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vm: Make the list of partitions to build a parameter.
* gnu/build/vm.scm (<partition>): New record type. (fold2): New procedure. (initialize-partition-table): Remove #:bootable? and 'partition-size' parameters. Add 'partitions' parameter. Invoke 'parted' with '--script'. (initialize-root-partition): Remove. (initialize-partition, root-partition-initializer): New procedures. (initialize-hard-disk): Remove #:system-directory, #:disk-image-size, #:file-system-type, #:file-system-label, #:closures, #:copy-closures?, #:bootable?, and #:register-closures? parameters. Add #:partitions. Rewrite to use 'initialize-partition' for each item of PARTITIONS. * gnu/system/vm.scm (expression->derivation-in-linux-vm): Add (guix records) to #:modules default value. (qemu-image): Adjust accordingly.
This commit is contained in:
Ludovic Courtès
parent
5b9da1f955
commit
72b891e50e
2 changed files with 181 additions and 101 deletions
253
gnu/build/vm.scm
253
gnu/build/vm.scm
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@ -21,13 +21,26 @@ (define-module (gnu build vm)
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#:use-module (guix build store-copy)
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#:use-module (gnu build linux-boot)
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#:use-module (gnu build install)
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#:use-module (guix records)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-26)
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#:export (qemu-command
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load-in-linux-vm
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format-partition
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initialize-root-partition
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partition
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partition?
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partition-device
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partition-size
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partition-file-system
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partition-label
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partition-bootable?
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partition-initializer
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root-partition-initializer
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initialize-partition-table
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initialize-hard-disk))
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@ -110,24 +123,84 @@ (define image-file
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(mkdir output)
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(copy-recursively "xchg" output))))
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(define* (initialize-partition-table device partition-size
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;;;
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;;; Partitions.
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;;;
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(define-record-type* <partition> partition make-partition
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partition?
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(device partition-device (default #f))
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(size partition-size)
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(file-system partition-file-system (default "ext4"))
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(label partition-label (default #f))
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(bootable? partition-bootable? (default #f))
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(initializer partition-initializer (default (const #t))))
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(define (fold2 proc seed1 seed2 lst) ;TODO: factorize
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"Like `fold', but with a single list and two seeds."
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(let loop ((result1 seed1)
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(result2 seed2)
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(lst lst))
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(if (null? lst)
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(values result1 result2)
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(call-with-values
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(lambda () (proc (car lst) result1 result2))
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(lambda (result1 result2)
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(loop result1 result2 (cdr lst)))))))
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(define* (initialize-partition-table device partitions
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#:key
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bootable?
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(label-type "msdos")
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(offset (expt 2 20)))
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"Create on DEVICE a partition table of type LABEL-TYPE, with a single
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partition of PARTITION-SIZE bytes starting at OFFSET bytes. When BOOTABLE? is
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true, set the bootable flag on the partition. Return #t on success."
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(format #t "creating partition table with a ~a B partition...\n"
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partition-size)
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(unless (zero? (apply system* "parted" device "mklabel" label-type
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"mkpart" "primary" "ext2"
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(format #f "~aB" offset)
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(format #f "~aB" partition-size)
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(if bootable?
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'("set" "1" "boot" "on")
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'())))
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(error "failed to create partition table")))
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"Create on DEVICE a partition table of type LABEL-TYPE, containing the given
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PARTITIONS (a list of <partition> objects), starting at OFFSET bytes. On
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success, return PARTITIONS with their 'device' field changed to reflect their
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actual /dev name based on DEVICE."
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(define (partition-options part offset index)
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(cons* "mkpart" "primary" "ext2"
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(format #f "~aB" offset)
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(format #f "~aB" (+ offset (partition-size part)))
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(if (partition-bootable? part)
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`("set" ,(number->string index) "boot" "on")
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'())))
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(define (options partitions offset)
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(let loop ((partitions partitions)
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(offset offset)
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(index 1)
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(result '()))
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(match partitions
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(()
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(concatenate (reverse result)))
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((head tail ...)
