[2.5, UI, RBAC] Normal users can unmount the root file system, but not remount it

[Björn Tillenius]

This is with 2.5.1-7489-g2f25a2cc0-0ubuntu1~18.04.1.

If I log in as a user that has the User role on a resource pool, I can't seem to modify the storage for the machines.

After allocating a node (that has / on the first disk and two unused disks), there are no actions available for the unused disks. For the / partition there is Unmount and Remove. Remove doesn't seem to do anything, except giving the illusion of removing the disk (after reloading the page it's there again).

I can however Umnount the filesystem, but now I have a machine with no /, and no possibility of adding a filesystem.

Further more, the "Add special filesystem" functionality is also somewhat
broken. I can click on it, and it doesn't give any errors when adding
a tmpfs, for example. But there's no sign of it on the page, not even
after reloading it. But if I try to add the same filesystem again,
it complains that one already exists.

After releasing the machine, the tmpfs filesystem is there, though. In
fact, somehow there are 4 tmpfs at the same mount point, and I can't
acquired the machine any more, since it complains that there already
is a filesystem at /mytmpfs (which is the mount point for all four)

This is UI only. In the API it works as expected.

[Nick Niehoff (nniehoff)]

This is a duplicate of bug: https://bugs.launchpad.net/maas/+bug/1809470

[Björn Tillenius (bjornt)]

I've change the summary to make it clear that this is about the user is able to turn the machine unusable, and the only way of fixing it is to release and reacquire the machine. So it's not a duplicate of 1809470.

I've also confirmed that the behavior is the same without using RBAC as well.

[Björn Tillenius (bjornt)]

FWIW, a non-admin can't mount any filesystem, it can only unmount them. This is a UI issue only, it works using the API.