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tests: Create a copy-on-write image instead of copying eagerly.

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* gnu/tests/install.scm (qemu-command/writable-image): Invoke 'qemu-img
-o backing_file' instead of calling 'copy-file'.
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Ludovic Courtès 2016-11-30 00:05:22 +01:00
parent dcd9d1637a
commit 130079ae27
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1 changed files with 9 additions and 2 deletions
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gnu/tests/install.scm
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@ -199,8 +199,15 @@ IMAGE, a disk image. The QEMU VM is has access to MEMORY-SIZE MiB of RAM."
(mlet %store-monad ((system (current-system)))
(return #~(let ((image #$image))
;; First we need a writable copy of the image.
(format #t "copying image '~a'...~%" image)
(copy-file image "disk.img")
(format #t "creating writable image from '~a'...~%" image)
(unless (zero? (system* #+(file-append qemu-minimal
"/bin/qemu-img")
"create" "-f" "qcow2"
"-o"
(string-append "backing_file=" image)
"disk.img"))
(error "failed to create writable QEMU image" image))
(chmod "disk.img" #o644)
`(,(string-append #$qemu-minimal "/bin/"
#$(qemu-command system))