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oci.go
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oci.go
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// Copyright (c) 2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"syscall"
vc "github.com/containers/virtcontainers"
"github.com/containers/virtcontainers/pkg/oci"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
// Contants related to cgroup memory directory
const (
cgroupsTasksFile = "tasks"
cgroupsProcsFile = "cgroup.procs"
cgroupsDirMode = os.FileMode(0750)
cgroupsFileMode = os.FileMode(0640)
cgroupsMountType = "cgroup"
// Filesystem type corresponding to CGROUP_SUPER_MAGIC as listed
// here: http://man7.org/linux/man-pages/man2/statfs.2.html
cgroupFsType = 0x27e0eb
)
var (
errNeedLinuxResource = errors.New("Linux resource cannot be empty")
)
var cgroupsMemDirPath = "/sys/fs/cgroup"
// getContainerByPrefix returns the full containerID for a container
// whose ID matches the specified prefix.
//
// An error is returned if >1 containers are found with the specified
// prefix.
func getContainerIDByPrefix(containerID string) (string, error) {
if containerID == "" {
return "", fmt.Errorf("Missing container ID")
}
podStatusList, err := vc.ListPod()
if err != nil {
return "", err
}
var matches []string
for _, podStatus := range podStatusList {
if podStatus.ID == containerID {
return containerID, nil
}
if strings.HasPrefix(podStatus.ID, containerID) {
matches = append(matches, podStatus.ID)
}
}
l := len(matches)
if l == 1 {
return matches[0], nil
} else if l > 1 {
return "", fmt.Errorf("Partial container ID not unique")
}
return "", nil
}
func validCreateParams(containerID, bundlePath string) error {
// container ID MUST be provided.
if containerID == "" {
return fmt.Errorf("Missing container ID")
}
// container ID MUST be unique.
fullID, err := getContainerIDByPrefix(containerID)
if err != nil {
return err
}
if fullID != "" {
return fmt.Errorf("ID already in use, unique ID should be provided")
}
// bundle path MUST be provided.
if bundlePath == "" {
return fmt.Errorf("Missing bundle path")
}
// bundle path MUST be valid.
fileInfo, err := os.Stat(bundlePath)
if err != nil {
return fmt.Errorf("Invalid bundle path '%s': %s", bundlePath, err)
}
if fileInfo.IsDir() == false {
return fmt.Errorf("Invalid bundle path '%s', it should be a directory", bundlePath)
}
return nil
}
func expandContainerID(containerID string) (fullID string, err error) {
// container ID MUST be provided.
if containerID == "" {
return "", fmt.Errorf("Missing container ID")
}
// container ID MUST exist.
fullID, err = getContainerIDByPrefix(containerID)
if err != nil {
return "", err
}
if fullID == "" {
return "", fmt.Errorf("Container ID does not exist")
}
return fullID, nil
}
func processRunning(pid int) (bool, error) {
process, err := os.FindProcess(pid)
if err != nil {
return false, err
}
if err := process.Signal(syscall.Signal(0)); err != nil {
return false, nil
}
return true, nil
}
func stopContainer(podStatus vc.PodStatus) error {
if len(podStatus.ContainersStatus) != 1 {
return fmt.Errorf("ContainerStatus list from PodStatus is wrong, expecting only one ContainerStatus")
}
// Calling StopContainer allows to make sure the container is properly
// stopped and removed from the pod. That way, the container's state is
// updated to the expected "stopped" state.
if _, err := vc.StopContainer(podStatus.ID, podStatus.ContainersStatus[0].ID); err != nil {
return err
}
return nil
}
// processCgroupsPath process the cgroups path as expected from the
// OCI runtime specification. It returns a list of complete paths
// that should be created and used for every specified resource.
func processCgroupsPath(ociSpec oci.CompatOCISpec) ([]string, error) {
var cgroupsPathList []string
if ociSpec.Linux.CgroupsPath == "" {
return []string{}, nil
}
if ociSpec.Linux.Resources == nil {
return []string{}, nil
}
if ociSpec.Linux.Resources.Memory != nil {
memCgroupsPath, err := processCgroupsPathForResource(ociSpec, "memory")
if err != nil {
return []string{}, err
}
if memCgroupsPath != "" {
cgroupsPathList = append(cgroupsPathList, memCgroupsPath)
}
}
if ociSpec.Linux.Resources.CPU != nil {
cpuCgroupsPath, err := processCgroupsPathForResource(ociSpec, "cpu")
if err != nil {
return []string{}, err
}
if cpuCgroupsPath != "" {
cgroupsPathList = append(cgroupsPathList, cpuCgroupsPath)
}
}
if ociSpec.Linux.Resources.Pids != nil {
pidsCgroupsPath, err := processCgroupsPathForResource(ociSpec, "pids")
if err != nil {
return []string{}, err
}
if pidsCgroupsPath != "" {
cgroupsPathList = append(cgroupsPathList, pidsCgroupsPath)
}
}
if ociSpec.Linux.Resources.BlockIO != nil {
blkIOCgroupsPath, err := processCgroupsPathForResource(ociSpec, "blkio")
if err != nil {
return []string{}, err
}
if blkIOCgroupsPath != "" {
cgroupsPathList = append(cgroupsPathList, blkIOCgroupsPath)
}
}
return cgroupsPathList, nil
}
func processCgroupsPathForResource(ociSpec oci.CompatOCISpec, resource string) (string, error) {
if resource == "" {
return "", errNeedLinuxResource
}
// Relative cgroups path provided.
if filepath.IsAbs(ociSpec.Linux.CgroupsPath) == false {
return filepath.Join(cgroupsMemDirPath, resource, ociSpec.Linux.CgroupsPath), nil
}
// Absolute cgroups path provided.
var cgroupMount specs.Mount
cgroupMountFound := false
for _, mount := range ociSpec.Mounts {
if mount.Type == "cgroup" {
cgroupMount = mount
cgroupMountFound = true
break
}
}
if cgroupMountFound == false {
return "", fmt.Errorf("cgroupsPath is absolute, cgroup mount MUST exist")
}
if cgroupMount.Destination == "" {
return "", fmt.Errorf("cgroupsPath is absolute, cgroup mount destination cannot be empty")
}
cgroupPath := filepath.Join(cgroupMount.Destination, resource)
// It is not an error to have this cgroup not mounted. It is usually
// due to an old kernel version with missing support for specific
// cgroups.
if !isCgroupMounted(cgroupPath) {
ccLog.Infof("cgroup path %s not mounted", cgroupPath)
return "", nil
}
ccLog.Infof("cgroup path %s mounted", cgroupPath)
return filepath.Join(cgroupPath, ociSpec.Linux.CgroupsPath), nil
}
func isCgroupMounted(cgroupPath string) bool {
var statFs syscall.Statfs_t
if err := syscall.Statfs(cgroupPath, &statFs); err != nil {
return false
}
if statFs.Type != int64(cgroupFsType) {
return false
}
return true
}