vm: Move image creation to (guix build vm); split into several procedures.
* guix/build/vm.scm (read-reference-graph, initialize-partition-table, install-grub, populate-store, evaluate-populate-directive, reset-timestamps, initialize-hard-disk): New procedures. * gnu/system/vm.scm (qemu-image): Change 'builder' to a call to 'initialize-hard-disk'.
This commit is contained in:
Ludovic Courtès
parent
ade5ce7abc
commit
55651ff207
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@ -217,154 +217,21 @@ such as /etc files."
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(expression->derivation-in-linux-vm
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"qemu-image"
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`(let ()
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(use-modules (ice-9 rdelim)
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(srfi srfi-1)
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(guix build utils)
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(guix build linux-initrd))
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(use-modules (guix build vm)
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(guix build utils))
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(let ((parted (string-append (assoc-ref %build-inputs "parted")
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"/sbin/parted"))
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(mkfs (string-append (assoc-ref %build-inputs "e2fsprogs")
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"/sbin/mkfs.ext3"))
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(grub (string-append (assoc-ref %build-inputs "grub")
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"/sbin/grub-install"))
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(umount (string-append (assoc-ref %build-inputs "util-linux")
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"/bin/umount")) ; XXX: add to Guile
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(grub.cfg ,grub-configuration))
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(set-path-environment-variable "PATH" '("bin" "sbin")
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(map cdr %build-inputs))
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(define (read-reference-graph port)
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;; Return a list of store paths from the reference graph at PORT.
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;; The data at PORT is the format produced by #:references-graphs.
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(let loop ((line (read-line port))
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(result '()))
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(cond ((eof-object? line)
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(delete-duplicates result))
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((string-prefix? "/" line)
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(loop (read-line port)
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(cons line result)))
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(else
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(loop (read-line port)
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result)))))
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(define (things-to-copy)
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;; Return the list of store files to copy to the image.
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(define (graph-from-file file)
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(call-with-input-file file
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read-reference-graph))
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,(match inputs-to-copy
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(((graph-files . _) ...)
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`(let* ((graph-files ',(map (cut string-append "/xchg/" <>)
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graph-files))
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(paths (append-map graph-from-file graph-files)))
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(delete-duplicates paths)))
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(#f ''())))
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;; GRUB is full of shell scripts.
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(setenv "PATH"
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(string-append (dirname grub) ":"
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(assoc-ref %build-inputs "coreutils") "/bin:"
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(assoc-ref %build-inputs "findutils") "/bin:"
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(assoc-ref %build-inputs "sed") "/bin:"
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(assoc-ref %build-inputs "grep") "/bin:"
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(assoc-ref %build-inputs "gawk") "/bin"))
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(display "creating partition table...\n")
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(and (zero? (system* parted "/dev/sda" "mklabel" "msdos"
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"mkpart" "primary" "ext2" "1MiB"
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,(format #f "~aB"
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(- disk-image-size
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(* 5 (expt 2 20))))))
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(begin
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(display "creating ext3 partition...\n")
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(and (zero? (system* mkfs "-F" "/dev/sda1"))
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(let ((store (string-append "/fs" ,(%store-prefix))))
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(display "mounting partition...\n")
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(mkdir "/fs")
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(mount "/dev/sda1" "/fs" "ext3")
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(mkdir-p "/fs/boot/grub")
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(symlink grub.cfg "/fs/boot/grub/grub.cfg")
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;; Populate the image's store.
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(mkdir-p store)
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(chmod store #o1775)
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(for-each (lambda (thing)
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(copy-recursively thing
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(string-append "/fs"
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thing)))
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(things-to-copy))
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;; Populate /dev.
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(make-essential-device-nodes #:root "/fs")
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;; Optionally, register the inputs in the image's store.
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(let* ((guix (assoc-ref %build-inputs "guix"))
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(register (and guix
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(string-append guix
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"/sbin/guix-register"))))
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,@(if initialize-store?
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(match inputs-to-copy
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(((graph-files . _) ...)
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(map (lambda (closure)
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`(system* register "--prefix" "/fs"
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,(string-append "/xchg/"
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closure)))
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graph-files)))
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'(#f)))
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;; Evaluate the POPULATE directives.
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,@(let loop ((directives populate)
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(statements '()))
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(match directives
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(()
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(reverse statements))
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((('directory name) rest ...)
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(loop rest
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(cons `(mkdir-p ,(string-append "/fs" name))
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statements)))
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((('directory name uid gid) rest ...)
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(let ((dir (string-append "/fs" name)))
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(loop rest
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(cons* `(chown ,dir ,uid ,gid)
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`(mkdir-p ,dir)
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statements))))
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(((new '-> old) rest ...)
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(loop rest
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(cons `(symlink ,old
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,(string-append "/fs" new))
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statements)))))
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(and=> (assoc-ref %build-inputs "populate")
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(lambda (populate)
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(chdir "/fs")
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(primitive-load populate)
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(chdir "/")))
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(display "clearing file timestamps...\n")
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(for-each (lambda (file)
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(let ((s (lstat file)))
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;; XXX: Guile uses libc's 'utime' function
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;; (not 'futime'), so the timestamp of
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;; symlinks cannot be changed, and there
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;; are symlinks here pointing to
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;; /gnu/store, which is the host,
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;; read-only store.
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(unless (eq? (stat:type s) 'symlink)
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(utime file 0 0 0 0))))
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(find-files "/fs" ".*"))
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(and (zero?
