(resubmitting/forwarding since on first attempt this bug was already
archived and this my comment wouldn't get included therein)
---------- Forwarded message ----------
Date: Sun, 8 Feb 2015 18:19:06 +0100 (CET)
From: Tomas Pospisek
To: 739593@b.d.o
Cc: Christoph Berg
Michael Stapelberg
Bastian Blank
Sam Morris
Martin Pitt
Subject: Re: systemd makes / shared by default
Hello all,
there's more fallout from the change of the default that makes bind mounts
share submounts (as introduced by systemd) instead of the previous default that
kept them private (as given by the linux kernel).
I have a variety of chroot systems that go like this:
sudo mount --rbind /dev $CHROOT/dev
sudo mount -t tmpfs tmpfs $CHROOT/run/shm
# exec some not very much trusted app such as skype
sudo umount -l $CHROOT/run/shm
sudo umount -l $CHROOT/run
sudo umount -l $CHROOT/dev
This worked under wheezy. Under jessie instead it wrecks havoc to the running
system in that /dev/shm gets unmounted in the base (parent) system and so a lot
of stuff stops working (such as my terminal application "konsole", system shut
down/reboot, chromium etc. etc.).
<opinion>
I *think* that if Debian had a Linus type "benevolent dictator" that dictator
would at this moment be on a spree to verbally kill people for breaking the
system's API. I opine that unless the matter of API stability will be taken as
seriously as Linus does there will be no "year of the Linux desktop" ever,
since application writers can't be expected to be running around in circles all
year long fixing "petty" API breaks left and right on every odd Linux
distribution. And user's can't be expected to be rebuilding their systems from
scratch and reinstalling all their (custom, proprietary, weird) software from
new versions every few years just because the base system had an upgrade.
</opinion>
But aside from making my opinion known here, I am unable to offer a remedy
apart from reverting the default, which would break other software, that
depends on the *new* default behavior as set by systemd.
So unless someone has a clever idea, I'm just going to document this in the
Debian wiki.
I think a warning in the release notes would also be appropriate.
*t
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