// Copyright 2018 psgo 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 proc

import (
	"fmt"
	"os"
)

// ParsePIDNamespace returns the content of /proc/$pid/ns/pid.
func ParsePIDNamespace(pid string) (string, error) {
	pidNS, err := os.Readlink(fmt.Sprintf("/proc/%s/ns/pid", pid))
	if err != nil {
		return "", err
	}
	return pidNS, nil
}

// ParseUserNamespace returns the content of /proc/$pid/ns/user.
func ParseUserNamespace(pid string) (string, error) {
	userNS, err := os.Readlink(fmt.Sprintf("/proc/%s/ns/user", pid))
	if err != nil {
		return "", err
	}
	return userNS, nil
}