Hi,
Attached to bug 1371634 i added a script that shows a general issue with kpartx 
being called on files with spaces in them.
Does that seem like a bug that should also be fixed?

it shows itself with:
$ img="/tmp/my.img"; spacename="/dev/my space name";
$ truncate --size=1G "$img"
$ echo "2048," | sfdisk --force "$img" --unit S
$ lodev=$(sudo losetup --find --show "$img")
$ echo $lodev
/dev/loop0
$ sudo ln -sf "$lodev" "$spacename"
$ ls -l $lodev "$spacename"
brw-rw---- 1 root disk 7, 0 Jun  4 09:25 /dev/loop0
lrwxrwxrwx 1 root root   10 Jun  4 09:25 /dev/my space name -> /dev/loop0

$ sudo kpartx -a -v "$spacename"
device-mapper: reload ioctl on my\x20space\x20name1 failed: Invalid argument
create/reload failed on my space name1
add map my space name1 (0:0): 0 2095104 linear /dev/my space name 2048

## then clean up
$ sudo losetup -d "$lodev"
$ sudo rm "$spacename" "$img"

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https://bugs.launchpad.net/bugs/1432062

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

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