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202
vendor/github.com/moby/sys/sequential/LICENSE generated vendored Normal file
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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.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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vendor/github.com/moby/sys/sequential/doc.go generated vendored Normal file
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// 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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vendor/github.com/moby/sys/sequential/sequential_unix.go generated vendored Normal file
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//go:build !windows
// +build !windows
package sequential
import "os"
// 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.
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)
}

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package sequential
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.
func Create(name string) (*os.File, error) {
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
}

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vendor/github.com/moby/sys/signal/LICENSE generated vendored Normal file
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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.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.
You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

61
vendor/github.com/moby/sys/signal/signal.go generated vendored Normal file
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// Package signal provides helper functions for dealing with signals across
// various operating systems.
package signal
import (
"fmt"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
)
// CatchAll catches all signals and relays them to the specified channel.
// SIGURG is not handled, as it's used by the Go runtime to support
// preemptable system calls.
func CatchAll(sigc chan os.Signal) {
var handledSigs []os.Signal
for n, s := range SignalMap {
if n == "URG" {
// Do not handle SIGURG, as in go1.14+, the go runtime issues
// SIGURG as an interrupt to support preemptable system calls on Linux.
continue
}
handledSigs = append(handledSigs, s)
}
signal.Notify(sigc, handledSigs...)
}
// StopCatch stops catching the signals and closes the specified channel.
func StopCatch(sigc chan os.Signal) {
signal.Stop(sigc)
close(sigc)
}
// ParseSignal translates a string to a valid syscall signal.
// It returns an error if the signal map doesn't include the given signal.
func ParseSignal(rawSignal string) (syscall.Signal, error) {
s, err := strconv.Atoi(rawSignal)
if err == nil {
if s == 0 {
return -1, fmt.Errorf("invalid signal: %s", rawSignal)
}
return syscall.Signal(s), nil
}
signal, ok := SignalMap[strings.TrimPrefix(strings.ToUpper(rawSignal), "SIG")]
if !ok {
return -1, fmt.Errorf("invalid signal: %s", rawSignal)
}
return signal, nil
}
// ValidSignalForPlatform returns true if a signal is valid on the platform
func ValidSignalForPlatform(sig syscall.Signal) bool {
for _, v := range SignalMap {
if v == sig {
return true
}
}
return false
}

41
vendor/github.com/moby/sys/signal/signal_darwin.go generated vendored Normal file
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package signal
import (
"syscall"
)
// SignalMap is a map of Darwin signals.
var SignalMap = map[string]syscall.Signal{
"ABRT": syscall.SIGABRT,
"ALRM": syscall.SIGALRM,
"BUS": syscall.SIGBUS,
"CHLD": syscall.SIGCHLD,
"CONT": syscall.SIGCONT,
"EMT": syscall.SIGEMT,
"FPE": syscall.SIGFPE,
"HUP": syscall.SIGHUP,
"ILL": syscall.SIGILL,
"INFO": syscall.SIGINFO,
"INT": syscall.SIGINT,
"IO": syscall.SIGIO,
"IOT": syscall.SIGIOT,
"KILL": syscall.SIGKILL,
"PIPE": syscall.SIGPIPE,
"PROF": syscall.SIGPROF,
"QUIT": syscall.SIGQUIT,
"SEGV": syscall.SIGSEGV,
"STOP": syscall.SIGSTOP,
"SYS": syscall.SIGSYS,
"TERM": syscall.SIGTERM,
"TRAP": syscall.SIGTRAP,
"TSTP": syscall.SIGTSTP,
"TTIN": syscall.SIGTTIN,
"TTOU": syscall.SIGTTOU,
"URG": syscall.SIGURG,
"USR1": syscall.SIGUSR1,
"USR2": syscall.SIGUSR2,
"VTALRM": syscall.SIGVTALRM,
"WINCH": syscall.SIGWINCH,
"XCPU": syscall.SIGXCPU,
"XFSZ": syscall.SIGXFSZ,
}

43
vendor/github.com/moby/sys/signal/signal_freebsd.go generated vendored Normal file
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package signal
import (
"syscall"
)
// SignalMap is a map of FreeBSD signals.
