blob: b5404da7f037fc5de4d20bfc0ff9bb00842001f9 (
about) (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix build linux-initrd)
#:use-module (rnrs io ports)
#:use-module (system foreign)
#:export (mount-essential-file-systems
linux-command-line
make-essential-device-nodes
configure-qemu-networking
mount-qemu-smb-share
bind-mount
load-linux-module*
device-number))
;;; Commentary:
;;;
;;; Utility procedures useful in a Linux initial RAM disk (initrd). Note that
;;; many of these use procedures not yet available in vanilla Guile (`mount',
;;; `load-linux-module', etc.); these are provided by a Guile patch used in
;;; the GNU distribution.
;;;
;;; Code:
(define* (mount-essential-file-systems #:key (root "/"))
"Mount /proc and /sys under ROOT."
(define (scope dir)
(string-append root
(if (string-suffix? "/" root)
""
"/")
dir))
(unless (file-exists? (scope "proc"))
(mkdir (scope "proc")))
(mount "none" (scope "proc") "proc")
(unless (file-exists? (scope "sys"))
(mkdir (scope "sys")))
(mount "none" (scope "sys") "sysfs"))
(define (linux-command-line)
"Return the Linux kernel command line as a list of strings."
(string-tokenize
(call-with-input-file "/proc/cmdline"
get-string-all)))
(define* (make-essential-device-nodes #:key (root "/"))
"Make essential device nodes under ROOT/dev."
;; The hand-made udev!
(define (scope dir)
(string-append root
(if (string-suffix? "/" root)
""
"/")
dir))
(unless (file-exists? (scope "dev"))
(mkdir (scope "dev")))
;; Make the device nodes for QEMU's hard disk and partitions.
(mknod (scope "dev/vda") 'block-special #o644 (device-number 8 0))
(mknod (scope "dev/vda1") 'block-special #o644 (device-number 8 1))
(mknod (scope "dev/vda2") 'block-special #o644 (device-number 8 2))
;; TTYs.
(mknod (scope "dev/tty") 'char-special #o600
(device-number 5 0))
(let loop ((n 0))
(and (< n 50)
(let ((name (format #f "dev/tty~a" n)))
(mknod (scope name) 'char-special #o600
(device-number 4 n))
(loop (+ 1 n)))))
;; Other useful nodes.
(mknod (scope "dev/null") 'char-special #o666 (device-number 1 3))
(mknod (scope "dev/zero") 'char-special #o666 (device-number 1 5)))
(define %host-qemu-ipv4-address
(inet-pton AF_INET "10.0.2.10"))
(define* (configure-qemu-networking #:optional (interface "eth0"))
"Setup the INTERFACE network interface and /etc/resolv.conf according to
QEMU's default networking settings (see net/slirp.c in QEMU for default
networking values.) Return #t if INTERFACE is up, #f otherwise."
(display "configuring QEMU networking...\n")
(let* ((sock (socket AF_INET SOCK_STREAM 0))
(address (make-socket-address AF_INET %host-qemu-ipv4-address 0))
(flags (network-interface-flags sock interface)))
(set-network-interface-address sock interface address)
(set-network-interface-flags sock interface (logior flags IFF_UP))
(unless (file-exists? "/etc")
(mkdir "/etc"))
(call-with-output-file "/etc/resolv.conf"
(lambda (p)
(display "nameserver 10.0.2.3\n" p)))
(logand (network-interface-flags sock interface) IFF_UP)))
(define (mount-qemu-smb-share share mount-point)
"Mount QEMU's CIFS/SMB SHARE at MOUNT-POINT.
Vanilla QEMU's `-smb' option just exports a /qemu share, whereas our
`qemu-with-multiple-smb-shares' package exports the /xchg and /store shares
(the latter allows the store to be shared between the host and guest.)"
(format #t "mounting QEMU's SMB share `~a'...\n" share)
(let ((server "10.0.2.4"))
(mount (string-append "//" server share) mount-point "cifs" 0
(string->pointer "guest,sec=none"))))
(define (bind-mount source target)
"Bind-mount SOURCE at TARGET."
(define MS_BIND 4096) ; from libc's <sys/mount.h>
(mount source target "" MS_BIND))
(define (load-linux-module* file)
"Load Linux module from FILE, the name of a `.ko' file."
(define (slurp module)
(call-with-input-file file get-bytevector-all))
(load-linux-module (slurp file)))
(define (device-number major minor)
"Return the device number for the device with MAJOR and MINOR, for use as
the last argument of `mknod'."
(+ (* major 256) minor))
;;; linux-initrd.scm ends here
|
