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Check for valid paths in create-symlinks hook

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This change updates the create-symlinks hook to always evaluate
link paths in the container's root filesystem. In addition the
executable is updated to return an error if a link could not
be created.

Signed-off-by: Christopher Desiniotis <cdesiniotis@nvidia.com>
This commit is contained in:
Christopher Desiniotis 2024-10-21 16:31:45 -07:00
parent a04e3ac4f7
commit 7e0cd45b1c
No known key found for this signature in database
GPG Key ID: 603C8E544D789A89
12 changed files with 944 additions and 8 deletions
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17
cmd/nvidia-cdi-hook/create-symlinks/create-symlinks.go
View File

@ -23,6 +23,7 @@ import (
"path/filepath" "path/filepath"
"strings" "strings"
"github.com/moby/sys/symlink"
"github.com/urfave/cli/v2" "github.com/urfave/cli/v2"
"github.com/NVIDIA/nvidia-container-toolkit/internal/logger" "github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
@ -96,13 +97,12 @@ func (m command) run(c *cli.Context, cfg *config) error {
} }
parts := strings.Split(l, "::") parts := strings.Split(l, "::")
if len(parts) != 2 { if len(parts) != 2 {
m.logger.Warningf("Invalid link specification %v", l) return fmt.Errorf("invalid symlink specification %v", l)
continue
} }
err := m.createLink(containerRoot, parts[0], parts[1]) err := m.createLink(containerRoot, parts[0], parts[1])
if err != nil { if err != nil {
m.logger.Warningf("Failed to create link %v: %v", parts, err) return fmt.Errorf("failed to create link %v: %w", parts, err)
} }
created[l] = true created[l] = true
} }
@ -132,12 +132,17 @@ func (m command) createLink(containerRoot string, targetPath string, link string
return nil return nil
} }
m.logger.Infof("Symlinking %v to %v", linkPath, targetPath) resolvedLinkPath, err := symlink.FollowSymlinkInScope(linkPath, containerRoot)
err = os.MkdirAll(filepath.Dir(linkPath), 0755) if err != nil {
return fmt.Errorf("failed to follow path for link %v relative to %v: %w", link, containerRoot, err)
}
m.logger.Infof("Symlinking %v to %v", resolvedLinkPath, targetPath)
err = os.MkdirAll(filepath.Dir(resolvedLinkPath), 0755)
if err != nil { if err != nil {
return fmt.Errorf("failed to create directory: %v", err) return fmt.Errorf("failed to create directory: %v", err)
} }
err = os.Symlink(targetPath, linkPath) err = os.Symlink(targetPath, resolvedLinkPath)
if err != nil { if err != nil {
return fmt.Errorf("failed to create symlink: %v", err) return fmt.Errorf("failed to create symlink: %v", err)
} }