var SignalMap = map[string]syscall.Signal{
"ABRT": syscall.SIGABRT,
"ALRM": syscall.SIGALRM,
"BUS": syscall.SIGBUS,
"CHLD": syscall.SIGCHLD,
"CONT": syscall.SIGCONT,
"EMT": syscall.SIGEMT,
"FPE": syscall.SIGFPE,
"HUP": syscall.SIGHUP,
"ILL": syscall.SIGILL,
"INFO": syscall.SIGINFO,
"INT": syscall.SIGINT,
"IO": syscall.SIGIO,
"IOT": syscall.SIGIOT,
"KILL": syscall.SIGKILL,
"LWP": syscall.SIGLWP,
"PIPE": syscall.SIGPIPE,
"PROF": syscall.SIGPROF,
"QUIT": syscall.SIGQUIT,
"SEGV": syscall.SIGSEGV,
"STOP": syscall.SIGSTOP,
"SYS": syscall.SIGSYS,
"TERM": syscall.SIGTERM,
"THR": syscall.SIGTHR,
"TRAP": syscall.SIGTRAP,
"TSTP": syscall.SIGTSTP,
"TTIN": syscall.SIGTTIN,
"TTOU": syscall.SIGTTOU,
"URG": syscall.SIGURG,
"USR1": syscall.SIGUSR1,
"USR2": syscall.SIGUSR2,
"VTALRM": syscall.SIGVTALRM,
"WINCH": syscall.SIGWINCH,
"XCPU": syscall.SIGXCPU,
"XFSZ": syscall.SIGXFSZ,
}

84
vendor/github.com/moby/sys/signal/signal_linux.go generated vendored Normal file
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//go:build !mips && !mipsle && !mips64 && !mips64le
// +build !mips,!mipsle,!mips64,!mips64le
package signal
import (
"syscall"
"golang.org/x/sys/unix"
)
const (
sigrtmin = 34
sigrtmax = 64
)
// SignalMap is a map of Linux signals.
var SignalMap = map[string]syscall.Signal{
"ABRT": unix.SIGABRT,
"ALRM": unix.SIGALRM,
"BUS": unix.SIGBUS,
"CHLD": unix.SIGCHLD,
"CLD": unix.SIGCLD,
"CONT": unix.SIGCONT,
"FPE": unix.SIGFPE,
"HUP": unix.SIGHUP,
"ILL": unix.SIGILL,
"INT": unix.SIGINT,
"IO": unix.SIGIO,
"IOT": unix.SIGIOT,
"KILL": unix.SIGKILL,
"PIPE": unix.SIGPIPE,
"POLL": unix.SIGPOLL,
"PROF": unix.SIGPROF,
"PWR": unix.SIGPWR,
"QUIT": unix.SIGQUIT,
"SEGV": unix.SIGSEGV,
"STKFLT": unix.SIGSTKFLT,
"STOP": unix.SIGSTOP,
"SYS": unix.SIGSYS,
"TERM": unix.SIGTERM,
"TRAP": unix.SIGTRAP,
"TSTP": unix.SIGTSTP,
"TTIN": unix.SIGTTIN,
"TTOU": unix.SIGTTOU,
"URG": unix.SIGURG,
"USR1": unix.SIGUSR1,
"USR2": unix.SIGUSR2,
"VTALRM": unix.SIGVTALRM,
"WINCH": unix.SIGWINCH,
"XCPU": unix.SIGXCPU,
"XFSZ": unix.SIGXFSZ,
"RTMIN": sigrtmin,
"RTMIN+1": sigrtmin + 1,
"RTMIN+2": sigrtmin + 2,
"RTMIN+3": sigrtmin + 3,
"RTMIN+4": sigrtmin + 4,
"RTMIN+5": sigrtmin + 5,
"RTMIN+6": sigrtmin + 6,
"RTMIN+7": sigrtmin + 7,
"RTMIN+8": sigrtmin + 8,
"RTMIN+9": sigrtmin + 9,
"RTMIN+10": sigrtmin + 10,
"RTMIN+11": sigrtmin + 11,
"RTMIN+12": sigrtmin + 12,
"RTMIN+13": sigrtmin + 13,
"RTMIN+14": sigrtmin + 14,
"RTMIN+15": sigrtmin + 15,
"RTMAX-14": sigrtmax - 14,
"RTMAX-13": sigrtmax - 13,
"RTMAX-12": sigrtmax - 12,
"RTMAX-11": sigrtmax - 11,
"RTMAX-10": sigrtmax - 10,
"RTMAX-9": sigrtmax - 9,
"RTMAX-8": sigrtmax - 8,
"RTMAX-7": sigrtmax - 7,
"RTMAX-6": sigrtmax - 6,
"RTMAX-5": sigrtmax - 5,
"RTMAX-4": sigrtmax - 4,
"RTMAX-3": sigrtmax - 3,
"RTMAX-2": sigrtmax - 2,
"RTMAX-1": sigrtmax - 1,
"RTMAX": sigrtmax,
}

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vendor/github.com/moby/sys/signal/signal_linux_mipsx.go generated vendored Normal file
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//go:build linux && (mips || mipsle || mips64 || mips64le)
// +build linux
// +build mips mipsle mips64 mips64le
package signal
import (
"syscall"
"golang.org/x/sys/unix"
)
const (
sigrtmin = 34
sigrtmax = 127
)
// SignalMap is a map of Linux signals.
