Refactor openSUSE support

quickget

@@ -87,10 +87,10 @@ function releases_linuxmint(){
 }
 
 function releases_opensuse(){
-    echo 15_0 \
+    echo 15.0 \
-    15_1 \
+    15.1 \
-    15_2 \
+    15.2 \
-    15_3 \
+    15.3 \
     microos \
     tumbleweed
 }
@@ -575,30 +575,26 @@ function get_linuxmint() {
 }
 
 function get_opensuse() {
-    # For future releases, use dvd1 iso files.
+    local ISO=""
+    local RELEASES=""
     local URL=""
-    local DL_BASE="https://download.opensuse.org/"
-    local VERSION=""
 
-    case ${RELEASE} in
+    RELEASES=$(releases_opensuse)
-        15_0|15_1|15_2|15_3|tumbleweed|microos) VERSION=${RELEASE//_/.};;
+    if [[ "${RELEASES}" != *"${RELEASE}"* ]]; then
-        *)
         echo "ERROR! openSUSE ${RELEASE} is not a supported release."
-            releases_opensuse
+        echo "${RELEASES}"
         exit 1
-            ;;
+    fi
-    esac
 
-    if [ "${VERSION}" == "tumbleweed" ]; then
+    if [ "${RELEASE}" == "tumbleweed" ]; then
         ISO="openSUSE-Tumbleweed-DVD-x86_64-Current.iso"
-        URL="${DL_BASE}/tumbleweed/iso/${ISO}"
+        URL="https://download.opensuse.org/tumbleweed/iso/${ISO}"
-    elif
+    elif [ "${RELEASE}" == "microos" ]; then
-        [ "${VERSION}" == "microos" ]; then
         ISO="openSUSE-MicroOS-DVD-x86_64-Current.iso"
-        URL="${DL_BASE}/tumbleweed/iso/${ISO}"
+        URL="https://download.opensuse.org/tumbleweed/iso/${ISO}"
     else
-        ISO="openSUSE-Leap-${VERSION}-DVD-x86_64.iso"
+        ISO="openSUSE-Leap-${RELEASE}-DVD-x86_64.iso"
-        URL="${DL_BASE}/distribution/leap/${VERSION}/iso/${ISO}"
+        URL="https://download.opensuse.org/distribution/leap/${RELEASE}/iso/${ISO}"
     fi
     make_vm_dir
     web_get "${URL}" "${VM_PATH}"