/
hardware_linux.go
119 lines (101 loc) · 2.63 KB
/
hardware_linux.go
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// +build linux
/*
* Copyright (C) 2018 Red Hat, Inc.
*
* 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 ofthe 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 specificlanguage governing permissions and
* limitations under the License.
*
*/
package hardware
import (
"fmt"
"io/ioutil"
"os"
"strconv"
"strings"
)
func toString(buffer []byte) string {
str := strings.TrimSpace(string(buffer))
str = strings.TrimRightFunc(str, func(c rune) bool {
return c == '\r' || c == '\n'
})
return str
}
func parseIsolatedCPUs(str string) ([]int64, error) {
if str == "" {
return nil, nil
}
list := strings.Split(str, ",")
var isolated []int64
for _, el := range list {
// range
if strings.Contains(el, "-") {
rg := strings.Split(el, "-")
if len(rg) != 2 {
return nil, fmt.Errorf("Range error: %s", el)
}
start, err := strconv.Atoi(rg[0])
if err != nil {
return nil, fmt.Errorf("Range error: %s", el)
}
end, err := strconv.Atoi(rg[1])
if err != nil {
return nil, fmt.Errorf("Range error: %s", el)
}
if start > end {
return nil, fmt.Errorf("Range error: %s", el)
}
for i := start; i <= end; i++ {
isolated = append(isolated, int64(i))
}
} else {
v, err := strconv.Atoi(el)
if err != nil {
return nil, fmt.Errorf("Value error: %s", el)
}
isolated = append(isolated, int64(v))
}
}
return isolated, nil
}
func getIsolatedCPUs() ([]int64, error) {
buffer, err := ioutil.ReadFile("/sys/devices/system/cpu/isolated")
if err != nil {
return nil, err
}
return parseIsolatedCPUs(toString(buffer))
}
func getInstanceID() (string, error) {
buffer, err := ioutil.ReadFile("/var/lib/cloud/data/instance-id")
if err != nil {
if os.IsNotExist(err) {
return "", nil
}
return "", err
}
return toString(buffer), nil
}
func getKernelCmd() (map[string]interface{}, error) {
cmdline, err := ioutil.ReadFile("/proc/cmdline")
if err != nil {
return nil, err
}
kernelArgs := make(map[string]interface{})
for _, arg := range strings.Split(string(cmdline), " ") {
if splitted := strings.SplitN(arg, "=", 2); len(splitted) == 1 {
kernelArgs[strings.TrimSpace(splitted[0])] = true
} else {
kernelArgs[strings.TrimSpace(splitted[0])] = strings.TrimSpace(splitted[1])
}
}
return kernelArgs, nil
}