vendor: docker v20.10.3-0.20220831131523-b5a0d7a188ac (22.06 branch)
full diff: a60b458179...b5a0d7a188
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
pull/1300/head
Sebastiaan van Stijn
3 years ago
parent
c3e3abac07
commit
2bf239ba0b
@ -0,0 +1,19 @@
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package system
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import (
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"os"
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"path/filepath"
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"strings"
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)
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// IsAbs is a platform-agnostic wrapper for filepath.IsAbs.
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//
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// On Windows, golang filepath.IsAbs does not consider a path \windows\system32
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// as absolute as it doesn't start with a drive-letter/colon combination. However,
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// in docker we need to verify things such as WORKDIR /windows/system32 in
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// a Dockerfile (which gets translated to \windows\system32 when being processed
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// by the daemon). This SHOULD be treated as absolute from a docker processing
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// perspective.
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func IsAbs(path string) bool {
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return filepath.IsAbs(path) || strings.HasPrefix(path, string(os.PathSeparator))
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}
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@ -0,0 +1,35 @@
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package system
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import (
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"os"
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"github.com/moby/sys/sequential"
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)
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// CreateSequential is deprecated.
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//
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// Deprecated: use os.Create or github.com/moby/sys/sequential.Create()
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func CreateSequential(name string) (*os.File, error) {
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return sequential.Create(name)
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}
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|
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// OpenSequential is deprecated.
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//
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// Deprecated: use os.Open or github.com/moby/sys/sequential.Open
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func OpenSequential(name string) (*os.File, error) {
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return sequential.Open(name)
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}
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// OpenFileSequential is deprecated.
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//
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// Deprecated: use github.com/moby/sys/sequential.OpenFile()
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func OpenFileSequential(name string, flag int, perm os.FileMode) (*os.File, error) {
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return sequential.OpenFile(name, flag, perm)
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}
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// TempFileSequential is deprecated.
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//
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// Deprecated: use os.CreateTemp or github.com/moby/sys/sequential.CreateTemp
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func TempFileSequential(dir, prefix string) (f *os.File, err error) {
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return sequential.CreateTemp(dir, prefix)
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}
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@ -0,0 +1,202 @@
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Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
|
||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
|
||||
|
||||
1. Definitions.
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|
||||
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|
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"control" means (i) the power, direct or indirect, to cause the
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APPENDIX: How to apply the Apache License to your work.
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To apply the Apache License to your work, attach the following
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
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limitations under the License.
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@ -0,0 +1,15 @@
|
||||
// Package sequential provides a set of functions for managing sequential
|
||||
// files on Windows.
|
||||
//
|
||||
// The origin of these functions are the golang OS and windows packages,
|
||||
// slightly modified to only cope with files, not directories due to the
|
||||
// specific use case.
|
||||
//
|
||||
// The alteration is to allow a file on Windows to be opened with
|
||||
// FILE_FLAG_SEQUENTIAL_SCAN (particular for docker load), to avoid eating
|
||||
// the standby list, particularly when accessing large files such as layer.tar.
|
||||
//
|
||||
// For non-Windows platforms, the package provides wrappers for the equivalents
|
||||
// in the os packages. They are passthrough on Unix platforms, and only relevant
|
||||
// on Windows.
|
||||
package sequential
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||||
@ -0,0 +1,45 @@
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||||
//go:build !windows
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||||
// +build !windows
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||||
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||||
package sequential
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||||
import "os"
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||||
|
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// Create creates the named file with mode 0666 (before umask), truncating
|
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// it if it already exists. If successful, methods on the returned
|
||||
// File can be used for I/O; the associated file descriptor has mode
|
||||
// O_RDWR.
|
||||
// If there is an error, it will be of type *PathError.
|
||||
func Create(name string) (*os.File, error) {
|
||||
return os.Create(name)
|
||||
}
|
||||
|
||||
// Open opens the named file for reading. If successful, methods on
|
||||
// the returned file can be used for reading; the associated file
|
||||
// descriptor has mode O_RDONLY.
|
||||
// If there is an error, it will be of type *PathError.
|
||||
func Open(name string) (*os.File, error) {
|
||||
return os.Open(name)
|
||||
}
|
||||
|
||||
// OpenFile is the generalized open call; most users will use Open
|
||||
// or Create instead. It opens the named file with specified flag
|
||||
// (O_RDONLY etc.) and perm, (0666 etc.) if applicable. If successful,
|
||||
// methods on the returned File can be used for I/O.
