mirror of
https://github.com/go-gitea/gitea.git
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179 lines
5.5 KiB
Go
179 lines
5.5 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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"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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var validOptionalFields = map[string]bool{
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"shared": true,
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"master": true,
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"propagate_from": true,
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"unbindable": true,
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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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// Returns part of the mountinfo line, if it exists, else an empty string.
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func getStringSliceElement(parts []string, idx int, defaultValue string) string {
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if idx >= len(parts) {
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return defaultValue
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}
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return parts[idx]
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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(r io.Reader) ([]*MountInfo, error) {
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mounts := []*MountInfo{}
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scanner := bufio.NewScanner(r)
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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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// OptionalFields can be zero, hence these checks to ensure we do not populate the wrong values in the wrong spots
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separatorIndex := strings.Index(mountString, "-")
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if separatorIndex == -1 {
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return nil, fmt.Errorf("no separator found in mountinfo string: %s", mountString)
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}
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beforeFields := strings.Fields(mountString[:separatorIndex])
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afterFields := strings.Fields(mountString[separatorIndex+1:])
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if (len(beforeFields) + len(afterFields)) < 7 {
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return nil, fmt.Errorf("too few fields")
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}
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mount := &MountInfo{
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MajorMinorVer: getStringSliceElement(beforeFields, 2, ""),
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Root: getStringSliceElement(beforeFields, 3, ""),
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MountPoint: getStringSliceElement(beforeFields, 4, ""),
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Options: mountOptionsParser(getStringSliceElement(beforeFields, 5, "")),
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OptionalFields: nil,
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FSType: getStringSliceElement(afterFields, 0, ""),
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Source: getStringSliceElement(afterFields, 1, ""),
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SuperOptions: mountOptionsParser(getStringSliceElement(afterFields, 2, "")),
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}
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mount.MountId, err = strconv.Atoi(getStringSliceElement(beforeFields, 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(getStringSliceElement(beforeFields, 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 len(beforeFields) > 6 {
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mount.OptionalFields = make(map[string]string)
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optionalFields := beforeFields[6:]
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for _, field := range optionalFields {
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optionSplit := strings.Split(field, ":")
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target, value := optionSplit[0], ""
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if len(optionSplit) == 2 {
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value = optionSplit[1]
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}
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// Checks if the 'keys' in the optional fields in the mountinfo line are acceptable.
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// Allowed 'keys' are shared, master, propagate_from, unbindable.
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if _, ok := validOptionalFields[target]; ok {
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mount.OptionalFields[target] = value
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}
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}
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}
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return mount, nil
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}
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// 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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// Retrieves mountinfo information from `/proc/self/mountinfo`.
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func GetMounts() ([]*MountInfo, error) {
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f, err := os.Open("/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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defer f.Close()
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return parseMountInfo(f)
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}
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// Retrieves mountinfo information from a processes' `/proc/<pid>/mountinfo`.
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func GetProcMounts(pid int) ([]*MountInfo, error) {
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f, err := os.Open(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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defer f.Close()
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return parseMountInfo(f)
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}
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