bug#37293: image-size is meaningless when generating ext4 images

[Jesse Gibbons <jgibbons2357@gmail.com>]

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The manual says in multiple places the --image-size option should set
the size of a generated ext4 disk image.

I start with a minimalist configuration (attached: minimal.scm) and run
build-minimal-os.sh (attached). I start virt-manager and make a new
virtual machine with the generated img as the disk image. virt-manager
says the disk image is 20G. So far so good...

I run "guix pull" and it fails because it runs out of disk space.

I run df -h and see the partition mounted on / has only 494M.
available.

I run cfdisk /dev/sda and see the first partition is 20G.

I have added quite a bit to the minimal os, but have not changed the
behavior. The attached minimal.scm is my most recent version.

Does anyone know of a way to expand the main partition's size?

Thanks,

-- 
-Jesse

[-- Attachment #2: build-minimal-os.sh --]
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[-- Attachment #3: minimal.scm --]
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(use-modules (gnu)
	     (gnu services networking))

(operating-system
 (bootloader
  (bootloader-configuration
  (bootloader grub-bootloader)))
  (host-name "minimal-os")
 (file-systems (cons*
		(file-system
		 (type "ext4")
		 (mount-point "/")
		 (device "/dev/sda1")
		 (needed-for-boot? #t)
		 (create-mount-point? #t))
		%base-file-systems))
 (packages (cons*
	    %base-packages))

 (services
  (cons*
   (service network-manager-service-type)
   (service wpa-supplicant-service-type)
   %base-services))
 (timezone "America/Denver"))