Hi Fabio,
On 11/27/18 2:33 AM, 'Fabio' via qubes-users wrote:
Thanks for the reply Ivan.
I was able to mount `dom0:/dev/qubes_dom0/vm-...-private vmname` successfully,
however when trying to mount `dom0:/dev/qubes_dom0/vm-...-root vmname`, I still
get the `wrong fs type, bad option, bad superblock...` error.
You're probably mounting the wrong partition or you are trying to mount
the whole disk.
The following steps work for me:
in dom0:
sudo losetup /dev/loop3 /dev/qubes_dom0/vm-fedora-26-medium-bkp-root
then, attach the device to some VM like you did. In that VM run `sudo
dmesg` and you should see a line like
[timestamp_here] xvdi: xvdi1 xvdi2 xvdi3
Note: it could also be xvdj, xvdk, ... if you have other devices
attached to the VM.
There are thus 3 partitions in the device/volume you attached. You can
see what they are with `sudo sfdisk -l /dev/xvdi`:
Device Start End Sectors Size Type
/dev/xvdi1 2048 411647 409600 200M EFI System
/dev/xvdi2 411648 415743 4096 2M BIOS boot
/dev/xvdi3 415744 20971486 20555743 9.8G Linux filesystem
Trying to mount the first two partitions will return a "bad superblock"
error because there isn't any recognised fs on those. Trying to mount
the whole device (/dev/xvdi) will fail for the same reason.
Mount the third partition:
sudo mount /dev/xvdi3 /mnt
And you should be able to fix fstab there:
ll /mnt/etc/fstab
-rw-r--r-- 1 root root 851 May 11 2018 /mnt/etc/fstab
Then, reverse the instructions: sudo unmount /mnt, detach the device in
the tray and remove the loopback device in dom0 (losetup -d /dev/loop3).
Hope this helps...
I can confirm that I get this same error message when trying to mount any
`--root` suffixed volume nested under `/dev/qubes_dom0`.
To confirm, I am running Qubes v4.0.
Any reason why the `--root` volumes in particular aren't mounting? Those are
where `/etc/fstab` would be located, right?
Thanks again for your help!
Fabio
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Monday, November 26, 2018 12:11 PM, Ivan Mitev <[email protected]> wrote:
On 11/26/18 1:46 PM, 'Fabio' via qubes-users wrote:
I made an accidental edit to /etc/fstab which is causing my TemplateVM to
timeout on boot with error Cannot connect to qrexec agent for 60 seconds....
Is there a way to edit a particular VM's etc/fstab without booting it up? Can I
perhaps mount it's root filesystem?
for R4:
https://groups.google.com/forum/#!searchin/qubes-users/losetup|sort:date/qubes-users/rWRNIt0NOc4/VaFHp42rBgAJ
Alternatively the following command will configure a loopback device
automatically:
qvm-start --hdisk dom0:/dev/qubes_dom0/vm-...-root vmname
R3.2 uses files by default instead of LVM volumes, I can't remember
where they were located (/var/lib/qubes/ or something like that) but the
procedure should be more or less the same.
Attempted solutions
1. I've tried adding init=/bin/bash to the kernel opts, starting the
templateVM and then running sudo xl console TEMPLATE_NAME from Dom0 but I did
not reach a command-prompt before fstab was read and executed.
2. I tried mounting the root filesystem for the TemplateVM from Dom0 with:
sudo mount /dev/qubes_dom0/vm-fedora-26-root mnt but got error wrong fs type,
bad option, bad superblock...
It's not recommended to access VMs' files in dom0. Once you set up a
loopback device and the volume pops up in the device tray, attach it to
a trusted VM and fix fstab there.
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