserGetLocalGroups        = modnetapi32.NewProc("NetUserGetLocalGroups")
+	procGetProcessMemoryInfo         = modpsapi.NewProc("GetProcessMemoryInfo")
+	procGetFileInformationByHandleEx = modkernel32.NewProc("GetFileInformationByHandleEx")
+)
+
+func GetAdaptersAddresses(family uint32, flags uint32, reserved uintptr, adapterAddresses *IpAdapterAddresses, sizePointer *uint32) (errcode error) {
+	r0, _, _ := syscall.Syscall6(procGetAdaptersAddresses.Addr(), 5, uintptr(family), uintptr(flags), uintptr(reserved), uintptr(unsafe.Pointer(adapterAddresses)), uintptr(unsafe.Pointer(sizePointer)), 0)
+	if r0 != 0 {
+		errcode = syscall.Errno(r0)
+	}
+	return
+}
+
+func GetComputerNameEx(nameformat uint32, buf *uint16, n *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procGetComputerNameExW.Addr(), 3, uintptr(nameformat), uintptr(unsafe.Pointer(buf)), uintptr(unsafe.Pointer(n)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func MoveFileEx(from *uint16, to *uint16, flags uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procMoveFileExW.Addr(), 3, uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(to)), uintptr(flags))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func GetModuleFileName(module syscall.Handle, fn *uint16, len uint32) (n uint32, err error) {
+	r0, _, e1 := syscall.Syscall(procGetModuleFileNameW.Addr(), 3, uintptr(module), uintptr(unsafe.Pointer(fn)), uintptr(len))
+	n = uint32(r0)
+	if n == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func WSASocket(af int32, typ int32, protocol int32, protinfo *syscall.WSAProtocolInfo, group uint32, flags uint32) (handle syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall6(procWSASocketW.Addr(), 6, uintptr(af), uintptr(typ), uintptr(protocol), uintptr(unsafe.Pointer(protinfo)), uintptr(group), uintptr(flags))
+	handle = syscall.Handle(r0)
+	if handle == syscall.InvalidHandle {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func LockFileEx(file syscall.Handle, flags uint32, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *syscall.Overlapped) (err error) {
+	r1, _, e1 := syscall.Syscall6(procLockFileEx.Addr(), 6, uintptr(file), uintptr(flags), uintptr(reserved), uintptr(bytesLow), uintptr(bytesHigh), uintptr(unsafe.Pointer(overlapped)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func UnlockFileEx(file syscall.Handle, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *syscall.Overlapped) (err error) {
+	r1, _, e1 := syscall.Syscall6(procUnlockFileEx.Addr(), 5, uintptr(file), uintptr(reserved), uintptr(bytesLow), uintptr(bytesHigh), uintptr(unsafe.Pointer(overlapped)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func GetACP() (acp uint32) {
+	r0, _, _ := syscall.Syscall(procGetACP.Addr(), 0, 0, 0, 0)
+	acp = uint32(r0)
+	return
+}
+
+func GetConsoleCP() (ccp uint32) {
+	r0, _, _ := syscall.Syscall(procGetConsoleCP.Addr(), 0, 0, 0, 0)
+	ccp = uint32(r0)
+	return
+}
+
+func MultiByteToWideChar(codePage uint32, dwFlags uint32, str *byte, nstr int32, wchar *uint16, nwchar int32) (nwrite int32, err error) {
+	r0, _, e1 := syscall.Syscall6(procMultiByteToWideChar.Addr(), 6, uintptr(codePage), uintptr(dwFlags), uintptr(unsafe.Pointer(str)), uintptr(nstr), uintptr(unsafe.Pointer(wchar)), uintptr(nwchar))
+	nwrite = int32(r0)
+	if nwrite == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func GetCurrentThread() (pseudoHandle syscall.Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procGetCurrentThread.Addr(), 0, 0, 0, 0)
+	pseudoHandle = syscall.Handle(r0)
+	if pseudoHandle == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func NetShareAdd(serverName *uint16, level uint32, buf *byte, parmErr *uint16) (neterr error) {
+	r0, _, _ := syscall.Syscall6(procNetShareAdd.Addr(), 4, uintptr(unsafe.Pointer(serverName)), uintptr(level), uintptr(unsafe.Pointer(buf)), uintptr(unsafe.Pointer(parmErr)), 0, 0)
+	if r0 != 0 {
+		neterr = syscall.Errno(r0)
+	}
+	return
+}
+
+func NetShareDel(serverName *uint16, netName *uint16, reserved uint32) (neterr error) {
+	r0, _, _ := syscall.Syscall(procNetShareDel.Addr(), 3, uintptr(unsafe.Pointer(serverName)), uintptr(unsafe.Pointer(netName)), uintptr(reserved))
+	if r0 != 0 {
+		neterr = syscall.Errno(r0)
+	}
+	return
+}
+
+func GetFinalPathNameByHandle(file syscall.Handle, filePath *uint16, filePathSize uint32, flags uint32) (n uint32, err error) {
+	r0, _, e1 := syscall.Syscall6(procGetFinalPathNameByHandleW.Addr(), 4, uintptr(file), uintptr(unsafe.Pointer(filePath)), uintptr(filePathSize), uintptr(flags), 0, 0)
