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// +build linux
package createconfig
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/docker/docker/profiles/seccomp"
"github.com/opencontainers/runc/libcontainer/configs"
"github.com/opencontainers/runc/libcontainer/devices"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/pkg/errors"
"golang.org/x/sys/unix"
)
// Device transforms a libcontainer configs.Device to a specs.LinuxDevice object.
func Device(d *configs.Device) spec.LinuxDevice {
return spec.LinuxDevice{
Type: string(d.Type),
Path: d.Path,
Major: d.Major,
Minor: d.Minor,
FileMode: fmPtr(int64(d.FileMode)),
UID: u32Ptr(int64(d.Uid)),
GID: u32Ptr(int64(d.Gid)),
}
}
// devicesFromPath computes a list of devices
func devicesFromPath(g *generate.Generator, devicePath string) error {
devs := strings.Split(devicePath, ":")
resolvedDevicePath := devs[0]
// check if it is a symbolic link
if src, err := os.Lstat(resolvedDevicePath); err == nil && src.Mode()&os.ModeSymlink == os.ModeSymlink {
if linkedPathOnHost, err := filepath.EvalSymlinks(resolvedDevicePath); err == nil {
resolvedDevicePath = linkedPathOnHost
}
}
st, err := os.Stat(resolvedDevicePath)
if err != nil {
return errors.Wrapf(err, "cannot stat %s", devicePath)
}
if st.IsDir() {
found := false
src := resolvedDevicePath
dest := src
var devmode string
if len(devs) > 1 {
if len(devs[1]) > 0 && devs[1][0] == '/' {
dest = devs[1]
} else {
devmode = devs[1]
}
}
if len(devs) > 2 {
if devmode != "" {
return errors.Wrapf(unix.EINVAL, "invalid device specification %s", devicePath)
}
devmode = devs[2]
}
// mount the internal devices recursively
if err := filepath.Walk(resolvedDevicePath, func(dpath string, f os.FileInfo, e error) error {
if f.Mode()&os.ModeDevice == os.ModeDevice {
found = true
device := fmt.Sprintf("%s:%s", dpath, filepath.Join(dest, strings.TrimPrefix(dpath, src)))
if devmode != "" {
device = fmt.Sprintf("%s:%s", device, devmode)
}
if err := addDevice(g, device); err != nil {
return errors.Wrapf(err, "failed to add %s device", dpath)
}
}
return nil
}); err != nil {
return err
}
if !found {
return errors.Wrapf(unix.EINVAL, "no devices found in %s", devicePath)
}
return nil
}
return addDevice(g, strings.Join(append([]string{resolvedDevicePath}, devs[1:]...), ":"))
}
func addDevice(g *generate.Generator, device string) error {
src, dst, permissions, err := ParseDevice(device)
if err != nil {
return err
}
dev, err := devices.DeviceFromPath(src, permissions)
if err != nil {
return errors.Wrapf(err, "%s is not a valid device", src)
}
dev.Path = dst
linuxdev := spec.LinuxDevice{
Path: dev.Path,
Type: string(dev.Type),
Major: dev.Major,
Minor: dev.Minor,
FileMode: &dev.FileMode,
UID: &dev.Uid,
GID: &dev.Gid,
}
g.AddDevice(linuxdev)
g.AddLinuxResourcesDevice(true, string(dev.Type), &dev.Major, &dev.Minor, dev.Permissions)
return nil
}
func (c *CreateConfig) addPrivilegedDevices(g *generate.Generator) error {
hostDevices, err := devices.HostDevices()
if err != nil {
return err
}
g.ClearLinuxDevices()
for _, d := range hostDevices {
g.AddDevice(Device(d))
}
// Add resources device - need to clear the existing one first.
