Suggested that any enhancement to support this for wheezy must be
non-disruptive and must not require changes to any strings that would
need to be translated.
The only way I see of supporting that for wheezy is described below:
Concept:
* user can specify two partitions with the same mount point,
provided they are both btrfs
* partman-btrfs will recognise this special case and assume
that RAID1 is desired
* due to the requirement to avoid changing any text strings,
this will happen silently and the user will not be
prompted to choose RAID level or other possible choices
* if filesystems are not btrfs, the normal error will appear
package partman-target
----------------------
check.d/
proper_mountpoints
duplicate_labels
same_mountpoint and same_label errors must be suppressed when
this special case is detected
package partman-btrfs
---------------------
commit.d/
format_btrfs
* must do a pre-screening of all filesystem specs
and identify those that need RAID
* format the normal filesystems first, and the RAID ones in a
second pass
fstab.d/
btrfs
* must do a pre-screening of all filesystem specs
and identify those that need RAID
* output the normal filesystems first
* for the RAID filesystems, must mount by UUID= syntax
(due to bug #612402)
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=612402
* one possible technique is to just check UUID of each
filesystem, and parse the resulting fstab output via uniq
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