mirror of https://github.com/docker/cli.git
80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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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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"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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unix.ByteSliceToString(utsName.Sysname[:]),
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unix.ByteSliceToString(utsName.Nodename[:]),
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unix.ByteSliceToString(utsName.Release[:]),
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unix.ByteSliceToString(utsName.Version[:]),
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unix.ByteSliceToString(utsName.Machine[:]),
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), nil
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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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