Thank you for tour answer.
I’m pretty sure that it’s possible since ubuntu 12.04. My guess is that
they
enabled the config you quoted in newer ubuntu kernel. Here is why:
Man page for precise 12.04
Any filesystem can be a branch, But some are not accepted such
like sysfs, procfs and unionfs. If you specify such filesystems
as an aufs branch, aufs will return an error saying it is
unsupported.
Man page for earlier version (10.04)
Any filesystem can be a branch, except aufs, sysfs, procfs and
unionfs. If you specify such filesystems as an aufs branch,
aufs will return an error saying it is unsupported. If you
enable CONFIG_AUFS_ROBR, you can use aufs as a non-writable
branch of another aufs.
However, the simplest use case doesn’t work ...
On 16 Feb 2014, at 09:17, Michael Johnson - MJ <[1][email protected]> wrote:
From [2]http://aufs.sourceforge.net/aufs.html:
Any filesystem can be a branch, except aufs, sysfs, procfs and unionfs. If
you specify such filesystems as an aufs branch, aufs will return an error
saying it is unsupported. If you enable CONFIG_AUFS_ROBR, you can use aufs
as a non-writable branch of another aufs.
My guess is that the documentation with the ubuntu version simply left aufs
out of the docs. Notice that with the right compile options, newer versions
can use aufs as a non-writable branch as you are trying to do.
On Sat, Feb 15, 2014 at 12:22 PM, Robin Monjo <[3][email protected]>
wrote:
Hello,
My goal is to use an AuFS read only branch as another read only branch:
I've got a directory dir0, then I make :
mount -t aufs -o br=dir2=rw:dir0=ro none dir1
This gives me
- dir0
- dir1 #read only dir0
- dir2 #write layer of dir1
I now want to use dir1 this way:
mount -t aufs -o br=dir4=rw:dir1=ro none dir3
To get
- dir0
- dir1 #read only dir0
- dir2 #write layer of dir0
- dir3 #read only dir1 (dir1 + dir2)
- dir4 #write layer of dir3
I'm using ubuntu 12.04 and this should work according to aufs-tools man
page:
Any filesystem can be a branch, But some are not accepted such like
sysfs,
procfs and unionfs. If you specify such filesystems as an aufs
branch,
aufs will return an error saying it is unsupported.
But I got this error:
mount: wrong fs type, bad option, bad superblock on none, missing
codepage
or helper program, or other error (for several filesystems (e.g. nfs,
cifs) you might need a /sbin/mount. helper program) In some cases
useful
info is found in syslog - try dmesg | tail or so
and dmesg gives me
aufs test_add:231:mount[3346]: unsupported filesystem, (aufs)
Am I missing something here ?
Regards,
Robin
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--
Michael Johnson - MJ
References
1. mailto:[email protected]
2. http://aufs.sourceforge.net/aufs.html
3. mailto:[email protected]
4.
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