check the file path before copying

acme.sh

@@ -5752,7 +5752,9 @@ _installcert() {
     if [ -f "$_real_cert" ] && [ ! "$_ACME_IS_RENEW" ]; then
       cp "$_real_cert" "$_backup_path/cert.bak"
     fi
-    cat "$CERT_PATH" >"$_real_cert" || return 1
+    if [ "$CERT_PATH" != "$_real_cert" ]; then
+      cat "$CERT_PATH" >"$_real_cert" || return 1
+    fi
   fi
 
   if [ "$_real_ca" ]; then
@@ -5764,7 +5766,9 @@ _installcert() {
       if [ -f "$_real_ca" ] && [ ! "$_ACME_IS_RENEW" ]; then
         cp "$_real_ca" "$_backup_path/ca.bak"
       fi
-      cat "$CA_CERT_PATH" >"$_real_ca" || return 1
+      if [ "$CA_CERT_PATH" != "$_real_ca" ]; then
+        cat "$CA_CERT_PATH" >"$_real_ca" || return 1
+      fi
     fi
   fi
 
@@ -5773,12 +5777,14 @@ _installcert() {
     if [ -f "$_real_key" ] && [ ! "$_ACME_IS_RENEW" ]; then
       cp "$_real_key" "$_backup_path/key.bak"
     fi
-    if [ -f "$_real_key" ]; then
-      cat "$CERT_KEY_PATH" >"$_real_key" || return 1
-    else
-      touch "$_real_key" || return 1
-      chmod 600 "$_real_key"
-      cat "$CERT_KEY_PATH" >"$_real_key" || return 1
+    if [ "$CERT_KEY_PATH" != "$_real_key" ]; then
+      if [ -f "$_real_key" ]; then
+        cat "$CERT_KEY_PATH" >"$_real_key" || return 1
+      else
+        touch "$_real_key" || return 1
+        chmod 600 "$_real_key"
+        cat "$CERT_KEY_PATH" >"$_real_key" || return 1
+      fi
     fi
   fi
 
@@ -5787,7 +5793,9 @@ _installcert() {
     if [ -f "$_real_fullchain" ] && [ ! "$_ACME_IS_RENEW" ]; then
       cp "$_real_fullchain" "$_backup_path/fullchain.bak"
     fi
-    cat "$CERT_FULLCHAIN_PATH" >"$_real_fullchain" || return 1
+    if [ "$_real_fullchain" != "$CERT_FULLCHAIN_PATH" ]; then
+      cat "$CERT_FULLCHAIN_PATH" >"$_real_fullchain" || return 1
+    fi
   fi
 
   if [ "$_reload_cmd" ]; then