+	n = uint32(r0)
+	if n == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func ImpersonateSelf(impersonationlevel uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procImpersonateSelf.Addr(), 1, uintptr(impersonationlevel), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func RevertToSelf() (err error) {
+	r1, _, e1 := syscall.Syscall(procRevertToSelf.Addr(), 0, 0, 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func OpenThreadToken(h syscall.Handle, access uint32, openasself bool, token *syscall.Token) (err error) {
+	var _p0 uint32
+	if openasself {
+		_p0 = 1
+	} else {
+		_p0 = 0
+	}
+	r1, _, e1 := syscall.Syscall6(procOpenThreadToken.Addr(), 4, uintptr(h), uintptr(access), uintptr(_p0), uintptr(unsafe.Pointer(token)), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func LookupPrivilegeValue(systemname *uint16, name *uint16, luid *LUID) (err error) {
+	r1, _, e1 := syscall.Syscall(procLookupPrivilegeValueW.Addr(), 3, uintptr(unsafe.Pointer(systemname)), uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(luid)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func adjustTokenPrivileges(token syscall.Token, disableAllPrivileges bool, newstate *TOKEN_PRIVILEGES, buflen uint32, prevstate *TOKEN_PRIVILEGES, returnlen *uint32) (ret uint32, err error) {
+	var _p0 uint32
+	if disableAllPrivileges {
+		_p0 = 1
+	} else {
+		_p0 = 0
+	}
+	r0, _, e1 := syscall.Syscall6(procAdjustTokenPrivileges.Addr(), 6, uintptr(token), uintptr(_p0), uintptr(unsafe.Pointer(newstate)), uintptr(buflen), uintptr(unsafe.Pointer(prevstate)), uintptr(unsafe.Pointer(returnlen)))
+	ret = uint32(r0)
+	if true {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func DuplicateTokenEx(hExistingToken syscall.Token, dwDesiredAccess uint32, lpTokenAttributes *syscall.SecurityAttributes, impersonationLevel uint32, tokenType TokenType, phNewToken *syscall.Token) (err error) {
+	r1, _, e1 := syscall.Syscall6(procDuplicateTokenEx.Addr(), 6, uintptr(hExistingToken), uintptr(dwDesiredAccess), uintptr(unsafe.Pointer(lpTokenAttributes)), uintptr(impersonationLevel), uintptr(tokenType), uintptr(unsafe.Pointer(phNewToken)))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func SetTokenInformation(tokenHandle syscall.Token, tokenInformationClass uint32, tokenInformation uintptr, tokenInformationLength uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procSetTokenInformation.Addr(), 4, uintptr(tokenHandle), uintptr(tokenInformationClass), uintptr(tokenInformation), uintptr(tokenInformationLength), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func GetProfilesDirectory(dir *uint16, dirLen *uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procGetProfilesDirectoryW.Addr(), 2, uintptr(unsafe.Pointer(dir)), uintptr(unsafe.Pointer(dirLen)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func NetUserGetLocalGroups(serverName *uint16, userName *uint16, level uint32, flags uint32, buf **byte, prefMaxLen uint32, entriesRead *uint32, totalEntries *uint32) (neterr error) {
+	r0, _, _ := syscall.Syscall9(procNetUserGetLocalGroups.Addr(), 8, uintptr(unsafe.Pointer(serverName)), uintptr(unsafe.Pointer(userName)), uintptr(level), uintptr(flags), uintptr(unsafe.Pointer(buf)), uintptr(prefMaxLen), uintptr(unsafe.Pointer(entriesRead)), uintptr(unsafe.Pointer(totalEntries)), 0)
+	if r0 != 0 {
+		neterr = syscall.Errno(r0)
+	}
+	return
+}
+
+func GetProcessMemoryInfo(handle syscall.Handle, memCounters *PROCESS_MEMORY_COUNTERS, cb uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procGetProcessMemoryInfo.Addr(), 3, uintptr(handle), uintptr(unsafe.Pointer(memCounters)), uintptr(cb))
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func GetFileInformationByHandleEx(handle syscall.Handle, class uint32, info *byte, bufsize uint32) (err error) {
+	r1, _, e1 := syscall.Syscall6(procGetFileInformationByHandleEx.Addr(), 4, uintptr(handle), uintptr(class), uintptr(unsafe.Pointer(info)), uintptr(bufsize), 0, 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock.go
new file mode 100644
index 000000000..05f27c321
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock.go
@@ -0,0 +1,99 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package filelock provides a platform-independent API for advisory file
+// locking. Calls to functions in this package on platforms that do not support
+// advisory locks will return errors for which IsNotSupported returns true.
