Fix shellcheck failures in bootstrap.sh and create_block.sh

hack/.shellcheck_failures

@@ -107,8 +107,6 @@
 ./test/images/volume/gluster/run_gluster.sh
 ./test/images/volume/iscsi/create_block.sh
 ./test/images/volume/nfs/run_nfs.sh
-./test/images/volume/rbd/bootstrap.sh
-./test/images/volume/rbd/create_block.sh
 ./third_party/forked/shell2junit/sh2ju.sh
 ./third_party/intemp/intemp.sh
 ./third_party/multiarch/qemu-user-static/register/qemu-binfmt-conf.sh

test/images/volume/rbd/bootstrap.sh

@@ -25,10 +25,10 @@
 
 
 # Create /etc/ceph/ceph.conf
-sh ./ceph.conf.sh `hostname -i`
+sh ./ceph.conf.sh "$(hostname -i)"
 
 # Configure and start ceph-mon
-sh ./mon.sh `hostname -i`
+sh ./mon.sh "$(hostname -i)"
 
 # Configure and start 2x ceph-osd
 mkdir -p /var/lib/ceph/osd/ceph-0 /var/lib/ceph/osd/ceph-1
@@ -51,7 +51,7 @@ ceph fs new cephfs cephfs_metadata cephfs_data
 # It takes a while until the volume created above is mountable,
 # 1 second is usually enough, but try indefinetily.
 sleep 1
-while ! ceph-fuse -m `hostname -i`:6789 /mnt; do
+while ! ceph-fuse -m "$(hostname -i):6789" /mnt; do
     echo "Waiting for cephfs to be up"
     sleep 1
 done

test/images/volume/rbd/create_block.sh

@@ -20,7 +20,7 @@
 # Exit on the first error.
 set -e
 
-MNTDIR=`mktemp -d`
+MNTDIR="$(mktemp -d)"
 
 cleanup()
 {
@@ -28,8 +28,8 @@ cleanup()
     RET=$?
     # Silently remove everything and ignore errors
     set +e
-    /bin/umount $MNTDIR 2>/dev/null
-    /bin/rmdir $MNTDIR 2>/dev/null
+    /bin/umount "$MNTDIR" 2>/dev/null
+    /bin/rmdir "$MNTDIR" 2>/dev/null
     /bin/rm block 2>/dev/null
     exit $RET
 }
@@ -42,9 +42,9 @@ dd if=/dev/zero of=block seek=120 count=1 bs=1M
 mkfs.ext2 block
 
 # Add index.html to it
-mount -o loop block $MNTDIR
-echo "Hello from RBD" > $MNTDIR/index.html
-umount $MNTDIR
+mount -o loop block "$MNTDIR"
+echo "Hello from RBD" > "$MNTDIR/index.html"
+umount "$MNTDIR"
 
 rm block.tar.gz 2>/dev/null || :
 tar cfz block.tar.gz block