diff options
Diffstat (limited to 'gnu/build/vm.scm')
| -rw-r--r-- | gnu/build/vm.scm | 263 |
1 files changed, 168 insertions, 95 deletions
diff --git a/gnu/build/vm.scm b/gnu/build/vm.scm index 15c22a3e55..a095f9de8a 100644 --- a/gnu/build/vm.scm +++ b/gnu/build/vm.scm @@ -21,13 +21,26 @@ #:use-module (guix build store-copy) #:use-module (gnu build linux-boot) #:use-module (gnu build install) + #:use-module (guix records) #:use-module (ice-9 match) #:use-module (ice-9 regex) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-9) #:use-module (srfi srfi-26) #:export (qemu-command load-in-linux-vm format-partition - initialize-root-partition + + partition + partition? + partition-device + partition-size + partition-file-system + partition-label + partition-bootable? + partition-initializer + + root-partition-initializer initialize-partition-table initialize-hard-disk)) @@ -110,24 +123,84 @@ the #:references-graphs parameter of 'derivation'." (mkdir output) (copy-recursively "xchg" output)))) -(define* (initialize-partition-table device partition-size + +;;; +;;; Partitions. +;;; + +(define-record-type* <partition> partition make-partition + partition? + (device partition-device (default #f)) + (size partition-size) + (file-system partition-file-system (default "ext4")) + (label partition-label (default #f)) + (bootable? partition-bootable? (default #f)) + (initializer partition-initializer (default (const #t)))) + +(define (fold2 proc seed1 seed2 lst) ;TODO: factorize + "Like `fold', but with a single list and two seeds." + (let loop ((result1 seed1) + (result2 seed2) + (lst lst)) + (if (null? lst) + (values result1 result2) + (call-with-values + (lambda () (proc (car lst) result1 result2)) + (lambda (result1 result2) + (loop result1 result2 (cdr lst))))))) + +(define* (initialize-partition-table device partitions #:key - bootable? (label-type "msdos") (offset (expt 2 20))) - "Create on DEVICE a partition table of type LABEL-TYPE, with a single -partition of PARTITION-SIZE bytes starting at OFFSET bytes. When BOOTABLE? is -true, set the bootable flag on the partition. Return #t on success." - (format #t "creating partition table with a ~a B partition...\n" - partition-size) - (unless (zero? (apply system* "parted" device "mklabel" label-type - "mkpart" "primary" "ext2" - (format #f "~aB" offset) - (format #f "~aB" partition-size) - (if bootable? - '("set" "1" "boot" "on") - '()))) - (error "failed to create partition table"))) + "Create on DEVICE a partition table of type LABEL-TYPE, containing the given +PARTITIONS (a list of <partition> objects), starting at OFFSET bytes. On +success, return PARTITIONS with their 'device' field changed to reflect their +actual /dev name based on DEVICE." + (define (partition-options part offset index) + (cons* "mkpart" "primary" "ext2" + (format #f "~aB" offset) + (format #f "~aB" (+ offset (partition-size part))) + (if (partition-bootable? part) + `("set" ,(number->string index) "boot" "on") + '()))) + + (define (options partitions offset) + (let loop ((partitions partitions) + (offset offset) + (index 1) + (result '())) + (match partitions + (() + (concatenate (reverse result))) + ((head tail ...) + (loop tail + ;; Leave one sector (512B) between partitions to placate + ;; Parted. + (+ offset 512 (partition-size head)) + (+ 1 index) + (cons (partition-options head offset index) + result)))))) + + (format #t "creating partition table with ~a partitions...\n" + (length partitions)) + (unless (zero? (apply system* "parted" "--script" + device "mklabel" label-type + (options partitions offset))) + (error "failed to create partition table")) + + ;; Set the 'device' field of each partition. + (reverse + (fold2 (lambda (part result index) + (values (cons (partition + (inherit part) + (device (string-append device + (number->string index)))) + result) + (+ 1 index))) + '() + 1 + partitions))) (define MS_BIND 4096) ; <sys/mounts.h> again! @@ -143,40 +216,67 @@ volume name." '()))) (error "failed to create partition"))) -(define* (initialize-root-partition target-directory - #:key copy-closures? register-closures? - closures system-directory) - "Initialize the root partition mounted at TARGET-DIRECTORY." - (define target-store - (string-append target-directory (%store-directory))) - - (when copy-closures? - ;; Populate the store. - (populate-store (map (cut string-append "/xchg/" <>) closures) - target-directory)) - - ;; Populate /dev. - (make-essential-device-nodes #:root target-directory) - - ;; Optionally, register the inputs in the image's store. - (when register-closures? - (unless copy-closures? - ;; XXX: 'guix-register' wants to palpate the things it registers, so - ;; bind-mount the store on the target. - (mkdir-p target-store) - (mount (%store-directory) target-store "" MS_BIND)) - - (display "registering closures...