[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/prometheus/procfs/mountinfo.go b/vendor/github.com/prometheus/procfs/mountinfo.go
new file mode 100644
index 0000000..59f4d50
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/mountinfo.go
@@ -0,0 +1,180 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "strconv"
+ "strings"
+
+ "github.com/prometheus/procfs/internal/util"
+)
+
+// A MountInfo is a type that describes the details, options
+// for each mount, parsed from /proc/self/mountinfo.
+// The fields described in each entry of /proc/self/mountinfo
+// is described in the following man page.
+// http://man7.org/linux/man-pages/man5/proc.5.html
+type MountInfo struct {
+ // Unique ID for the mount
+ MountID int
+ // The ID of the parent mount
+ ParentID int
+ // The value of `st_dev` for the files on this FS
+ MajorMinorVer string
+ // The pathname of the directory in the FS that forms
+ // the root for this mount
+ Root string
+ // The pathname of the mount point relative to the root
+ MountPoint string
+ // Mount options
+ Options map[string]string
+ // Zero or more optional fields
+ OptionalFields map[string]string
+ // The Filesystem type
+ FSType string
+ // FS specific information or "none"
+ Source string
+ // Superblock options
+ SuperOptions map[string]string
+}
+
+// Reads each line of the mountinfo file, and returns a list of formatted MountInfo structs.
+func parseMountInfo(info []byte) ([]*MountInfo, error) {
+ mounts := []*MountInfo{}
+ scanner := bufio.NewScanner(bytes.NewReader(info))
+ for scanner.Scan() {
+ mountString := scanner.Text()
+ parsedMounts, err := parseMountInfoString(mountString)
+ if err != nil {
+ return nil, err
+ }
+ mounts = append(mounts, parsedMounts)
+ }
+
+ err := scanner.Err()
+ return mounts, err
+}
+
+// Parses a mountinfo file line, and converts it to a MountInfo struct.
+// An important check here is to see if the hyphen separator, as if it does not exist,
+// it means that the line is malformed.
+func parseMountInfoString(mountString string) (*MountInfo, error) {
+ var err error
+
+ mountInfo := strings.Split(mountString, " ")
+ mountInfoLength := len(mountInfo)
+ if mountInfoLength < 10 {
+ return nil, fmt.Errorf("couldn't find enough fields in mount string: %s", mountString)
+ }
+
+ if mountInfo[mountInfoLength-4] != "-" {
+ return nil, fmt.Errorf("couldn't find separator in expected field: %s", mountInfo[mountInfoLength-4])
+ }
+
+ mount := &MountInfo{
+ MajorMinorVer: mountInfo[2],
+ Root: mountInfo[3],
+ MountPoint: mountInfo[4],
+ Options: mountOptionsParser(mountInfo[5]),
+ OptionalFields: nil,
+ FSType: mountInfo[mountInfoLength-3],
+ Source: mountInfo[mountInfoLength-2],
+ SuperOptions: mountOptionsParser(mountInfo[mountInfoLength-1]),
+ }
+
+ mount.MountID, err = strconv.Atoi(mountInfo[0])
+ if err != nil {
+ return nil, fmt.Errorf("failed to parse mount ID")
+ }
+ mount.ParentID, err = strconv.Atoi(mountInfo[1])
+ if err != nil {
+ return nil, fmt.Errorf("failed to parse parent ID")
+ }
+ // Has optional fields, which is a space separated list of values.
+ // Example: shared:2 master:7
+ if mountInfo[6] != "" {
+ mount.OptionalFields, err = mountOptionsParseOptionalFields(mountInfo[6 : mountInfoLength-4])
+ if err != nil {
+ return nil, err
+ }
+ }
+ return mount, nil
+}
+
+// mountOptionsIsValidField checks a string against a valid list of optional fields keys.
+func mountOptionsIsValidField(s string) bool {
+ switch s {
+ case
+ "shared",
+ "master",
+ "propagate_from",
+ "unbindable":
+ return true
+ }
+ return false
+}
+
+// mountOptionsParseOptionalFields parses a list of optional fields strings into a double map of strings.
+func mountOptionsParseOptionalFields(o []string) (map[string]string, error) {
+ optionalFields := make(map[string]string)
+ for _, field := range o {
+ optionSplit := strings.SplitN(field, ":", 2)
+ value := ""
+ if len(optionSplit) == 2 {
+ value = optionSplit[1]
+ }
+ if mountOptionsIsValidField(optionSplit[0]) {
+ optionalFields[optionSplit[0]] = value
+ }
+ }
+ return optionalFields, nil
+}
+
+// mountOptionsParser parses the mount options, superblock options.
+func mountOptionsParser(mountOptions string) map[string]string {
+ opts := make(map[string]string)
+ options := strings.Split(mountOptions, ",")
+ for _, opt := range options {
+ splitOption := strings.Split(opt, "=")
+ if len(splitOption) < 2 {
+ key := splitOption[0]
+ opts[key] = ""
+ } else {
+ key, value := splitOption[0], splitOption[1]
+ opts[key] = value
+ }
+ }
+ return opts
+}
+
+// GetMounts retrieves mountinfo information from `/proc/self/mountinfo`.
+func GetMounts() ([]*MountInfo, error) {
+ data, err := util.ReadFileNoStat("/proc/self/mountinfo")
+ if err != nil {
+ return nil, err
+ }
+ return parseMountInfo(data)
+}
+
+// GetProcMounts retrieves mountinfo information from a processes' `/proc/<pid>/mountinfo`.
+func GetProcMounts(pid int) ([]*MountInfo, error) {
+ data, err := util.ReadFileNoStat(fmt.Sprintf("/proc/%d/mountinfo", pid))
+ if err != nil {
+ return nil, err
+ }
+ return parseMountInfo(data)
+}