One thought. From a quick test, it looks like I can mount a directory
tmpfs over and over again, building up the list of mounts. So if there's
some other reason the script can't execute in /run/qemu, every time the
postinst runs, we'd mount over it again. So maybe we should additionally
not mount if /run/qemu is already a mount point, based on findmnt?
So I suggest:
Testing if we can execute ("test the fact"), AND checking that /run/qemu
isn't already mounted, to stop us doing it multiple times, and only then
manually adding the mount.
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https://bugs.launchpad.net/bugs/1913421
Title:
Load of pre-upgrade qemu modules needs to avoid noexec
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