+package filelock
+
+import (
+	"errors"
+	"io/fs"
+	"os"
+)
+
+// A File provides the minimal set of methods required to lock an open file.
+// File implementations must be usable as map keys.
+// The usual implementation is *os.File.
+type File interface {
+	// Name returns the name of the file.
+	Name() string
+
+	// Fd returns a valid file descriptor.
+	// (If the File is an *os.File, it must not be closed.)
+	Fd() uintptr
+
+	// Stat returns the FileInfo structure describing file.
+	Stat() (fs.FileInfo, error)
+}
+
+// Lock places an advisory write lock on the file, blocking until it can be
+// locked.
+//
+// If Lock returns nil, no other process will be able to place a read or write
+// lock on the file until this process exits, closes f, or calls Unlock on it.
+//
+// If f's descriptor is already read- or write-locked, the behavior of Lock is
+// unspecified.
+//
+// Closing the file may or may not release the lock promptly. Callers should
+// ensure that Unlock is always called when Lock succeeds.
+func Lock(f File) error {
+	return lock(f, writeLock)
+}
+
+// RLock places an advisory read lock on the file, blocking until it can be locked.
+//
+// If RLock returns nil, no other process will be able to place a write lock on
+// the file until this process exits, closes f, or calls Unlock on it.
+//
+// If f is already read- or write-locked, the behavior of RLock is unspecified.
+//
+// Closing the file may or may not release the lock promptly. Callers should
+// ensure that Unlock is always called if RLock succeeds.
+func RLock(f File) error {
+	return lock(f, readLock)
+}
+
+// Unlock removes an advisory lock placed on f by this process.
+//
+// The caller must not attempt to unlock a file that is not locked.
+func Unlock(f File) error {
+	return unlock(f)
+}
+
+// String returns the name of the function corresponding to lt
+// (Lock, RLock, or Unlock).
+func (lt lockType) String() string {
+	switch lt {
+	case readLock:
+		return "RLock"
+	case writeLock:
+		return "Lock"
+	default:
+		return "Unlock"
+	}
+}
+
+// IsNotSupported returns a boolean indicating whether the error is known to
+// report that a function is not supported (possibly for a specific input).
+// It is satisfied by ErrNotSupported as well as some syscall errors.
+func IsNotSupported(err error) bool {
+	return isNotSupported(underlyingError(err))
+}
+
+var ErrNotSupported = errors.New("operation not supported")
+
+// underlyingError returns the underlying error for known os error types.
+func underlyingError(err error) error {
+	switch err := err.(type) {
+	case *fs.PathError:
+		return err.Err
+	case *os.LinkError:
+		return err.Err
+	case *os.SyscallError:
+		return err.Err
+	}
+	return err
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_fcntl.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_fcntl.go
new file mode 100644
index 000000000..856804850
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_fcntl.go
@@ -0,0 +1,214 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || (solaris && !illumos)
+
+// This code implements the filelock API using POSIX 'fcntl' locks, which attach
+// to an (inode, process) pair rather than a file descriptor. To avoid unlocking
+// files prematurely when the same file is opened through different descriptors,
+// we allow only one read-lock at a time.
+//
+// Most platforms provide some alternative API, such as an 'flock' system call
+// or an F_OFD_SETLK command for 'fcntl', that allows for better concurrency and
+// does not require per-inode bookkeeping in the application.
+
+package filelock
+
+import (
+	"errors"
+	"io"
+	"io/fs"
+	"math/rand"
+	"sync"
+	"syscall"
+	"time"
+)
+
+type lockType int16
+
+const (
+	readLock  lockType = syscall.F_RDLCK
+	writeLock lockType = syscall.F_WRLCK
+)
+
+type inode = uint64 // type of syscall.Stat_t.Ino
+
+type inodeLock struct {
+	owner File
+	queue []<-chan File
+}
+
+var (
+	mu     sync.Mutex
+	inodes = map[File]inode{}
+	locks  = map[inode]inodeLock{}
+)
+
+func lock(f File, lt lockType) (err error) {
+	// POSIX locks apply per inode and process, and the lock for an inode is
+	// released when *any* descriptor for that inode is closed. So we need to
+	// synchronize access to each inode internally, and must serialize lock and
+	// unlock calls that refer to the same inode through different descriptors.
