mirror of
https://github.com/ceph/ceph-csi.git
synced 2025-03-09 08:59:30 +00:00
f87d06ed85
Several packages are only used while running the e2e suite. These packages are less important to update, as the they can not influence the final executable that is part of the Ceph-CSI container-image. By moving these dependencies out of the main Ceph-CSI go.mod, it is easier to identify if a reported CVE affects Ceph-CSI, or only the testing (like most of the Kubernetes CVEs). Signed-off-by: Niels de Vos <ndevos@ibm.com>
99 lines
3.6 KiB
Go
99 lines
3.6 KiB
Go
// Copyright 2020 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package procfs
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import (
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"bufio"
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"bytes"
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"fmt"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// Cgroup models one line from /proc/[pid]/cgroup. Each Cgroup struct describes the placement of a PID inside a
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// specific control hierarchy. The kernel has two cgroup APIs, v1 and v2. v1 has one hierarchy per available resource
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// controller, while v2 has one unified hierarchy shared by all controllers. Regardless of v1 or v2, all hierarchies
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// contain all running processes, so the question answerable with a Cgroup struct is 'where is this process in
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// this hierarchy' (where==what path on the specific cgroupfs). By prefixing this path with the mount point of
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// *this specific* hierarchy, you can locate the relevant pseudo-files needed to read/set the data for this PID
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// in this hierarchy
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//
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// Also see http://man7.org/linux/man-pages/man7/cgroups.7.html
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type Cgroup struct {
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// HierarchyID that can be matched to a named hierarchy using /proc/cgroups. Cgroups V2 only has one
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// hierarchy, so HierarchyID is always 0. For cgroups v1 this is a unique ID number
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HierarchyID int
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// Controllers using this hierarchy of processes. Controllers are also known as subsystems. For
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// Cgroups V2 this may be empty, as all active controllers use the same hierarchy
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Controllers []string
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// Path of this control group, relative to the mount point of the cgroupfs representing this specific
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// hierarchy
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Path string
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}
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// parseCgroupString parses each line of the /proc/[pid]/cgroup file
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// Line format is hierarchyID:[controller1,controller2]:path.
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func parseCgroupString(cgroupStr string) (*Cgroup, error) {
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var err error
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fields := strings.SplitN(cgroupStr, ":", 3)
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if len(fields) < 3 {
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return nil, fmt.Errorf("%w: 3+ fields required, found %d fields in cgroup string: %s", ErrFileParse, len(fields), cgroupStr)
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}
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cgroup := &Cgroup{
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Path: fields[2],
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Controllers: nil,
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}
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cgroup.HierarchyID, err = strconv.Atoi(fields[0])
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if err != nil {
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return nil, fmt.Errorf("%w: hierarchy ID: %q", ErrFileParse, cgroup.HierarchyID)
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}
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if fields[1] != "" {
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ssNames := strings.Split(fields[1], ",")
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cgroup.Controllers = append(cgroup.Controllers, ssNames...)
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}
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return cgroup, nil
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}
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// parseCgroups reads each line of the /proc/[pid]/cgroup file.
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func parseCgroups(data []byte) ([]Cgroup, error) {
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var cgroups []Cgroup
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scanner := bufio.NewScanner(bytes.NewReader(data))
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for scanner.Scan() {
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mountString := scanner.Text()
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parsedMounts, err := parseCgroupString(mountString)
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if err != nil {
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return nil, err
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}
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cgroups = append(cgroups, *parsedMounts)
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}
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err := scanner.Err()
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return cgroups, err
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}
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// Cgroups reads from /proc/<pid>/cgroups and returns a []*Cgroup struct locating this PID in each process
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// control hierarchy running on this system. On every system (v1 and v2), all hierarchies contain all processes,
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// so the len of the returned struct is equal to the number of active hierarchies on this system.
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func (p Proc) Cgroups() ([]Cgroup, error) {
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data, err := util.ReadFileNoStat(p.path("cgroup"))
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if err != nil {
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return nil, err
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}
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return parseCgroups(data)
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}
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