mirror of
https://github.com/TwiN/gatus.git
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181 lines
5.2 KiB
Go
181 lines
5.2 KiB
Go
// Copyright 2019 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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// A MountInfo is a type that describes the details, options
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// for each mount, parsed from /proc/self/mountinfo.
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// The fields described in each entry of /proc/self/mountinfo
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// is described in the following man page.
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// http://man7.org/linux/man-pages/man5/proc.5.html
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type MountInfo struct {
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// Unique ID for the mount
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MountID int
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// The ID of the parent mount
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ParentID int
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// The value of `st_dev` for the files on this FS
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MajorMinorVer string
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// The pathname of the directory in the FS that forms
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// the root for this mount
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Root string
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// The pathname of the mount point relative to the root
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MountPoint string
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// Mount options
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Options map[string]string
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// Zero or more optional fields
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OptionalFields map[string]string
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// The Filesystem type
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FSType string
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// FS specific information or "none"
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Source string
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// Superblock options
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SuperOptions map[string]string
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}
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// Reads each line of the mountinfo file, and returns a list of formatted MountInfo structs.
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func parseMountInfo(info []byte) ([]*MountInfo, error) {
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mounts := []*MountInfo{}
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scanner := bufio.NewScanner(bytes.NewReader(info))
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for scanner.Scan() {
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mountString := scanner.Text()
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parsedMounts, err := parseMountInfoString(mountString)
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if err != nil {
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return nil, err
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}
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mounts = append(mounts, parsedMounts)
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}
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err := scanner.Err()
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return mounts, err
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}
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// Parses a mountinfo file line, and converts it to a MountInfo struct.
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// An important check here is to see if the hyphen separator, as if it does not exist,
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// it means that the line is malformed.
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func parseMountInfoString(mountString string) (*MountInfo, error) {
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var err error
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mountInfo := strings.Split(mountString, " ")
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mountInfoLength := len(mountInfo)
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if mountInfoLength < 10 {
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return nil, fmt.Errorf("couldn't find enough fields in mount string: %s", mountString)
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}
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if mountInfo[mountInfoLength-4] != "-" {
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return nil, fmt.Errorf("couldn't find separator in expected field: %s", mountInfo[mountInfoLength-4])
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}
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mount := &MountInfo{
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MajorMinorVer: mountInfo[2],
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Root: mountInfo[3],
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MountPoint: mountInfo[4],
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Options: mountOptionsParser(mountInfo[5]),
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OptionalFields: nil,
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FSType: mountInfo[mountInfoLength-3],
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Source: mountInfo[mountInfoLength-2],
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SuperOptions: mountOptionsParser(mountInfo[mountInfoLength-1]),
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}
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mount.MountID, err = strconv.Atoi(mountInfo[0])
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if err != nil {
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return nil, fmt.Errorf("failed to parse mount ID")
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}
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mount.ParentID, err = strconv.Atoi(mountInfo[1])
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if err != nil {
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return nil, fmt.Errorf("failed to parse parent ID")
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}
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// Has optional fields, which is a space separated list of values.
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// Example: shared:2 master:7
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if mountInfo[6] != "" {
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mount.OptionalFields, err = mountOptionsParseOptionalFields(mountInfo[6 : mountInfoLength-4])
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if err != nil {
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return nil, err
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}
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}
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return mount, nil
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}
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// mountOptionsIsValidField checks a string against a valid list of optional fields keys.
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func mountOptionsIsValidField(s string) bool {
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switch s {
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case
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"shared",
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"master",
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"propagate_from",
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"unbindable":
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return true
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}
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return false
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}
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// mountOptionsParseOptionalFields parses a list of optional fields strings into a double map of strings.
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func mountOptionsParseOptionalFields(o []string) (map[string]string, error) {
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optionalFields := make(map[string]string)
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for _, field := range o {
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optionSplit := strings.SplitN(field, ":", 2)
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value := ""
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if len(optionSplit) == 2 {
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value = optionSplit[1]
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}
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if mountOptionsIsValidField(optionSplit[0]) {
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optionalFields[optionSplit[0]] = value
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}
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}
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return optionalFields, nil
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}
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// mountOptionsParser parses the mount options, superblock options.
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func mountOptionsParser(mountOptions string) map[string]string {
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opts := make(map[string]string)
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options := strings.Split(mountOptions, ",")
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for _, opt := range options {
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splitOption := strings.Split(opt, "=")
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if len(splitOption) < 2 {
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key := splitOption[0]
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opts[key] = ""
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} else {
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key, value := splitOption[0], splitOption[1]
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opts[key] = value
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}
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}
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return opts
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}
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// GetMounts retrieves mountinfo information from `/proc/self/mountinfo`.
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func GetMounts() ([]*MountInfo, error) {
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data, err := util.ReadFileNoStat("/proc/self/mountinfo")
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if err != nil {
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return nil, err
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}
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return parseMountInfo(data)
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}
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// GetProcMounts retrieves mountinfo information from a processes' `/proc/<pid>/mountinfo`.
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func GetProcMounts(pid int) ([]*MountInfo, error) {
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data, err := util.ReadFileNoStat(fmt.Sprintf("/proc/%d/mountinfo", pid))
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if err != nil {
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return nil, err
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}
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return parseMountInfo(data)
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}
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