|
||||
// If there is an error, it will be of type *PathError.
|
||||
func OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
|
||||
return os.OpenFile(name, flag, perm)
|
||||
}
|
||||
|
||||
// CreateTemp creates a new temporary file in the directory dir
|
||||
// with a name beginning with prefix, opens the file for reading
|
||||
// and writing, and returns the resulting *os.File.
|
||||
// If dir is the empty string, TempFile uses the default directory
|
||||
// for temporary files (see os.TempDir).
|
||||
// Multiple programs calling TempFile simultaneously
|
||||
// will not choose the same file. The caller can use f.Name()
|
||||
// to find the pathname of the file. It is the caller's responsibility
|
||||
// to remove the file when no longer needed.
|
||||
func CreateTemp(dir, prefix string) (f *os.File, err error) {
|
||||
return os.CreateTemp(dir, prefix)
|
||||
}
|
||||
@ -0,0 +1,161 @@
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package sequential
|
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|
||||
import (
|
||||
"os"
|
||||
"path/filepath"
|
||||
"strconv"
|
||||
"sync"
|
||||
"syscall"
|
||||
"time"
|
||||
"unsafe"
|
||||
|
||||
"golang.org/x/sys/windows"
|
||||
)
|
||||
|
||||
// Create creates the named file with mode 0666 (before umask), truncating
|
||||
// it if it already exists. If successful, methods on the returned
|
||||
// File can be used for I/O; the associated file descriptor has mode
|
||||
// O_RDWR.
|
||||
// If there is an error, it will be of type *PathError.
|
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func Create(name string) (*os.File, error) {
|
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return OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0)
|
||||
}
|
||||
|
||||
// Open opens the named file for reading. If successful, methods on
|
||||
// the returned file can be used for reading; the associated file
|
||||
// descriptor has mode O_RDONLY.
|
||||
// If there is an error, it will be of type *PathError.
|
||||
func Open(name string) (*os.File, error) {
|
||||
return OpenFile(name, os.O_RDONLY, 0)
|
||||
}
|
||||
|
||||
// OpenFile is the generalized open call; most users will use Open
|
||||
// or Create instead.
|
||||
// If there is an error, it will be of type *PathError.
|
||||
func OpenFile(name string, flag int, _ os.FileMode) (*os.File, error) {
|
||||
if name == "" {
|
||||
return nil, &os.PathError{Op: "open", Path: name, Err: syscall.ENOENT}
|
||||
}
|
||||
r, err := openFileSequential(name, flag, 0)
|
||||
if err == nil {
|
||||
return r, nil
|
||||
}
|
||||
return nil, &os.PathError{Op: "open", Path: name, Err: err}
|
||||
}
|
||||
|
||||
func openFileSequential(name string, flag int, _ os.FileMode) (file *os.File, err error) {
|
||||
r, e := openSequential(name, flag|windows.O_CLOEXEC, 0)
|
||||
if e != nil {
|
||||
return nil, e
|
||||
}
|
||||
return os.NewFile(uintptr(r), name), nil
|
||||
}
|
||||
|
||||
func makeInheritSa() *windows.SecurityAttributes {
|
||||
var sa windows.SecurityAttributes
|
||||
sa.Length = uint32(unsafe.Sizeof(sa))
|
||||
sa.InheritHandle = 1
|
||||
return &sa
|
||||
}
|
||||
|
||||
func openSequential(path string, mode int, _ uint32) (fd windows.Handle, err error) {
|
||||
if len(path) == 0 {
|
||||
return windows.InvalidHandle, windows.ERROR_FILE_NOT_FOUND
|
||||
}
|
||||
pathp, err := windows.UTF16PtrFromString(path)
|
||||
if err != nil {
|
||||
return windows.InvalidHandle, err
|
||||
}
|
||||
