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1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org> | |
3 | ;;; | |
4 | ;;; This file is part of GNU Guix. | |
5 | ;;; | |
6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
7 | ;;; under the terms of the GNU General Public License as published by | |
8 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
9 | ;;; your option) any later version. | |
10 | ;;; | |
11 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;;; GNU General Public License for more details. | |
15 | ;;; | |
16 | ;;; You should have received a copy of the GNU General Public License | |
17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
18 | ||
19 | (define-module (guix build linux-initrd) | |
20 | #:use-module (rnrs io ports) | |
21 | #:use-module (system foreign) | |
22 | #:export (mount-essential-file-systems | |
23 | linux-command-line | |
24 | configure-qemu-networking | |
25 | mount-qemu-smb-share | |
26 | load-linux-module* | |
27 | device-number)) | |
28 | ||
29 | ;;; Commentary: | |
30 | ;;; | |
31 | ;;; Utility procedures useful in a Linux initial RAM disk (initrd). Note that | |
32 | ;;; many of these use procedures not yet available in vanilla Guile (`mount', | |
33 | ;;; `load-linux-module', etc.); these are provided by a Guile patch used in | |
34 | ;;; the GNU distribution. | |
35 | ;;; | |
36 | ;;; Code: | |
37 | ||
38 | (define* (mount-essential-file-systems #:key (root "/")) | |
39 | "Mount /proc and /sys under ROOT." | |
40 | (define (scope dir) | |
41 | (string-append root | |
42 | (if (string-suffix? "/" root) | |
43 | "" | |
44 | "/") | |
45 | dir)) | |
46 | ||
47 | (unless (file-exists? (scope "proc")) | |
48 | (mkdir (scope "proc"))) | |
49 | (mount "none" (scope "proc") "proc") | |
50 | ||
51 | (unless (file-exists? (scope "sys")) | |
52 | (mkdir (scope "sys"))) | |
53 | (mount "none" (scope "sys") "sysfs")) | |
54 | ||
55 | (define (linux-command-line) | |
56 | "Return the Linux kernel command line as a list of strings." | |
57 | (string-tokenize | |
58 | (call-with-input-file "/proc/cmdline" | |
59 | get-string-all))) | |
60 | ||
61 | (define %host-qemu-ipv4-address | |
62 | (inet-pton AF_INET "10.0.2.10")) | |
63 | ||
64 | (define* (configure-qemu-networking #:optional (interface "eth0")) | |
65 | "Setup the INTERFACE network interface and /etc/resolv.conf according to | |
66 | QEMU's default networking settings (see net/slirp.c in QEMU for default | |
67 | networking values.) Return #t if INTERFACE is up, #f otherwise." | |
68 | (display "configuring QEMU networking...\n") | |
69 | (let* ((sock (socket AF_INET SOCK_STREAM 0)) | |
70 | (address (make-socket-address AF_INET %host-qemu-ipv4-address 0)) | |
71 | (flags (network-interface-flags sock interface))) | |
72 | (set-network-interface-address sock interface address) | |
73 | (set-network-interface-flags sock interface (logior flags IFF_UP)) | |
74 | ||
75 | (unless (file-exists? "/etc") | |
76 | (mkdir "/etc")) | |
77 | (call-with-output-file "/etc/resolv.conf" | |
78 | (lambda (p) | |
79 | (display "nameserver 10.0.2.3\n" p))) | |
80 | ||
81 | (logand (network-interface-flags sock interface) IFF_UP))) | |
82 | ||
83 | (define (mount-qemu-smb-share share mount-point) | |
84 | "Mount QEMU's CIFS/SMB SHARE at MOUNT-POINT. | |
85 | ||
86 | Vanilla QEMU's `-smb' option just exports a /qemu share, whereas our | |
87 | `qemu-with-multiple-smb-shares' package exports the /xchg and /store shares | |
88 | (the latter allows the store to be shared between the host and guest.)" | |
89 | ||
90 | (format #t "mounting QEMU's SMB share `~a'...\n" share) | |
91 | (let ((server "10.0.2.4")) | |
92 | (mount (string-append "//" server share) mount-point "cifs" 0 | |
93 | (string->pointer "guest,sec=none")))) | |
94 | ||
95 | (define (load-linux-module* file) | |
96 | "Load Linux module from FILE, the name of a `.ko' file." | |
97 | (define (slurp module) | |
98 | (call-with-input-file file get-bytevector-all)) | |
99 | ||
100 | (load-linux-module (slurp file))) | |
101 | ||
102 | (define (device-number major minor) | |
103 | "Return the device number for the device with MAJOR and MINOR, for use as | |
104 | the last argument of `mknod'." | |
105 | (+ (* major 256) minor)) | |
106 | ||
107 | ;;; linux-initrd.scm ends here |