Overlayfs support added to Lxroot

[parke]

In June, I happened to read the following on the user_namespaces(7) man page.

   Effect of capabilities within a user namespace

       [snip...]

       Holding CAP_SYS_ADMIN  within  the  user  namespace
       that  owns  a process's mount namespace allows that
       process to create bind mounts and mount the follow‐
       ing types of filesystems:

           •  [snip...]
           •  overlayfs (since Linux 5.11)

This was an exciting discovery! My anticipated use case is:

1. Mounting (as root) a read-only squashfs filesystem, for use as a newroot
2. Overlaying (via Lxroot as non-root) a writable filesystem on top of that read-only squashfs newroot.
3. And then being able to efficiently make arbitrary changes to the overlaid newroot.
4. And also being able to efficiently undo all those changes by deleting the upperdir and workdir.

Pursuant to the above goal, today I added initial overlayfs support to Lxroot. If anyone is interested in using Lxroot's new overlayfs support, please contact me and I will start working towards publishing a new release of Lxroot.

For more information about overlayfs, please see the mount(8) man page.

[fyrak1s]

That sounds thrilling...! I am currently clearing my backlog in order to get to this..
Will try to give it a go on GoboLinux :) but no haste, it will take me probably 1-2 months before I am gonna get to this.

Edit: Maybe this would also be useful to create an encrypted directory?