119
cmd/nvidia-cdi-hook/create-symlinks/create-symlinks_test.go
View File

@ -3,10 +3,10 @@ package symlinks
import ( import (
"os" "os"
"path/filepath" "path/filepath"
"strings"
"testing" "testing"
testlog "github.com/sirupsen/logrus/hooks/test" testlog "github.com/sirupsen/logrus/hooks/test"
"github.com/stretchr/testify/require" "github.com/stretchr/testify/require"
"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup/symlinks" "github.com/NVIDIA/nvidia-container-toolkit/internal/lookup/symlinks"
@ -14,7 +14,6 @@ import (
func TestDoesLinkExist(t *testing.T) { func TestDoesLinkExist(t *testing.T) {
tmpDir := t.TempDir() tmpDir := t.TempDir()
require.NoError( require.NoError(
t, t,
makeFs(tmpDir, makeFs(tmpDir,
@ -42,6 +41,120 @@ func TestDoesLinkExist(t *testing.T) {
require.False(t, exists) require.False(t, exists)
} }
func TestCreateLink(t *testing.T) {
type link struct {
path string
target string
}
type expectedLink struct {
link
err error
}
testCases := []struct {
description string
containerContents []dirOrLink
link link
expectedCreateError error
expectedLinks []expectedLink
}{
{
description: "link to / resolves to container root",
containerContents: []dirOrLink{
{path: "/lib/foo", target: "/"},
},
link: link{
path: "/lib/foo/libfoo.so",
target: "libfoo.so.1",
},
expectedLinks: []expectedLink{
{
link: link{
path: "{{ .containerRoot }}/libfoo.so",
target: "libfoo.so.1",
},
},
},
},
{
description: "link to / resolves to container root; parent relative link",
containerContents: []dirOrLink{
{path: "/lib/foo", target: "/"},
},
link: link{
path: "/lib/foo/libfoo.so",
target: "../libfoo.so.1",
},
expectedLinks: []expectedLink{
{
link: link{
path: "{{ .containerRoot }}/libfoo.so",
target: "../libfoo.so.1",
},
},
},
},
{
description: "link to / resolves to container root; absolute link",
containerContents: []dirOrLink{
{path: "/lib/foo", target: "/"},
},
link: link{
path: "/lib/foo/libfoo.so",
target: "/a-path-in-container/foo/libfoo.so.1",
},
expectedLinks: []expectedLink{
{
link: link{
path: "{{ .containerRoot }}/libfoo.so",
target: "/a-path-in-container/foo/libfoo.so.1",
},
},
{
// We also check that the target is NOT created.
link: link{
path: "{{ .containerRoot }}/a-path-in-container/foo/libfoo.so.1",
},
err: os.ErrNotExist,
},
},
},
}
for _, tc := range testCases {
t.Run(tc.description, func(t *testing.T) {
tmpDir := t.TempDir()
hostRoot := filepath.Join(tmpDir, "/host-root/")
containerRoot := filepath.Join(tmpDir, "/container-root")
require.NoError(t, makeFs(hostRoot))
require.NoError(t, makeFs(containerRoot, tc.containerContents...))
// nvidia-cdi-hook create-symlinks --link linkSpec
err := getTestCommand().createLink(containerRoot, tc.link.target, tc.link.path)
// TODO: We may be able to replace this with require.ErrorIs.
if tc.expectedCreateError != nil {
require.Error(t, err)
} else {
require.NoError(t, err)
}
for _, expectedLink := range tc.expectedLinks {
path := strings.Replace(expectedLink.path, "{{ .containerRoot }}", containerRoot, -1)
path = strings.Replace(path, "{{ .hostRoot }}", hostRoot, -1)
if expectedLink.target != "" {
target, err := symlinks.Resolve(path)
require.ErrorIs(t, err, expectedLink.err)
require.Equal(t, expectedLink.target, target)
} else {
_, err := os.Stat(path)
require.ErrorIs(t, err, expectedLink.err)
}
}
})
}
}
func TestCreateLinkRelativePath(t *testing.T) { func TestCreateLinkRelativePath(t *testing.T) {
tmpDir := t.TempDir() tmpDir := t.TempDir()
hostRoot := filepath.Join(tmpDir, "/host-root/") hostRoot := filepath.Join(tmpDir, "/host-root/")
@ -131,6 +244,8 @@ func TestCreateLinkOutOfBounds(t *testing.T) {
// require.Error(t, err) // require.Error(t, err)
_, err = os.Lstat(filepath.Join(hostRoot, "libfoo.so")) _, err = os.Lstat(filepath.Join(hostRoot, "libfoo.so"))
require.ErrorIs(t, err, os.ErrNotExist) require.ErrorIs(t, err, os.ErrNotExist)
_, err = os.Lstat(filepath.Join(containerRoot, hostRoot, "libfoo.so"))
require.NoError(t, err)
} }
type dirOrLink struct { type dirOrLink struct {

