// osRelease builds a string describing the operating system release based on the // properties of the os-release file. If no os-release file is found, or if the // required properties to build the release description string are missing, an empty // string is returned instead. For more information about os-release files, see: // https://www.freedesktop.org/software/systemd/man/os-release.html func osRelease() string { … } // getOSReleaseFile returns a *os.File pointing to one of the well-known os-release // files, according to their order of preference. If no file can be opened, it // returns an error. func getOSReleaseFile() (*os.File, error) { … } // parseOSReleaseFile process the file pointed by `file` as an os-release file and // returns a map with the key-values contained in it. Empty lines or lines starting // with a '#' character are ignored, as well as lines with the missing key=value // separator. Values are unquoted and unescaped. func parseOSReleaseFile(file io.Reader) map[string]string { … } // skip returns true if the line is blank or starts with a '#' character, and // therefore should be skipped from processing. func skip(line string) bool { … } // parse attempts to split the provided line on the first '=' character, and then // sanitize each side of the split before returning them as a key-value pair. func parse(line string) (string, string, bool) { … } // unquote checks whether the string `s` is quoted with double or single quotes // and, if so, returns a version of the string without them. Otherwise it returns // the provided string unchanged. func unquote(s string) string { … } // unescape removes the `\` prefix from some characters that are expected // to have it added in front of them for escaping purposes. func unescape(s string) string { … } // buildOSRelease builds a string describing the OS release based on the properties // available on the provided map. It favors a combination of the `NAME` and `VERSION` // properties as first option (falling back to `VERSION_ID` if `VERSION` isn't // found), and using `PRETTY_NAME` alone if some of the previous are not present. If // none of these properties are found, it returns an empty string. // // The rationale behind not using `PRETTY_NAME` as first choice was that, for some // Linux distributions, it doesn't include the same detail that can be found on the // individual `NAME` and `VERSION` properties, and combining `PRETTY_NAME` with // other properties can produce "pretty" redundant strings in some cases. func buildOSRelease(values map[string]string) string { … }
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