+	fi, err := f.Stat()
+	if err != nil {
+		return err
+	}
+	ino := fi.Sys().(*syscall.Stat_t).Ino
+
+	mu.Lock()
+	if i, dup := inodes[f]; dup && i != ino {
+		mu.Unlock()
+		return &fs.PathError{
+			Op:   lt.String(),
+			Path: f.Name(),
+			Err:  errors.New("inode for file changed since last Lock or RLock"),
+		}
+	}
+	inodes[f] = ino
+
+	var wait chan File
+	l := locks[ino]
+	if l.owner == f {
+		// This file already owns the lock, but the call may change its lock type.
+	} else if l.owner == nil {
+		// No owner: it's ours now.
+		l.owner = f
+	} else {
+		// Already owned: add a channel to wait on.
+		wait = make(chan File)
+		l.queue = append(l.queue, wait)
+	}
+	locks[ino] = l
+	mu.Unlock()
+
+	if wait != nil {
+		wait <- f
+	}
+
+	// Spurious EDEADLK errors arise on platforms that compute deadlock graphs at
+	// the process, rather than thread, level. Consider processes P and Q, with
+	// threads P.1, P.2, and Q.3. The following trace is NOT a deadlock, but will be
+	// reported as a deadlock on systems that consider only process granularity:
+	//
+	// 	P.1 locks file A.
+	// 	Q.3 locks file B.
+	// 	Q.3 blocks on file A.
+	// 	P.2 blocks on file B. (This is erroneously reported as a deadlock.)
+	// 	P.1 unlocks file A.
+	// 	Q.3 unblocks and locks file A.
+	// 	Q.3 unlocks files A and B.
+	// 	P.2 unblocks and locks file B.
+	// 	P.2 unlocks file B.
+	//
+	// These spurious errors were observed in practice on AIX and Solaris in
+	// cmd/go: see https://golang.org/issue/32817.
+	//
+	// We work around this bug by treating EDEADLK as always spurious. If there
+	// really is a lock-ordering bug between the interacting processes, it will
+	// become a livelock instead, but that's not appreciably worse than if we had
+	// a proper flock implementation (which generally does not even attempt to
+	// diagnose deadlocks).
+	//
+	// In the above example, that changes the trace to:
+	//
+	// 	P.1 locks file A.
+	// 	Q.3 locks file B.
+	// 	Q.3 blocks on file A.
+	// 	P.2 spuriously fails to lock file B and goes to sleep.
+	// 	P.1 unlocks file A.
+	// 	Q.3 unblocks and locks file A.
+	// 	Q.3 unlocks files A and B.
+	// 	P.2 wakes up and locks file B.
+	// 	P.2 unlocks file B.
+	//
+	// We know that the retry loop will not introduce a *spurious* livelock
+	// because, according to the POSIX specification, EDEADLK is only to be
+	// returned when “the lock is blocked by a lock from another process”.
+	// If that process is blocked on some lock that we are holding, then the
+	// resulting livelock is due to a real deadlock (and would manifest as such
+	// when using, for example, the flock implementation of this package).
+	// If the other process is *not* blocked on some other lock that we are
+	// holding, then it will eventually release the requested lock.
+
+	nextSleep := 1 * time.Millisecond
+	const maxSleep = 500 * time.Millisecond
+	for {
+		err = setlkw(f.Fd(), lt)
+		if err != syscall.EDEADLK {
+			break
+		}
+		time.Sleep(nextSleep)
+
+		nextSleep += nextSleep
+		if nextSleep > maxSleep {
+			nextSleep = maxSleep
+		}
+		// Apply 10% jitter to avoid synchronizing collisions when we finally unblock.
+		nextSleep += time.Duration((0.1*rand.Float64() - 0.05) * float64(nextSleep))
+	}
+
+	if err != nil {
+		unlock(f)
+		return &fs.PathError{
+			Op:   lt.String(),
+			Path: f.Name(),
+			Err:  err,
+		}
+	}
+
+	return nil
+}
+
+func unlock(f File) error {
+	var owner File
+
+	mu.Lock()
+	ino, ok := inodes[f]
+	if ok {
+		owner = locks[ino].owner
+	}
+	mu.Unlock()
+
+	if owner != f {
+		panic("unlock called on a file that is not locked")
+	}
+
+	err := setlkw(f.Fd(), syscall.F_UNLCK)
+
+	mu.Lock()
+	l := locks[ino]
+	if len(l.queue) == 0 {
+		// No waiters: remove the map entry.
