Add feature that disallows reverting append-only mode

.env.sample

@@ -35,6 +35,9 @@ SSH_SERVER_PORT_LAN=
 # Disable the DELETE feature
 #DISABLE_DELETE_REPO=true
 
+# Do not allow to remove append-only mode, once set
+#DISABLE_REVERT_APPEND_ONLY=true
+
 # Disable the integrations (API tokens to CRUD repositories)
 #DISABLE_INTEGRATIONS=true
 
@@ -50,4 +53,4 @@ MAIL_SMTP_PWD=
 MAIL_REJECT_SELFSIGNED_TLS=
 
 # Force app to start on IPv6
-#HOSTNAME=::
+#HOSTNAME=::

Containers/RepoManage/RepoManage.tsx

@@ -221,10 +221,18 @@ export default function RepoManage(props: RepoManageProps) {
             );
             router.replace('/');
           } else {
-            const errorMessage = await response.json();
-            toast.error(`An error has occurred : ${errorMessage.message.stderr}`, toastOptions);
-            router.replace('/');
-            console.log(`Fail to ${props.mode}`);
+            if (response.status == 403) {
+              toast.warning(
+                '🔒 The server is currently protected against reverting append-only mode.',
+                toastOptions
+              );
+              router.replace('/');
+            } else {
+              const errorMessage = await response.json();
+              toast.error(`An error has occurred : ${errorMessage.message.stderr}`, toastOptions);
+              router.replace('/');
+              console.log(`Fail to ${props.mode}`);
+            }
           }
         })
         .catch((error) => {

pages/api/v1/repositories/[slug]/index.ts

@@ -94,6 +94,15 @@ export default async function handler(
             'The SSH key is already used in another repository. Please use another key or delete the key from the other repository.',
         });
       }
+      if (repo.appendOnlyMode && appendOnlyMode === false) {
+	  if (process.env.DISABLE_REVERT_APPEND_ONLY === "true") {
+	    res.status(403).json({
+	    status: 403,
+	    message: 'Reverting Append-Only mode is disabled on this server',
+	    });
+	  return;
+	}
+      }
 
       const updatedRepo: Repository = {
         ...repo,