361 lines
14 KiB
Scheme
361 lines
14 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2013, 2014 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 (gnu system linux-initrd)
|
||
#:use-module (guix monads)
|
||
#:use-module (guix utils)
|
||
#:use-module (gnu packages cpio)
|
||
#:use-module (gnu packages compression)
|
||
#:use-module (gnu packages linux)
|
||
#:use-module (gnu packages guile)
|
||
#:use-module ((gnu packages make-bootstrap)
|
||
#:select (%guile-static-stripped))
|
||
#:export (expression->initrd
|
||
qemu-initrd
|
||
gnu-system-initrd))
|
||
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Tools to build initial RAM disks (initrd's) for Linux-Libre, and in
|
||
;;; particular initrd's that run Guile.
|
||
;;;
|
||
;;; Code:
|
||
|
||
|
||
(define* (expression->initrd exp
|
||
#:key
|
||
(guile %guile-static-stripped)
|
||
(cpio cpio)
|
||
(gzip gzip)
|
||
(name "guile-initrd")
|
||
(system (%current-system))
|
||
(modules '())
|
||
(linux #f)
|
||
(linux-modules '()))
|
||
"Return a package that contains a Linux initrd (a gzipped cpio archive)
|
||
containing GUILE and that evaluates EXP upon booting. LINUX-MODULES is a list
|
||
of `.ko' file names to be copied from LINUX into the initrd. MODULES is a
|
||
list of Guile module names to be embedded in the initrd."
|
||
|
||
;; General Linux overview in `Documentation/early-userspace/README' and
|
||
;; `Documentation/filesystems/ramfs-rootfs-initramfs.txt'.
|
||
|
||
(define builder
|
||
`(begin
|
||
(use-modules (guix build utils)
|
||
(ice-9 pretty-print)
|
||
(ice-9 popen)
|
||
(ice-9 match)
|
||
(ice-9 ftw)
|
||
(srfi srfi-26)
|
||
(system base compile)
|
||
(rnrs bytevectors)
|
||
((system foreign) #:select (sizeof)))
|
||
|
||
(let ((guile (assoc-ref %build-inputs "guile"))
|
||
(cpio (string-append (assoc-ref %build-inputs "cpio")
|
||
"/bin/cpio"))
|
||
(gzip (string-append (assoc-ref %build-inputs "gzip")
|
||
"/bin/gzip"))
|
||
(modules (assoc-ref %build-inputs "modules"))
|
||
(gos (assoc-ref %build-inputs "modules/compiled"))
|
||
(scm-dir (string-append "share/guile/" (effective-version)))
|
||
(go-dir (format #f ".cache/guile/ccache/~a-~a-~a-~a"
|
||
(effective-version)
|
||
(if (eq? (native-endianness) (endianness little))
|
||
"LE"
|
||
"BE")
|
||
(sizeof '*)
|
||
(effective-version)))
|
||
(out (assoc-ref %outputs "out")))
|
||
(mkdir out)
|
||
(mkdir "contents")
|
||
(with-directory-excursion "contents"
|
||
(copy-recursively guile ".")
|
||
(call-with-output-file "init"
|
||
(lambda (p)
|
||
(format p "#!/bin/guile -ds~%!#~%" guile)
|
||
(pretty-print ',exp p)))
|
||
(chmod "init" #o555)
|
||
(chmod "bin/guile" #o555)
|
||
|
||
;; Copy Guile modules.
|
||
(chmod scm-dir #o777)
|
||
(copy-recursively modules scm-dir
|
||
#:follow-symlinks? #t)
|
||
(copy-recursively gos (string-append "lib/guile/"
|
||
(effective-version) "/ccache")
|
||
#:follow-symlinks? #t)
|
||
|
||
;; Compile `init'.
|
||
(mkdir-p go-dir)
|
||
(set! %load-path (cons modules %load-path))
|
||
(set! %load-compiled-path (cons gos %load-compiled-path))
|
||
(compile-file "init"
|
||
#:opts %auto-compilation-options
|
||
#:output-file (string-append go-dir "/init.go"))
|
||
|
||
;; Copy Linux modules.
|
||
(let* ((linux (assoc-ref %build-inputs "linux"))
|
||
(module-dir (and linux
|
||
(string-append linux "/lib/modules"))))
|
||
(mkdir "modules")
|
||
,@(map (lambda (module)
|
||
`(match (find-files module-dir ,module)
|
||
((file)
|
||
(format #t "copying '~a'...~%" file)
|
||
(copy-file file (string-append "modules/"
|
||
,module)))
|
||
(()
|
||
(error "module not found" ,module module-dir))
|
||
((_ ...)
|
||
(error "several modules by that name"
|
||
,module module-dir))))
|
||
linux-modules))
|
||
|
||
;; Reset the timestamps of all the files that will make it in the
|
||
;; initrd.