var access uint32
|
||||
switch mode & (windows.O_RDONLY | windows.O_WRONLY | windows.O_RDWR) {
|
||||
case windows.O_RDONLY:
|
||||
access = windows.GENERIC_READ
|
||||
case windows.O_WRONLY:
|
||||
access = windows.GENERIC_WRITE
|
||||
case windows.O_RDWR:
|
||||
access = windows.GENERIC_READ | windows.GENERIC_WRITE
|
||||
}
|
||||
if mode&windows.O_CREAT != 0 {
|
||||
access |= windows.GENERIC_WRITE
|
||||
}
|
||||
if mode&windows.O_APPEND != 0 {
|
||||
access &^= windows.GENERIC_WRITE
|
||||
access |= windows.FILE_APPEND_DATA
|
||||
}
|
||||
sharemode := uint32(windows.FILE_SHARE_READ | windows.FILE_SHARE_WRITE)
|
||||
var sa *windows.SecurityAttributes
|
||||
if mode&windows.O_CLOEXEC == 0 {
|
||||
sa = makeInheritSa()
|
||||
}
|
||||
var createmode uint32
|
||||
switch {
|
||||
case mode&(windows.O_CREAT|windows.O_EXCL) == (windows.O_CREAT | windows.O_EXCL):
|
||||
createmode = windows.CREATE_NEW
|
||||
case mode&(windows.O_CREAT|windows.O_TRUNC) == (windows.O_CREAT | windows.O_TRUNC):
|
||||
createmode = windows.CREATE_ALWAYS
|
||||
case mode&windows.O_CREAT == windows.O_CREAT:
|
||||
createmode = windows.OPEN_ALWAYS
|
||||
case mode&windows.O_TRUNC == windows.O_TRUNC:
|
||||
createmode = windows.TRUNCATE_EXISTING
|
||||
default:
|
||||
createmode = windows.OPEN_EXISTING
|
||||
}
|
||||
// Use FILE_FLAG_SEQUENTIAL_SCAN rather than FILE_ATTRIBUTE_NORMAL as implemented in golang.
|
||||
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa363858(v=vs.85).aspx
|
||||
const fileFlagSequentialScan = 0x08000000 // FILE_FLAG_SEQUENTIAL_SCAN
|
||||
h, e := windows.CreateFile(pathp, access, sharemode, sa, createmode, fileFlagSequentialScan, 0)
|
||||
return h, e
|
||||
}
|
||||
|
||||
// Helpers for CreateTemp
|
||||
var rand uint32
|
||||
var randmu sync.Mutex
|
||||
|
||||
func reseed() uint32 {
|
||||
return uint32(time.Now().UnixNano() + int64(os.Getpid()))
|
||||
}
|
||||
|
||||
func nextSuffix() string {
|
||||
randmu.Lock()
|
||||
r := rand
|
||||
if r == 0 {
|
||||
r = reseed()
|
||||
}
|
||||
r = r*1664525 + 1013904223 // constants from Numerical Recipes
|
||||
rand = r
|
||||
randmu.Unlock()
|
||||
return strconv.Itoa(int(1e9 + r%1e9))[1:]
|
||||
}
|
||||
|
||||
// CreateTemp is a copy of os.CreateTemp, modified to use sequential
|
||||
// file access. Below is the original comment from golang:
|
||||
// TempFile creates a new temporary file in the directory dir
|
||||
// with a name beginning with prefix, opens the file for reading
|
||||
// and writing, and returns the resulting *os.File.
|
||||
// If dir is the empty string, TempFile uses the default directory
|
||||
// for temporary files (see os.TempDir).
|
||||
// Multiple programs calling TempFile simultaneously
|
||||
// will not choose the same file. The caller can use f.Name()
|
||||
// to find the pathname of the file. It is the caller's responsibility
|
||||
// to remove the file when no longer needed.
|
||||
func CreateTemp(dir, prefix string) (f *os.File, err error) {
|
||||
if dir == "" {
|
||||
dir = os.TempDir()
|
||||
}
|
||||
|
||||
nconflict := 0
|
||||
for i := 0; i < 10000; i++ {
|
||||
name := filepath.Join(dir, prefix+nextSuffix())
|
||||
f, err = OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0o600)
|
||||
if os.IsExist(err) {
|
||||
if nconflict++; nconflict > 10 {
|
||||
randmu.Lock()
|
||||
rand = reseed()
|
||||
randmu.Unlock()
|
||||
}
|
||||
continue
|
||||
}
|
||||
break
|
||||
}
|
||||
return
|
||||
}
|
||||
Loading…
Reference in New Issue