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(loop tail
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;; Leave one sector (512B) between partitions to placate
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;; Parted.
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(+ offset 512 (partition-size head))
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(+ 1 index)
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(cons (partition-options head offset index)
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result))))))
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(format #t "creating partition table with ~a partitions...\n"
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(length partitions))
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(unless (zero? (apply system* "parted" "--script"
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device "mklabel" label-type
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(options partitions offset)))
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(error "failed to create partition table"))
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;; Set the 'device' field of each partition.
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(reverse
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(fold2 (lambda (part result index)
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(values (cons (partition
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(inherit part)
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(device (string-append device
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(number->string index))))
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result)
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(+ 1 index)))
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'()
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1
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partitions)))
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(define MS_BIND 4096) ; <sys/mounts.h> again!
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@ -143,40 +216,67 @@ (define* (format-partition partition type
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'())))
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(error "failed to create partition")))
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(define* (initialize-root-partition target-directory
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#:key copy-closures? register-closures?
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closures system-directory)
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"Initialize the root partition mounted at TARGET-DIRECTORY."
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(define target-store
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(string-append target-directory (%store-directory)))
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(define (initialize-partition partition)
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"Format PARTITION, a <partition> object with a non-#f 'device' field, mount
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it, run its initializer, and unmount it."
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(let ((target "/fs"))
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(format-partition (partition-device partition)
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(partition-file-system partition)
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#:label (partition-label partition))
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(mkdir-p target)
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(mount (partition-device partition) target
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(partition-file-system partition))
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(when copy-closures?
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;; Populate the store.
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(populate-store (map (cut string-append "/xchg/" <>) closures)
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target-directory))
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((partition-initializer partition) target)
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;; Populate /dev.
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(make-essential-device-nodes #:root target-directory)
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(umount target)
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partition))
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;; Optionally, register the inputs in the image's store.
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(when register-closures?
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(unless copy-closures?
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;; XXX: 'guix-register' wants to palpate the things it registers, so
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;; bind-mount the store on the target.
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(mkdir-p target-store)
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(mount (%store-directory) target-store "" MS_BIND))
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(define* (root-partition-initializer #:key (closures '())
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copy-closures?
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(register-closures? #t)
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system-directory)
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"Return a procedure to initialize a root partition.
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(display "registering closures...\n")
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(for-each (lambda (closure)
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(register-closure target-directory
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(string-append "/xchg/" closure)))
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closures)
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(unless copy-closures?
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(umount target-store)))
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If REGISTER-CLOSURES? is true, register all of CLOSURES is the partition's
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store. If COPY-CLOSURES? is true, copy all of CLOSURES to the partition.
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SYSTEM-DIRECTORY is the name of the directory of the 'system' derivation."
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(lambda (target)
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(define target-store
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(string-append target (%store-directory)))
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;; Add the non-store directories and files.
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(display "populating...\n")
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(populate-root-file-system system-directory target-directory))
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(when copy-closures?
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;; Populate the store.
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(populate-store (map (cut string-append "/xchg/" <>) closures)
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target))
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;; Populate /dev.
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(make-essential-device-nodes #:root target)
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;; Optionally, register the inputs in the image's store.
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(when register-closures?
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(unless copy-closures?
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;; XXX: 'guix-register' wants to palpate the things it registers, so
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;; bind-mount the store on the target.
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(mkdir-p target-store)
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(mount (%store-directory) target-store "" MS_BIND))
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(display "registering closures...\n")
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(for-each (lambda (closure)
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(register-closure target
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(string-append "/xchg/" closure)))
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closures)
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(unless copy-closures?
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(umount target-store)))
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;; Add the non-store directories and files.
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(display "populating...\n")
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(populate-root-file-system system-directory target)
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;; 'guix-register' resets timestamps and everything, so no need to do it
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;; once more in that case.
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(unless register-closures?
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(reset-timestamps target))))
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(define (register-grub.cfg-root target grub.cfg)
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"On file system TARGET, register GRUB.CFG as a GC root."
