9bc8d63c9f
Looks like we had our own copy of the "getDevices" code already, so use that code (which also matches the code that's used to _generate_ the spec, so a better match). Moving the code to a separate file, I also noticed that the _unix and _linux code was _exactly_ the same (baring some `//nolint:` comments), so also removing the duplicated code. With this patch applied, we removed the dependency on the libcontainer/devices package (leaving only libcontainer/user). Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
138 lines
3.2 KiB
Go
138 lines
3.2 KiB
Go
// +build !windows
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/*
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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 oci
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/pkg/errors"
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"golang.org/x/sys/unix"
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)
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var errNotADevice = errors.New("not a device node")
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// HostDevices returns all devices that can be found under /dev directory.
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func HostDevices() ([]specs.LinuxDevice, error) {
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return getDevices("/dev", "")
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}
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func getDevices(path, containerPath string) ([]specs.LinuxDevice, error) {
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stat, err := os.Stat(path)
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if err != nil {
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return nil, errors.Wrap(err, "error stating device path")
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}
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if !stat.IsDir() {
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dev, err := deviceFromPath(path)
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if err != nil {
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return nil, err
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}
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if containerPath != "" {
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dev.Path = containerPath
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}
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return []specs.LinuxDevice{*dev}, nil
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}
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files, err := ioutil.ReadDir(path)
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if err != nil {
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return nil, err
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}
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var out []specs.LinuxDevice
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for _, f := range files {
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switch {
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case f.IsDir():
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switch f.Name() {
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// ".lxc" & ".lxd-mounts" added to address https://github.com/lxc/lxd/issues/2825
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// ".udev" added to address https://github.com/opencontainers/runc/issues/2093
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case "pts", "shm", "fd", "mqueue", ".lxc", ".lxd-mounts", ".udev":
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continue
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default:
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var cp string
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if containerPath != "" {
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cp = filepath.Join(containerPath, filepath.Base(f.Name()))
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}
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sub, err := getDevices(filepath.Join(path, f.Name()), cp)
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if err != nil {
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return nil, err
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}
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out = append(out, sub...)
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continue
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}
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case f.Name() == "console":
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continue
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}
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device, err := deviceFromPath(filepath.Join(path, f.Name()))
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if err != nil {
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if err == errNotADevice {
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continue
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}
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if os.IsNotExist(err) {
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continue
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}
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return nil, err
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}
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if containerPath != "" {
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device.Path = filepath.Join(containerPath, filepath.Base(f.Name()))
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}
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out = append(out, *device)
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}
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return out, nil
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}
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func deviceFromPath(path string) (*specs.LinuxDevice, error) {
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var stat unix.Stat_t
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if err := unix.Lstat(path, &stat); err != nil {
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return nil, err
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}
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var (
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devNumber = uint64(stat.Rdev) //nolint: unconvert // the type is 32bit on mips.
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major = unix.Major(devNumber)
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minor = unix.Minor(devNumber)
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)
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if major == 0 {
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return nil, errNotADevice
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}
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var (
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devType string
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mode = stat.Mode
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)
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switch {
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case mode&unix.S_IFBLK == unix.S_IFBLK:
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devType = "b"
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case mode&unix.S_IFCHR == unix.S_IFCHR:
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devType = "c"
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}
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fm := os.FileMode(mode &^ unix.S_IFMT)
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return &specs.LinuxDevice{
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Type: devType,
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Path: path,
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Major: int64(major),
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Minor: int64(minor),
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FileMode: &fm,
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UID: &stat.Uid,
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GID: &stat.Gid,
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}, nil
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}
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