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docker.go
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docker.go
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// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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 utils
import (
"fmt"
"os"
"path"
"regexp"
"strings"
dockertypes "github.com/docker/docker/api/types"
v1 "github.com/google/cadvisor/info/v1"
)
const (
DriverStatusPoolName = "Pool Name"
DriverStatusMetadataFile = "Metadata file"
DriverStatusParentDataset = "Parent Dataset"
)
// Regexp that identifies docker cgroups, containers started with
// --cgroup-parent have another prefix than 'docker'
var cgroupRegexp = regexp.MustCompile(`([a-z0-9]{64})`)
func DriverStatusValue(status [][2]string, target string) string {
for _, v := range status {
if strings.EqualFold(v[0], target) {
return v[1]
}
}
return ""
}
func DockerThinPoolName(info dockertypes.Info) (string, error) {
poolName := DriverStatusValue(info.DriverStatus, DriverStatusPoolName)
if len(poolName) == 0 {
return "", fmt.Errorf("Could not get devicemapper pool name")
}
return poolName, nil
}
func DockerMetadataDevice(info dockertypes.Info) (string, error) {
metadataDevice := DriverStatusValue(info.DriverStatus, DriverStatusMetadataFile)
if len(metadataDevice) != 0 {
return metadataDevice, nil
}
poolName, err := DockerThinPoolName(info)
if err != nil {
return "", err
}
metadataDevice = fmt.Sprintf("/dev/mapper/%s_tmeta", poolName)
if _, err := os.Stat(metadataDevice); err != nil {
return "", err
}
return metadataDevice, nil
}
func DockerZfsFilesystem(info dockertypes.Info) (string, error) {
filesystem := DriverStatusValue(info.DriverStatus, DriverStatusParentDataset)
if len(filesystem) == 0 {
return "", fmt.Errorf("Could not get zfs filesystem")
}
return filesystem, nil
}
func SummariesToImages(summaries []dockertypes.ImageSummary) ([]v1.DockerImage, error) {
var out []v1.DockerImage
const unknownTag = "<none>:<none>"
for _, summary := range summaries {
if len(summary.RepoTags) == 1 && summary.RepoTags[0] == unknownTag {
// images with repo or tags are uninteresting.
continue
}
di := v1.DockerImage{
ID: summary.ID,
RepoTags: summary.RepoTags,
Created: summary.Created,
VirtualSize: summary.VirtualSize,
Size: summary.Size,
}
out = append(out, di)
}
return out, nil
}
// Returns the ID from the full container name.
func ContainerNameToId(name string) string {
id := path.Base(name)
if matches := cgroupRegexp.FindStringSubmatch(id); matches != nil {
return matches[1]
}
return id
}
// IsContainerName returns true if the cgroup with associated name
// corresponds to a container.
func IsContainerName(name string) bool {
// always ignore .mount cgroup even if associated with docker and delegate to systemd
if strings.HasSuffix(name, ".mount") {
return false
}
return cgroupRegexp.MatchString(path.Base(name))
}