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(system* grub "--no-floppy"
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"--boot-directory" "/fs/boot"
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"/dev/sda"))
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(begin
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(when (file-exists? "/fs/dev/pts")
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;; Unmount devpts so /fs itself can be
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;; unmounted (failing to do that leads to
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;; EBUSY.)
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(system* umount "/fs/dev/pts"))
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(zero? (system* umount "/fs")))
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(reboot))))))))
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(let ((graphs ',(match inputs-to-copy
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(((names . _) ...)
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names))))
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(initialize-hard-disk #:grub.cfg ,grub-configuration
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#:closures-to-copy graphs
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#:disk-image-size ,disk-image-size
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#:initialize-store? ,initialize-store?
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#:directives ',populate)
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(reboot)))
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#:system system
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#:inputs `(("parted" ,parted)
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("grub" ,grub)
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@ -17,9 +17,14 @@
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix build vm)
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#:use-module (ice-9 match)
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#:use-module (guix build utils)
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#:export (load-in-linux-vm))
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#:use-module (guix build linux-initrd)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:export (load-in-linux-vm
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initialize-hard-disk))
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;;; Commentary:
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;;;
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@ -94,4 +99,134 @@ the #:references-graphs parameter of 'derivation'."
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(mkdir output)
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(copy-recursively "xchg" output))))
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(define (read-reference-graph port)
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"Return a list of store paths from the reference graph at PORT.
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The data at PORT is the format produced by #:references-graphs."
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(let loop ((line (read-line port))
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(result '()))
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(cond ((eof-object? line)
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(delete-duplicates result))
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((string-prefix? "/" line)
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(loop (read-line port)
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(cons line result)))
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(else
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(loop (read-line port)
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result)))))
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(define* (initialize-partition-table device
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#:key
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(label-type "msdos")
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partition-size)
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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 MiB. Return #t on success."
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(display "creating partition table...\n")
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(zero? (system* "parted" "/dev/sda" "mklabel" label-type
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"mkpart" "primary" "ext2" "1MiB"
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(format #f "~aB" partition-size))))
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(define* (install-grub grub.cfg device mount-point)
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"Install GRUB with GRUB.CFG on DEVICE, which is assumed to be mounted on
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MOUNT-POINT. Return #t on success."
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(mkdir-p (string-append mount-point "/boot/grub"))
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(symlink grub.cfg (string-append mount-point "/boot/grub/grub.cfg"))
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(zero? (system* "grub-install" "--no-floppy"
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"--boot-directory" (string-append mount-point "/boot")
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device)))
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(define* (populate-store reference-graphs target)
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"Populate the store under directory TARGET with the items specified in
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REFERENCE-GRAPHS, a list of reference-graph files."
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(define store
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(string-append target (%store-directory)))
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(define (things-to-copy)
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;; Return the list of store files to copy to the image.
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(define (graph-from-file file)
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(call-with-input-file file read-reference-graph))
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(delete-duplicates (append-map graph-from-file reference-graphs)))
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(mkdir-p store)
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(chmod store #o1775)
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(for-each (lambda (thing)
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(copy-recursively thing
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(string-append target thing)))
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(things-to-copy)))
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(define (evaluate-populate-directive directive target)
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"Evaluate DIRECTIVE, an sexp describing a file or directory to create under
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directory TARGET."
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(match directive
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(('directory name)
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(mkdir-p (string-append target name)))
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(('directory name uid gid)
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(let ((dir (string-append target name)))
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(mkdir-p dir)
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(chown dir uid gid)))
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((new '-> old)
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(symlink old (string-append target new)))))
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(define (reset-timestamps directory)
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"Reset the timestamps of all the files under DIRECTORY, so that they appear
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as created and modified at the Epoch."
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(display "clearing file timestamps...\n")
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(for-each (lambda (file)
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(let ((s (lstat file)))
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;; XXX: Guile uses libc's 'utime' function (not 'futime'), so
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;; the timestamp of symlinks cannot be changed, and there are
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;; symlinks here pointing to /gnu/store, which is the host,
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;; read-only store.
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(unless (eq? (stat:type s) 'symlink)
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(utime file 0 0 0 0))))
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(find-files directory "")))
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(define* (initialize-hard-disk #:key
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grub.cfg
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disk-image-size
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(mkfs "mkfs.ext3")
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initialize-store?
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(closures-to-copy '())
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(directives '()))
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(unless (initialize-partition-table "/dev/sda"
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#:partition-size
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(- disk-image-size (* 5 (expt 2 20))))
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(error "failed to create partition table"))
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(display "creating ext3 partition...\n")
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(unless (zero? (system* mkfs "-F" "/dev/sda1"))
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(error "failed to create partition"))
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(display "mounting partition...\n")
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(mkdir "/fs")
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(mount "/dev/sda1" "/fs" "ext3")
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(when (pair? closures-to-copy)
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;; Populate the store.
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(populate-store (map (cut string-append "/xchg/" <>)
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closures-to-copy)
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"/fs"))
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;; Populate /dev.
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(make-essential-device-nodes #:root "/fs")
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;; Optionally, register the inputs in the image's store.
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(when initialize-store?
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(for-each (lambda (closure)
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(let ((status (system* "guix-register" "--prefix" "/fs"
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(string-append "/xchg/" closure))))
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(unless (zero? status)
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(error "failed to register store items" closure))))
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closures-to-copy))
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;; Evaluate the POPULATE directives.
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(for-each (cut evaluate-populate-directive <> "/fs")
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directives)
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(unless (install-grub grub.cfg "/dev/sda" "/fs")
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(error "failed to install GRUB"))
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(reset-timestamps "/fs")
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(zero? (system* "umount" "/fs")))
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;;; vm.scm ends here
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