cmdline.go RawHistoryFolder

1// SPDX-License-Identifier: MIT
2
3// Package guest is the code that runs inside a sandbox: `ermite-runner init`
4// (the guest PID 1) and `ermite-runner exec` (the executor).
5package guest
6
7import "strings"
8
9// ParseCmdline splits a kernel command line into key=value pairs; a bare word
10// has the value "". The last occurrence of a key wins. Values may be quoted
11// with double quotes, as the kernel allows.
12func ParseCmdline(s string) map[string]string {
13	out := map[string]string{}
14	for _, f := range splitCmdline(strings.TrimSpace(s)) {
15		k, v, _ := strings.Cut(f, "=")
16		out[k] = strings.Trim(v, `"`)
17	}
18	return out
19}
20
21func splitCmdline(s string) []string {
22	var out []string
23	var b strings.Builder
24	inQuote := false
25	for _, r := range s {
26		switch {
27		case r == '"':
28			inQuote = !inQuote
29			b.WriteRune(r)
30		case (r == ' ' || r == '\t' || r == '\n') && !inQuote:
31			if b.Len() > 0 {
32				out = append(out, b.String())
33				b.Reset()
34			}
35		default:
36			b.WriteRune(r)
37		}
38	}
39	if b.Len() > 0 {
40		out = append(out, b.String())
41	}
42	return out
43}