b0d3b35b28
This change splits the definition of pkg/cri/os.ResolveSymbolicLink by platform (windows/!windows), and switches to an alternate implementation for Windows. This aims to fix the issue described in containerd/containerd#5405. The previous implementation which just called filepath.EvalSymlinks has historically had issues on Windows. One of these issues we were able to fix in Go, but EvalSymlinks's behavior is not well specified on Windows, and there could easily be more issues in the future, so it seems prudent to move to a separate implementation for Windows. The new implementation uses the Windows GetFinalPathNameByHandle API, which takes a handle to an open file or directory and some flags, and returns the "real" name for the object. See comments in the code for details on the implementation. I have tested this change with a variety of mounts and everything seems to work as expected. Functions that make incorrect assumptions on what a Windows path can look like may have some trouble with the \\?\ path syntax. For instance EvalSymlinks fails when given a \\?\UNC\ path. For this reason, the resolvePath implementation modifies the returned path to translate to the more common form (\\?\UNC\server\share -> \\server\share). Signed-off-by: Kevin Parsons <kevpar@microsoft.com>
90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
/*
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Copyright The containerd Authors.
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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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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package os
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import (
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"io"
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"io/ioutil"
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"os"
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"github.com/moby/sys/symlink"
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)
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// OS collects system level operations that need to be mocked out
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// during tests.
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type OS interface {
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MkdirAll(path string, perm os.FileMode) error
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RemoveAll(path string) error
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Stat(name string) (os.FileInfo, error)
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ResolveSymbolicLink(name string) (string, error)
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FollowSymlinkInScope(path, scope string) (string, error)
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CopyFile(src, dest string, perm os.FileMode) error
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WriteFile(filename string, data []byte, perm os.FileMode) error
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Hostname() (string, error)
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}
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// RealOS is used to dispatch the real system level operations.
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type RealOS struct{}
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// MkdirAll will call os.MkdirAll to create a directory.
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func (RealOS) MkdirAll(path string, perm os.FileMode) error {
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return os.MkdirAll(path, perm)
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}
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// RemoveAll will call os.RemoveAll to remove the path and its children.
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func (RealOS) RemoveAll(path string) error {
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return os.RemoveAll(path)
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}
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// Stat will call os.Stat to get the status of the given file.
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func (RealOS) Stat(name string) (os.FileInfo, error) {
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return os.Stat(name)
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}
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// FollowSymlinkInScope will call symlink.FollowSymlinkInScope.
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func (RealOS) FollowSymlinkInScope(path, scope string) (string, error) {
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return symlink.FollowSymlinkInScope(path, scope)
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}
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// CopyFile will copy src file to dest file
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func (RealOS) CopyFile(src, dest string, perm os.FileMode) error {
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in, err := os.Open(src)
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if err != nil {
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return err
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}
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defer in.Close()
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out, err := os.OpenFile(dest, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
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if err != nil {
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return err
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}
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defer out.Close()
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_, err = io.Copy(out, in)
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return err
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}
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// WriteFile will call ioutil.WriteFile to write data into a file.
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func (RealOS) WriteFile(filename string, data []byte, perm os.FileMode) error {
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return ioutil.WriteFile(filename, data, perm)
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}
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// Hostname will call os.Hostname to get the hostname of the host.
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func (RealOS) Hostname() (string, error) {
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return os.Hostname()
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}
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