fix acme script downloading and better error handling

renew_cert.sh

@@ -37,20 +37,20 @@ if [ ! -d "$acme_dir" ]; then
   exit 1
 fi
 
-if [ ! -f "$account_key" ]; then
+if [ ! -s "$account_key" ]; then
   echo "Account Key doesn't exists!"
   exit 1
 fi
 
-if [ ! -f "$acme_tiny" ]; then
-  echo "Python script acme_tiny.py is missing. Downloading... "
-  wget -qo $acme_tiny https://raw.githubusercontent.com/diafygi/acme-tiny/4.0.4/acme_tiny.py
+if [ ! -s "$acme_tiny" ]; then
+  echo -n "Python script acme_tiny.py is missing. Downloading... "
+  wget -qO "$acme_tiny" https://raw.githubusercontent.com/diafygi/acme-tiny/4.0.4/acme_tiny.py
   if [ $? != 0 ]; then
-    echo "Could not download acme_tiny.py script."
-    rm -rf $acme_tiny
+    echo -ne "\nCould not download acme_tiny.py script.\n"
+    rm -rf "$acme_tiny"
     exit 1
   fi
-  echo "Finished"
+  echo -ne "Finished\n"
 fi
 
 acme_dir=${acme_dir%/}
@@ -70,7 +70,7 @@ do
     continue
   fi
 
-  if [ ! -f "$arg/domain.conf" ]; then
+  if [ ! -s "$arg/domain.conf" ]; then
     echo "Configuration file doen't exists!"
     continue
   fi
@@ -94,7 +94,7 @@ do
   # domain key
   key="$arg/$NAME.key"
 
-  if [ ! -f "$key" ]; then
+  if [ ! -s "$key" ]; then
     echo "Domain key doesn't exists. Generating..."
     openssl genrsa 4096 > "$key"
     #openssl ecparam -out "$key" -name secp384r1 -genkey
@@ -103,7 +103,7 @@ do
   # domain csr
   csr="$arg/$NAME.csr"
 
-  if [ ! -f "$csr" ]; then
+  if [ ! -s "$csr" ]; then
     echo "Domain csr file doesn't exists. Generating..."
     if [ ${#DOMAINS[@]} -eq 1 ]; then
       # single domain