[systemd-devel] auto-unmount via BindsTo= is annoying

[Andrei Borzenkov]

В Sat, 4 Apr 2015 13:44:50 +0300
Andrei Borzenkov <arvidjaar at gmail.com> пишет:

> В Sat, 4 Apr 2015 12:55:34 +0300
> Mantas Mikulėnas <grawity at gmail.com> пишет:
> 
> > On Sat, Apr 4, 2015 at 7:37 AM, Andrei Borzenkov <arvidjaar at gmail.com>
> > wrote:
> > 
> > > В Fri, 3 Apr 2015 21:19:24 +0300
> > > Mantas Mikulėnas <grawity at gmail.com> пишет:
> > >
> > > > Previously udev used to undo mounts when a device *disappeared;* when
> > > > systemd took over the task, it started unmounting things as soon as it
> > > > noticed that the device *doesn't exist right now.* While similar, the new
> > > > behavior can be annoying, since it also triggers if the device never
> > > > existed in the first place. For example:
> > > >
> > > > ~ My fstab has "/dev/mapper/luks-backups → /mnt/backup". I want to mount
> > > > another disk there (which has a different label), but even though `mount
> > > > /dev/sdb1 /mnt/backup` succeeds, the directory remains empty and won't
> > > show
> > > > up in `findmnt`.
> > > >
> > > > After a few retries I check dmesg and notice systemd saying that
> > > > "mnt-backup.mount is bound to an inactive device; stopping". Which means,
> > > > if my fstab says disk X is mounted there, systemd won't let me mount
> > > > anything else but disk X at that location.
> > > >
> > > > ~ I had to boot to emergency mode due to reasons, and attempted to mount
> > > > /boot & /boot/efi in order to fix something. Since my fstab had
> > > > "/dev/disk/by-partlabel/boot → /boot", any attempts to mount anything at
> > > > /boot get immediately undone – emergency mode has no udev, so I get
> > > > "boot.mount is bound to an inactive device; stopping" all over again.
> > > >
> > >
> > > Do these commits help?
> > >
> > > commit 628c89cc68ab96fce2de7ebba5933725d147aecc
> > > Author: Lennart Poettering <lennart at poettering.net>
> > > Date:   Fri Feb 27 21:55:08 2015 +0100
> > >
> > >     core: rework device state logic
> > >
> > > commit 496068a8288084ab3ecf8b179a8403ecff1a6be8
> > > Author: Martin Pitt <martin.pitt at ubuntu.com>
> > > Date:   Fri Mar 13 08:35:59 2015 +0100
> > >
> > >     core: don't change removed devices to state "tentative"
> > >
> > 
> > Nope, this is already on 093c2cfe3b1.
> > 
> > 
> 
> I cannot reproduce it. Could you give more details (/etc/fstab line,
> systemctl status and systemctl show mnt-backup.mount before and after
> manual mount)?

OK, I now see it in emergency mode as well.