110 lines
3.0 KiB
Go
110 lines
3.0 KiB
Go
/*
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Copyright 2015 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 procfs
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import (
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"bytes"
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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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"path/filepath"
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"strconv"
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"strings"
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"unicode"
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"github.com/golang/glog"
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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 os.IsNotExist(err) {
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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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func PidOf(name string) []int {
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pids := []int{}
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filepath.Walk("/proc", func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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base := filepath.Base(path)
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// Traverse only the directories we are interested in
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if info.IsDir() && path != "/proc" {
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// If the directory is not a number (i.e. not a PID), skip it
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if _, err := strconv.Atoi(base); err != nil {
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return filepath.SkipDir
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}
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}
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if base != "cmdline" {
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return nil
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}
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cmdline, err := ioutil.ReadFile(path)
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if err != nil {
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glog.V(4).Infof("Error reading file %s: %+v", path, err)
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return nil
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}
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// The bytes we read have '\0' as a separator for the command line
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parts := bytes.SplitN(cmdline, []byte{0}, 2)
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if len(parts) == 0 {
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return nil
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}
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// Split the command line itself we are interested in just the first part
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exe := strings.FieldsFunc(string(parts[0]), func(c rune) bool {
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return unicode.IsSpace(c) || c == ':'
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})
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if len(exe) == 0 {
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return nil
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}
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// Check if the name of the executable is what we are looking for
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if filepath.Base(exe[0]) == name {
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dirname := filepath.Base(filepath.Dir(path))
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// Grab the PID from the directory path
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pid, _ := strconv.Atoi(dirname)
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pids = append(pids, pid)
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}
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return nil
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})
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return pids
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}
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