// deviceFromPath takes the path to a device and it's cgroup_permissions(which cannot be easily queried) and looks up the information about a linux device.
func deviceFromPath(path, permissions string) (*specs.Device, *specs.DeviceCgroup, error) {
fileInfo, err := os.Lstat(path)
if err != nil {
return nil, nil, err
}
var (
devType rune
mode = fileInfo.Mode()
fileModePermissionBits = os.FileMode.Perm(mode)
)
switch {
case mode&os.ModeDevice == 0:
return nil, nil, devices.ErrNotADevice
case mode&os.ModeCharDevice != 0:
fileModePermissionBits |= syscall.S_IFCHR
devType = 'c'
default:
fileModePermissionBits |= syscall.S_IFBLK
devType = 'b'
}
statt, ok := fileInfo.Sys().(*syscall.Stat_t)
if !ok {
return nil, nil, fmt.Errorf("cannot determine the device number for device %s", path)
}
devNumber := int(statt.Rdev)
major := devices.Major(devNumber)
minor := devices.Minor(devNumber)
t := string(devType)
dev := &specs.Device{
Type: t,
Path: path,
Major: major,
Minor: minor,
FileMode: &fileModePermissionBits,
UID: &statt.Uid,
GID: &statt.Gid,
}
dc := &specs.DeviceCgroup{
Allow: true,
Type: &t,
Major: &major,
Minor: &minor,
Access: &permissions,
}
return dev, dc, nil
}
// deviceFromPath takes the path to a device and it's cgroup_permissions(which cannot be easily queried) and looks up the information about a linux device.
func deviceFromPath(path, permissions string) (*specs.Device, error) {
fileInfo, err := os.Lstat(path)
if err != nil {
return nil, err
}
var (
devType rune
mode = fileInfo.Mode()
fileModePermissionBits = os.FileMode.Perm(mode)
)
switch {
case mode&os.ModeDevice == 0:
return nil, devices.ErrNotADevice
case mode&os.ModeCharDevice != 0:
fileModePermissionBits |= syscall.S_IFCHR
devType = 'c'
default:
fileModePermissionBits |= syscall.S_IFBLK
devType = 'b'
}
statt, ok := fileInfo.Sys().(*syscall.Stat_t)
if !ok {
return nil, fmt.Errorf("cannot determine the device number for device %s", path)
}
devNumber := int(statt.Rdev)
return &specs.Device{
Type: devType,
Path: path,
Major: devices.Major(devNumber),
Minor: devices.Minor(devNumber),
Permissions: permissions,
FileMode: fileModePermissionBits,
UID: statt.Uid,
GID: statt.Gid,
}, nil
}