+		delete(locks, ino)
+	} else {
+		// The first waiter is sending us their file now.
+		// Receive it and update the queue.
+		l.owner = <-l.queue[0]
+		l.queue = l.queue[1:]
+		locks[ino] = l
+	}
+	delete(inodes, f)
+	mu.Unlock()
+
+	return err
+}
+
+// setlkw calls FcntlFlock with F_SETLKW for the entire file indicated by fd.
+func setlkw(fd uintptr, lt lockType) error {
+	for {
+		err := syscall.FcntlFlock(fd, syscall.F_SETLKW, &syscall.Flock_t{
+			Type:   int16(lt),
+			Whence: io.SeekStart,
+			Start:  0,
+			Len:    0, // All bytes.
+		})
+		if err != syscall.EINTR {
+			return err
+		}
+	}
+}
+
+func isNotSupported(err error) bool {
+	return err == syscall.ENOSYS || err == syscall.ENOTSUP || err == syscall.EOPNOTSUPP || err == ErrNotSupported
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_other.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_other.go
new file mode 100644
index 000000000..7bdd62bd9
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_other.go
@@ -0,0 +1,36 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !unix && !windows
+
+package filelock
+
+import "io/fs"
+
+type lockType int8
+
+const (
+	readLock = iota + 1
+	writeLock
+)
+
+func lock(f File, lt lockType) error {
+	return &fs.PathError{
+		Op:   lt.String(),
+		Path: f.Name(),
+		Err:  ErrNotSupported,
+	}
+}
+
+func unlock(f File) error {
+	return &fs.PathError{
+		Op:   "Unlock",
+		Path: f.Name(),
+		Err:  ErrNotSupported,
+	}
+}
+
+func isNotSupported(err error) bool {
+	return err == ErrNotSupported
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_unix.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_unix.go
new file mode 100644
index 000000000..d7778d05d
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_unix.go
@@ -0,0 +1,44 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || dragonfly || freebsd || illumos || linux || netbsd || openbsd
+
+package filelock
+
+import (
+	"io/fs"
+	"syscall"
+)
+
+type lockType int16
+
+const (
+	readLock  lockType = syscall.LOCK_SH
+	writeLock lockType = syscall.LOCK_EX
+)
+
+func lock(f File, lt lockType) (err error) {
+	for {
+		err = syscall.Flock(int(f.Fd()), int(lt))
+		if err != syscall.EINTR {
+			break
+		}
+	}
+	if err != nil {
+		return &fs.PathError{
+			Op:   lt.String(),
+			Path: f.Name(),
+			Err:  err,
+		}
+	}
+	return nil
+}
+
+func unlock(f File) error {
+	return lock(f, syscall.LOCK_UN)
+}
+
+func isNotSupported(err error) bool {
+	return err == syscall.ENOSYS || err == syscall.ENOTSUP || err == syscall.EOPNOTSUPP || err == ErrNotSupported
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_windows.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_windows.go
new file mode 100644
index 000000000..ceab65b02
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/internal/filelock/filelock_windows.go
@@ -0,0 +1,67 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build windows
+
+package filelock
+
+import (
+	"io/fs"
+	"syscall"
+
+	"github.com/rogpeppe/go-internal/internal/syscall/windows"
+)
+
+type lockType uint32
+
+const (
+	readLock  lockType = 0
+	writeLock lockType = windows.LOCKFILE_EXCLUSIVE_LOCK
+)
+
+const (
+	reserved = 0
+	allBytes = ^uint32(0)
+)
+
+func lock(f File, lt lockType) error {
+	// Per https://golang.org/issue/19098, “Programs currently expect the Fd
+	// method to return a handle that uses ordinary synchronous I/O.”
+	// However, LockFileEx still requires an OVERLAPPED structure,
+	// which contains the file offset of the beginning of the lock range.
+	// We want to lock the entire file, so we leave the offset as zero.
