77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
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package main
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import (
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"bufio"
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"os"
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"strings"
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)
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// OSInfo holds the detected distribution identity and init system.
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type OSInfo struct {
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ID string
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Version string
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Init string // "systemd" or "openrc"
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}
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// detectOS parses /etc/os-release and maps the distro to its init system.
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func detectOS() *OSInfo {
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f, err := os.Open("/etc/os-release")
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if err != nil {
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die("Cannot detect OS: /etc/os-release not found")
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}
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defer f.Close()
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vals := map[string]string{}
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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if line == "" || strings.HasPrefix(line, "#") {
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continue
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}
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if i := strings.Index(line, "="); i >= 0 {
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key := strings.TrimSpace(line[:i])
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vals[key] = unquoteShell(line[i+1:])
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}
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}
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osInfo := &OSInfo{
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ID: valueOr(vals["ID"], "unknown"),
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Version: valueOr(vals["VERSION_ID"], "unknown"),
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}
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switch osInfo.ID {
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case "ubuntu", "debian", "linuxmint":
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osInfo.Init = "systemd"
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case "alpine":
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osInfo.Init = "openrc"
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default:
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die("Unsupported OS: %s (supported: ubuntu, debian, linuxmint, alpine)", osInfo.ID)
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}
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// A systemd-based distro may still be running here without systemd as
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// PID 1 — the container case (e.g. the Linux Mint image used for the
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// alternative container build). systemd creates /run/systemd/system only
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// when it is actually active as the init system, so its absence is the
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// standard way to detect this. Fall back to driving awg-quick directly,
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// same as the Alpine/OpenRC path.
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if osInfo.Init == "systemd" && !systemdRunning() {
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osInfo.Init = "openrc"
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}
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info("Detected OS: %s %s (init: %s)", osInfo.ID, osInfo.Version, osInfo.Init)
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return osInfo
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}
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// systemdRunning reports whether systemd is active as PID 1.
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func systemdRunning() bool {
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_, err := os.Stat("/run/systemd/system")
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return err == nil
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}
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func valueOr(v, def string) string {
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if v == "" {
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return def
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}
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return v
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}
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