GNU bug report logs - #47780
[installer] Trying to install to DVD leads to crash

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mathieu Othacehe <othacehe <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#47780: closed ([installer] Trying to install to DVD leads to
 crash)
Date: Thu, 17 Jun 2021 09:19:01 +0000

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Your message dated Thu, 17 Jun 2021 11:18:31 +0200
with message-id <877disc0ig.fsf <at> gnu.org>
and subject line Re: bug#47780: [installer] Trying to install to DVD leads to crash
has caused the debbugs.gnu.org bug report #47780,
regarding [installer] Trying to install to DVD leads to crash
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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47780: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=47780
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Contact help-debbugs <at> gnu.org with problems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: <bug-guix <at> gnu.org>
Subject: [installer] Trying to install to DVD leads to crash
Date: Wed, 14 Apr 2021 21:02:09 +0200

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Hello!

I’ve run an installation with:

  qemu-img create -f qcow2  /tmp/img.qcow2 2G
  qemu-system-x86_64 -enable-kvm -m 2048 \
    -cdrom /gnu/store/…-image.iso -hda /tmp/img.qcow2 \
    -boot d

where the image was obtained by running:

  guix system disk-image -t iso9660 --label=GUIX_x86_64-linux_1.2.1 \
    gnu/system/install.scm

The installer would propose me two target storage devices: hard disk and
CD/DVD.  I mistakenly chose the latter, which led to a crash (screenshot
attached).

Possible improvements are:

  1. gracefully handling this error;
  2. filtering out read-only storage devices from the menu.

Thoughts?

(This is with commit 863bd265e458d2761906770802716555c54e69a4.)

Ludo’.

[installer-crash.png (image/png, inline)]

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From: Mathieu Othacehe <othacehe <at> gnu.org>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 47780-done <at> debbugs.gnu.org
Subject: Re: bug#47780: [installer] Trying to install to DVD leads to crash
Date: Thu, 17 Jun 2021 11:18:31 +0200

Hey,

> Does Parted provide a way to tell whether a storage device is read-only?
> That would be ideal.

Yes it does, but this is not enough for a reliable installation device
detection. In Qemu the installation device is /dev/sr0 that is
reported as read-only by parted.

Using real hardware, and an installation device on an USB drive, the
installation device is /dev/sd* and is not reported as read-only by
parted.

However, I found a better way to detect the installation device, that
relies on reading the root partition UUID from the command line.

I combined the read-only parted method and the UUID based installation
device detection in e12be802e02b3345a753e7ec1287852a7337a0a5. This seems
to work well for all my machines, plus for your VM use case.

Closing this one,

Thanks,

Mathieu

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