gnu: linux-initrd: Factorize boot code.
* guix/build/linux-initrd.scm (boot-system): New procedure. * gnu/system/linux-initrd.scm (qemu-initrd): Add keyword parameters 'guile-modules-in-chroot?' and 'mounts'. Change builder to simply call 'boot-system'. (gnu-system-initrd): Change to a simple call to 'qemu-initrd'. * gnu/system/vm.scm (expression->derivation-in-linux-vm): Call 'qemu-initrd' with #:guile-modules-in-chroot?.
This commit is contained in:
Ludovic Courtès
parent
735c6dd7fa
commit
d425471182
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@ -19,6 +19,8 @@
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(define-module (gnu system linux-initrd)
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#:use-module (guix monads)
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#:use-module (guix utils)
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#:use-module ((guix store)
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#:select (%store-prefix))
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#:use-module (gnu packages cpio)
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#:use-module (gnu packages compression)
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#:use-module (gnu packages linux)
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@ -181,180 +183,46 @@ list of Guile module names to be embedded in the initrd."
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#:modules '((guix build utils))
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#:inputs inputs)))
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(define (qemu-initrd)
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(define* (qemu-initrd #:key
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guile-modules-in-chroot?
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(mounts `((cifs "/store" ,(%store-prefix))
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(cifs "/xchg" "/xchg"))))
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"Return a monadic derivation that builds an initrd for use in a QEMU guest
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where the store is shared with the host."
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where the store is shared with the host. MOUNTS is a list of file systems to
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be mounted atop the root file system, where each item has the form:
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(FILE-SYSTEM-TYPE SOURCE TARGET)
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When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in
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the new root. This is necessary is the file specified as '--load' needs
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access to these modules (which is the case if it wants to even just print an
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exception and backtrace!)."
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(define cifs-modules
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;; Modules needed to mount CIFS file systems.
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'("md4.ko" "ecb.ko" "cifs.ko"))
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(define linux-modules
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;; Modules added to the initrd and loaded from the initrd.
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(if (assoc-ref mounts 'cifs)
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cifs-modules
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'()))
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(expression->initrd
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'(begin
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(use-modules (srfi srfi-1)
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(srfi srfi-26)
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(ice-9 match)
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((system base compile) #:select (compile-file))
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(guix build utils)
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(guix build linux-initrd))
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`(begin
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(use-modules (guix build linux-initrd))
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(display "Welcome, this is GNU's early boot Guile.\n")
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(display "Use '--repl' for an initrd REPL.\n\n")
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(mount-essential-file-systems)
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(let* ((args (linux-command-line))
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(option (lambda (opt)
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(let ((opt (string-append opt "=")))
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(and=> (find (cut string-prefix? opt <>)
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args)
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(lambda (arg)
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(substring arg (+ 1 (string-index arg #\=))))))))
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(to-load (option "--load"))
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(root (option "--root")))
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(when (member "--repl" args)
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((@ (system repl repl) start-repl)))
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(display "loading CIFS and companion modules...\n")
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(for-each (compose load-linux-module*
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(cut string-append "/modules/" <>))
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(list "md4.ko" "ecb.ko" "cifs.ko"))
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(unless (configure-qemu-networking)
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(display "network interface is DOWN\n"))
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;; Make /dev nodes.
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(make-essential-device-nodes)
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;; Prepare the real root file system under /root.
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(unless (file-exists? "/root")
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(mkdir "/root"))
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(if root
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(mount root "/root" "ext3")
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(mount "none" "/root" "tmpfs"))
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(mount-essential-file-systems #:root "/root")
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(mkdir-p "/root/xchg")
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(mkdir-p "/root/nix/store")
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(unless (file-exists? "/root/dev")
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(mkdir "/root/dev")
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(make-essential-device-nodes #:root "/root"))
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;; Mount the host's store and exchange directory.
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(mount-qemu-smb-share "/store" "/root/nix/store")
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(mount-qemu-smb-share "/xchg" "/root/xchg")
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;; Copy the directories that contain .scm and .go files so that the
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;; child process in the chroot can load modules (we would bind-mount
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;; them but for some reason that fails with EINVAL -- XXX).
