On Thu, Aug 01, 2024 at 04:33:23PM +0200, Lorenz via Dng wrote:
> Hi,
>
> Il giorno gio 1 ago 2024 alle ore 04:06 Marc Shapiro via Dng
> <dng@???> ha scritto:
> >
> > What, exactly does the usrmerge package do?
>
> it turns /bin, /lib, /lib64 , /sbin into symlinks to their /usr/
> counterparts; it also takes care of
> moving the content of such directories.
> The replacement is not atomic, so I suggest to do the move alone, separated
> from other dpkg operations.
>
> >
> > If /usr is already in root, and not mounted from elsewhere, is the usrmerge package still required?
> unfortunately, yes; usrmerge is not merging usr into root if they are
> separate partitions,
> althought I think the layout with a separate usr will be no longer possible
> after te merge..

"Not possible" is all too strong.

Most system boot via an initrd (which includes its own filesystem) and
in fact, if /etc/fstab of the target filesystem has a entry for /usr,
then that will be mounted. (You'll see that in
/usr/share/initramfs-tools/init which is the early bootup script,
prior to whatever the "init system" is doing).

In other words, you may well have /usr on a separate partition
(whether or not having the usrmerge silly-links) but you must then
make sure to include an /etc/fstab entry for it so it gets mounted
duuring the early, pre-pivot boot stage.

Ralph.

>
> Lorenzo
>
> >
> >
> > From the Devuan announcement on usrmerge:
> >
> > Navigating the merged usr transition
> >
> > Daedalus/stable is the final Devuan release that will function without merged usr.
> > The safest way to migrate from Daedalus/stable to Excalibur/testing is to first ensure there is sufficient disk space to accommodate the merge, and that you have made backups before proceeding.
> > Only then install the usrmerge package before proceeding with the normal dist-upgrade steps.
> > This document will be updated to reflect future changes as needed.
> >
> >
> > Does #2, above mean to make sure there is enough space in / to copy in all of an externally mounted /usr?
> >
> >
> > I am just trying to clarify what is actually going to happen before it is suddenly upon me.
> >
> >
> > Marc
> >
> >
> >
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