[gentoo-dev] union fs support

[gentoo-dev] union fs support

[Rafael Espíndola]

I am building a small system based on gentoo. The system is installed
in a squashfs and has a ext2 added via unionfs. The ext2 is in hda1
and the squashfs is in hda2.

I was very pleased to find out that very little tweaking was necessary
in the linuxrc and initrd.scripts of genkernel 3.3. In initrd.scripts:

 setup_unionfs(){
-       if [ "${USE_UNIONFS_NORMAL}" -eq '1' -a "${CDROOT}" -eq '1' ]
+       if [ "${USE_UNIONFS_NORMAL}" -eq '1' ]

and in linuxrc:
@@ -544,6 +544,10 @@
        export CDBOOT
        CDBOOT=1
 else
+       if [ "${USE_UNIONFS_NORMAL}" -eq '1' ]
+       then
+               union_insert_dir $UNION /${NEW_ROOT}
+       fi
        mkdir -p ${NEW_ROOT}/tmp/.initrd
 fi

This simple changes make the use of a unionfs more a less independent
of the use of CDBOOT. Is there any interest in them?

The only problem I am having now is during shutdown. init.d/halt.sh
doesn't appears to have any support for unionfs. Is there a
development version that has? I am trying to add support for it and
will report if I succeed.

Thanks,
Rafael

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Re: [gentoo-dev] union fs support

[Mike Frysinger]

On Thursday 28 July 2005 08:32 am, Rafael Espíndola wrote:
> I am building a small system based on gentoo. The system is installed
> in a squashfs and has a ext2 added via unionfs. The ext2 is in hda1
> and the squashfs is in hda2.

this is already added/being added for 2005.1

join #gentoo-releng for more info
-mike

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Re: [gentoo-dev] union fs support

[Chris Gianelloni]

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On Thu, 2005-07-28 at 08:46 -0400, Mike Frysinger wrote:
> On Thursday 28 July 2005 08:32 am, Rafael Espíndola wrote:
> > I am building a small system based on gentoo. The system is installed
> > in a squashfs and has a ext2 added via unionfs. The ext2 is in hda1
> > and the squashfs is in hda2.
> 
> this is already added/being added for 2005.1
> 
> join #gentoo-releng for more info

No.  It isn't.  We've added unionfs support for CD boots, not for normal
installations.

Rafael, please check http://bugs.gentoo.org/show_bug.cgi?id=99682 for
the initial patch we came up with.

As for non-CD unionfs support, I don't have a clue whether we would want
that in genkernel or not.  Currently, we don't advertise the unionfs
support in genkernel because it is still under heavy development and
isn't guaranteed to work.

A good place to discuss this is actually on the gentoo-catalyst mailing
list.

-- 
Chris Gianelloni
Release Engineering - Strategic Lead/QA Manager
Games - Developer
Gentoo Linux

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[gentoo-dev] Re: union fs support

[Rafael Espíndola]

On 7/28/05, Chris Gianelloni <wolf31o2@gentoo.org> wrote:
> No.  It isn't.  We've added unionfs support for CD boots, not for normal
> installations.
> 
> Rafael, please check http://bugs.gentoo.org/show_bug.cgi?id=99682 for
> the initial patch we came up with.
I have just tested it with baselayout-1.11.13. I think that there is a
check missing after
ebegin "Unmounting filesystems"

fuser is killing everyone with
/bin/fuser -k -m -9 /newroot

(or giving a error if /newroot doesn't exist)

> As for non-CD unionfs support, I don't have a clue whether we would want
> that in genkernel or not.  Currently, we don't advertise the unionfs
> support in genkernel because it is still under heavy development and
> isn't guaranteed to work.
> 
> A good place to discuss this is actually on the gentoo-catalyst mailing
> list.
Will join it soon.

Thanks,
Rafael

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[gentoo-dev] Re: union fs support

[Rafael Espíndola]

On 7/28/05, Mike Frysinger <vapier@gentoo.org> wrote:
> this is already added/being added for 2005.1
One problem that I have found: how to unmount /memory when using
initramfs? Since the /dev is not moved umount says that /dev/hda1 is
not mounted...
 
> join #gentoo-releng for more info
I don't have voice...( espindola is my nick)

> -mike
Thanks,
Rafael

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