Merge pull request #19864 from owncloud/fix-objectstore-btrfs-host

skip btrfs hack for objectstore docker container on btrfs host

tests/objectstore/entrypoint.sh

@@ -136,6 +136,8 @@ ceph osd pool set rbd size 1
 if [ ! -e /var/lib/ceph/osd/${CLUSTER}-0/keyring ]; then
   # bootstrap OSD
   mkdir -p /var/lib/ceph/osd/${CLUSTER}-0
+  # skip btrfs HACK if btrfs is already in place
+  if [ "$(stat -f /var/lib/ceph/osd/${CLUSTER}-0 2>/dev/null | grep btrfs | wc -l)" == "0"  ]; then
     # HACK create btrfs loopback device
     echo "creating osd storage image"
     dd if=/dev/zero of=/tmp/osddata bs=1M count=${OSD_SIZE}
@@ -145,6 +147,7 @@ if [ ! -e /var/lib/ceph/osd/${CLUSTER}-0/keyring ]; then
     echo "now mounted:"
     mount
     # end HACK
+  fi
   echo "creating osd"
   ceph osd create
   echo "creating osd filesystem"