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101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
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// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
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package resource // import "go.opentelemetry.io/otel/sdk/resource"
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import (
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"bytes"
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"fmt"
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"os"
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"golang.org/x/sys/unix"
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)
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type unameProvider func(buf *unix.Utsname) (err error)
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var defaultUnameProvider unameProvider = unix.Uname
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var currentUnameProvider = defaultUnameProvider
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func setDefaultUnameProvider() {
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setUnameProvider(defaultUnameProvider)
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}
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func setUnameProvider(unameProvider unameProvider) {
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currentUnameProvider = unameProvider
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}
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// platformOSDescription returns a human readable OS version information string.
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// The final string combines OS release information (where available) and the
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// result of the `uname` system call.
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func platformOSDescription() (string, error) {
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uname, err := uname()
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if err != nil {
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return "", err
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}
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osRelease := osRelease()
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if osRelease != "" {
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return fmt.Sprintf("%s (%s)", osRelease, uname), nil
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}
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return uname, nil
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}
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// uname issues a uname(2) system call (or equivalent on systems which doesn't
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// have one) and formats the output in a single string, similar to the output
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// of the `uname` commandline program. The final string resembles the one
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// obtained with a call to `uname -snrvm`.
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func uname() (string, error) {
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var utsName unix.Utsname
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err := currentUnameProvider(&utsName)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("%s %s %s %s %s",
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charsToString(utsName.Sysname[:]),
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charsToString(utsName.Nodename[:]),
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charsToString(utsName.Release[:]),
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charsToString(utsName.Version[:]),
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charsToString(utsName.Machine[:]),
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), nil
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}
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// charsToString converts a C-like null-terminated char array to a Go string.
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func charsToString(charArray []byte) string {
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if i := bytes.IndexByte(charArray, 0); i >= 0 {
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charArray = charArray[:i]
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}
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return string(charArray)
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}
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// getFirstAvailableFile returns an *os.File of the first available
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// file from a list of candidate file paths.
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func getFirstAvailableFile(candidates []string) (*os.File, error) {
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for _, c := range candidates {
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file, err := os.Open(c)
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if err == nil {
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return file, nil
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}
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}
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return nil, fmt.Errorf("no candidate file available: %v", candidates)
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}
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