Bug#627774: mdadm: please migrate to /run

[Mario 'BitKoenig' Holbe]

Package: mdadm
Version: 3.1.4-1+8efb9d1
User: rleigh at debian.org
Usertag: run-transition

Hello,

now where /run is established in unstable it would be great if mdadm
could transit /dev/.mdadm as well as /lib/init/rw/.mdadm to /run
(probably also to /run/mdadm instead of /run/.mdadm).

See also http://wiki.debian.org/ReleaseGoals/RunDirectory

And while we are at it:
are the /lib/init/rw/.mdadm sentinels really still necessary, or vice
versa: is it really still necessary for mdadm-raid to generate uevents
on its own?
Below are udevadm monitor excerpts for a plain mdadm --assemble run vs.
a mdadm-raid start run. They differ in one additional (IMHO) redundant
add-event. Apparently, current kernels themselves generate those events,
and the migration from initramfs to real-/ is handled by udev anyways.

# mdadm -A /dev/md6
mdadm: /dev/md6 has been started with 2 drives (out of 3).

KERNEL[1306238708.217953] add      /devices/virtual/bdi/9:6 (bdi)
KERNEL[1306238708.217983] add      /devices/virtual/block/md6 (block)
KERNEL[1306238708.227033] change   /devices/virtual/block/md6 (block)
KERNEL[1306238708.227600] change   /devices/pci0000:00/0000:00:1f.2/host6/target6:0:0/6:0:0:0/block/sda/sda8 (block)
KERNEL[1306238708.392795] change   /devices/pci0000:00/0000:00:1f.2/host7/target7:0:0/7:0:0:0/block/sdb/sdb8 (block)
KERNEL[1306238708.958163] change   /devices/virtual/block/md6 (block)


root at darkside:~# rm /lib/init/rw/.mdadm/md6-uevent
root at darkside:~# /etc/init.d/mdadm-raid start
Assembling MD array md6...done (degraded [2/3]).
Generating udev events for MD arrays...done.

KERNEL[1306238793.266597] add      /devices/virtual/bdi/9:6 (bdi)
KERNEL[1306238793.266629] add      /devices/virtual/block/md6 (block)
KERNEL[1306238793.275753] change   /devices/virtual/block/md6 (block)
KERNEL[1306238793.276417] change   /devices/pci0000:00/0000:00:1f.2/host6/target6:0:0/6:0:0:0/block/sda/sda8 (block)
KERNEL[1306238793.280611] change   /devices/pci0000:00/0000:00:1f.2/host7/target7:0:0/7:0:0:0/block/sdb/sdb8 (block)
KERNEL[1306238793.503494] change   /devices/virtual/block/md6 (block)
KERNEL[1306238793.604394] add      /devices/virtual/block/md6 (block)


regards
   Mario
-- 
But after a while I learned the trick of speaking fast. You don't have
to think any faster; just use twice as many words to say everything.
                                -- Paul Graham
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