147 lines
5.1 KiB
Scheme
147 lines
5.1 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix build linux-initrd)
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#:use-module (rnrs io ports)
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#:use-module (system foreign)
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#:export (mount-essential-file-systems
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linux-command-line
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make-essential-device-nodes
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configure-qemu-networking
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mount-qemu-smb-share
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bind-mount
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load-linux-module*
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device-number))
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;;; Commentary:
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;;;
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;;; Utility procedures useful in a Linux initial RAM disk (initrd). Note that
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;;; many of these use procedures not yet available in vanilla Guile (`mount',
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;;; `load-linux-module', etc.); these are provided by a Guile patch used in
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;;; the GNU distribution.
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;;;
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;;; Code:
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(define* (mount-essential-file-systems #:key (root "/"))
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"Mount /proc and /sys under ROOT."
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(define (scope dir)
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(string-append root
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(if (string-suffix? "/" root)
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""
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"/")
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dir))
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(unless (file-exists? (scope "proc"))
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(mkdir (scope "proc")))
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(mount "none" (scope "proc") "proc")
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(unless (file-exists? (scope "sys"))
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(mkdir (scope "sys")))
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(mount "none" (scope "sys") "sysfs"))
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(define (linux-command-line)
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"Return the Linux kernel command line as a list of strings."
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(string-tokenize
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(call-with-input-file "/proc/cmdline"
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get-string-all)))
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(define* (make-essential-device-nodes #:key (root "/"))
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"Make essential device nodes under ROOT/dev."
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;; The hand-made udev!
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(define (scope dir)
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(string-append root
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(if (string-suffix? "/" root)
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""
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"/")
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dir))
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(unless (file-exists? (scope "dev"))
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(mkdir (scope "dev")))
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;; Make the device nodes for QEMU's hard disk and partitions.
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(mknod (scope "dev/vda") 'block-special #o644 (device-number 8 0))
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(mknod (scope "dev/vda1") 'block-special #o644 (device-number 8 1))
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(mknod (scope "dev/vda2") 'block-special #o644 (device-number 8 2))
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;; TTYs.
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(let loop ((n 0))
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(and (< n 50)
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(let ((name (format #f "dev/tty~a" n)))
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(mknod (scope name) 'block-special #o644
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(device-number 4 n))
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(loop (+ 1 n)))))
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;; Other useful nodes.
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(mknod (scope "dev/null") 'char-special #o666 (device-number 1 3))
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(mknod (scope "dev/zero") 'char-special #o666 (device-number 1 5)))
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(define %host-qemu-ipv4-address
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(inet-pton AF_INET "10.0.2.10"))
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(define* (configure-qemu-networking #:optional (interface "eth0"))
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"Setup the INTERFACE network interface and /etc/resolv.conf according to
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QEMU's default networking settings (see net/slirp.c in QEMU for default
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networking values.) Return #t if INTERFACE is up, #f otherwise."
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(display "configuring QEMU networking...\n")
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(let* ((sock (socket AF_INET SOCK_STREAM 0))
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(address (make-socket-address AF_INET %host-qemu-ipv4-address 0))
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(flags (network-interface-flags sock interface)))
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(set-network-interface-address sock interface address)
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(set-network-interface-flags sock interface (logior flags IFF_UP))
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(unless (file-exists? "/etc")
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(mkdir "/etc"))
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(call-with-output-file "/etc/resolv.conf"
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(lambda (p)
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(display "nameserver 10.0.2.3\n" p)))
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(logand (network-interface-flags sock interface) IFF_UP)))
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(define (mount-qemu-smb-share share mount-point)
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"Mount QEMU's CIFS/SMB SHARE at MOUNT-POINT.
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Vanilla QEMU's `-smb' option just exports a /qemu share, whereas our
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`qemu-with-multiple-smb-shares' package exports the /xchg and /store shares
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(the latter allows the store to be shared between the host and guest.)"
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(format #t "mounting QEMU's SMB share `~a'...\n" share)
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(let ((server "10.0.2.4"))
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(mount (string-append "//" server share) mount-point "cifs" 0
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(string->pointer "guest,sec=none"))))
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(define (bind-mount source target)
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"Bind-mount SOURCE at TARGET."
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(define MS_BIND 4096) ; from libc's <sys/mount.h>
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(mount source target "" MS_BIND))
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(define (load-linux-module* file)
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"Load Linux module from FILE, the name of a `.ko' file."
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(define (slurp module)
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(call-with-input-file file get-bytevector-all))
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(load-linux-module (slurp file)))
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(define (device-number major minor)
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"Return the device number for the device with MAJOR and MINOR, for use as
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the last argument of `mknod'."
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(+ (* major 256) minor))
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;;; linux-initrd.scm ends here
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