var SignalMap = map[string]syscall.Signal{
"ABRT": unix.SIGABRT,
"ALRM": unix.SIGALRM,
"BUS": unix.SIGBUS,
"CHLD": unix.SIGCHLD,
"CLD": unix.SIGCLD,
"CONT": unix.SIGCONT,
"FPE": unix.SIGFPE,
"HUP": unix.SIGHUP,
"ILL": unix.SIGILL,
"INT": unix.SIGINT,
"IO": unix.SIGIO,
"IOT": unix.SIGIOT,
"KILL": unix.SIGKILL,
"PIPE": unix.SIGPIPE,
"POLL": unix.SIGPOLL,
"PROF": unix.SIGPROF,
"PWR": unix.SIGPWR,
"QUIT": unix.SIGQUIT,
"SEGV": unix.SIGSEGV,
"EMT": unix.SIGEMT,
"STOP": unix.SIGSTOP,
"SYS": unix.SIGSYS,
"TERM": unix.SIGTERM,
"TRAP": unix.SIGTRAP,
"TSTP": unix.SIGTSTP,
"TTIN": unix.SIGTTIN,
"TTOU": unix.SIGTTOU,
"URG": unix.SIGURG,
"USR1": unix.SIGUSR1,
"USR2": unix.SIGUSR2,
"VTALRM": unix.SIGVTALRM,
"WINCH": unix.SIGWINCH,
"XCPU": unix.SIGXCPU,
"XFSZ": unix.SIGXFSZ,
"RTMIN": sigrtmin,
"RTMIN+1": sigrtmin + 1,
"RTMIN+2": sigrtmin + 2,
"RTMIN+3": sigrtmin + 3,
"RTMIN+4": sigrtmin + 4,
"RTMIN+5": sigrtmin + 5,
"RTMIN+6": sigrtmin + 6,
"RTMIN+7": sigrtmin + 7,
"RTMIN+8": sigrtmin + 8,
"RTMIN+9": sigrtmin + 9,
"RTMIN+10": sigrtmin + 10,
"RTMIN+11": sigrtmin + 11,
"RTMIN+12": sigrtmin + 12,
"RTMIN+13": sigrtmin + 13,
"RTMIN+14": sigrtmin + 14,
"RTMIN+15": sigrtmin + 15,
"RTMAX-14": sigrtmax - 14,
"RTMAX-13": sigrtmax - 13,
"RTMAX-12": sigrtmax - 12,
"RTMAX-11": sigrtmax - 11,
"RTMAX-10": sigrtmax - 10,
"RTMAX-9": sigrtmax - 9,
"RTMAX-8": sigrtmax - 8,
"RTMAX-7": sigrtmax - 7,
"RTMAX-6": sigrtmax - 6,
"RTMAX-5": sigrtmax - 5,
"RTMAX-4": sigrtmax - 4,
"RTMAX-3": sigrtmax - 3,
"RTMAX-2": sigrtmax - 2,
"RTMAX-1": sigrtmax - 1,
"RTMAX": sigrtmax,
}

20
vendor/github.com/moby/sys/signal/signal_unix.go generated vendored Normal file
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//go:build !windows
// +build !windows
package signal
import (
"syscall"
)
// Signals used in cli/command (no windows equivalent, use
// invalid signals so they don't get handled)
const (
// SIGCHLD is a signal sent to a process when a child process terminates, is interrupted, or resumes after being interrupted.
SIGCHLD = syscall.SIGCHLD
// SIGWINCH is a signal sent to a process when its controlling terminal changes its size
SIGWINCH = syscall.SIGWINCH
// SIGPIPE is a signal sent to a process when a pipe is written to before the other end is open for reading
SIGPIPE = syscall.SIGPIPE
)

11
vendor/github.com/moby/sys/signal/signal_unsupported.go generated vendored Normal file
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//go:build !linux && !darwin && !freebsd && !windows
// +build !linux,!darwin,!freebsd,!windows
package signal
import (
"syscall"
)
// SignalMap is an empty map of signals for unsupported platform.
var SignalMap = map[string]syscall.Signal{}

57
vendor/github.com/moby/sys/signal/signal_windows.go generated vendored Normal file
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package signal
import (
"syscall"
"golang.org/x/sys/windows"
)
// Signals used in cli/command (no windows equivalent, use
// invalid signals so they don't get handled)
const (
SIGCHLD = syscall.Signal(0xff)
SIGWINCH = syscall.Signal(0xff)
SIGPIPE = syscall.Signal(0xff)
)
// SignalMap is a map of "supported" signals. As per the comment in GOLang's
// ztypes_windows.go: "More invented values for signals". Windows doesn't
// really support signals in any way, shape or form that Unix does.