1
go.mod
View File

@ -6,6 +6,7 @@ require (
github.com/NVIDIA/go-nvlib v0.6.1 github.com/NVIDIA/go-nvlib v0.6.1
github.com/NVIDIA/go-nvml v0.12.4-0 github.com/NVIDIA/go-nvml v0.12.4-0
github.com/fsnotify/fsnotify v1.7.0 github.com/fsnotify/fsnotify v1.7.0
github.com/moby/sys/symlink v0.3.0
github.com/opencontainers/runtime-spec v1.2.0 github.com/opencontainers/runtime-spec v1.2.0
github.com/pelletier/go-toml v1.9.5 github.com/pelletier/go-toml v1.9.5
github.com/sirupsen/logrus v1.9.3 github.com/sirupsen/logrus v1.9.3

2
go.sum
View File

@ -28,6 +28,8 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY= github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE= github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/mndrix/tap-go v0.0.0-20171203230836-629fa407e90b/go.mod h1:pzzDgJWZ34fGzaAZGFW22KVZDfyrYW+QABMrWnJBnSs= github.com/mndrix/tap-go v0.0.0-20171203230836-629fa407e90b/go.mod h1:pzzDgJWZ34fGzaAZGFW22KVZDfyrYW+QABMrWnJBnSs=
github.com/moby/sys/symlink v0.3.0 h1:GZX89mEZ9u53f97npBy4Rc3vJKj7JBDj/PN2I22GrNU=
github.com/moby/sys/symlink v0.3.0/go.mod h1:3eNdhduHmYPcgsJtZXW1W4XUJdZGBIkttZ8xKqPUJq0=
github.com/mrunalp/fileutils v0.5.0/go.mod h1:M1WthSahJixYnrXQl/DFQuteStB1weuxD2QJNHXfbSQ= github.com/mrunalp/fileutils v0.5.0/go.mod h1:M1WthSahJixYnrXQl/DFQuteStB1weuxD2QJNHXfbSQ=
github.com/opencontainers/runtime-spec v1.0.3-0.20220825212826-86290f6a00fb/go.mod h1:jwyrGlmzljRJv/Fgzds9SsS/C5hL+LL3ko9hs6T5lQ0= github.com/opencontainers/runtime-spec v1.0.3-0.20220825212826-86290f6a00fb/go.mod h1:jwyrGlmzljRJv/Fgzds9SsS/C5hL+LL3ko9hs6T5lQ0=
github.com/opencontainers/runtime-spec v1.2.0 h1:z97+pHb3uELt/yiAWD691HNHQIF07bE7dzrbT927iTk= github.com/opencontainers/runtime-spec v1.2.0 h1:z97+pHb3uELt/yiAWD691HNHQIF07bE7dzrbT927iTk=

202
vendor/github.com/moby/sys/symlink/LICENSE generated vendored Normal file
View File

@ -0,0 +1,202 @@
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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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
Copyright 2014-2018 Docker, Inc.
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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Copyright (c) 2014-2018 The Docker & 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.

11
vendor/github.com/moby/sys/symlink/doc.go generated vendored Normal file
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// Package symlink implements [FollowSymlinkInScope] which is an extension
// of [path/filepath.EvalSymlinks], as well as a Windows long-path aware
// version of [path/filepath.EvalSymlinks] from the Go standard library.
//
// The code from [path/filepath.EvalSymlinks] has been adapted in fs.go.
// Read the [LICENSE.BSD] file that governs fs.go and [LICENSE.APACHE] for
// fs_unix_test.go.
//
// [LICENSE.APACHE]: https://github.com/moby/sys/blob/symlink/v0.2.0/symlink/LICENSE.APACHE
// [LICENSE.BSD]: https://github.com/moby/sys/blob/symlink/v0.2.0/symlink/LICENSE.APACHE
package symlink