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(mkdir-p "/root/share")
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(mkdir-p "/root/lib")
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(mount "none" "/root/share" "tmpfs")
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(mount "none" "/root/lib" "tmpfs")
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(copy-recursively "/share" "/root/share"
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#:log (%make-void-port "w"))
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(copy-recursively "/lib" "/root/lib"
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#:log (%make-void-port "w"))
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(if to-load
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(letrec ((resolve
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(lambda (file)
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;; If FILE is a symlink to an absolute file name,
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;; resolve it as if we were under /root.
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(let ((st (lstat file)))
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(if (eq? 'symlink (stat:type st))
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(let ((target (readlink file)))
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(resolve (string-append "/root" target)))
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file)))))
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(format #t "loading boot file '~a'...\n" to-load)
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(compile-file (resolve (string-append "/root/" to-load))
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#:output-file "/root/loader.go"
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#:opts %auto-compilation-options)
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(match (primitive-fork)
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(0
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(chroot "/root")
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(load-compiled "/loader.go")
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;; TODO: Remove /lib, /share, and /loader.go.
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)
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(pid
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(format #t "boot file loaded under PID ~a~%" pid)
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(let ((status (waitpid pid)))
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(reboot)))))
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(begin
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(display "no boot file passed via '--load'\n")
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(display "entering a warm and cozy REPL\n")
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((@ (system repl repl) start-repl))))))
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(boot-system #:mounts ',mounts
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#:linux-modules ',linux-modules
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#:qemu-guest-networking? #t
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#:guile-modules-in-chroot? ',guile-modules-in-chroot?))
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#:name "qemu-initrd"
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#:modules '((guix build utils)
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(guix build linux-initrd))
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#:linux linux-libre
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#:linux-modules '("cifs.ko" "md4.ko" "ecb.ko")))
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#:linux-modules linux-modules))
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(define (gnu-system-initrd)
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"Initrd for the GNU system itself, with nothing QEMU-specific."
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(expression->initrd
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'(begin
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(use-modules (srfi srfi-1)
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(srfi srfi-26)
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(ice-9 match)
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(guix build utils)
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(guix build linux-initrd))
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(display "Welcome, this is GNU's early boot Guile.\n")
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(display "Use '--repl' for an initrd REPL.\n\n")
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(mount-essential-file-systems)
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(let* ((args (linux-command-line))
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(option (lambda (opt)
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(let ((opt (string-append opt "=")))
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(and=> (find (cut string-prefix? opt <>)
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args)
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(lambda (arg)
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(substring arg (+ 1 (string-index arg #\=))))))))
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(to-load (option "--load"))
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(root (option "--root")))
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(when (member "--repl" args)
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((@ (system repl repl) start-repl)))
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;; Make /dev nodes.
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(make-essential-device-nodes)
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;; Prepare the real root file system under /root.
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(mkdir-p "/root")
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(if root
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;; Assume ROOT has a usable /dev tree.
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(mount root "/root" "ext3")
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(begin
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(mount "none" "/root" "tmpfs")
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(make-essential-device-nodes #:root "/root")))
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(mount-essential-file-systems #:root "/root")
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(mkdir-p "/root/tmp")
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(mount "none" "/root/tmp" "tmpfs")
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;; XXX: We don't copy our fellow Guile modules to /root (see
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;; 'qemu-initrd'), so if TO-LOAD tries to load a module (which can
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;; happen if it throws, to display the exception!), then we're
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;; screwed. Hopefully TO-LOAD is a simple expression that just does
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;; '(execlp ...)'.
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(if to-load
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(begin
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(format #t "loading '~a'...\n" to-load)
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(chroot "/root")
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(primitive-load to-load)
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(format (current-error-port)
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"boot program '~a' terminated, rebooting~%"
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to-load)
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(sleep 2)
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(reboot))
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(begin
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(display "no init file passed via '--load'\n")
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(display "entering a warm and cozy REPL\n")
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((@ (system repl repl) start-repl))))))
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#:name "qemu-system-initrd"
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#:modules '((guix build linux-initrd)
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(guix build utils))
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#:linux linux-libre))
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(qemu-initrd #:guile-modules-in-chroot? #f))
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;;; linux-initrd.scm ends here
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@ -178,9 +178,9 @@ made available under the /xchg CIFS share."
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(user-builder (text-file "builder-in-linux-vm"
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(object->string exp*)))
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(coreutils -> (car (assoc-ref %final-inputs "coreutils")))
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(initrd (if initrd
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(initrd (if initrd ; use the default initrd?