|
||
(for-each (cut utime <> 0 0 0 0)
|
||
(find-files "." ".*"))
|
||
|
||
(system* cpio "--version")
|
||
(let ((pipe (open-pipe* OPEN_WRITE cpio "-o"
|
||
"-O" (string-append out "/initrd")
|
||
"-H" "newc" "--null")))
|
||
(define print0
|
||
(let ((len (string-length "./")))
|
||
(lambda (file)
|
||
(format pipe "~a\0" (string-drop file len)))))
|
||
|
||
;; Note: as per `ramfs-rootfs-initramfs.txt', always add
|
||
;; directory entries before the files that are inside of it: "The
|
||
;; Linux kernel cpio extractor won't create files in a directory
|
||
;; that doesn't exist, so the directory entries must go before
|
||
;; the files that go in those directories."
|
||
(file-system-fold (const #t)
|
||
(lambda (file stat result) ; leaf
|
||
(print0 file))
|
||
(lambda (dir stat result) ; down
|
||
(unless (string=? dir ".")
|
||
(print0 dir)))
|
||
(const #f) ; up
|
||
(const #f) ; skip
|
||
(const #f)
|
||
#f
|
||
".")
|
||
|
||
(and (zero? (close-pipe pipe))
|
||
(with-directory-excursion out
|
||
(and (zero? (system* gzip "--best" "initrd"))
|
||
(rename-file "initrd.gz" "initrd")))))))))
|
||
|
||
(mlet* %store-monad
|
||
((source (imported-modules modules))
|
||
(compiled (compiled-modules modules))
|
||
(inputs (lower-inputs
|
||
`(("guile" ,guile)
|
||
("cpio" ,cpio)
|
||
("gzip" ,gzip)
|
||
("modules" ,source)
|
||
("modules/compiled" ,compiled)
|
||
,@(if linux
|
||
`(("linux" ,linux))
|
||
'())))))
|
||
(derivation-expression name builder
|
||
#:modules '((guix build utils))
|
||
#:inputs inputs)))
|
||
|
||
(define (qemu-initrd)
|
||
"Return a monadic derivation that builds an initrd for use in a QEMU guest
|
||
where the store is shared with the host."
|
||
(expression->initrd
|
||
'(begin
|
||
(use-modules (srfi srfi-1)
|
||
(srfi srfi-26)
|
||
(ice-9 match)
|
||
((system base compile) #:select (compile-file))
|
||
(guix build utils)
|
||
(guix build linux-initrd))
|
||
|
||
(display "Welcome, this is GNU's early boot Guile.\n")
|
||
(display "Use '--repl' for an initrd REPL.\n\n")
|
||
|
||
(mount-essential-file-systems)
|
||
(let* ((args (linux-command-line))
|
||
(option (lambda (opt)
|
||
(let ((opt (string-append opt "=")))
|
||
(and=> (find (cut string-prefix? opt <>)
|
||
args)
|
||
(lambda (arg)
|
||
(substring arg (+ 1 (string-index arg #\=))))))))
|
||
(to-load (option "--load"))
|
||
(root (option "--root")))
|
||
|
||
(when (member "--repl" args)
|
||
((@ (system repl repl) start-repl)))
|
||
|
||
(display "loading CIFS and companion modules...\n")
|
||
(for-each (compose load-linux-module*
|
||
(cut string-append "/modules/" <>))
|
||
(list "md4.ko" "ecb.ko" "cifs.ko"))
|
||
|
||
(unless (configure-qemu-networking)
|
||
(display "network interface is DOWN\n"))
|
||
|
||
;; Make /dev nodes.
|
||
(make-essential-device-nodes)
|
||
|
||
;; Prepare the real root file system under /root.
|
||
(unless (file-exists? "/root")
|
||
(mkdir "/root"))
|
||
(if root
|
||
(mount root "/root" "ext3")
|
||
(mount "none" "/root" "tmpfs"))
|
||
(mount-essential-file-systems #:root "/root")
|
||
|
||
(mkdir-p "/root/xchg")
|
||
(mkdir-p "/root/nix/store")
|
||
|
||
(unless (file-exists? "/root/dev")
|
||
(mkdir "/root/dev")
|
||
(make-essential-device-nodes #:root "/root"))
|
||
|
||
;; Mount the host's store and exchange directory.
|
||
(mount-qemu-smb-share "/store" "/root/nix/store")
|
||
(mount-qemu-smb-share "/xchg" "/root/xchg")
|
||
|
||
;; Copy the directories that contain .scm and .go files so that the
|
||
;; child process in the chroot can load modules (we would bind-mount
|
||
;; them but for some reason that fails with EINVAL -- XXX).
