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59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 procfs
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strconv"
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"strings"
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)
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type ProcFS struct{}
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func NewProcFS() ProcFSInterface {
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return &ProcFS{}
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}
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func containerNameFromProcCgroup(content string) (string, error) {
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lines := strings.Split(content, "\n")
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for _, line := range lines {
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entries := strings.SplitN(line, ":", 3)
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if len(entries) == 3 && entries[1] == "devices" {
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return strings.TrimSpace(entries[2]), nil
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}
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}
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return "", fmt.Errorf("could not find devices cgroup location")
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}
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// getFullContainerName gets the container name given the root process id of the container.
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// Eg. If the devices cgroup for the container is stored in /sys/fs/cgroup/devices/docker/nginx,
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// return docker/nginx. Assumes that the process is part of exactly one cgroup hierarchy.
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func (pfs *ProcFS) GetFullContainerName(pid int) (string, error) {
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filePath := path.Join("/proc", strconv.Itoa(pid), "cgroup")
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content, err := ioutil.ReadFile(filePath)
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if err != nil {
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if e, ok := err.(*os.SyscallError); ok && os.IsNotExist(e) {
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return "", os.ErrNotExist
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}
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return "", err
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}
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return containerNameFromProcCgroup(string(content))
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}
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