var SignalMap = map[string]syscall.Signal{
"ABRT": syscall.Signal(windows.SIGABRT),
"ALRM": syscall.Signal(windows.SIGALRM),
"BUS": syscall.Signal(windows.SIGBUS),
"FPE": syscall.Signal(windows.SIGFPE),
"HUP": syscall.Signal(windows.SIGHUP),
"ILL": syscall.Signal(windows.SIGILL),
"INT": syscall.Signal(windows.SIGINT),
"KILL": syscall.Signal(windows.SIGKILL),
"PIPE": syscall.Signal(windows.SIGPIPE),
"QUIT": syscall.Signal(windows.SIGQUIT),
"SEGV": syscall.Signal(windows.SIGSEGV),
"TERM": syscall.Signal(windows.SIGTERM),
"TRAP": syscall.Signal(windows.SIGTRAP),
// additional linux signals supported for LCOW
"CHLD": syscall.Signal(0x11),
"CLD": syscall.Signal(0x11),
"CONT": syscall.Signal(0x12),
"IO": syscall.Signal(0x1d),
"IOT": syscall.Signal(0x6),
"POLL": syscall.Signal(0x1d),
"PROF": syscall.Signal(0x1b),
"PWR": syscall.Signal(0x1e),
"STKFLT": syscall.Signal(0x10),
"STOP": syscall.Signal(0x13),
"SYS": syscall.Signal(0x1f),
"TSTP": syscall.Signal(0x14),
"TTIN": syscall.Signal(0x15),
"TTOU": syscall.Signal(0x16),
"URG": syscall.Signal(0x17),
"USR1": syscall.Signal(0xa),
"USR2": syscall.Signal(0xc),
"VTALRM": syscall.Signal(0x1a),
"WINCH": syscall.Signal(0x1c),
"XCPU": syscall.Signal(0x18),
"XFSZ": syscall.Signal(0x19),
}

202
vendor/github.com/moby/sys/user/LICENSE generated vendored Normal file
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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"License" shall mean the terms and conditions for use, reproduction,
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157
vendor/github.com/moby/sys/user/lookup_unix.go generated vendored Normal file
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//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package user
import (
"io"
"os"
"strconv"
"golang.org/x/sys/unix"
)
// Unix-specific path to the passwd and group formatted files.
const (
unixPasswdPath = "/etc/passwd"
unixGroupPath = "/etc/group"
)
// LookupUser looks up a user by their username in /etc/passwd. If the user
// cannot be found (or there is no /etc/passwd file on the filesystem), then
// LookupUser returns an error.
func LookupUser(username string) (User, error) {
return lookupUserFunc(func(u User) bool {
return u.Name == username
})
}
// LookupUid looks up a user by their user id in /etc/passwd. If the user cannot
// be found (or there is no /etc/passwd file on the filesystem), then LookupId
// returns an error.
func LookupUid(uid int) (User, error) {
return lookupUserFunc(func(u User) bool {
return u.Uid == uid
})
}
func lookupUserFunc(filter func(u User) bool) (User, error) {
// Get operating system-specific passwd reader-closer.
passwd, err := GetPasswd()
if err != nil {
return User{}, err
}
defer passwd.Close()
// Get the users.
users, err := ParsePasswdFilter(passwd, filter)
if err != nil {
return User{}, err
}
// No user entries found.
if len(users) == 0 {
return User{}, ErrNoPasswdEntries
}
// Assume the first entry is the "correct" one.
return users[0], nil
}
// LookupGroup looks up a group by its name in /etc/group. If the group cannot
// be found (or there is no /etc/group file on the filesystem), then LookupGroup
// returns an error.
func LookupGroup(groupname string) (Group, error) {
return lookupGroupFunc(func(g Group) bool {
return g.Name == groupname
})
}
// LookupGid looks up a group by its group id in /etc/group. If the group cannot
// be found (or there is no /etc/group file on the filesystem), then LookupGid
// returns an error.
func LookupGid(gid int) (Group, error) {
return lookupGroupFunc(func(g Group) bool {
return g.Gid == gid
})
}
func lookupGroupFunc(filter func(g Group) bool) (Group, error) {
// Get operating system-specific group reader-closer.
group, err := GetGroup()
if err != nil {
return Group{}, err
}
defer group.Close()
// Get the users.
