111 lines
2.5 KiB
Go
111 lines
2.5 KiB
Go
package devices
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import (
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"errors"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/opencontainers/runc/libcontainer/configs"
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"golang.org/x/sys/unix"
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)
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var (
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// ErrNotADevice denotes that a file is not a valid linux device.
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ErrNotADevice = errors.New("not a device node")
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)
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// Testing dependencies
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var (
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unixLstat = unix.Lstat
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ioutilReadDir = ioutil.ReadDir
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)
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// Given the path to a device and its cgroup_permissions(which cannot be easily queried) look up the
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// information about a linux device and return that information as a Device struct.
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func DeviceFromPath(path, permissions string) (*configs.Device, error) {
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var stat unix.Stat_t
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err := unixLstat(path, &stat)
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if 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)
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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 rune
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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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return &configs.Device{
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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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Permissions: permissions,
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FileMode: os.FileMode(mode),
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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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// HostDevices returns all devices that can be found under /dev directory.
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func HostDevices() ([]*configs.Device, error) {
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return GetDevices("/dev")
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}
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// GetDevices recursively traverses a directory specified by path
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// and returns all devices found there.
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func GetDevices(path string) ([]*configs.Device, error) {
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files, err := ioutilReadDir(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 []*configs.Device
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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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sub, err := GetDevices(filepath.Join(path, f.Name()))
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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()), "rwm")
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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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out = append(out, device)
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}
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return out, nil
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}
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