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https://github.com/ceph/ceph-csi.git
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bc8b1e792f
Many reports are about closing or removing files. In some cases it is possible to report an error in the logs, in other cases the error can be ignored without potential issues. Test cases have been modified to not remove the temporary files. The temporary directory that is provided by the testing package, is removed once the tests are done. Signed-off-by: Niels de Vos <ndevos@ibm.com>
138 lines
3.3 KiB
Go
138 lines
3.3 KiB
Go
/*
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Copyright 2019 The Ceph-CSI 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 util
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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)
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const (
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procCgroup = "/proc/self/cgroup"
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sysPidsMaxFmtCgroupV1 = "/sys/fs/cgroup/pids%s/pids.max"
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sysPidsMaxFmtCgroupV2 = "/sys/fs/cgroup%s/pids.max"
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)
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// getCgroupPidsFile return the cgroups "pids.max" file of the
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// current process
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// For cgroup v1, find the line containing the pids group from the /proc/self/cgroup file
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// $ grep ':pids:' /proc/self/cgroup
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// 7:pids:/kubepods.slice/kubepods-besteffort.slice/....scope
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// $ cat /sys/fs/cgroup/pids + *.scope + /pids.max.
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// The entry for cgroup v2 is always in the format "0::...scope", no subsystem given.
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// (see https://www.kernel.org/doc/Documentation/cgroup-v2.txt)
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func getCgroupPidsFile() (string, error) {
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cgroup, err := os.Open(procCgroup)
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if err != nil {
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return "", err
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}
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defer cgroup.Close() //nolint:errcheck,nosec // error on close is not critical here
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pidsMax := ""
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scanner := bufio.NewScanner(cgroup)
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var slice string
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for scanner.Scan() {
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parts := strings.SplitN(scanner.Text(), ":", 3)
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if parts == nil || len(parts) < 3 {
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continue
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}
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// No cgroup subsystem given, then it is cgroupv2
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if parts[0] == "0" && parts[1] == "" {
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slice = parts[2]
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pidsMax = fmt.Sprintf(sysPidsMaxFmtCgroupV2, slice)
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break
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}
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if parts[1] == "pids" {
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slice = parts[2]
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pidsMax = fmt.Sprintf(sysPidsMaxFmtCgroupV1, slice)
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break
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}
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}
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if slice == "" {
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return "", errors.New("could not find a cgroup for 'pids'")
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}
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return pidsMax, nil
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}
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// GetPIDLimit returns the current PID limit, or an error. A value of -1
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// translates to "max".
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func GetPIDLimit() (int, error) {
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pidsMax, err := getCgroupPidsFile()
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if err != nil {
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return 0, err
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}
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f, err := os.Open(pidsMax) // #nosec - intended reading from /sys/...
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if err != nil {
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return 0, err
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}
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defer f.Close() //nolint:errcheck,nosec // error on close is not critical here
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maxPidsStr, err := bufio.NewReader(f).ReadString('\n')
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if err != nil && !errors.Is(err, io.EOF) {
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return 0, err
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}
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maxPidsStr = strings.TrimRight(maxPidsStr, "\n")
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maxPids := -1
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if maxPidsStr != "max" {
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maxPids, err = strconv.Atoi(maxPidsStr)
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if err != nil {
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return 0, err
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}
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}
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return maxPids, nil
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}
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// SetPIDLimit configures the given PID limit for the current process. A value
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// of -1 translates to "max".
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func SetPIDLimit(limit int) error {
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limitStr := "max"
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if limit != -1 {
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limitStr = strconv.Itoa(limit)
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}
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pidsMax, err := getCgroupPidsFile()
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if err != nil {
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return err
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}
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//nolint:gosec // pidsMax is the intended file to use
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f, err := os.Create(pidsMax)
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if err != nil {
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return err
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}
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_, err = f.WriteString(limitStr)
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if err != nil {
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f.Close() //nolint:errcheck,gosec // a write error will be more useful to return
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return err
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}
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return f.Close()
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}
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