groups, err := ParseGroupFilter(group, filter)
if err != nil {
return Group{}, err
}
// No user entries found.
if len(groups) == 0 {
return Group{}, ErrNoGroupEntries
}
// Assume the first entry is the "correct" one.
return groups[0], nil
}
func GetPasswdPath() (string, error) {
return unixPasswdPath, nil
}
func GetPasswd() (io.ReadCloser, error) {
return os.Open(unixPasswdPath)
}
func GetGroupPath() (string, error) {
return unixGroupPath, nil
}
func GetGroup() (io.ReadCloser, error) {
return os.Open(unixGroupPath)
}
// CurrentUser looks up the current user by their user id in /etc/passwd. If the
// user cannot be found (or there is no /etc/passwd file on the filesystem),
// then CurrentUser returns an error.
func CurrentUser() (User, error) {
return LookupUid(unix.Getuid())
}
// CurrentGroup looks up the current user's group by their primary group id's
// entry in /etc/passwd. If the group cannot be found (or there is no
// /etc/group file on the filesystem), then CurrentGroup returns an error.
func CurrentGroup() (Group, error) {
return LookupGid(unix.Getgid())
}
func currentUserSubIDs(fileName string) ([]SubID, error) {
u, err := CurrentUser()
if err != nil {
return nil, err
}
filter := func(entry SubID) bool {
return entry.Name == u.Name || entry.Name == strconv.Itoa(u.Uid)
}
return ParseSubIDFileFilter(fileName, filter)
}
func CurrentUserSubUIDs() ([]SubID, error) {
return currentUserSubIDs("/etc/subuid")
}
func CurrentUserSubGIDs() ([]SubID, error) {
return currentUserSubIDs("/etc/subgid")
}
func CurrentProcessUIDMap() ([]IDMap, error) {
return ParseIDMapFile("/proc/self/uid_map")
}
func CurrentProcessGIDMap() ([]IDMap, error) {
return ParseIDMapFile("/proc/self/gid_map")
}

605
vendor/github.com/moby/sys/user/user.go generated vendored Normal file
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package user
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
)
const (
minID = 0
maxID = 1<<31 - 1 // for 32-bit systems compatibility
)
var (
// ErrNoPasswdEntries is returned if no matching entries were found in /etc/group.
ErrNoPasswdEntries = errors.New("no matching entries in passwd file")
// ErrNoGroupEntries is returned if no matching entries were found in /etc/passwd.
ErrNoGroupEntries = errors.New("no matching entries in group file")
// ErrRange is returned if a UID or GID is outside of the valid range.
ErrRange = fmt.Errorf("uids and gids must be in range %d-%d", minID, maxID)
)
type User struct {
Name string
Pass string
Uid int
Gid int
Gecos string
Home string
Shell string
}
type Group struct {
Name string
Pass string
Gid int
List []string
}
// SubID represents an entry in /etc/sub{u,g}id
type SubID struct {
Name string
SubID int64
Count int64
}
// IDMap represents an entry in /proc/PID/{u,g}id_map
type IDMap struct {
ID int64
ParentID int64
Count int64
}
func parseLine(line []byte, v ...interface{}) {
parseParts(bytes.Split(line, []byte(":")), v...)
}
func parseParts(parts [][]byte, v ...interface{}) {
if len(parts) == 0 {
return
}
for i, p := range parts {
// Ignore cases where we don't have enough fields to populate the arguments.
// Some configuration files like to misbehave.
if len(v) <= i {
break
}
// Use the type of the argument to figure out how to parse it, scanf() style.
// This is legit.
switch e := v[i].(type) {
case *string:
*e = string(p)
case *int:
// "numbers", with conversion errors ignored because of some misbehaving configuration files.
*e, _ = strconv.Atoi(string(p))
case *int64:
*e, _ = strconv.ParseInt(string(p), 10, 64)
case *[]string:
// Comma-separated lists.
if len(p) != 0 {
*e = strings.Split(string(p), ",")
} else {
*e = []string{}
}
default:
// Someone goof'd when writing code using this function. Scream so they can hear us.
