// Copyright 2017 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 runtime

import (
	"bytes"

	"golang.org/x/sys/unix"
)

// Uname returns the uname of the host machine.
func Uname() string {
	buf := unix.Utsname{}
	err := unix.Uname(&buf)
	if err != nil {
		panic("unix.Uname failed: " + err.Error())
	}

	str := "(" + string(buf.Sysname[:bytes.IndexByte(buf.Sysname[:], 0)])
	str += " " + string(buf.Release[:bytes.IndexByte(buf.Release[:], 0)])
	str += " " + string(buf.Version[:bytes.IndexByte(buf.Version[:], 0)])
	str += " " + string(buf.Machine[:bytes.IndexByte(buf.Machine[:], 0)])
	str += " " + string(buf.Nodename[:bytes.IndexByte(buf.Nodename[:], 0)])
	str += " " + string(buf.Domainname[:bytes.IndexByte(buf.Domainname[:], 0)]) + ")"
	return str
}