102 lines
3.2 KiB
Go
102 lines
3.2 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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package resource // import "go.opentelemetry.io/otel/sdk/resource"
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import (
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"encoding/xml"
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"fmt"
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"io"
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"os"
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)
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type plist struct {
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XMLName xml.Name `xml:"plist"`
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Dict dict `xml:"dict"`
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}
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type dict struct {
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Key []string `xml:"key"`
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String []string `xml:"string"`
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}
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// osRelease builds a string describing the operating system release based on the
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// contents of the property list (.plist) system files. If no .plist files are found,
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// or if the required properties to build the release description string are missing,
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// an empty string is returned instead. The generated string resembles the output of
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// the `sw_vers` commandline program, but in a single-line string. For more information
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// about the `sw_vers` program, see: https://www.unix.com/man-page/osx/1/SW_VERS.
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func osRelease() string {
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file, err := getPlistFile()
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if err != nil {
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return ""
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}
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defer file.Close()
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values, err := parsePlistFile(file)
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if err != nil {
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return ""
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}
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return buildOSRelease(values)
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}
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// getPlistFile returns a *os.File pointing to one of the well-known .plist files
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// available on macOS. If no file can be opened, it returns an error.
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func getPlistFile() (*os.File, error) {
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return getFirstAvailableFile([]string{
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"/System/Library/CoreServices/SystemVersion.plist",
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"/System/Library/CoreServices/ServerVersion.plist",
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})
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}
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// parsePlistFile process the file pointed by `file` as a .plist file and returns
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// a map with the key-values for each pair of correlated <key> and <string> elements
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// contained in it.
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func parsePlistFile(file io.Reader) (map[string]string, error) {
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var v plist
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err := xml.NewDecoder(file).Decode(&v)
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if err != nil {
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return nil, err
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}
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if len(v.Dict.Key) != len(v.Dict.String) {
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return nil, fmt.Errorf("the number of <key> and <string> elements doesn't match")
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}
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properties := make(map[string]string, len(v.Dict.Key))
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for i, key := range v.Dict.Key {
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properties[key] = v.Dict.String[i]
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}
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return properties, nil
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}
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// buildOSRelease builds a string describing the OS release based on the properties
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// available on the provided map. It tries to find the `ProductName`, `ProductVersion`
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// and `ProductBuildVersion` properties. If some of these properties are not found,
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// it returns an empty string.
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func buildOSRelease(properties map[string]string) string {
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productName := properties["ProductName"]
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productVersion := properties["ProductVersion"]
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productBuildVersion := properties["ProductBuildVersion"]
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if productName == "" || productVersion == "" || productBuildVersion == "" {
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return ""
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}
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return fmt.Sprintf("%s %s (%s)", productName, productVersion, productBuildVersion)
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}
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