panic(fmt.Sprintf("parseLine only accepts {*string, *int, *int64, *[]string} as arguments! %#v is not a pointer!", e))
}
}
}
func ParsePasswdFile(path string) ([]User, error) {
passwd, err := os.Open(path)
if err != nil {
return nil, err
}
defer passwd.Close()
return ParsePasswd(passwd)
}
func ParsePasswd(passwd io.Reader) ([]User, error) {
return ParsePasswdFilter(passwd, nil)
}
func ParsePasswdFileFilter(path string, filter func(User) bool) ([]User, error) {
passwd, err := os.Open(path)
if err != nil {
return nil, err
}
defer passwd.Close()
return ParsePasswdFilter(passwd, filter)
}
func ParsePasswdFilter(r io.Reader, filter func(User) bool) ([]User, error) {
if r == nil {
return nil, errors.New("nil source for passwd-formatted data")
}
var (
s = bufio.NewScanner(r)
out = []User{}
)
for s.Scan() {
line := bytes.TrimSpace(s.Bytes())
if len(line) == 0 {
continue
}
// see: man 5 passwd
// name:password:UID:GID:GECOS:directory:shell
// Name:Pass:Uid:Gid:Gecos:Home:Shell
// root:x:0:0:root:/root:/bin/bash
// adm:x:3:4:adm:/var/adm:/bin/false
p := User{}
parseLine(line, &p.Name, &p.Pass, &p.Uid, &p.Gid, &p.Gecos, &p.Home, &p.Shell)
if filter == nil || filter(p) {
out = append(out, p)
}
}
if err := s.Err(); err != nil {
return nil, err
}
return out, nil
}
func ParseGroupFile(path string) ([]Group, error) {
group, err := os.Open(path)
if err != nil {
return nil, err
}
defer group.Close()
return ParseGroup(group)
}
func ParseGroup(group io.Reader) ([]Group, error) {
return ParseGroupFilter(group, nil)
}
func ParseGroupFileFilter(path string, filter func(Group) bool) ([]Group, error) {
group, err := os.Open(path)
if err != nil {
return nil, err
}
defer group.Close()
return ParseGroupFilter(group, filter)
}
func ParseGroupFilter(r io.Reader, filter func(Group) bool) ([]Group, error) {
if r == nil {
return nil, errors.New("nil source for group-formatted data")
}
rd := bufio.NewReader(r)
out := []Group{}
// Read the file line-by-line.
for {
var (
isPrefix bool
wholeLine []byte
err error
)
// Read the next line. We do so in chunks (as much as reader's
// buffer is able to keep), check if we read enough columns
// already on each step and store final result in wholeLine.
for {
var line []byte
line, isPrefix, err = rd.ReadLine()
if err != nil {
// We should return no error if EOF is reached
// without a match.
if err == io.EOF {
err = nil
}
return out, err
}
// Simple common case: line is short enough to fit in a
// single reader's buffer.
if !isPrefix && len(wholeLine) == 0 {
wholeLine = line
break
}
wholeLine = append(wholeLine, line...)
// Check if we read the whole line already.
if !isPrefix {
break
}
}
// There's no spec for /etc/passwd or /etc/group, but we try to follow
// the same rules as the glibc parser, which allows comments and blank
// space at the beginning of a line.
wholeLine = bytes.TrimSpace(wholeLine)
if len(wholeLine) == 0 || wholeLine[0] == '#' {
continue
}
// see: man 5 group
// group_name:password:GID:user_list
// Name:Pass:Gid:List
// root:x:0:root
// adm:x:4:root,adm,daemon
p := Group{}
parseLine(wholeLine, &p.Name, &p.Pass, &p.Gid, &p.List)
if filter == nil || filter(p) {
out = append(out, p)
}
}
}
type ExecUser struct {
Uid int
Gid int
Sgids []int
Home string
}
// GetExecUserPath is a wrapper for GetExecUser. It reads data from each of the
// given file paths and uses that data as the arguments to GetExecUser. If the
// files cannot be opened for any reason, the error is ignored and a nil
// io.Reader is passed instead.
func GetExecUserPath(userSpec string, defaults *ExecUser, passwdPath, groupPath string) (*ExecUser, error) {
var passwd, group io.Reader
if passwdFile, err := os.Open(passwdPath); err == nil {
passwd = passwdFile
defer passwdFile.Close()
}
if groupFile, err := os.Open(groupPath); err == nil {
group = groupFile
defer groupFile.Close()
}
return GetExecUser(userSpec, defaults, passwd, group)
}
// GetExecUser parses a user specification string (using the passwd and group
// readers as sources for /etc/passwd and /etc/group data, respectively). In
// the case of blank fields or missing data from the sources, the values in
// defaults is used.
//
// GetExecUser will return an error if a user or group literal could not be
// found in any entry in passwd and group respectively.
