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Bug#978636: move to merged-usr-only?

On Dec 29, Ansgar <ansgar@debian.org> wrote:

> as suggested in [1], I would like to see Debian to move to support
> only the merged-usr filesystem layout.  This would simplfy things for
> the future and also address the problem with installing files under
> aliased trees that dpkg has to do for both variants to be supported.
As the architect of the Debian merged-usr transition, I agree: removing 
support for unmerged systems would simplify many things.
Thank you Ansgar for bringing this to the CTTE.

> I'm not asking the committee to decide on a concrete technical
> implementation for this.  Obviously we would need to also implement a
> migration path for legacy installations for a move to merged-usr-only
> to be implemented.  This also isn't relevant for Debian 11 (bullseye),
> but I would like to have enough time in the Debian 12 (bookworm)
> cycle.
FWIW: we have had for a long time a reliable migration method, the
usrmerge package.
Except that on a live system it requires a reboot mid-conversion (due to
bind mounts created by systemd): since this is inconvenient and mildly
scary I did not propose wider adoption for buster.
The best workaround would probably be to run it from the initramfs, but
I have not been able to actually make this[1] work: I expect that 
somebody who knows initramfs-tools better than I do can fix it quickly.

[1] https://salsa.debian.org/md/usrmerge/-/tree/initramfs


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