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(return initrd)
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(qemu-initrd))) ; default initrd
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(qemu-initrd #:guile-modules-in-chroot? #t)))
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(inputs (lower-inputs `(("qemu" ,qemu)
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("linux" ,linux)
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("initrd" ,initrd)
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@ -19,6 +19,12 @@
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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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#:autoload (system repl repl) (start-repl)
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#:autoload (system base compile) (compile-file)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:use-module (guix build utils)
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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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@ -26,7 +32,8 @@
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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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device-number
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boot-system))
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;;; Commentary:
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;;;
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@ -151,4 +158,116 @@ Vanilla QEMU's `-smb' option just exports a /qemu share, whereas our
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the last argument of `mknod'."
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(+ (* major 256) minor))
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(define* (boot-system #:key
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(linux-modules '())
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qemu-guest-networking?
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guile-modules-in-chroot?
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(mounts '()))
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"This procedure is meant to be called from an initrd. Boot a system by
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first loading LINUX-MODULES, then setting up QEMU guest networking if
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QEMU-GUEST-NETWORKING? is true, mounting the file systems specified in MOUNTS,
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and finally booting into the new root if any. The initrd supports kernel
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command-line options '--load', '--root', and '--repl'.
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MOUNTS must be a list of elements of the form:
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(FILE-SYSTEM-TYPE SOURCE TARGET)
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When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in
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the new root."
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(define (resolve file)
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;; If FILE is a symlink to an absolute file name, resolve it as if we were
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;; under /root.
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(let ((st (lstat file)))
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(if (eq? 'symlink (stat:type st))
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(let ((target (readlink file)))
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(resolve (string-append "/root" target)))
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file)))
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(display "Welcome, this is GNU's early boot Guile.\n")
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(display "Use '--repl' for an initrd REPL.\n\n")
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(mount-essential-file-systems)
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(let* ((args (linux-command-line))
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(option (lambda (opt)
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(let ((opt (string-append opt "=")))
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(and=> (find (cut string-prefix? opt <>)
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args)
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(lambda (arg)
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(substring arg (+ 1 (string-index arg #\=))))))))
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(to-load (option "--load"))
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(root (option "--root")))
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(when (member "--repl" args)
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(start-repl))
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(display "loading kernel modules...\n")
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(for-each (compose load-linux-module*
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(cut string-append "/modules/" <>))
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linux-modules)
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(when qemu-guest-networking?
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(unless (configure-qemu-networking)
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(display "network interface is DOWN\n")))
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;; Make /dev nodes.
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(make-essential-device-nodes)
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;; Prepare the real root file system under /root.
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(unless (file-exists? "/root")
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(mkdir "/root"))
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(if root
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(mount root "/root" "ext3")
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(mount "none" "/root" "tmpfs"))
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(mount-essential-file-systems #:root "/root")
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(unless (file-exists? "/root/dev")
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(mkdir "/root/dev")
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(make-essential-device-nodes #:root "/root"))
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;; Mount the specified file systems.
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(for-each (match-lambda
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(('cifs source target)
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(let ((target (string-append "/root/" target)))
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(mkdir-p target)
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(mount-qemu-smb-share source target)))
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;; TODO: Add 9p.
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)
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mounts)
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(when guile-modules-in-chroot?
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;; Copy the directories that contain .scm and .go files so that the
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;; child process in the chroot can load modules (we would bind-mount
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;; them but for some reason that fails with EINVAL -- XXX).
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(mkdir-p "/root/share")
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(mkdir-p "/root/lib")
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(mount "none" "/root/share" "tmpfs")
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(mount "none" "/root/lib" "tmpfs")
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(copy-recursively "/share" "/root/share"
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#:log (%make-void-port "w"))
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(copy-recursively "/lib" "/root/lib"
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#:log (%make-void-port "w")))
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(if to-load
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(begin
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(format #t "loading '~a'...\n" to-load)
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(chroot "/root")
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;; TODO: Remove /lib, /share, and /loader.go.
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(catch #t
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(lambda ()
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(primitive-load to-load))
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(lambda args
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(format (current-error-port) "'~a' raised an exception: ~s~%"
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to-load args)
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(start-repl)))
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(format (current-error-port)
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"boot program '~a' terminated, rebooting~%"
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to-load)
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(sleep 2)
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(reboot))
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(begin
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(display "no boot file passed via '--load'\n")
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(display "entering a warm and cozy REPL\n")
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(start-repl)))))
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;;; linux-initrd.scm ends here
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