//
// Examples of valid user specifications are:
// - ""
// - "user"
// - "uid"
// - "user:group"
// - "uid:gid
// - "user:gid"
// - "uid:group"
//
// It should be noted that if you specify a numeric user or group id, they will
// not be evaluated as usernames (only the metadata will be filled). So attempting
// to parse a user with user.Name = "1337" will produce the user with a UID of
// 1337.
func GetExecUser(userSpec string, defaults *ExecUser, passwd, group io.Reader) (*ExecUser, error) {
if defaults == nil {
defaults = new(ExecUser)
}
// Copy over defaults.
user := &ExecUser{
Uid: defaults.Uid,
Gid: defaults.Gid,
Sgids: defaults.Sgids,
Home: defaults.Home,
}
// Sgids slice *cannot* be nil.
if user.Sgids == nil {
user.Sgids = []int{}
}
// Allow for userArg to have either "user" syntax, or optionally "user:group" syntax
var userArg, groupArg string
parseLine([]byte(userSpec), &userArg, &groupArg)
// Convert userArg and groupArg to be numeric, so we don't have to execute
// Atoi *twice* for each iteration over lines.
uidArg, uidErr := strconv.Atoi(userArg)
gidArg, gidErr := strconv.Atoi(groupArg)
// Find the matching user.
users, err := ParsePasswdFilter(passwd, func(u User) bool {
if userArg == "" {
// Default to current state of the user.
return u.Uid == user.Uid
}
if uidErr == nil {
// If the userArg is numeric, always treat it as a UID.
return uidArg == u.Uid
}
return u.Name == userArg
})
// If we can't find the user, we have to bail.
if err != nil && passwd != nil {
if userArg == "" {
userArg = strconv.Itoa(user.Uid)
}
return nil, fmt.Errorf("unable to find user %s: %w", userArg, err)
}
var matchedUserName string
if len(users) > 0 {
// First match wins, even if there's more than one matching entry.
matchedUserName = users[0].Name
user.Uid = users[0].Uid
user.Gid = users[0].Gid
user.Home = users[0].Home
} else if userArg != "" {
// If we can't find a user with the given username, the only other valid
// option is if it's a numeric username with no associated entry in passwd.
if uidErr != nil {
// Not numeric.
return nil, fmt.Errorf("unable to find user %s: %w", userArg, ErrNoPasswdEntries)
}
user.Uid = uidArg
// Must be inside valid uid range.
if user.Uid < minID || user.Uid > maxID {
return nil, ErrRange
}
// Okay, so it's numeric. We can just roll with this.
}
// On to the groups. If we matched a username, we need to do this because of
// the supplementary group IDs.
if groupArg != "" || matchedUserName != "" {
groups, err := ParseGroupFilter(group, func(g Group) bool {
// If the group argument isn't explicit, we'll just search for it.
if groupArg == "" {
// Check if user is a member of this group.
for _, u := range g.List {
if u == matchedUserName {
return true
}
}
return false
}
if gidErr == nil {
// If the groupArg is numeric, always treat it as a GID.
return gidArg == g.Gid
}
return g.Name == groupArg
})
if err != nil && group != nil {
return nil, fmt.Errorf("unable to find groups for spec %v: %w", matchedUserName, err)
}
// Only start modifying user.Gid if it is in explicit form.
if groupArg != "" {
if len(groups) > 0 {
// First match wins, even if there's more than one matching entry.
user.Gid = groups[0].Gid
} else {
// If we can't find a group with the given name, the only other valid
// option is if it's a numeric group name with no associated entry in group.
if gidErr != nil {
// Not numeric.
return nil, fmt.Errorf("unable to find group %s: %w", groupArg, ErrNoGroupEntries)
}
user.Gid = gidArg
// Must be inside valid gid range.
if user.Gid < minID || user.Gid > maxID {
return nil, ErrRange
}
// Okay, so it's numeric. We can just roll with this.
}
} else if len(groups) > 0 {
// Supplementary group ids only make sense if in the implicit form.
user.Sgids = make([]int, len(groups))
for i, group := range groups {
user.Sgids[i] = group.Gid
}
}
}
return user, nil
}
// GetAdditionalGroups looks up a list of groups by name or group id
// against the given /etc/group formatted data. If a group name cannot
// be found, an error will be returned. If a group id cannot be found,
// or the given group data is nil, the id will be returned as-is
// provided it is in the legal range.
func GetAdditionalGroups(additionalGroups []string, group io.Reader) ([]int, error) {
groups := []Group{}
if group != nil {
var err error
groups, err = ParseGroupFilter(group, func(g Group) bool {
for _, ag := range additionalGroups {
if g.Name == ag || strconv.Itoa(g.Gid) == ag {
return true
}
}
return false
})
if err != nil {
return nil, fmt.Errorf("Unable to find additional groups %v: %w", additionalGroups, err)
}
}
gidMap := make(map[int]struct{})
for _, ag := range additionalGroups {
var found bool
for _, g := range groups {
// if we found a matched group either by name or gid, take the
// first matched as correct
if g.Name == ag || strconv.Itoa(g.Gid) == ag {
if _, ok := gidMap[g.Gid]; !ok {
gidMap[g.Gid] = struct{}{}
found = true
break
}
}
}
// we asked for a group but didn't find it. let's check to see
// if we wanted a numeric group
if !found {
gid, err := strconv.ParseInt(ag, 10, 64)
if err != nil {
// Not a numeric ID either.
