variable for embulk version

ebulk

@@ -3,6 +3,7 @@
 DOWN_URL='https://softinst104003.host.vifib.net/erp5/'
 ING_URL='https://softinst104003.host.vifib.net/erp5/portal_ingestion_policies/wendelin_embulk'
 
+EBULK_VERSION="0.9.7"
 EBULK_DATA_PATH=~/.ebulk
 EBULK_DATASET_FILE_NAME="/.ebulk_dataset"
 DATASET_REPORT_FILE_NAME="/.dataset-task-report"
@@ -355,7 +356,7 @@ function checkSoftware {
         if ! checkCurl; then
             return 1
         fi
-        curl --create-dirs -o $embulk -L "https://dl.bintray.com/embulk/maven/embulk-0.9.7.jar"
+        curl --create-dirs -o $embulk -L "https://dl.bintray.com/embulk/maven/embulk-$EBULK_VERSION.jar"
         chmod +x $embulk
         if hash $embulk 2>/dev/null; then
 		echo "[INFO] Done. Embulk successfully installed."
@@ -365,7 +366,7 @@ function checkSoftware {
 		echo
 		echo "[INFO] Plase, try manual installation. Run:"
 		echo
-		echo 'curl --create-dirs -o ~/.embulk/bin/embulk -L "https://dl.bintray.com/embulk/maven/embulk-0.9.7.jar"'
+		echo 'curl --create-dirs -o ~/.embulk/bin/embulk -L "https://dl.bintray.com/embulk/maven/embulk-$EBULK_VERSION.jar"'
 		echo "chmod +x ~/.embulk/bin/embulk"
 		echo -e "echo 'export PATH=\"\$HOME/.embulk/bin:\$PATH\"' >> ~/.bashrc"
 		echo "source ~/.bashrc"
@@ -374,9 +375,9 @@ function checkSoftware {
     else
 	version=$($embulk --version 2>&1 | awk -F ' ' '/embulk/ {print $2}')
 	echo "[INFO] Current embulk version: "$version""
-        if [[ "$version" < "0.9.7" ]]; then
-            echo "Your embulk version is too old. Upgrading embulk to version 0.9.7"
-	    $embulk selfupdate 0.9.7
+        if [[ "$version" < "$EBULK_VERSION" ]]; then
+            echo "Your embulk version is too old. Upgrading embulk to version $EBULK_VERSION"
+	    $embulk selfupdate $EBULK_VERSION
         fi
     fi