|
||
(mkdir-p "/root/share")
|
||
(mkdir-p "/root/lib")
|
||
(mount "none" "/root/share" "tmpfs")
|
||
(mount "none" "/root/lib" "tmpfs")
|
||
(copy-recursively "/share" "/root/share"
|
||
#:log (%make-void-port "w"))
|
||
(copy-recursively "/lib" "/root/lib"
|
||
#:log (%make-void-port "w"))
|
||
|
||
|
||
(if to-load
|
||
(letrec ((resolve
|
||
(lambda (file)
|
||
;; If FILE is a symlink to an absolute file name,
|
||
;; resolve it as if we were under /root.
|
||
(let ((st (lstat file)))
|
||
(if (eq? 'symlink (stat:type st))
|
||
(let ((target (readlink file)))
|
||
(resolve (string-append "/root" target)))
|
||
file)))))
|
||
(format #t "loading boot file '~a'...\n" to-load)
|
||
(compile-file (resolve (string-append "/root/" to-load))
|
||
#:output-file "/root/loader.go"
|
||
#:opts %auto-compilation-options)
|
||
(match (primitive-fork)
|
||
(0
|
||
(chroot "/root")
|
||
(load-compiled "/loader.go")
|
||
|
||
;; TODO: Remove /lib, /share, and /loader.go.
|
||
)
|
||
(pid
|
||
(format #t "boot file loaded under PID ~a~%" pid)
|
||
(let ((status (waitpid pid)))
|
||
(reboot)))))
|
||
(begin
|
||
(display "no boot file passed via '--load'\n")
|
||
(display "entering a warm and cozy REPL\n")
|
||
((@ (system repl repl) start-repl))))))
|
||
#:name "qemu-initrd"
|
||
#:modules '((guix build utils)
|
||
(guix build linux-initrd))
|
||
#:linux linux-libre
|
||
#:linux-modules '("cifs.ko" "md4.ko" "ecb.ko")))
|
||
|
||
(define (gnu-system-initrd)
|
||
"Initrd for the GNU system itself, with nothing QEMU-specific."
|
||
(expression->initrd
|
||
'(begin
|
||
(use-modules (srfi srfi-1)
|
||
(srfi srfi-26)
|
||
(ice-9 match)
|
||
(guix build utils)
|
||
(guix build linux-initrd))
|
||
|
||
(display "Welcome, this is GNU's early boot Guile.\n")
|
||
(display "Use '--repl' for an initrd REPL.\n\n")
|
||
|
||
(mount-essential-file-systems)
|
||
(let* ((args (linux-command-line))
|
||
(option (lambda (opt)
|
||
(let ((opt (string-append opt "=")))
|
||
(and=> (find (cut string-prefix? opt <>)
|
||
args)
|
||
(lambda (arg)
|
||
(substring arg (+ 1 (string-index arg #\=))))))))
|
||
(to-load (option "--load"))
|
||
(root (option "--root")))
|
||
|
||
(when (member "--repl" args)
|
||
((@ (system repl repl) start-repl)))
|
||
|
||
;; Make /dev nodes.
|
||
(make-essential-device-nodes)
|
||
|
||
;; Prepare the real root file system under /root.
|
||
(mkdir-p "/root")
|
||
(if root
|
||
;; Assume ROOT has a usable /dev tree.
|
||
(mount root "/root" "ext3")
|
||
(begin
|
||
(mount "none" "/root" "tmpfs")
|
||
(make-essential-device-nodes #:root "/root")))
|
||
|
||
(mount-essential-file-systems #:root "/root")
|
||
|
||
(mkdir-p "/root/tmp")
|
||
(mount "none" "/root/tmp" "tmpfs")
|
||
|
||
;; XXX: We don't copy our fellow Guile modules to /root (see
|
||
;; 'qemu-initrd'), so if TO-LOAD tries to load a module (which can
|
||
;; happen if it throws, to display the exception!), then we're
|
||
;; screwed. Hopefully TO-LOAD is a simple expression that just does
|
||
;; '(execlp ...)'.
|
||
|
||
(if to-load
|
||
(begin
|
||
(format #t "loading '~a'...\n" to-load)
|
||
(chroot "/root")
|
||
(primitive-load to-load)
|
||
(format (current-error-port)
|
||
"boot program '~a' terminated, rebooting~%"
|
||
to-load)
|
||
(sleep 2)
|
||
(reboot))
|
||
(begin
|
||
(display "no init file passed via '--load'\n")
|
||
(display "entering a warm and cozy REPL\n")
|
||
((@ (system repl repl) start-repl))))))
|
||
#:name "qemu-system-initrd"
|
||
#:modules '((guix build linux-initrd)
|
||
(guix build utils))
|
||
#:linux linux-libre))
|
||
|
||
;;; linux-initrd.scm ends here
|