mirror of https://github.com/k3s-io/k3s
93 lines
3.4 KiB
Go
93 lines
3.4 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package libdocker
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import (
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"fmt"
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"math/rand"
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"strconv"
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"strings"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/types"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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// This file contains functions used in the non-CRI integration (< 1.6). They
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// are currently used for recoginzing containers created by pre-1.6 kubelets.
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// TODO: Remove this file for kubernetes 1.8+.
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// Creates a name which can be reversed to identify both full pod name and container name.
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// This function returns stable name, unique name and a unique id.
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// Although rand.Uint32() is not really unique, but it's enough for us because error will
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// only occur when instances of the same container in the same pod have the same UID. The
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// chance is really slim.
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func BuildDockerName(dockerName KubeletContainerName, container *v1.Container) (string, string, string) {
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containerName := dockerName.ContainerName + "." + strconv.FormatUint(kubecontainer.HashContainerLegacy(container), 16)
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stableName := fmt.Sprintf("%s_%s_%s_%s",
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containerNamePrefix,
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containerName,
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dockerName.PodFullName,
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dockerName.PodUID)
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UID := fmt.Sprintf("%08x", rand.Uint32())
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return stableName, fmt.Sprintf("%s_%s", stableName, UID), UID
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}
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// Unpacks a container name, returning the pod full name and container name we would have used to
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// construct the docker name. If we are unable to parse the name, an error is returned.
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func ParseDockerName(name string) (dockerName *KubeletContainerName, hash uint64, err error) {
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// For some reason docker appears to be appending '/' to names.
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// If it's there, strip it.
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name = strings.TrimPrefix(name, "/")
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parts := strings.Split(name, "_")
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if len(parts) == 0 || parts[0] != containerNamePrefix {
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err = fmt.Errorf("failed to parse Docker container name %q into parts", name)
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return nil, 0, err
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}
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if len(parts) < 6 {
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// We have at least 5 fields. We may have more in the future.
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// Anything with less fields than this is not something we can
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// manage.
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glog.Warningf("found a container with the %q prefix, but too few fields (%d): %q", containerNamePrefix, len(parts), name)
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err = fmt.Errorf("Docker container name %q has less parts than expected %v", name, parts)
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return nil, 0, err
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}
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nameParts := strings.Split(parts[1], ".")
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containerName := nameParts[0]
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if len(nameParts) > 1 {
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hash, err = strconv.ParseUint(nameParts[1], 16, 32)
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if err != nil {
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glog.Warningf("invalid container hash %q in container %q", nameParts[1], name)
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}
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}
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podFullName := parts[2] + "_" + parts[3]
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podUID := types.UID(parts[4])
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return &KubeletContainerName{podFullName, podUID, containerName}, hash, nil
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}
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// KubeletContainerName encapsulates a pod name and a Kubernetes container name.
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type KubeletContainerName struct {
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PodFullName string
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PodUID types.UID
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ContainerName string
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}
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