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76 lines
2.7 KiB
Go
76 lines
2.7 KiB
Go
/*
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Copyright 2016 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 kuberuntime
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import (
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"fmt"
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"path"
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"strings"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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// This file implements the functions that are needed for backward
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// compatibility. Therefore, it imports various kubernetes packages
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// directly.
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const (
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// legacyContainerLogsDir is the legacy location of container logs. It is the same with
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// kubelet.containerLogsDir.
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legacyContainerLogsDir = "/var/log/containers"
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// legacyLogSuffix is the legacy log suffix.
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legacyLogSuffix = "log"
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ext4MaxFileNameLen = 255
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)
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// legacyLogSymlink composes the legacy container log path. It is only used for legacy cluster
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// logging support.
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func legacyLogSymlink(containerID string, containerName, podName, podNamespace string) string {
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return logSymlink(legacyContainerLogsDir, kubecontainer.BuildPodFullName(podName, podNamespace),
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containerName, containerID)
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}
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// getContainerIDFromLegacyLogSymlink returns error if container Id cannot be parsed
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func getContainerIDFromLegacyLogSymlink(logSymlink string) (string, error) {
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parts := strings.Split(logSymlink, "-")
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if len(parts) == 0 {
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return "", fmt.Errorf("unable to find separator in %q", logSymlink)
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}
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containerIDWithSuffix := parts[len(parts)-1]
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suffix := fmt.Sprintf(".%s", legacyLogSuffix)
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if !strings.HasSuffix(containerIDWithSuffix, suffix) {
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return "", fmt.Errorf("%q doesn't end with %q", logSymlink, suffix)
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}
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containerIDWithoutSuffix := strings.TrimSuffix(containerIDWithSuffix, suffix)
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// container can be retrieved with container Id as short as 6 characters
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if len(containerIDWithoutSuffix) < 6 {
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return "", fmt.Errorf("container Id %q is too short", containerIDWithoutSuffix)
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}
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return containerIDWithoutSuffix, nil
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}
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func logSymlink(containerLogsDir, podFullName, containerName, containerID string) string {
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suffix := fmt.Sprintf(".%s", legacyLogSuffix)
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logPath := fmt.Sprintf("%s_%s-%s", podFullName, containerName, containerID)
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// Length of a filename cannot exceed 255 characters in ext4 on Linux.
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if len(logPath) > ext4MaxFileNameLen-len(suffix) {
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logPath = logPath[:ext4MaxFileNameLen-len(suffix)]
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}
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return path.Join(containerLogsDir, logPath+suffix)
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}
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