Fix shellcheck warnings.

sbin/mount.rbd

@@ -2,26 +2,16 @@
 
 function versioninfo
 {
-	VERSION="$Revision$"
-	VERSION="${VERSION%\ \$}"; VERSION="${VERSION#\:}"; VERSION="${VERSION##\ }"
-	VERSION="(CVS revision $VERSION)"
-
-	NAME="$Name$"
-	NAME="${NAME%\ \$}"; NAME="${NAME#\:}"; NAME="${NAME##\ }"; NAME="${NAME##release-}"; NAME="${NAME//-/.}"
-	[[ -n $NAME ]] && NAME="Version $NAME "
-
-	echo ${CMDNAME}
-	echo ${NAME}${VERSION}
-
-	echo -e "\nCopyright (C) 2013 Hacking Networked Solutions"
+    echo "$(basename "${0}") - version 1.0.0"
+	echo -e "\nCopyright (C) 2013-2020 Hacking Networked Solutions"
 	echo "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>."
 	echo "This is free software: you are free to change and redistribute it."
 	echo "There is NO WARRANTY, to the extent permitted by law."
 }
 
 function helpscreen
 {
-	echo "Usage: ${CMDNAME} <src> <dst> -o <opt>"
+	echo "Usage: $(basename "${0}") <src> <dst> -o <opt>"
 	echo "Mounts the Rados Block Device (RBD) specified by <src> at the mount point"
 	echo "specified by <dst> using the mount options specified in <opt>"
 	echo
@@ -36,9 +26,16 @@ function helpscreen
 
 function error_exit
 {
-	echo $1
-	echo
-	exit $2
+    local msg ev
+    msg="ERROR: ${1}"
+    ev="${2}"
+
+    if [[ -z "${ev}" ]] || (( ev < 1 )); then
+        ev=1
+    fi
+
+    echo "${msg}" >&2
+    exit "${ev}"
 }
 
 function wait_for_device
@@ -60,27 +57,28 @@ function wait_for_device
 
 # Validate our inputs.
 [[ $1 == /* ]] && error_exit "RBD specifiers do NOT start with a /"
+# shellcheck disable=SC2206
 rbd_info=(${1//\// })
 [[ ${#rbd_info[@]} != 2 ]] && error_exit "RBD should be specified as pool/device"
 [[ ! -d $2 ]] && error_exit "Mount point [$4] does not exist!"
 
 # If the RBD is not mapped already (we can't unmap in on unmount so it could be)...
-if [[ ! -e /dev/rbd/${rbd_info[0]}/${rbd_info[1]} ]]; then
+if [[ ! -e "/dev/rbd/${rbd_info[0]}/${rbd_info[1]}" ]]; then
 	# Try to map the RBD.
-	rbd map ${rbd_info[1]} --pool ${rbd_info[0]} || \
+	rbd map "${rbd_info[1]}" --pool "${rbd_info[0]}" || \
 		error_exit "Unable to mount RBD device \"${rbd_info[1]}\" from pool \"${rbd_info[0]}\""
 
 	# We need to wait for UDEV to settle.
-	wait_for_device /dev/rbd/${rbd_info[0]}/${rbd_info[1]}
+	wait_for_device "/dev/rbd/${rbd_info[0]}/${rbd_info[1]}"
 fi
 
 # Try to run fsck on the device as the init script won't!
-fsck -M -C -T /dev/rbd/${rbd_info[0]}/${rbd_info[1]} -- -a || \
+fsck -M -C -T "/dev/rbd/${rbd_info[0]}/${rbd_info[1]}" -- -a || \
 	echo "fsck of /dev/rbd/${rbd_info[0]}/${rbd_info[1]} returned with $?!"
 
 # Try to mount the device, if it fails then unmap it and bail.
-if ! mount /dev/rbd/${rbd_info[0]}/${rbd_info[1]} $2 -o $4; then
-	rbd unmap /dev/rbd/${rbd_info[0]}/${rbd_info[1]}
+if ! mount "/dev/rbd/${rbd_info[0]}/${rbd_info[1]}" "$2" -o "$4"; then
+	rbd unmap "/dev/rbd/${rbd_info[0]}/${rbd_info[1]}"
 	error_exit "Mounting device /dev/rbd/${rbd_info[0]}/${rbd_info[1]} at $2 failed!"
 fi