Re: Persistent partitions not on the same device

[Frédéric Boiteux <fboiteux@calistel.com>]

Le Thu, 22 Jan 2009 09:31:51 +0100,
Marco Amadori <amadorim@vdavda.com> a écrit :

> On Thursday 22 January 2009, 08:36:18, Frédéric BOITEUX wrote:
> 
> >   Looking in live-initramfs's script/live code, I've found that the
> > device where is found live-rw (global persistent partition) is
> > excluded from home persistent partition's search.
> 
> Then it is a bug, only the partition should be excluded from the
> search (e.g. /dev/sde4, not /dev/sde).
> 

Here is the suspicious code (near line 1171 of live-initramfs's scripts/live), with not understood comment :

                # search for label and files (this could be hugely optimized)
                cowprobe=$(find_cow_device "${root_persistence}")
                if [ -b "${cowprobe}" ]
                then
                        # Blacklist /cow device, to avoid inconsistent setups fo
r overlapping snapshots
                        # makes sense to have both persistence for /cow and /hom
e mounted, maybe also with
                        # snapshots to be sure to really store some e.g key conf
ig files,
                        # but not on the same media
                        blacklistdev="${cowprobe}"
                        PERSISTENCE_IS_ON="1"
                        export PERSISTENCE_IS_ON
                fi
 

So the device containing root persistence's partition is clearly blacklisted, but I don't understand reason given in the comment... Is it for persistence in files hosted on the same partition ? I don't understand.

	Fred.