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vm: Estimate the disk size by default.
* gnu/build/vm.scm (estimated-partition-size): New procedure. * gnu/system/vm.scm (expression->derivation-in-linux-vm): Change #:disk-image-size default to 'guess. [builder]: When DISK-IMAGE-SIZE is 'guess, use 'estimated-partition-size' and compute and estimate of the image size. (qemu-image): Likewise. * guix/build/store-copy.scm (file-size, closure-size): New procedures. * guix/scripts/system.scm (%default-options): Change 'image-size' to 'guess. * doc/guix.texi (Building the Installation Image): Remove '--image-size' flag from example. (Invoking guix system): Document the image size estimate.
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Ludovic Courtès
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5 changed files with 77 additions and 23 deletions
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@ -7877,9 +7877,8 @@ that.
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The installation image described above was built using the @command{guix
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system} command, specifically:
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@c FIXME: 1G is too much; see <http://bugs.gnu.org/23077>.
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@example
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guix system disk-image --image-size=1G gnu/system/install.scm
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guix system disk-image gnu/system/install.scm
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@end example
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Have a look at @file{gnu/system/install.scm} in the source tree,
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@ -16187,8 +16186,9 @@ size of the image.
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@item vm-image
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@itemx disk-image
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Return a virtual machine or disk image of the operating system declared
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in @var{file} that stands alone. Use the @option{--image-size} option
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to specify the size of the image.
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in @var{file} that stands alone. By default, @command{guix system}
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estimates the size of the image needed to store the system, but you can
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use the @option{--image-size} option to specify a value.
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When using @code{vm-image}, the returned image is in qcow2 format, which
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the QEMU emulator can efficiently use. @xref{Running GuixSD in a VM},
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@ -16251,6 +16251,10 @@ of the given @var{size}. @var{size} may be a number of bytes, or it may
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include a unit as a suffix (@pxref{Block size, size specifications,,
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coreutils, GNU Coreutils}).
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When this option is omitted, @command{guix system} computes an estimate
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of the image size as a function of the size of the system declared in
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@var{file}.
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@item --root=@var{file}
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@itemx -r @var{file}
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Make @var{file} a symlink to the result, and register it as a garbage
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@ -46,6 +46,7 @@ (define-module (gnu build vm)
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partition-flags
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partition-initializer
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estimated-partition-size
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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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@ -150,6 +151,12 @@ (define-record-type* <partition> partition make-partition
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(flags partition-flags (default '()))
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(initializer partition-initializer (default (const #t))))
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(define (estimated-partition-size graphs)
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"Return the estimated size of a partition that can store the store items
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given by GRAPHS, a list of file names produced by #:references-graphs."
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;; Simply add a 20% overhead.
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(round (* 1.2 (closure-size graphs))))
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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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@ -1,5 +1,5 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
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;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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@ -108,8 +108,7 @@ (define* (expression->derivation-in-linux-vm name exp
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(references-graphs #f)
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(memory-size 256)
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(disk-image-format "qcow2")
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(disk-image-size
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(* 100 (expt 2 20))))
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(disk-image-size 'guess))
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"Evaluate EXP in a QEMU virtual machine running LINUX with INITRD (a
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derivation). In the virtual machine, EXP has access to all its inputs from the
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store; it should put its output files in the `/xchg' directory, which is
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@ -118,7 +117,8 @@ (define* (expression->derivation-in-linux-vm name exp
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When MAKE-DISK-IMAGE? is true, then create a QEMU disk image of type
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DISK-IMAGE-FORMAT (e.g., 'qcow2' or 'raw'), of DISK-IMAGE-SIZE bytes and
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return it.
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return it. When DISK-IMAGE-SIZE is 'guess, estimate the image size based
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based on the size of the closure of REFERENCES-GRAPHS.
