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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
package resource // import "go.opentelemetry.io/otel/sdk/resource"
import (
"fmt"
"os"
"golang.org/x/sys/unix"
)
type unameProvider func(buf *unix.Utsname) (err error)
var defaultUnameProvider unameProvider = unix.Uname
var currentUnameProvider = defaultUnameProvider
func setDefaultUnameProvider() {
setUnameProvider(defaultUnameProvider)
}
func setUnameProvider(unameProvider unameProvider) {
currentUnameProvider = unameProvider
}
// platformOSDescription returns a human readable OS version information string.
// The final string combines OS release information (where available) and the
// result of the `uname` system call.
func platformOSDescription() (string, error) {
uname, err := uname()
if err != nil {
return "", err
}
osRelease := osRelease()
if osRelease != "" {
return fmt.Sprintf("%s (%s)", osRelease, uname), nil
}
return uname, nil
}
// uname issues a uname(2) system call (or equivalent on systems which doesn't
// have one) and formats the output in a single string, similar to the output
// of the `uname` commandline program. The final string resembles the one
// obtained with a call to `uname -snrvm`.
func uname() (string, error) {
var utsName unix.Utsname
err := currentUnameProvider(&utsName)
if err != nil {
return "", err
}
return fmt.Sprintf("%s %s %s %s %s",
unix.ByteSliceToString(utsName.Sysname[:]),
unix.ByteSliceToString(utsName.Nodename[:]),
unix.ByteSliceToString(utsName.Release[:]),
unix.ByteSliceToString(utsName.Version[:]),
unix.ByteSliceToString(utsName.Machine[:]),
), nil
}
// getFirstAvailableFile returns an *os.File of the first available
// file from a list of candidate file paths.
func getFirstAvailableFile(candidates []string) (*os.File, error) {
for _, c := range candidates {
file, err := os.Open(c)
if err == nil {
return file, nil
}
}
return nil, fmt.Errorf("no candidate file available: %v", candidates)
}
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