Fixed #65: Skip checksum if shasum is unsupported during installation.

bin/install

@@ -1,17 +1,24 @@
 #! /bin/bash
 
 CHECKSUM="checksum"
+
 curl -Lk https://api.github.com/repos/zhongl/HouseMD/downloads | grep -E "[0-9a-f]+\s+[^ \"]+" -o > $CHECKSUM
 
 JAR_NAME=`cat $CHECKSUM | grep -E housemd.+ -o`
 
 curl -Lk https://github.com/downloads/zhongl/HouseMD/$JAR_NAME > $JAR_NAME
 
-shasum -c $CHECKSUM || {
-    rm -rf $JAR_NAME $CHECKSUM ;
-    echo "Download failed, please try again!";
-    exit 1;
-}
+SHASUM=`which shasum || which sha1sum`
+
+if [ -z $SHASUM ]; then
+    echo "Warning, shasum or sha1sum could not find to validate the download jar."
+else
+    $SHASUM -c $CHECKSUM || {
+        rm -rf $JAR_NAME $CHECKSUM ;
+        echo "Download failed, please try again!";
+        exit 1;
+    }
+fi
 
 mv $JAR_NAME housemd.jar
 rm -rf $CHECKSUM