+	ol := new(syscall.Overlapped)
+
+	err := windows.LockFileEx(syscall.Handle(f.Fd()), uint32(lt), reserved, allBytes, allBytes, ol)
+	if err != nil {
+		return &fs.PathError{
+			Op:   lt.String(),
+			Path: f.Name(),
+			Err:  err,
+		}
+	}
+	return nil
+}
+
+func unlock(f File) error {
+	ol := new(syscall.Overlapped)
+	err := windows.UnlockFileEx(syscall.Handle(f.Fd()), reserved, allBytes, allBytes, ol)
+	if err != nil {
+		return &fs.PathError{
+			Op:   "Unlock",
+			Path: f.Name(),
+			Err:  err,
+		}
+	}
+	return nil
+}
+
+func isNotSupported(err error) bool {
+	switch err {
+	case windows.ERROR_NOT_SUPPORTED, windows.ERROR_CALL_NOT_IMPLEMENTED, ErrNotSupported:
+		return true
+	default:
+		return false
+	}
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile.go
new file mode 100644
index 000000000..82e1a8967
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile.go
@@ -0,0 +1,187 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package lockedfile creates and manipulates files whose contents should only
+// change atomically.
+package lockedfile
+
+import (
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"runtime"
+)
+
+// A File is a locked *os.File.
+//
+// Closing the file releases the lock.
+//
+// If the program exits while a file is locked, the operating system releases
+// the lock but may not do so promptly: callers must ensure that all locked
+// files are closed before exiting.
+type File struct {
+	osFile
+	closed bool
+}
+
+// osFile embeds a *os.File while keeping the pointer itself unexported.
+// (When we close a File, it must be the same file descriptor that we opened!)
+type osFile struct {
+	*os.File
+}
+
+// OpenFile is like os.OpenFile, but returns a locked file.
+// If flag includes os.O_WRONLY or os.O_RDWR, the file is write-locked;
+// otherwise, it is read-locked.
+func OpenFile(name string, flag int, perm fs.FileMode) (*File, error) {
+	var (
+		f   = new(File)
+		err error
+	)
+	f.osFile.File, err = openFile(name, flag, perm)
+	if err != nil {
+		return nil, err
+	}
+
+	// Although the operating system will drop locks for open files when the go
+	// command exits, we want to hold locks for as little time as possible, and we
+	// especially don't want to leave a file locked after we're done with it. Our
+	// Close method is what releases the locks, so use a finalizer to report
+	// missing Close calls on a best-effort basis.
+	runtime.SetFinalizer(f, func(f *File) {
+		panic(fmt.Sprintf("lockedfile.File %s became unreachable without a call to Close", f.Name()))
+	})
+
+	return f, nil
+}
+
+// Open is like os.Open, but returns a read-locked file.
+func Open(name string) (*File, error) {
+	return OpenFile(name, os.O_RDONLY, 0)
+}
+
+// Create is like os.Create, but returns a write-locked file.
+func Create(name string) (*File, error) {
+	return OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0666)
+}
+
+// Edit creates the named file with mode 0666 (before umask),
+// but does not truncate existing contents.
+//
+// If Edit succeeds, methods on the returned File can be used for I/O.
+// The associated file descriptor has mode O_RDWR and the file is write-locked.
+func Edit(name string) (*File, error) {
+	return OpenFile(name, os.O_RDWR|os.O_CREATE, 0666)
+}
+
+// Close unlocks and closes the underlying file.
+//
+// Close may be called multiple times; all calls after the first will return a
+// non-nil error.
+func (f *File) Close() error {
+	if f.closed {
+		return &fs.PathError{
+			Op:   "close",
+			Path: f.Name(),
+			Err:  fs.ErrClosed,
+		}
+	}
+	f.closed = true
+
+	err := closeFile(f.osFile.File)
+	runtime.SetFinalizer(f, nil)
+	return err
+}
+
+// Read opens the named file with a read-lock and returns its contents.
+func Read(name string) ([]byte, error) {
+	f, err := Open(name)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	return io.ReadAll(f)
+}
+
+// Write opens the named file (creating it with the given permissions if needed),
+// then write-locks it and overwrites it with the given content.
+func Write(name string, content io.Reader, perm fs.FileMode) (err error) {
+	f, err := OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(f, content)
+	if closeErr := f.Close(); err == nil {
+		err = closeErr
+	}
+	return err
+}
+
+// Transform invokes t with the result of reading the named file, with its lock
+// still held.
+//
+// If t returns a nil error, Transform then writes the returned contents back to
+// the file, making a best effort to preserve existing contents on error.
+//
+// t must not modify the slice passed to it.
+func Transform(name string, t func([]byte) ([]byte, error)) (err error) {
+	f, err := Edit(name)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	old, err := io.ReadAll(f)
+	if err != nil {
+		return err
+	}
+
+	new, err := t(old)
+	if err != nil {
+		return err
+	}
+
+	if len(new) > len(old) {
+		// The overall file size is increasing, so write the tail first: if we're
+		// about to run out of space on the disk, we would rather detect that
+		// failure before we have overwritten the original contents.
