Ceph

https://github.com/ceph/ceph/pull/10569

for portability/compatibility reasons I'd like to request a backport of this commit to hammer as the script will fail with syntax error when using /bin/bash as default SHELL

echo $SHELL
/bin/bash
./stop.sh

outputs:

./stop.sh: line 73: syntax error near unexpected token `<'
./stop.sh: line 73: ` done < <("${CEPH_BIN}"/rbd showmapped | tail -n +2)'

verify that it works with sh:

sh stop.sh
$?
0

the commit that fixes it:
SHA1: 27f2d806f905df1a51b11bd79f1af4c26471407a

thanks!