return nil, fmt.Errorf("Unable to find group %s: %w", ag, ErrNoGroupEntries)
}
// Ensure gid is inside gid range.
if gid < minID || gid > maxID {
return nil, ErrRange
}
gidMap[int(gid)] = struct{}{}
}
}
gids := []int{}
for gid := range gidMap {
gids = append(gids, gid)
}
return gids, nil
}
// GetAdditionalGroupsPath is a wrapper around GetAdditionalGroups
// that opens the groupPath given and gives it as an argument to
// GetAdditionalGroups.
func GetAdditionalGroupsPath(additionalGroups []string, groupPath string) ([]int, error) {
var group io.Reader
if groupFile, err := os.Open(groupPath); err == nil {
group = groupFile
defer groupFile.Close()
}
return GetAdditionalGroups(additionalGroups, group)
}
func ParseSubIDFile(path string) ([]SubID, error) {
subid, err := os.Open(path)
if err != nil {
return nil, err
}
defer subid.Close()
return ParseSubID(subid)
}
func ParseSubID(subid io.Reader) ([]SubID, error) {
return ParseSubIDFilter(subid, nil)
}
func ParseSubIDFileFilter(path string, filter func(SubID) bool) ([]SubID, error) {
subid, err := os.Open(path)
if err != nil {
return nil, err
}
defer subid.Close()
return ParseSubIDFilter(subid, filter)
}
func ParseSubIDFilter(r io.Reader, filter func(SubID) bool) ([]SubID, error) {
if r == nil {
return nil, errors.New("nil source for subid-formatted data")
}
var (
s = bufio.NewScanner(r)
out = []SubID{}
)
for s.Scan() {
line := bytes.TrimSpace(s.Bytes())
if len(line) == 0 {
continue
}
// see: man 5 subuid
p := SubID{}
parseLine(line, &p.Name, &p.SubID, &p.Count)
if filter == nil || filter(p) {
out = append(out, p)
}
}
if err := s.Err(); err != nil {
return nil, err
}
return out, nil
}
func ParseIDMapFile(path string) ([]IDMap, error) {
r, err := os.Open(path)
if err != nil {
return nil, err
}
defer r.Close()
return ParseIDMap(r)
}
func ParseIDMap(r io.Reader) ([]IDMap, error) {
return ParseIDMapFilter(r, nil)
}
func ParseIDMapFileFilter(path string, filter func(IDMap) bool) ([]IDMap, error) {
r, err := os.Open(path)
if err != nil {
return nil, err
}
defer r.Close()
return ParseIDMapFilter(r, filter)
}
func ParseIDMapFilter(r io.Reader, filter func(IDMap) bool) ([]IDMap, error) {
if r == nil {
return nil, errors.New("nil source for idmap-formatted data")
}
var (
s = bufio.NewScanner(r)
out = []IDMap{}
)
for s.Scan() {
line := bytes.TrimSpace(s.Bytes())
if len(line) == 0 {
continue
}
// see: man 7 user_namespaces
p := IDMap{}
parseParts(bytes.Fields(line), &p.ID, &p.ParentID, &p.Count)
if filter == nil || filter(p) {
out = append(out, p)
}
}
if err := s.Err(); err != nil {
return nil, err
}
return out, nil
}

43
vendor/github.com/moby/sys/user/user_fuzzer.go generated vendored Normal file
View File

@ -0,0 +1,43 @@
//go:build gofuzz
// +build gofuzz
package user
import (
"io"
"strings"
)
func IsDivisbleBy(n int, divisibleby int) bool {
return (n % divisibleby) == 0
}
func FuzzUser(data []byte) int {
if len(data) == 0 {
return -1
}
if !IsDivisbleBy(len(data), 5) {
return -1
}
var divided [][]byte
chunkSize := len(data) / 5
for i := 0; i < len(data); i += chunkSize {
end := i + chunkSize
divided = append(divided, data[i:end])
}
_, _ = ParsePasswdFilter(strings.NewReader(string(divided[0])), nil)
var passwd, group io.Reader
group = strings.NewReader(string(divided[1]))
_, _ = GetAdditionalGroups([]string{string(divided[2])}, group)
passwd = strings.NewReader(string(divided[3]))
_, _ = GetExecUser(string(divided[4]), nil, passwd, group)
return 1
}