+		if _, err := f.WriteAt(new[len(old):], int64(len(old))); err != nil {
+			// Make a best effort to remove the incomplete tail.
+			f.Truncate(int64(len(old)))
+			return err
+		}
+	}
+
+	// We're about to overwrite the old contents. In case of failure, make a best
+	// effort to roll back before we close the file.
+	defer func() {
+		if err != nil {
+			if _, err := f.WriteAt(old, 0); err == nil {
+				f.Truncate(int64(len(old)))
+			}
+		}
+	}()
+
+	if len(new) >= len(old) {
+		if _, err := f.WriteAt(new[:len(old)], 0); err != nil {
+			return err
+		}
+	} else {
+		if _, err := f.WriteAt(new, 0); err != nil {
+			return err
+		}
+		// The overall file size is decreasing, so shrink the file to its final size
+		// after writing. We do this after writing (instead of before) so that if
+		// the write fails, enough filesystem space will likely still be reserved
+		// to contain the previous contents.
+		if err := f.Truncate(int64(len(new))); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile_filelock.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile_filelock.go
new file mode 100644
index 000000000..454c3a42c
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile_filelock.go
@@ -0,0 +1,65 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !plan9
+
+package lockedfile
+
+import (
+	"io/fs"
+	"os"
+
+	"github.com/rogpeppe/go-internal/lockedfile/internal/filelock"
+)
+
+func openFile(name string, flag int, perm fs.FileMode) (*os.File, error) {
+	// On BSD systems, we could add the O_SHLOCK or O_EXLOCK flag to the OpenFile
+	// call instead of locking separately, but we have to support separate locking
+	// calls for Linux and Windows anyway, so it's simpler to use that approach
+	// consistently.
+
+	f, err := os.OpenFile(name, flag&^os.O_TRUNC, perm)
+	if err != nil {
+		return nil, err
+	}
+
+	switch flag & (os.O_RDONLY | os.O_WRONLY | os.O_RDWR) {
+	case os.O_WRONLY, os.O_RDWR:
+		err = filelock.Lock(f)
+	default:
+		err = filelock.RLock(f)
+	}
+	if err != nil {
+		f.Close()
+		return nil, err
+	}
+
+	if flag&os.O_TRUNC == os.O_TRUNC {
+		if err := f.Truncate(0); err != nil {
+			// The documentation for os.O_TRUNC says “if possible, truncate file when
+			// opened”, but doesn't define “possible” (golang.org/issue/28699).
+			// We'll treat regular files (and symlinks to regular files) as “possible”
+			// and ignore errors for the rest.
+			if fi, statErr := f.Stat(); statErr != nil || fi.Mode().IsRegular() {
+				filelock.Unlock(f)
+				f.Close()
+				return nil, err
+			}
+		}
+	}
+
+	return f, nil
+}
+
+func closeFile(f *os.File) error {
+	// Since locking syscalls operate on file descriptors, we must unlock the file
+	// while the descriptor is still valid — that is, before the file is closed —
+	// and avoid unlocking files that are already closed.
+	err := filelock.Unlock(f)
+
+	if closeErr := f.Close(); err == nil {
+		err = closeErr
+	}
+	return err
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile_plan9.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile_plan9.go
new file mode 100644
index 000000000..a2ce794b9
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/lockedfile_plan9.go
@@ -0,0 +1,94 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build plan9
+
+package lockedfile
+
+import (
+	"io/fs"
+	"math/rand"
+	"os"
+	"strings"
+	"time"
+)
+
+// Opening an exclusive-use file returns an error.
+// The expected error strings are:
+//
+//   - "open/create -- file is locked" (cwfs, kfs)
+//   - "exclusive lock" (fossil)
+//   - "exclusive use file already open" (ramfs)
+var lockedErrStrings = [...]string{
+	"file is locked",
+	"exclusive lock",
+	"exclusive use file already open",
+}
+
+// Even though plan9 doesn't support the Lock/RLock/Unlock functions to
+// manipulate already-open files, IsLocked is still meaningful: os.OpenFile
+// itself may return errors that indicate that a file with the ModeExclusive bit
+// set is already open.
+func isLocked(err error) bool {
+	s := err.Error()
+
+	for _, frag := range lockedErrStrings {
+		if strings.Contains(s, frag) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func openFile(name string, flag int, perm fs.FileMode) (*os.File, error) {
+	// Plan 9 uses a mode bit instead of explicit lock/unlock syscalls.