\n") - (for-each (lambda (closure) - (register-closure target-directory - (string-append "/xchg/" closure))) - closures) - (unless copy-closures? - (umount target-store))) - - ;; Add the non-store directories and files. - (display "populating...\n") - (populate-root-file-system system-directory target-directory)) +(define (initialize-partition partition) + "Format PARTITION, a <partition> object with a non-#f 'device' field, mount +it, run its initializer, and unmount it." + (let ((target "/fs")) + (format-partition (partition-device partition) + (partition-file-system partition) + #:label (partition-label partition)) + (mkdir-p target) + (mount (partition-device partition) target + (partition-file-system partition)) + + ((partition-initializer partition) target) + + (umount target) + partition)) + +(define* (root-partition-initializer #:key (closures '()) + copy-closures? + (register-closures? #t) + system-directory) + "Return a procedure to initialize a root partition. + +If REGISTER-CLOSURES? is true, register all of CLOSURES is the partition's +store. If COPY-CLOSURES? is true, copy all of CLOSURES to the partition. +SYSTEM-DIRECTORY is the name of the directory of the 'system' derivation." + (lambda (target) + (define target-store + (string-append target (%store-directory))) + + (when copy-closures? + ;; Populate the store. + (populate-store (map (cut string-append "/xchg/" <>) closures) + target)) + + ;; Populate /dev. + (make-essential-device-nodes #:root target) + + ;; Optionally, register the inputs in the image's store. + (when register-closures? + (unless copy-closures? + ;; XXX: 'guix-register' wants to palpate the things it registers, so + ;; bind-mount the store on the target. + (mkdir-p target-store) + (mount (%store-directory) target-store "" MS_BIND)) + + (display "registering closures...\n") + (for-each (lambda (closure) + (register-closure target + (string-append "/xchg/" closure))) + closures) + (unless copy-closures? + (umount target-store))) + + ;; Add the non-store directories and files. + (display "populating...\n") + (populate-root-file-system system-directory target) + + ;; 'guix-register' resets timestamps and everything, so no need to do it + ;; once more in that case. + (unless register-closures? + (reset-timestamps target)))) (define (register-grub.cfg-root target grub.cfg) "On file system TARGET, register GRUB.CFG as a GC root." @@ -186,56 +286,29 @@ volume name." (define* (initialize-hard-disk device #:key - system-directory grub.cfg - disk-image-size - (file-system-type "ext4") - file-system-label - (closures '()) - copy-closures? - (bootable? #t) - (register-closures? #t)) - "Initialize DEVICE, a disk of DISK-IMAGE-SIZE bytes, with a FILE-SYSTEM-TYPE -partition with (optionally) FILE-SYSTEM-LABEL as its volume name, and with -GRUB installed. When BOOTABLE? is true, set the bootable flag on that -partition. - -If REGISTER-CLOSURES? is true, register all of CLOSURES is the partition's -store. If COPY-CLOSURES? is true, copy all of CLOSURES to the partition. -SYSTEM-DIRECTORY is the name of the directory of the 'system' derivation." - (define target-directory - "/fs") - - (define partition - (string-append device "1")) - - (initialize-partition-table device - (- disk-image-size (* 5 (expt 2 20))) - #:bootable? bootable?) - - (format-partition partition file-system-type - #:label file-system-label) - - (display "mounting partition...\n") - (mkdir target-directory) - (mount partition target-directory file-system-type) + (partitions '())) + "Initialize DEVICE as a disk containing all the <partition> objects listed +in PARTITIONS, and using GRUB.CFG as its bootloader configuration file. - (initialize-root-partition target-directory - #:system-directory system-directory - #:copy-closures? copy-closures? - #:register-closures? register-closures? - #:closures closures) +Each partition is initialized by calling its 'initializer' procedure, +passing it a directory name where it is mounted." + (let* ((partitions (initialize-partition-table device partitions)) + (root (find partition-bootable? partitions)) + (target "/fs")) + (unless root + (error "no bootable partition specified" partitions)) - (install-grub grub.cfg device target-directory) + (for-each initialize-partition partitions) - ;; Register GRUB.CFG as a GC root. - (register-grub.cfg-root target-directory grub.cfg) + (display "mounting root partition...\n") + (mkdir-p target) + (mount (partition-device root) target (partition-file-system root)) + (install-grub grub.cfg device target) - ;; 'guix-register' resets timestamps and everything, so no need to do it - ;; once more in that case. - (unless register-closures? - (reset-timestamps target-directory)) + ;; Register GRUB.CFG as a GC root. + (register-grub.cfg-root target grub.cfg) - (umount target-directory)) + (umount target))) ;;; vm.scm ends here |