qmnt - Added UUID mount labeling option

tools/qmnt

@@ -19,6 +19,7 @@ MOUNT_FOLDER="/run/media/${CURRENT_USER}"
 
 ALLOW_UUID="0"
 ALLOW_LABEL="0"
+LABEL_BY="LABEL"
 
 print_help () {
     cat /dev/stdin << EOF
@@ -31,6 +32,8 @@ Options:
 -p    --permissions       Force mount permissions to current user
 -u    --uuid              Allow UUIDs as the target
 -l    --label             Allow labels as the target
+-d    --dry-run           Does nothing
+-U    --label-uuid        Use UUID instead of drive label for mountpoint name
 -ro   --read-only         Mounts target as read only
 EOF
 
@@ -111,19 +114,21 @@ get_mapped () {
 
     echo "Target \"${TARGET}\" is not unlocked"
 
-    MAPPED_NAME=$(blkid -o value -s UUID "${TARGET}")
-    if ! cryptsetup open "${TARGET}" "${MAPPED_NAME}"; then
-        echo -e "\e[1;31mCould not unlock target \"${TARGET}\"!""\e[0m" 1>&2
-        exit 1
+    if [[ -z $DRY_RUN ]]; then
+        MAPPED_NAME=$(blkid -o value -s UUID "${TARGET}")
+        if ! cryptsetup open "${TARGET}" "${MAPPED_NAME}"; then
+            echo -e "\e[1;31mCould not unlock target \"${TARGET}\"!""\e[0m" 1>&2
+            exit 1
+        fi
+
+        TARGET="/dev/mapper/${MAPPED_NAME}"
+
+        trap "cryptsetup close ${TARGET}" EXIT
+
+        [[ ! -z $(blkid -o value -s "${LABEL_BY}" "${TARGET}") ]] && LABEL=$(blkid -o value -s "${LABEL_BY}" "${TARGET}")
+
+        TYPE=$(blkid -o value -s TYPE "${TARGET}" || true) # Fuck you bash
     fi
-
-    TARGET="/dev/mapper/${MAPPED_NAME}"
-
-    trap "cryptsetup close ${TARGET}" EXIT
-
-    [[ ! -z $(blkid -o value -s LABEL "${TARGET}") ]] && LABEL=$(blkid -o value -s LABEL "${TARGET}")
-
-    TYPE=$(blkid -o value -s TYPE "${TARGET}" || true) # Fuck you bash
 }
 
 if [[ "$#" -eq 0 ]]; then
@@ -144,6 +149,12 @@ for arg in "$@"; do
         "-l" | "--label")
             ALLOW_LABEL="1"
         ;;
+        "-d" | "--dry-run")
+            DRY_RUN="1"
+        ;;
+        "-U" | "--label-uuid")
+            LABEL_BY="UUID"
+        ;;
         "-ro" | "--read-only")
             MOUNT_OPTS+=",ro"
         ;;
@@ -160,7 +171,7 @@ fi
 
 MAPPED_NAME=""
 
-LABEL=$(blkid -o value -s LABEL "${TARGET}")
+LABEL=$(blkid -o value -s "${LABEL_BY}" "${TARGET}")
 [[ -z $LABEL ]] && LABEL=$(basename "${TARGET}")
 
 TYPE=$(blkid -o value -s TYPE "${TARGET}")
@@ -178,28 +189,34 @@ else
     MOUNT_OPTS="${DEFAULT_MOUNT_OPTS["$TYPE"]}""${MOUNT_OPTS}"
 fi
 
-[[ ! -d "${MOUNT_FOLDER}" ]] && mkdir "${MOUNT_FOLDER}"
-[[ ! -d "${MOUNT_FOLDER}/${LABEL}" ]] && mkdir "${MOUNT_FOLDER}/${LABEL}"
+[[ ! -d "${MOUNT_FOLDER}" && -z $DRY_RUN ]] && mkdir "${MOUNT_FOLDER}"
+[[ ! -d "${MOUNT_FOLDER}/${LABEL}" && -z $DRY_RUN ]] && mkdir "${MOUNT_FOLDER}/${LABEL}"
 
-if ! mount -o "${MOUNT_OPTS}" --source "${TARGET}" --target "${MOUNT_FOLDER}/${LABEL}"; then
-    echo -e "\e[1;31mFailed to mount \"${TARGET}\"!""\e[0m" 1>&2
-    exit 1
+
+if [[ -z $DRY_RUN ]]; then
+    if \
+        mountpoint "${MOUNT_FOLDER}/${LABEL}" 2>&1 &>/dev/null || \
+        findmnt -n -o SOURCE "${TARGET}" 2>&1 &>/dev/null || \
+        ! mount -o "${MOUNT_OPTS}" --source "${TARGET}" --target "${MOUNT_FOLDER}/${LABEL}"; then
+            echo -e "\e[1;31mFailed to mount \"${TARGET}\"!""\e[0m" 1>&2
+            exit 1
+    fi
+
+    (
+        set +e
+
+        trap '' SIGHUP SIGTERM
+
+        setsid sh -c '
+            while mountpoint "${1}"; do
+                sleep 1
+            done
+
+            rmdir "${1}"
+
+            [ -b /dev/mapper/"${2}" ] && cryptsetup close /dev/mapper/"${2}"
+        ' -- "${MOUNT_FOLDER}/${LABEL}" "${MAPPED_NAME}" >/dev/null 2>&1 &
+    ) &
 fi
 
-(
-    set +e
-
-    trap '' SIGHUP SIGTERM
-
-    setsid sh -c '
-        while mountpoint "${1}"; do
-            sleep 1
-        done
-
-        rmdir "${1}"
-
-        [ -b /dev/mapper/"${2}" ] && cryptsetup close /dev/mapper/"${2}"
-    ' -- "${MOUNT_FOLDER}/${LABEL}" "${MAPPED_NAME}" >/dev/null 2>&1 &
-) &
-
 echo -e "\e[1;32mDevice \"${TARGET}\" successfully mounted at \"${MOUNT_FOLDER}/${LABEL}\"""\e[0m"