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When REFERENCES-GRAPHS is true, it must be a list of file name/store path
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pairs, as for `derivation'. The files containing the reference graphs are
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@ -143,14 +143,18 @@ (define builder
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(use-modules (guix build utils)
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(gnu build vm))
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(let ((inputs '#$(list qemu coreutils))
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(let* ((inputs '#$(list qemu coreutils))
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(linux (string-append #$linux "/"
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#$(system-linux-image-file-name)))
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(initrd (string-append #$initrd "/initrd"))
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(loader #$loader)
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(graphs '#$(match references-graphs
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(((graph-files . _) ...) graph-files)
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(_ #f))))
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(_ #f)))
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(size #$(if (eq? 'guess disk-image-size)
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#~(+ (* 70 (expt 2 20)) ;ESP
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(estimated-partition-size graphs))
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disk-image-size)))
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(set-path-environment-variable "PATH" '("bin") inputs)
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@ -160,7 +164,7 @@ (define builder
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#:memory-size #$memory-size
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#:make-disk-image? #$make-disk-image?
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#:disk-image-format #$disk-image-format
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#:disk-image-size #$disk-image-size
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#:disk-image-size size
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#:references-graphs graphs)))))
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(gexp->derivation name builder
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@ -174,7 +178,7 @@ (define* (qemu-image #:key
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(name "qemu-image")
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(system (%current-system))
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(qemu qemu-minimal)
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(disk-image-size (* 100 (expt 2 20)))
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(disk-image-size 'guess)
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(disk-image-format "qcow2")
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(file-system-type "ext4")
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file-system-label
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@ -201,7 +205,8 @@ (define* (qemu-image #:key
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(guix build utils)))
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#~(begin
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(use-modules (gnu build vm)
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(guix build utils))
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(guix build utils)
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(srfi srfi-26))
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(let ((inputs
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'#$(append (list qemu parted e2fsprogs dosfstools)
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@ -227,9 +232,14 @@ (define* (qemu-image #:key
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#:copy-closures? #$copy-inputs?
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#:register-closures? #$register-closures?
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#:system-directory #$os-drv))
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(root-size #$(if (eq? 'guess disk-image-size)
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#~(estimated-partition-size
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(map (cut string-append "/xchg/" <>)
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graphs))
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(- disk-image-size
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(* 50 (expt 2 20)))))
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(partitions (list (partition
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(size #$(- disk-image-size
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(* 50 (expt 2 20))))
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(size root-size)
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(label #$file-system-label)
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(file-system #$file-system-type)
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(flags '(boot))
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@ -1,5 +1,5 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013, 2014, 2017 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -20,7 +20,9 @@ (define-module (guix build store-copy)
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#:use-module (guix build utils)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 ftw)
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#:export (read-reference-graph
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closure-size
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populate-store))
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;;; Commentary:
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@ -46,6 +48,37 @@ (define (read-reference-graph port)
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(loop (read-line port)
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result)))))
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(define (file-size file)
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"Return the size of bytes of FILE, entering it if FILE is a directory."
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(file-system-fold (const #t)
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(lambda (file stat result) ;leaf
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(+ (stat:size stat) result))
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(lambda (directory stat result) ;down
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(+ (stat:size stat) result))
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(lambda (directory stat result) ;up
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result)
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(lambda (file stat result) ;skip
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result)
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(lambda (file stat errno result)
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(format (current-error-port)
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"file-size: ~a: ~a~%" file
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(strerror errno))
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result)
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0
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file
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lstat))
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(define (closure-size reference-graphs)
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"Return an estimate of the size of the closure described by
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REFERENCE-GRAPHS, a list of reference-graph files."
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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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(define items
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(delete-duplicates (append-map graph-from-file reference-graphs)))
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(reduce + 0 (map file-size items)))
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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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@ -854,7 +854,7 @@ (define %default-options
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(build-hook? . #t)
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(max-silent-time . 3600)
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(verbosity . 0)
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(image-size . ,(* 900 (expt 2 20)))
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(image-size . guess)
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(install-bootloader? . #t)))
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