g.Spec().Linux.Resources.Devices = nil
g.AddLinuxResourcesDevice(true, "", nil, nil, "rwm")
return nil
}
func getSeccompConfig(config *CreateConfig, configSpec *spec.Spec) (*spec.LinuxSeccomp, error) {
var seccompConfig *spec.LinuxSeccomp
var err error
if config.SeccompProfilePath != "" {
seccompProfile, err := ioutil.ReadFile(config.SeccompProfilePath)
if err != nil {
return nil, errors.Wrapf(err, "opening seccomp profile (%s) failed", config.SeccompProfilePath)
}
seccompConfig, err = seccomp.LoadProfile(string(seccompProfile), configSpec)
if err != nil {
return nil, errors.Wrapf(err, "loading seccomp profile (%s) failed", config.SeccompProfilePath)
}
} else {
seccompConfig, err = seccomp.GetDefaultProfile(configSpec)
if err != nil {
return nil, errors.Wrapf(err, "loading seccomp profile (%s) failed", config.SeccompProfilePath)
}
}
return seccompConfig, nil
}
func (c *CreateConfig) createBlockIO() (*spec.LinuxBlockIO, error) {
var ret *spec.LinuxBlockIO
bio := &spec.LinuxBlockIO{}
if c.Resources.BlkioWeight > 0 {
ret = bio
bio.Weight = &c.Resources.BlkioWeight
}
if len(c.Resources.BlkioWeightDevice) > 0 {
var lwds []spec.LinuxWeightDevice
ret = bio
for _, i := range c.Resources.BlkioWeightDevice {
wd, err := validateweightDevice(i)
if err != nil {
return ret, errors.Wrapf(err, "invalid values for blkio-weight-device")
}
wdStat, err := getStatFromPath(wd.path)
if err != nil {
return ret, errors.Wrapf(err, "error getting stat from path %q", wd.path)
}
lwd := spec.LinuxWeightDevice{
Weight: &wd.weight,
}
lwd.Major = int64(unix.Major(wdStat.Rdev))
lwd.Minor = int64(unix.Minor(wdStat.Rdev))
lwds = append(lwds, lwd)
}
bio.WeightDevice = lwds
}
if len(c.Resources.DeviceReadBps) > 0 {
ret = bio
readBps, err := makeThrottleArray(c.Resources.DeviceReadBps, bps)
if err != nil {
return ret, err
}
bio.ThrottleReadBpsDevice = readBps
}
if len(c.Resources.DeviceWriteBps) > 0 {
ret = bio
writeBpds, err := makeThrottleArray(c.Resources.DeviceWriteBps, bps)
if err != nil {
return ret, err
}
bio.ThrottleWriteBpsDevice = writeBpds
}
if len(c.Resources.DeviceReadIOps) > 0 {
ret = bio
readIOps, err := makeThrottleArray(c.Resources.DeviceReadIOps, iops)
if err != nil {
return ret, err
}
bio.ThrottleReadIOPSDevice = readIOps
}
if len(c.Resources.DeviceWriteIOps) > 0 {
ret = bio
writeIOps, err := makeThrottleArray(c.Resources.DeviceWriteIOps, iops)
if err != nil {
return ret, err
}
bio.ThrottleWriteIOPSDevice = writeIOps
}
return ret, nil
}
func makeThrottleArray(throttleInput []string, rateType int) ([]spec.LinuxThrottleDevice, error) {
var (
ltds []spec.LinuxThrottleDevice
t *throttleDevice
err error
)
for _, i := range throttleInput {
if rateType == bps {
t, err = validateBpsDevice(i)
} else {
t, err = validateIOpsDevice(i)
}
if err != nil {
return []spec.LinuxThrottleDevice{}, err
}
ltdStat, err := getStatFromPath(t.path)
if err != nil {
return ltds, errors.Wrapf(err, "error getting stat from path %q", t.path)
}
ltd := spec.LinuxThrottleDevice{
Rate: t.rate,
}
ltd.Major = int64(unix.Major(ltdStat.Rdev))
ltd.Minor = int64(unix.Minor(ltdStat.Rdev))
ltds = append(ltds, ltd)
}
return ltds, nil
}
func getStatFromPath(path string) (unix.Stat_t, error) {
s := unix.Stat_t{}
err := unix.Stat(path, &s)
return s, err
}
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