Re: [Astlinux-devel] unionfs and Linux 3.16

[David K. <da...@ke...>]

Okay, so...  occasionally I replace a file in e.g. /usr/sbin while testing
some change I may have made.  When that change is eventually incorporated
into the build tree I am in the habit of going into /oldroot/mnt/asturw/usr
and then rm -rf sbin.

I think you are saying that this is bad? Right?

So instead I should go into /oldroot/mnt/asturw/usr/sbin and rm the file,
and just leave the sbin directory alone?

What are the consequences of erasing the directory?  And if I do erase a
directory will a reboot make things okay again?

Thanks
David

On Thu, Jun 1, 2017 at 9:55 AM, Lonnie Abelbeck <li...@lo...>
wrote:

> Hi Devs,
>
> First, it has been 10 days since we bumped the kernel to 3.16.43, and
> things appear to be running solid at this point, much thanks for all the
> assistance in getting this major task accomplished.
>
> Though I ran across a glitch, with unionfs, basically you no longer can
> remove a *directory* in the path '/oldroot/mnt/asturw/...' as unionfs with
> kernel 3.16 has an issue with that.  Such a deletion now also effects open
> files in the same path, in memory.
>
> Removing a *file* in the '/oldroot/mnt/asturw/...' path appears to be OK,
> which is important, since that is the only way to "undo" an edit of a file
> on '/oldroot/mnt/asturo/...'
>
> I sent an email to Erez Zadok at Stony Brook University as well as the
> unionfs mailing list, where I go into more detail.
>
> [Unionfs] unionfs with Linux 3.16
> http://www.fsl.cs.sunysb.edu/pipermail/unionfs/2017-May/006196.html
>
> I looked over our scripts and we only needed a few changes to implement
> the new rule:
> --
> Rule: Never remove a directory in the path '/oldroot/mnt/asturw/...'
> --
> (Revision: 8361)
>
> The 'show-union' command now only shows files, so as not to encourage
> directory removal, except 'show-union all' shows directories as well.
>
> Any stale directories on ASTURW should not happen for normal users in
> production, but during development it can be handy to edit ASTURO files, so
> if you wanted to remove these stale directories (leaving them be is fine)
> you need to reboot to RUNNIX and mount /dev/sda2 as -t ext2.
>
> Lonnie
>
>
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