[Bug 1432062] Re: multipath-tools-boot: support booting without user_friendly_names on devices with spaces in identifiers

[Mauricio Faria de Oliveira]

Hi @mathieu-tl @smoser

Back to this one. Good news.

Scott, thanks for the pointer to the error/limitation in kpartx. 
With that fixed, I could successfully boot Ubuntu 14.04.3 on QEMU disks (w/ spaces) w/out user_friendly_names.

I'm attaching a debdiff with the patch submitted to dm-devel here.
Is it still on the window for 14.04.4?

	Boot messages:
	<...>
	[   84.995873] Adding 5492672k swap on /dev/mapper/0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20helloworld-part3. <...>
	[   85.004033] EXT4-fs (dm-3): re-mounted. Opts: errors=remount-ro
	<...>

	$ sudo multipath -l
	0QEMU    QEMU HARDDISK   helloworld dm-0 QEMU    ,QEMU HARDDISK   
	size=128G features='0' hwhandler='0' wp=rw
	`-+- policy='round-robin 0' prio=-1 status=active
	  `- 0:0:0:0 sda 8:0  active undef running

	$ mount | grep ' / '
	/dev/mapper/0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20helloworld-part2 on / type ext4 (rw,errors=remount-ro)

	$ cat /proc/swaps
	Filename                                Type            Size    Used    Priority
	/dev/mapper/0QEMU\134x20\134x20\134x20\134x20QEMU\134x20HARDDISK\134x20\134x20\134x20helloworld-part3 partition 5492672 0       -1

	$ ls -l /dev/mapper
	total 0
	brw-rw---- 1 root disk 252,   0 Jan  7 13:50 0QEMU    QEMU HARDDISK   helloworld
	brw-rw---- 1 root disk 252,   1 Jan  7 13:50 0QEMU    QEMU HARDDISK   test
	lrwxrwxrwx 1 root root        7 Jan  7 13:50 0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20helloworld -> ../dm-0
	brw-rw---- 1 root disk 252,   2 Jan  7 13:50 0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20helloworld-part1
	brw-rw---- 1 root disk 252,   3 Jan  7 13:50 0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20helloworld-part2
	brw-rw---- 1 root disk 252,   4 Jan  7 13:50 0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20helloworld-part3
	lrwxrwxrwx 1 root root        7 Jan  7 13:50 0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20test -> ../dm-1
	brw-rw---- 1 root disk 252,   5 Jan  7 13:50 0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20test-part1
	crw------- 1 root root  10, 236 Jan  7 13:50 control

Notice there are 2 devices for each wholedisk (with mangled and
unmangled names); I suspect that's some inconsistency between multipath
call to libdevmapper and udev (multipath not waiting for udev to create
the nodes, and/or creating the nodes by itself / not using udev -- udev
should use the DM NAME, which indeed is mangled). I tried but could not
find the root cause for that, but it's not a regression from this patch
(it existed previously).

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Title:
  multipath-tools-boot: support booting without user_friendly_names on
  devices with spaces in identifiers

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