check the file path before copying

acme.sh

@@ -5752,8 +5752,10 @@ _installcert() {
     if [ -f "$_real_cert" ] && [ ! "$_ACME_IS_RENEW" ]; then
       cp "$_real_cert" "$_backup_path/cert.bak"
     fi
+    if [ "$CERT_PATH" != "$_real_cert" ]; then
       cat "$CERT_PATH" >"$_real_cert" || return 1
     fi
+  fi
 
   if [ "$_real_ca" ]; then
     _info "Installing CA to: $_real_ca"
@@ -5764,15 +5766,18 @@ _installcert() {
       if [ -f "$_real_ca" ] && [ ! "$_ACME_IS_RENEW" ]; then
         cp "$_real_ca" "$_backup_path/ca.bak"
       fi
+      if [ "$CA_CERT_PATH" != "$_real_ca" ]; then
         cat "$CA_CERT_PATH" >"$_real_ca" || return 1
       fi
     fi
+  fi
 
   if [ "$_real_key" ]; then
     _info "Installing key to: $_real_key"
     if [ -f "$_real_key" ] && [ ! "$_ACME_IS_RENEW" ]; then
       cp "$_real_key" "$_backup_path/key.bak"
     fi
+    if [ "$CERT_KEY_PATH" != "$_real_key" ]; then
       if [ -f "$_real_key" ]; then
         cat "$CERT_KEY_PATH" >"$_real_key" || return 1
       else
@@ -5781,14 +5786,17 @@ _installcert() {
         cat "$CERT_KEY_PATH" >"$_real_key" || return 1
       fi
     fi
+  fi
 
   if [ "$_real_fullchain" ]; then
     _info "Installing full chain to: $_real_fullchain"
     if [ -f "$_real_fullchain" ] && [ ! "$_ACME_IS_RENEW" ]; then
       cp "$_real_fullchain" "$_backup_path/fullchain.bak"
     fi
+    if [ "$_real_fullchain" != "$CERT_FULLCHAIN_PATH" ]; then
       cat "$CERT_FULLCHAIN_PATH" >"$_real_fullchain" || return 1
     fi
+  fi
 
   if [ "$_reload_cmd" ]; then
     _info "Run reload cmd: $_reload_cmd"