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// 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.
// +build darwin freebsd openbsd
// +build !nouname
package collector
import (
"bytes"
"strings"
"golang.org/x/sys/unix"
)
func getUname() (uname, error) {
var utsname unix.Utsname
if err := unix.Uname(&utsname); err != nil {
return uname{}, err
}
nodeName, domainName := parseHostNameAndDomainName(utsname)
output := uname{
SysName: string(utsname.Sysname[:bytes.IndexByte(utsname.Sysname[:], 0)]),
Release: string(utsname.Release[:bytes.IndexByte(utsname.Release[:], 0)]),
Version: string(utsname.Version[:bytes.IndexByte(utsname.Version[:], 0)]),
Machine: string(utsname.Machine[:bytes.IndexByte(utsname.Machine[:], 0)]),
NodeName: nodeName,
DomainName: domainName,
}
return output, nil
}
// parseHostNameAndDomainName for FreeBSD,OpenBSD,Darwin.
// Attempts to emulate what happens in the Linux uname calls since these OS doesn't have a Domainname.
func parseHostNameAndDomainName(utsname unix.Utsname) (hostname string, domainname string) {
nodename := string(utsname.Nodename[:bytes.IndexByte(utsname.Nodename[:], 0)])
split := strings.SplitN(nodename, ".", 2)
// We'll always have at least a single element in the array. We assume this
// is the hostname.
hostname = split[0]
// If we have more than one element, we assume this is the domainname.
// Otherwise leave it to "(none)" like Linux.
domainname = "(none)"
if len(split) > 1 {
domainname = split[1]
}
return hostname, domainname
}
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