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@ -186,56 +286,29 @@ (define (register-grub.cfg-root target grub.cfg)
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(define* (initialize-hard-disk device
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#:key
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system-directory
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grub.cfg
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disk-image-size
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(file-system-type "ext4")
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file-system-label
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(closures '())
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copy-closures?
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(bootable? #t)
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(register-closures? #t))
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"Initialize DEVICE, a disk of DISK-IMAGE-SIZE bytes, with a FILE-SYSTEM-TYPE
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partition with (optionally) FILE-SYSTEM-LABEL as its volume name, and with
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GRUB installed. When BOOTABLE? is true, set the bootable flag on that
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partition.
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(partitions '()))
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"Initialize DEVICE as a disk containing all the <partition> objects listed
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in PARTITIONS, and using GRUB.CFG as its bootloader configuration file.
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If REGISTER-CLOSURES? is true, register all of CLOSURES is the partition's
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store. If COPY-CLOSURES? is true, copy all of CLOSURES to the partition.
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SYSTEM-DIRECTORY is the name of the directory of the 'system' derivation."
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(define target-directory
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"/fs")
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Each partition is initialized by calling its 'initializer' procedure,
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passing it a directory name where it is mounted."
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(let* ((partitions (initialize-partition-table device partitions))
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(root (find partition-bootable? partitions))
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(target "/fs"))
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(unless root
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(error "no bootable partition specified" partitions))
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(define partition
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(string-append device "1"))
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(for-each initialize-partition partitions)
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(initialize-partition-table device
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(- disk-image-size (* 5 (expt 2 20)))
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#:bootable? bootable?)
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(display "mounting root partition...\n")
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(mkdir-p target)
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(mount (partition-device root) target (partition-file-system root))
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(install-grub grub.cfg device target)
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(format-partition partition file-system-type
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#:label file-system-label)
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;; Register GRUB.CFG as a GC root.
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(register-grub.cfg-root target grub.cfg)
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(display "mounting partition...\n")
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(mkdir target-directory)
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(mount partition target-directory file-system-type)
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(initialize-root-partition target-directory
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#:system-directory system-directory
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#:copy-closures? copy-closures?
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#:register-closures? register-closures?
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#:closures closures)
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(install-grub grub.cfg device target-directory)
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;; Register GRUB.CFG as a GC root.
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(register-grub.cfg-root target-directory grub.cfg)
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;; 'guix-register' resets timestamps and everything, so no need to do it
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;; once more in that case.
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(unless register-closures?
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(reset-timestamps target-directory))
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(umount target-directory))
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(umount target)))
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;;; vm.scm ends here
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@ -101,6 +101,7 @@ (define* (expression->derivation-in-linux-vm name exp
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(gnu build linux-modules)
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(gnu build file-systems)
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(guix elf)
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(guix records)
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(guix build utils)
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(guix build syscalls)
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(guix build store-copy)))
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@ -227,18 +228,24 @@ (define* (qemu-image #:key
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(set-path-environment-variable "PATH" '("bin" "sbin") inputs)
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(let ((graphs '#$(match inputs
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(((names . _) ...)
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names))))
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(let* ((graphs '#$(match inputs
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(((names . _) ...)
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names)))
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(initialize (root-partition-initializer
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#:closures graphs
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#:copy-closures? #$copy-inputs?
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#:register-closures? #$register-closures?
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#:system-directory #$os-derivation))
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(partitions (list (partition
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(size #$(- disk-image-size
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(* 10 (expt 2 20))))
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(label #$file-system-label)
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(file-system #$file-system-type)
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(bootable? #t)
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(initializer initialize)))))
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(initialize-hard-disk "/dev/vda"
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#:system-directory #$os-derivation
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#:grub.cfg #$grub-configuration
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#:closures graphs
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#:copy-closures? #$copy-inputs?
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#:register-closures? #$register-closures?
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#:disk-image-size #$disk-image-size
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#:file-system-type #$file-system-type
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#:file-system-label #$file-system-label)
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#:partitions partitions
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#:grub.cfg #$grub-configuration)
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(reboot))))
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#:system system
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#:make-disk-image? #t
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