+	//
+	// Per http://man.cat-v.org/plan_9/5/stat: “Exclusive use files may be open
+	// for I/O by only one fid at a time across all clients of the server. If a
+	// second open is attempted, it draws an error.”
+	//
+	// So we can try to open a locked file, but if it fails we're on our own to
+	// figure out when it becomes available. We'll use exponential backoff with
+	// some jitter and an arbitrary limit of 500ms.
+
+	// If the file was unpacked or created by some other program, it might not
+	// have the ModeExclusive bit set. Set it before we call OpenFile, so that we
+	// can be confident that a successful OpenFile implies exclusive use.
+	if fi, err := os.Stat(name); err == nil {
+		if fi.Mode()&fs.ModeExclusive == 0 {
+			if err := os.Chmod(name, fi.Mode()|fs.ModeExclusive); err != nil {
+				return nil, err
+			}
+		}
+	} else if !os.IsNotExist(err) {
+		return nil, err
+	}
+
+	nextSleep := 1 * time.Millisecond
+	const maxSleep = 500 * time.Millisecond
+	for {
+		f, err := os.OpenFile(name, flag, perm|fs.ModeExclusive)
+		if err == nil {
+			return f, nil
+		}
+
+		if !isLocked(err) {
+			return nil, err
+		}
+
+		time.Sleep(nextSleep)
+
+		nextSleep += nextSleep
+		if nextSleep > maxSleep {
+			nextSleep = maxSleep
+		}
+		// Apply 10% jitter to avoid synchronizing collisions.
+		nextSleep += time.Duration((0.1*rand.Float64() - 0.05) * float64(nextSleep))
+	}
+}
+
+func closeFile(f *os.File) error {
+	return f.Close()
+}
diff --git a/vendor/github.com/rogpeppe/go-internal/lockedfile/mutex.go b/vendor/github.com/rogpeppe/go-internal/lockedfile/mutex.go
new file mode 100644
index 000000000..180a36c62
--- /dev/null
+++ b/vendor/github.com/rogpeppe/go-internal/lockedfile/mutex.go
@@ -0,0 +1,67 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lockedfile
+
+import (
+	"fmt"
+	"os"
+	"sync"
+)
+
+// A Mutex provides mutual exclusion within and across processes by locking a
+// well-known file. Such a file generally guards some other part of the
+// filesystem: for example, a Mutex file in a directory might guard access to
+// the entire tree rooted in that directory.
+//
+// Mutex does not implement sync.Locker: unlike a sync.Mutex, a lockedfile.Mutex
+// can fail to lock (e.g. if there is a permission error in the filesystem).
+//
+// Like a sync.Mutex, a Mutex may be included as a field of a larger struct but
+// must not be copied after first use. The Path field must be set before first
+// use and must not be change thereafter.
+type Mutex struct {
+	Path string     // The path to the well-known lock file. Must be non-empty.
+	mu   sync.Mutex // A redundant mutex. The race detector doesn't know about file locking, so in tests we may need to lock something that it understands.
+}
+
+// MutexAt returns a new Mutex with Path set to the given non-empty path.
+func MutexAt(path string) *Mutex {
+	if path == "" {
+		panic("lockedfile.MutexAt: path must be non-empty")
+	}
+	return &Mutex{Path: path}
+}
+
+func (mu *Mutex) String() string {
+	return fmt.Sprintf("lockedfile.Mutex(%s)", mu.Path)
+}
+
+// Lock attempts to lock the Mutex.
+//
+// If successful, Lock returns a non-nil unlock function: it is provided as a
+// return-value instead of a separate method to remind the caller to check the
+// accompanying error. (See https://golang.org/issue/20803.)
+func (mu *Mutex) Lock() (unlock func(), err error) {
+	if mu.Path == "" {
+		panic("lockedfile.Mutex: missing Path during Lock")
+	}
+
+	// We could use either O_RDWR or O_WRONLY here. If we choose O_RDWR and the
+	// file at mu.Path is write-only, the call to OpenFile will fail with a
+	// permission error. That's actually what we want: if we add an RLock method
+	// in the future, it should call OpenFile with O_RDONLY and will require the
+	// files must be readable, so we should not let the caller make any
+	// assumptions about Mutex working with write-only files.
+	f, err := OpenFile(mu.Path, os.O_RDWR|os.O_CREATE, 0666)
+	if err != nil {
+		return nil, err
+	}
+	mu.mu.Lock()
+
+	return func() {
+		mu.mu.Unlock()
+		f.Close()
+	}, nil
+}