143 lines
4.2 KiB
Go
143 lines
4.2 KiB
Go
/*
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Copyright 2017 The Kubernetes 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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"path/filepath"
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"github.com/containerd/containerd/mount"
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"github.com/containerd/fifo"
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"github.com/docker/docker/pkg/symlink"
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"golang.org/x/net/context"
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"golang.org/x/sys/unix"
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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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OpenFifo(ctx context.Context, fn string, flag int, perm os.FileMode) (io.ReadWriteCloser, 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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Mount(source string, target string, fstype string, flags uintptr, data string) error
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Unmount(target string) error
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LookupMount(path string) (mount.Info, 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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// OpenFifo will call fifo.OpenFifo to open a fifo.
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func (RealOS) OpenFifo(ctx context.Context, fn string, flag int, perm os.FileMode) (io.ReadWriteCloser, error) {
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return fifo.OpenFifo(ctx, fn, flag, perm)
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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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// ResolveSymbolicLink will follow any symbolic links
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func (RealOS) ResolveSymbolicLink(path string) (string, error) {
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info, err := os.Lstat(path)
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if err != nil {
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return "", err
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}
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if info.Mode()&os.ModeSymlink != os.ModeSymlink {
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return path, nil
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}
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return filepath.EvalSymlinks(path)
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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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// Mount will call unix.Mount to mount the file.
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func (RealOS) Mount(source string, target string, fstype string, flags uintptr, data string) error {
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return unix.Mount(source, target, fstype, flags, data)
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}
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// Unmount will call Unmount to unmount the file.
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func (RealOS) Unmount(target string) error {
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return Unmount(target)
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}
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// LookupMount gets mount info of a given path.
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func (RealOS) LookupMount(path string) (mount.Info, error) {
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return mount.Lookup(path)
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}
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// Unmount unmounts the target. It does not return an error in case the target is not mounted.
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// In case the target does not exist, the appropriate error is returned.
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func Unmount(target string) error {
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err := unix.Unmount(target, unix.MNT_DETACH)
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if err == unix.EINVAL {
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// ignore "not mounted" error
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err = nil
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}
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return err
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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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