diff options
| -rw-r--r-- | gnu/system/linux-initrd.scm | 192 | ||||
| -rw-r--r-- | gnu/system/vm.scm | 4 | ||||
| -rw-r--r-- | guix/build/linux-initrd.scm | 121 |
3 files changed, 152 insertions, 165 deletions
diff --git a/gnu/system/linux-initrd.scm b/gnu/system/linux-initrd.scm index a28b913c3e..ea9d708dac 100644 --- a/gnu/system/linux-initrd.scm +++ b/gnu/system/linux-initrd.scm @@ -19,6 +19,8 @@ (define-module (gnu system linux-initrd) #:use-module (guix monads) #:use-module (guix utils) + #:use-module ((guix store) + #:select (%store-prefix)) #:use-module (gnu packages cpio) #:use-module (gnu packages compression) #:use-module (gnu packages linux) @@ -181,180 +183,46 @@ list of Guile module names to be embedded in the initrd." #:modules '((guix build utils)) #:inputs inputs))) -(define (qemu-initrd) +(define* (qemu-initrd #:key + guile-modules-in-chroot? + (mounts `((cifs "/store" ,(%store-prefix)) + (cifs "/xchg" "/xchg")))) "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")) +where the store is shared with the host. MOUNTS is a list of file systems to +be mounted atop the root file system, where each item has the form: - ;; Make /dev nodes. - (make-essential-device-nodes) + (FILE-SYSTEM-TYPE SOURCE TARGET) - ;; 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") +When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in +the new root. This is necessary is the file specified as '--load' needs +access to these modules (which is the case if it wants to even just print an +exception and backtrace!)." + (define cifs-modules + ;; Modules needed to mount CIFS file systems. + '("md4.ko" "ecb.ko" "cifs.ko")) - (mkdir-p "/root/xchg") - (mkdir-p "/root/nix/store") + (define linux-modules + ;; Modules added to the initrd and loaded from the initrd. + (if (assoc-ref mounts 'cifs) + cifs-modules + '())) - (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") + (expression->initrd + `(begin + (use-modules (guix build linux-initrd)) - ;; 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)))))) + (boot-system #:mounts ',mounts + #:linux-modules ',linux-modules + #:qemu-guest-networking? #t + #:guile-modules-in-chroot? ',guile-modules-in-chroot?)) #:name "qemu-initrd" #:modules '((guix build utils) (guix build linux-initrd)) #:linux linux-libre - #:linux-modules '("cifs.ko" "md4.ko" "ecb.ko"))) + #:linux-modules linux-modules)) (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)) + (qemu-initrd #:guile-modules-in-chroot? #f)) ;;; linux-initrd.scm ends here diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm index fa93654144..151535303a 100644 --- a/gnu/system/vm.scm +++ b/gnu/system/vm.scm @@ -178,9 +178,9 @@ made available under the /xchg CIFS share." (user-builder (text-file "builder-in-linux-vm" (object->string exp*))) (coreutils -> (car (assoc-ref %final-inputs "coreutils"))) - (initrd (if initrd + (initrd (if initrd ; use the default initrd? (return initrd) - (qemu-initrd))) ; default initrd + (qemu-initrd #:guile-modules-in-chroot? #t))) (inputs (lower-inputs `(("qemu" ,qemu) ("linux" ,linux) ("initrd" ,initrd) diff --git a/guix/build/linux-initrd.scm b/guix/build/linux-initrd.scm index ae18a16e11..039a60acf3 100644 --- a/guix/build/linux-initrd.scm +++ b/guix/build/linux-initrd.scm @@ -19,6 +19,12 @@ (define-module (guix build linux-initrd) #:use-module (rnrs io ports) #:use-module (system foreign) + #:autoload (system repl repl) (start-repl) + #:autoload (system base compile) (compile-file) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-26) + #:use-module (ice-9 match) + #:use-module (guix build utils) #:export (mount-essential-file-systems linux-command-line make-essential-device-nodes @@ -26,7 +32,8 @@ mount-qemu-smb-share bind-mount load-linux-module* - device-number)) + device-number + boot-system)) ;;; Commentary: ;;; @@ -151,4 +158,116 @@ Vanilla QEMU's `-smb' option just exports a /qemu share, whereas our the last argument of `mknod'." (+ (* major 256) minor)) +(define* (boot-system #:key + (linux-modules '()) + qemu-guest-networking? + guile-modules-in-chroot? + (mounts '())) + "This procedure is meant to be called from an initrd. Boot a system by +first loading LINUX-MODULES, then setting up QEMU guest networking if +QEMU-GUEST-NETWORKING? is true, mounting the file systems specified in MOUNTS, +and finally booting into the new root if any. The initrd supports kernel +command-line options '--load', '--root', and '--repl'. + +MOUNTS must be a list of elements of the form: + + (FILE-SYSTEM-TYPE SOURCE TARGET) + +When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in +the new root." + (define (resolve 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))) + + (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) + (start-repl)) + + (display "loading kernel modules...\n") + (for-each (compose load-linux-module* + (cut string-append "/modules/" <>)) + linux-modules) + + (when qemu-guest-networking? + (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") + + (unless (file-exists? "/root/dev") + (mkdir "/root/dev") + (make-essential-device-nodes #:root "/root")) + + ;; Mount the specified file systems. + (for-each (match-lambda + (('cifs source target) + (let ((target (string-append "/root/" target))) + (mkdir-p target) + (mount-qemu-smb-share source target))) + ;; TODO: Add 9p. + ) + mounts) + + (when guile-modules-in-chroot? + ;; 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 + (begin + (format #t "loading '~a'...\n" to-load) + (chroot "/root") + ;; TODO: Remove /lib, /share, and /loader.go. + (catch #t + (lambda () + (primitive-load to-load)) + (lambda args + (format (current-error-port) "'~a' raised an exception: ~s~%" + to-load args) + (start-repl))) + (format (current-error-port) + "boot program '~a' terminated, rebooting~%" + to-load) + (sleep 2) + (reboot)) + (begin + (display "no boot file passed via '--load'\n") + (display "entering a warm and cozy REPL\n") + (start-repl))))) + ;;; linux-initrd.scm ends here |