noauto option ignored in /etc/fstab?

[Josef Wolf]

On Fri, Dec 01, 2017 at 09:09:36AM +0100, Xen wrote:
> Josef Wolf schreef op 01-12-2017 8:50:

> >I have the following line in /etc/fstab:
> >  UUID=XXXX-XXXX-XXXX-XXXX /boot ext4 noauto,relatime 0 2
> >The noauto option should prevent the fs to be mounted during boot.
> >Any ideas what causes this FS to be mounted during boot?
> 
> It's most likely that systemd pulls in this target in some way.
> 
> Here are the services that require boot.mount on my system:
> 
>         "unattended-upgrades.service"->"boot.mount" [color="green"];
>         "unattended-upgrades.service"->"boot.mount" [color="black"];
> 
>         "local-fs.target"->"boot.mount" [color="green"];
>         "local-fs.target"->"boot.mount" [color="black"];
> 
> Local-fs.target should derive from fstab.

I can see that there may be many reasons to pull boot.mount.

But boot.mount should pass the -a option to mount, which in turn should
honor the noauto keyword.

> But unattended-upgrades may pull this mount in regardless.

For many years, I have the following two lines  in apt.conf:

  $ grep boot /etc/apt/*
  /etc/apt/apt.conf:DPkg::Pre-Invoke {"/bin/mount -o remount,exec /tmp; /bin/mount /boot";};
  /etc/apt/apt.conf:DPkg::Post-Invoke {"/bin/mount -o remount /tmp; /bin/umount /boot";};
  $ 

This worked great for many years. But it will fail when the noauto keyword is ignored.

-- 
Josef Wolf
jw at raven.inka.de