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-rw-r--r--Makefile.am1
-rw-r--r--gnu/packages/linux-initrd.scm75
-rw-r--r--guix/build/linux-initrd.scm107
3 files changed, 127 insertions, 56 deletions
diff --git a/Makefile.am b/Makefile.am
index ebe0f2559c..1d68e6516a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -61,6 +61,7 @@ MODULES = \
guix/build/cmake-build-system.scm \
guix/build/gnu-build-system.scm \
guix/build/gnu-dist.scm \
+ guix/build/linux-initrd.scm \
guix/build/perl-build-system.scm \
guix/build/python-build-system.scm \
guix/build/utils.scm \
diff --git a/gnu/packages/linux-initrd.scm b/gnu/packages/linux-initrd.scm
index db54699ac1..2ed52e60f0 100644
--- a/gnu/packages/linux-initrd.scm
+++ b/gnu/packages/linux-initrd.scm
@@ -238,26 +238,17 @@ the Linux kernel.")
(define-public qemu-initrd
(expression->initrd
'(begin
- (use-modules (rnrs io ports)
- (srfi srfi-1)
+ (use-modules (srfi srfi-1)
(srfi srfi-26)
(ice-9 match)
- ((system foreign) #:select (string->pointer))
- ((system base compile) #:select (compile-file)))
+ ((system base compile) #:select (compile-file))
+ (guix build linux-initrd))
- (display "Welcome, this is GNU/Guile!\n")
+ (display "Welcome, this is GNU's early boot Guile.\n")
(display "Use '--repl' for an initrd REPL.\n\n")
- (mkdir "/proc")
- (mount "none" "/proc" "proc")
-
- (mkdir "/sys")
- (mount "none" "/sys" "sysfs")
-
- (let* ((command (string-trim-both
- (call-with-input-file "/proc/cmdline"
- get-string-all)))
- (args (string-split command char-set:blank))
+ (mount-essential-file-systems)
+ (let* ((args (linux-command-line))
(option (lambda (opt)
(let ((opt (string-append opt "=")))
(and=> (find (cut string-prefix? opt <>)
@@ -270,34 +261,13 @@ the Linux kernel.")
(when (member "--repl" args)
((@ (system repl repl) start-repl)))
- (let ((slurp (lambda (module)
- (call-with-input-file
- (string-append "/modules/" module)
- get-bytevector-all))))
- (display "loading CIFS and companion modules...\n")
- (for-each (compose load-linux-module slurp)
- (list "md4.ko" "ecb.ko" "cifs.ko")))
+ (display "loading CIFS and companion modules...\n")
+ (for-each (compose load-linux-module*
+ (cut string-append "/modules/" <>))
+ (list "md4.ko" "ecb.ko" "cifs.ko"))
- ;; See net/slirp.c for default QEMU networking values.
- (display "configuring network...\n")
- (let* ((sock (socket AF_INET SOCK_STREAM 0))
- (address (make-socket-address AF_INET
- (inet-pton AF_INET
- "10.0.2.10")
- 0))
- (flags (network-interface-flags sock "eth0")))
- (set-network-interface-address sock "eth0" address)
- (set-network-interface-flags sock "eth0"
- (logior flags IFF_UP))
- (if (logand (network-interface-flags sock "eth0") IFF_UP)
- (display "network interface is up\n")
- (display "network interface is DOWN\n"))
-
- (mkdir "/etc")
- (call-with-output-file "/etc/resolv.conf"
- (lambda (p)
- (display "nameserver 10.0.2.3\n" p)))
- (sleep 1))
+ (unless (configure-qemu-networking)
+ (display "network interface is DOWN\n"))
;; Prepare the real root file system under /root.
(unless (file-exists? "/root")
@@ -305,27 +275,19 @@ the Linux kernel.")
(if root
(mount root "/root" "ext3")
(mount "none" "/root" "tmpfs"))
- (mkdir "/root/proc")
- (mount "none" "/root/proc" "proc")
- (mkdir "/root/sys")
- (mount "none" "/root/sys" "sysfs")
+ (mount-essential-file-systems #:root "/root")
+
(mkdir "/root/xchg")
(mkdir "/root/nix")
(mkdir "/root/nix/store")
(mkdir "/root/dev")
- (let ((makedev (lambda (major minor)
- (+ (* major 256) minor))))
- (mknod "/root/dev/null" 'char-special #o666 (makedev 1 3))
- (mknod "/root/dev/zero" 'char-special #o666 (makedev 1 5)))
+ (mknod "/root/dev/null" 'char-special #o666 (device-number 1 3))
+ (mknod "/root/dev/zero" 'char-special #o666 (device-number 1 5))
;; Mount the host's store and exchange directory.
- (display "mounting QEMU's SMB shares...\n")
- (let ((server "10.0.2.4"))
- (mount (string-append "//" server "/store") "/root/nix/store" "cifs" 0
- (string->pointer "guest,sec=none"))
- (mount (string-append "//" server "/xchg") "/root/xchg" "cifs" 0
- (string->pointer "guest,sec=none")))
+ (mount-qemu-smb-share "/store" "/root/nix/store")
+ (mount-qemu-smb-share "/xchg" "/root/xchg")
(if to-load
(begin
@@ -346,6 +308,7 @@ the Linux kernel.")
(display "entering a warm and cozy REPL\n")
((@ (system repl repl) start-repl))))))
#:name "qemu-initrd"
+ #:modules '((guix build linux-initrd))
#:linux linux-libre
#:linux-modules '("cifs.ko" "md4.ko" "ecb.ko")))
diff --git a/guix/build/linux-initrd.scm b/guix/build/linux-initrd.scm
new file mode 100644
index 0000000000..274eef7ff3
--- /dev/null
+++ b/guix/build/linux-initrd.scm
@@ -0,0 +1,107 @@
+;;; 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
+ configure-qemu-networking
+ mount-qemu-smb-share
+ 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 %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 (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
generated by cgit v1.2.3 (git 2.25.4) at 2024-11-07 23:27:20 +0000