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rss+qu...@armor-mail.com:
> I have some templates stored in a "file" pool where, for example, I
> find the following files:
>
> private.img
> private-cow.img
> root.img
> root-cow.img
>
> I can do this in dom0, no problem:
>
> sudo mount private.img /mnt
>
> But this fails:
>
> sudo mount root.img /mnt
>
> with a very common, uninformative error, ie.
>
> mount: wrong fs type, bad option, etc. etc.
>
> I would dearly love to mount the root.img and modify a file in /etc file
> in a broken VM. Any hints would be welcome.
It doesn't work for the 'root' volume because that contains multiple
partitions. The / filesystem is on the 3rd. You could use kpartx to
mount it, but mounting any VM or template filesystem in dom0 is
insecure! The kernel can not be assumed to be robust against a
potentially malicious filesystem. Better to attach your broken volume
to a e.g. a trusted DisposableVM for recovery:
https://github.com/QubesOS/qubes-issues/issues/4687#issue-396119132
https://github.com/QubesOS/qubes-issues/issues/4687#issuecomment-753492903
Rusty
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