Re: [gentoo-dev] newsitem: important fstab update

[Gordon Pettey]

On Wed, Oct 26, 2016 at 9:05 PM, Ian Stakenvicius <axs@g.o> wrote:

> On 26/10/16 04:49 AM, Joshua Kinard wrote:
> > On 10/25/2016 13:15, William Hubbs wrote:
> >> On Tue, Oct 25, 2016 at 01:10:06PM -0400, Mike Gilbert wrote:
> >>> On Tue, Oct 25, 2016 at 1:01 PM, William Hubbs <williamh@g.o>
> wrote:
> >>>> If you are not using /dev/disk/by-* paths in fstab, you do not need to
> >>> take any action for this news item.
> >>>>
> >>>> If you are, it is very critical that you update fstab AS SOON AS
> >>> POSSIBLE. Your system will become unbootable in the future if you do
> >>> not  do so.
> >>>
> >>> Err, what is changing that will make systems unbootable?
> >>>
> >>> I am fairly certain systems running systemd will continue to work
> >>> properly with either syntax.
> >>
> >>  They probably will.
> >>
> >>> If this is about the udev-settle issue for OpenRC, I would urge you to
> >>> reconsider that.
> >>
> >>  There isn't anything to reconsider afaik. The problem is that
> >>  /dev/disk/by-* are only created by udev/eudev, but the other syntax
> >>  works regardless of which device manager  you use, so this is the safer
> >>  route.
> >>
> >>  William
> >>
> >
> > I take it us museum relics still using jurassic-era device names like
> > /dev/sd* or /dev/md* aren't affected by this?
>
> That's correct -- the kernel's 'devtmpfs' creates those ones, whereas
> the /dev/disk/by-* symlinks (pretty well all symlinks in /dev i think,
> actually) are generated by udev rules.
>
> Actually, I wonder if the /dev/[vgname]/[lvname] paths would be
> affected by this too -- those are symlinks to the actual nodes in
> /dev/mapper/ after all, and are created by 11-dm-lvm.rules
>

Those are already problematic; udev and/or lvm2 seem to randomly forget to
set those up sometimes. I use /dev/mapped/vg-lv in /etc/fstab because of
that.