Re: /var to mount over is not empty

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On May 16, 2014, at 9:21 AM, Daniel J Walsh <dwalsh@xxxxxxxxxx> wrote:

> 
> On 05/15/2014 11:26 PM, Chris Murphy wrote:
>> On May 15, 2014, at 6:32 PM, Adam Williamson <awilliam@xxxxxxxxxx> wrote:
>> 
>>> On Thu, 2014-05-15 at 18:22 -0600, Chris Murphy wrote:
>>>> This happens on both F20 and Rawhide with separately mounted /var.
>>>> 
>>>> [    2.839950] f20v.localdomain systemd[1]: Mounting /var...
>>>> [    2.840310] f20v.localdomain systemd[1]: var.mount: Directory /var to mount over is not empty, mounting anyway.
>>>> 
>>>> The thing being created in the underlying /var before mounting is:
>>>> /var/lib/dhclient
>>>> 
>>>> However, NetworkManager doesn't start dhclient until after the mount. But NetworkManager itself is started up before the /var mount. So I think maybe it's NetworkManager that's creating the folder. But I don't really know.
>>>> 
>>>> Can anyone thing of a way to find out what creates this empty directory on startup? My crude idea was to set an selinux label on /var to preventing anything from being created there, and then see what explodes. But I'm not quite sure what chcon command to use. Obviously I'd have to do this on /var when nothing is mounted to it.
>>> systemd has something that's kinda like the old sysvinit 'interactive'
>>> step-through mode:
>>> 
>>> systemd.confirm_spawn=true
>>> 
>>> this may help you if you can find a way to also have a console active
>>> while you're stepping through the boot.
>> Boot slows to a crawl and appears to postpone /var mount such that now I have 2 dozen folders created in /var. I was unable to get a debug shell until the moment I was at rescue mode and at that point all of those folders were already created.
>> 
>> 
>> Chris Murphy
> My guess would be systemd-tmpfiles?

This (unrelated) issue caught the interest of Lennart on the systemd list. He suggested xattr +i on /var/lib to prevent dhclient from being created. And that worked.


[   14.653169] rawhide.localdomain fedora-import-state[277]: cp: cannot create directory ‘/./var/lib/dhclient’: Permission denied
[   14.653474] rawhide.localdomain fedora-import-state[277]: cp: preserving times for ‘/./var/lib’: Operation not permitted


 rpm -q --whatprovides /lib/systemd/fedora-import-state
initscripts-9.54-2.fc21.x86_64

So I filed a bug against initscripts.

https://bugzilla.redhat.com/show_bug.cgi?id=1098611



Chris Murphy
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