fix https://github.com/Neilpang/acme.sh/issues/1633

acme.sh

@@ -4676,19 +4676,19 @@ _installcert() {
     if [ -f "$_real_cert" ] && [ ! "$IS_RENEW" ]; then
       cp "$_real_cert" "$_backup_path/cert.bak"
     fi
-    cat "$CERT_PATH" >"$_real_cert"
+    cat "$CERT_PATH" >"$_real_cert" || return 1
   fi
 
   if [ "$_real_ca" ]; then
     _info "Installing CA to:$_real_ca"
     if [ "$_real_ca" = "$_real_cert" ]; then
       echo "" >>"$_real_ca"
-      cat "$CA_CERT_PATH" >>"$_real_ca"
+      cat "$CA_CERT_PATH" >>"$_real_ca" || return 1
     else
       if [ -f "$_real_ca" ] && [ ! "$IS_RENEW" ]; then
         cp "$_real_ca" "$_backup_path/ca.bak"
       fi
-      cat "$CA_CERT_PATH" >"$_real_ca"
+      cat "$CA_CERT_PATH" >"$_real_ca" || return 1
     fi
   fi
 
@@ -4698,9 +4698,9 @@ _installcert() {
       cp "$_real_key" "$_backup_path/key.bak"
     fi
     if [ -f "$_real_key" ]; then
-      cat "$CERT_KEY_PATH" >"$_real_key"
+      cat "$CERT_KEY_PATH" >"$_real_key" || return 1
     else
-      cat "$CERT_KEY_PATH" >"$_real_key"
+      cat "$CERT_KEY_PATH" >"$_real_key" || return 1
       chmod 600 "$_real_key"
     fi
   fi
@@ -4710,7 +4710,7 @@ _installcert() {
     if [ -f "$_real_fullchain" ] && [ ! "$IS_RENEW" ]; then
       cp "$_real_fullchain" "$_backup_path/fullchain.bak"
     fi
-    cat "$CERT_FULLCHAIN_PATH" >"$_real_fullchain"
+    cat "$CERT_FULLCHAIN_PATH" >"$_real_fullchain" || return 1
   fi
 
   if [ "$_reload_cmd" ]; then