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// Copyright 2012 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.BSD file.
// This code is a modified version of path/filepath/symlink.go from the Go
// standard library in [docker@fa3ec89], which was based on [go1.3.3],
// with Windows implementatinos being added in [docker@9b648df].
//
// [docker@fa3ec89]: https://github.com/moby/moby/commit/fa3ec89515431ce425f924c8a9a804d5cb18382f
// [go1.3.3]: https://github.com/golang/go/blob/go1.3.3/src/pkg/path/filepath/symlink.go
// [docker@9b648df]: https://github.com/moby/moby/commit/9b648dfac6453de5944ee4bb749115d85a253a05
package symlink
import (
"bytes"
"errors"
"os"
"path/filepath"
"strings"
)
// FollowSymlinkInScope evaluates symbolic links in "path" within a scope "root"
// and returns a result guaranteed to be contained within the scope "root" at
// the time of the call. It returns an error of either "path" or "root" cannot
// be converted to an absolute path.
//
// Symbolic links in "root" are not evaluated and left as-is. Errors encountered
// while attempting to evaluate symlinks in path are returned, but non-existing
// paths are valid and do not constitute an error. "path" must contain "root"
// as a prefix, or else an error is returned. Trying to break out from "root"
// does not constitute an error, instead resolves the path within "root".
//
// Example:
//
// // If "/foo/bar" is a symbolic link to "/outside":
// FollowSymlinkInScope("/foo/bar", "/foo") // Returns "/foo/outside" instead of "/outside"
//
// IMPORTANT: It is the caller's responsibility to call FollowSymlinkInScope
// after relevant symbolic links are created to avoid Time-of-check Time-of-use
// (TOCTOU) race conditions ([CWE-367]). No additional symbolic links must be
// created after evaluating, as those could potentially make a previously-safe
// path unsafe.
//
// For example, if "/foo/bar" does not exist, FollowSymlinkInScope("/foo/bar", "/foo")
// evaluates the path to "/foo/bar". If one makes "/foo/bar" a symbolic link to
// "/baz" subsequently, then "/foo/bar" should no longer be considered safely
// contained in "/foo".
//
// [CWE-367]: https://cwe.mitre.org/data/definitions/367.html
func FollowSymlinkInScope(path, root string) (string, error) {
path, err := filepath.Abs(filepath.FromSlash(path))
if err != nil {
return "", err
}
root, err = filepath.Abs(filepath.FromSlash(root))
if err != nil {
return "", err
}
return evalSymlinksInScope(path, root)
}
// evalSymlinksInScope evaluates symbolic links in "path" within a scope "root"
// and returns a result guaranteed to be contained within the scope "root" at
// the time of the call. Refer to [FollowSymlinkInScope] for details.
func evalSymlinksInScope(path, root string) (string, error) {
root = filepath.Clean(root)
if path == root {
return path, nil
}
if !strings.HasPrefix(path, root) {
return "", errors.New("evalSymlinksInScope: " + path + " is not in " + root)
}
const maxIter = 255
originalPath := path
// given root of "/a" and path of "/a/b/../../c" we want path to be "/b/../../c"
path = path[len(root):]
if root == string(filepath.Separator) {
path = string(filepath.Separator) + path
}
if !strings.HasPrefix(path, string(filepath.Separator)) {
return "", errors.New("evalSymlinksInScope: " + path + " is not in " + root)
}
path = filepath.Clean(path)
// consume path by taking each frontmost path element,
// expanding it if it's a symlink, and appending it to b
var b bytes.Buffer
// b here will always be considered to be the "current absolute path inside
// root" when we append paths to it, we also append a slash and use
// filepath.Clean after the loop to trim the trailing slash
for n := 0; path != ""; n++ {
if n > maxIter {
return "", errors.New("evalSymlinksInScope: too many links in " + originalPath)
}
// find next path component, p
i := strings.IndexRune(path, filepath.Separator)
var p string
if i == -1 {
p, path = path, ""
} else {
p, path = path[:i], path[i+1:]
}
if p == "" {
continue
}
// this takes a b.String() like "b/../" and a p like "c" and turns it
// into "/b/../c" which then gets filepath.Cleaned into "/c" and then
// root gets prepended and we Clean again (to remove any trailing slash
// if the first Clean gave us just "/")
cleanP := filepath.Clean(string(filepath.Separator) + b.String() + p)
if isDriveOrRoot(cleanP) {
// never Lstat "/" itself, or drive letters on Windows
b.Reset()
continue
}
fullP := filepath.Clean(root + cleanP)
fi, err := os.Lstat(fullP)
if os.IsNotExist(err) {
// if p does not exist, accept it
b.WriteString(p)
b.WriteRune(filepath.Separator)
continue
}
if err != nil {
return "", err
}
if fi.Mode()&os.ModeSymlink == 0 {
b.WriteString(p)
b.WriteRune(filepath.Separator)
continue
}
// it's a symlink, put it at the front of path
dest, err := os.Readlink(fullP)
if err != nil {
return "", err
}
if isAbs(dest) {
b.Reset()
}
path = dest + string(filepath.Separator) + path
}
// see note above on "fullP := ..." for why this is double-cleaned and
// what's happening here
return filepath.Clean(root + filepath.Clean(string(filepath.Separator)+b.String())), nil
}
// EvalSymlinks is a modified version of [path/filepath.EvalSymlinks] from
// the Go standard library with support for Windows long paths (paths prepended
// with "\\?\"). On non-Windows platforms, it's an alias for [path/filepath.EvalSymlinks].
//
// EvalSymlinks returns the path name after the evaluation of any symbolic
// links. If path is relative, the result will be relative to the current
// directory, unless one of the components is an absolute symbolic link.
//
// EvalSymlinks calls [path/filepath.Clean] on the result.
func EvalSymlinks(path string) (string, error) {
return evalSymlinks(path)
}

