[Bug 120375] Re: cannot boot raid1 with only one disk

[Dustin Kirkland]

I have a pair of debdiffs which will be posted in the following two
messages.  One for mdadm, and a second for initramfs-tools.

The mdadm patch supports an optional kernel parameter, which can be any of:
 * bootdegraded
 * bootdegraded=true
 * bootdegraded=yes
 * bootdegrade=1

If a RAID device containing the root filesystem fails to start, the mdadm failure hooks will eventually run.  When they do, the kernel command line will be checked for a valid 'bootdegraded' flag.  If it is set affirmatively, it will run:
 * mdadm --assemble --scan --run
which will attempt to start the array in a degraded mode.

I have also changed the printed error message to direct the user to use
"bootdegraded=true".

----

For the failure hooks to execute before the init scripts bail out, I
have a patch to initramfs-tools.

Here, I split out the mountroot-fail.hooks code to its own independently
callable function, call_failure_hooks().  And the panic() function
conditionally invokes call_failure_hooks().

Furthermore, the local script invokes the call_failure_hooks() function
*before* it gives up on finding the root device.

I have packages available for testing in my PPA.
 * https://launchpad.net/~kirkland/+archive

:-Dustin

-- 
cannot boot raid1 with only one disk
https://bugs.launchpad.net/bugs/120375
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