expand-on-first-boot broken with btrfs subvolume

[Stephen Ecker <stephenecker240@gmail.com>]

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I have an initramfs script that moves the root filesystem to btrfs 
subvolume on first boot.  This breaks the expand-last-partition.sh script 
for the oddest reason:

line 4:  *findmnt / -o source -n*

normally this line outputs something like: */dev/name*,
but when on a btrfs subvolume, it outputs: */dev/name[@subvol] *

This leads to the error: "*Boot device equals root device - no partitioning 
found"*
not exactly sure why, as I didn't dissect every line. I found that changing 
the command in line 4 to: *findmnt / -o sources -n* 
fixed the problem... I tried this after I noticed running *findmnt / 
--output-all*, the device name alone was listed under SOURCES, where SOURCE 
had the subvol appended.

I don't really *like* this solution, partly because 1) an ubuntu 
installation I have doesn't even have the *sources* output (though it was 
added 3 years ago, 
see: https://github.com/util-linux/util-linux/blame/master/misc-utils/findmnt.c#L135 
)... but mainly because I don't know exactly what this will look like for 
other device / filesystem types.

maybe we could add a sed expression to trim past the device name?  i.e.  

*findmnt / -o source -n | sed 's, [\[.*]*,,' *

thoughts?

thanks,
   Stephen

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