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vendor/github.com/moby/sys/symlink/fs_unix.go generated vendored Normal file
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//go:build !windows
// +build !windows
package symlink
import (
"path/filepath"
)
func evalSymlinks(path string) (string, error) {
return filepath.EvalSymlinks(path)
}
func isDriveOrRoot(p string) bool {
return p == string(filepath.Separator)
}
var isAbs = filepath.IsAbs

197
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// Copyright 2012 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.BSD file.
// This code is a modified version of [path/filepath/symlink_windows.go]
// and [path/filepath/symlink.go] from the Go 1.4.2 standard library, and
// added in [docker@9b648df].
//
// [path/filepath/symlink_windows.go]: https://github.com/golang/go/blob/go1.4.2/src/path/filepath/symlink_windows.go
// [path/filepath/symlink.go]: https://github.com/golang/go/blob/go1.4.2/src/path/filepath/symlink.go
// [docker@9b648df]: https://github.com/moby/moby/commit/9b648dfac6453de5944ee4bb749115d85a253a05
package symlink
import (
"bytes"
"errors"
"os"
"path/filepath"
"strings"
"golang.org/x/sys/windows"
)
func toShort(path string) (string, error) {
p, err := windows.UTF16FromString(path)
if err != nil {
return "", err
}
b := p // GetShortPathName says we can reuse buffer
n, err := windows.GetShortPathName(&p[0], &b[0], uint32(len(b)))
if err != nil {
return "", err
}
if n > uint32(len(b)) {
b = make([]uint16, n)
if _, err = windows.GetShortPathName(&p[0], &b[0], uint32(len(b))); err != nil {
return "", err
}
}
return windows.UTF16ToString(b), nil
}
func toLong(path string) (string, error) {
p, err := windows.UTF16FromString(path)
if err != nil {
return "", err
}
b := p // GetLongPathName says we can reuse buffer
n, err := windows.GetLongPathName(&p[0], &b[0], uint32(len(b)))
if err != nil {
return "", err
}
if n > uint32(len(b)) {
b = make([]uint16, n)
n, err = windows.GetLongPathName(&p[0], &b[0], uint32(len(b)))
if err != nil {
return "", err
}
}
b = b[:n]
return windows.UTF16ToString(b), nil
}
func evalSymlinks(path string) (string, error) {
path, err := walkSymlinks(path)
if err != nil {
return "", err
}
p, err := toShort(path)
if err != nil {
return "", err
}
p, err = toLong(p)
if err != nil {
return "", err
}
// windows.GetLongPathName does not change the case of the drive letter,
// but the result of EvalSymlinks must be unique, so we have
// EvalSymlinks(`c:\a`) == EvalSymlinks(`C:\a`).
// Make drive letter upper case.
if len(p) >= 2 && p[1] == ':' && 'a' <= p[0] && p[0] <= 'z' {
p = string(p[0]+'A'-'a') + p[1:]
} else if len(p) >= 6 && p[5] == ':' && 'a' <= p[4] && p[4] <= 'z' {
p = p[:3] + string(p[4]+'A'-'a') + p[5:]
}
return filepath.Clean(p), nil
}
const (
utf8RuneSelf = 0x80
longPathPrefix = `\\?\`
)
func walkSymlinks(path string) (string, error) {
const maxIter = 255
originalPath := path
