File system warnings

A method comprising:

• receiving modification data at a client application associated with a client synchronization service resulting in a change in a directory of a local file system of a client device, wherein the modification data is the result of a change to a content item or a directory on the client device;
• updating a local tree on the client device based on the modification data;
• determining, by the client application on the client device, that there is a difference between the local tree and a sync tree on the client device, wherein the sync tree represents a known synced state between a server state and a file system state, the local tree represents the file system state of the local file system of the client device;
• notifying a content management system of the difference between the local tree and the sync tree to validate a propriety of the change;
• subsequent to notifying the content management system of the difference between the local tree and the sync tree, receiving an instruction to present a file system warning that includes a message stating that the change in the directory is not allowed, wherein the message is presented in a user interface of the client device regarding the modification data;
• receive events from the content management system that are effective to undo the modification data;
• and
• apply the events to restore the directory of the local file system, the local tree, and the sync tree to a previous synchronized state prior to the modification data.

A computing system comprising:

• at least one processor;
• and
• at least one memory having instructions stored thereon, that when executed the instructions are effective to cause the at least one processor to:
• receive modification data at a client application associated with a client synchronization service resulting in a change in a directory of a local file system of a client device, wherein the modification data is the result of a change to a content item or a directory on the client device;
• update a local tree on the client device based on the modification data;
• determine, by the client application on the client device, that there is a difference between the local tree and a sync tree on the client device, wherein the sync tree represents a known synced state between a server state and a file system state, the local tree represents the file system state of the local file system of the client device;
• notify a content management system of the difference between the local tree and the sync tree to validate a propriety of the change;
• subsequent to notifying the content management system of the difference between the local tree and the sync tree, receive an instruction to present a file system warning in a user interface of the client device regarding the modification data;
• receive events from the content management system that are effective to undo the modification data;
• and
• apply the events to restore the directory of the local file system, the local tree, and the sync tree to a previous synchronized state prior to the modification data.