Only copy email archiving script if it has changed

src/freedombone-base-email

 
     # ensure that the mail archive script is up to date
     if [ -f /usr/local/bin/${PROJECT_NAME}-archive-mail ]; then
-        cp /usr/local/bin/${PROJECT_NAME}-archive-mail /etc/cron.daily/archivemail
+        if [ ! -f /etc/cron.daily/archivemail ]; then
+            cp /usr/local/bin/${PROJECT_NAME}-archive-mail /etc/cron.daily/archivemail
+            chmod +x /etc/cron.daily/archivemail
+        else
+            HASH1=$(sha256sum /usr/local/bin/${PROJECT_NAME}-archive-mail | awk -F ' ' '{print $1}')
+            HASH2=$(sha256sum /etc/cron.daily/archivemail | awk -F ' ' '{print $1}')
+            if [[ "$HASH1" != "$HASH2" ]]; then
+                cp /usr/local/bin/${PROJECT_NAME}-archive-mail /etc/cron.daily/archivemail
+                chmod +x /etc/cron.daily/archivemail
+            fi
+        fi
     else
         if [ -f /usr/bin/${PROJECT_NAME}-archive-mail ]; then
-            cp /usr/bin/${PROJECT_NAME}-archive-mail /etc/cron.daily/archivemail
+            if [ ! -f /etc/cron.daily/archivemail ]; then
+                cp /usr/bin/${PROJECT_NAME}-archive-mail /etc/cron.daily/archivemail
+                chmod +x /etc/cron.daily/archivemail
+            else
+                HASH1=$(sha256sum /usr/local/bin/${PROJECT_NAME}-archive-mail | awk -F ' ' '{print $1}')
+                HASH2=$(sha256sum /etc/cron.daily/archivemail | awk -F ' ' '{print $1}')
+                if [[ "$HASH1" != "$HASH2" ]]; then
+                    cp /usr/local/bin/${PROJECT_NAME}-archive-mail /etc/cron.daily/archivemail
+                    chmod +x /etc/cron.daily/archivemail
+                fi
+            fi
         else
             echo "/usr/bin/${PROJECT_NAME}-archive-mail was not found. ${PROJECT_NAME} might not have fully installed."
             exit 62379
         fi
     fi
-    chmod +x /etc/cron.daily/archivemail
 
     # update to the next commit
     function_check set_repo_commit