// consume path by taking each frontmost path element,
// expanding it if it's a symlink, and appending it to b
var b bytes.Buffer
for n := 0; path != ""; n++ {
if n > maxIter {
return "", errors.New("too many links in " + originalPath)
}
// A path beginning with `\\?\` represents the root, so automatically
// skip that part and begin processing the next segment.
if strings.HasPrefix(path, longPathPrefix) {
b.WriteString(longPathPrefix)
path = path[4:]
continue
}
// find next path component, p
i := -1
for j, c := range path {
if c < utf8RuneSelf && os.IsPathSeparator(uint8(c)) {
i = j
break
}
}
var p string
if i == -1 {
p, path = path, ""
} else {
p, path = path[:i], path[i+1:]
}
if p == "" {
if b.Len() == 0 {
// must be absolute path
b.WriteRune(filepath.Separator)
}
continue
}
// If this is the first segment after the long path prefix, accept the
// current segment as a volume root or UNC share and move on to the next.
if b.String() == longPathPrefix {
b.WriteString(p)
b.WriteRune(filepath.Separator)
continue
}
fi, err := os.Lstat(b.String() + p)
if err != nil {
return "", err
}
if fi.Mode()&os.ModeSymlink == 0 {
b.WriteString(p)
if path != "" || (b.Len() == 2 && len(p) == 2 && p[1] == ':') {
b.WriteRune(filepath.Separator)
}
continue
}
// it's a symlink, put it at the front of path
dest, err := os.Readlink(b.String() + p)
if err != nil {
return "", err
}
if isAbs(dest) {
b.Reset()
}
path = dest + string(filepath.Separator) + path
}
return filepath.Clean(b.String()), nil
}
func isDriveOrRoot(p string) bool {
if p == string(filepath.Separator) {
return true
}
length := len(p)
if length >= 2 {
if p[length-1] == ':' && (('a' <= p[length-2] && p[length-2] <= 'z') || ('A' <= p[length-2] && p[length-2] <= 'Z')) {
return true
}
}
return false
}
// isAbs is a platform-specific wrapper for filepath.IsAbs. On Windows,
// golang filepath.IsAbs does not consider a path \windows\system32 as absolute
// as it doesn't start with a drive-letter/colon combination. However, in
// docker we need to verify things such as WORKDIR /windows/system32 in
// a Dockerfile (which gets translated to \windows\system32 when being processed
// by the daemon. This SHOULD be treated as absolute from a docker processing
// perspective.
func isAbs(path string) bool {
if filepath.IsAbs(path) || strings.HasPrefix(path, string(os.PathSeparator)) {
return true
}
return false
}

3
vendor/modules.txt vendored
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@ -27,6 +27,9 @@ github.com/google/uuid
## explicit ## explicit
# github.com/kr/pretty v0.3.1 # github.com/kr/pretty v0.3.1
## explicit; go 1.12 ## explicit; go 1.12
# github.com/moby/sys/symlink v0.3.0
## explicit; go 1.17
github.com/moby/sys/symlink
# github.com/opencontainers/runtime-spec v1.2.0 # github.com/opencontainers/runtime-spec v1.2.0
## explicit ## explicit
github.com/opencontainers/runtime-spec/specs-go github.com/opencontainers/runtime-spec/specs-go