Add `persist-snapshot` to bricks sync (#66)

Tested manually

We are adding this flag because the default bricks sync is not robust
against changing the profile and other project config changes. This will
be used in the initial version of the vscode extention

cmd/sync/sync.go

@@ -59,8 +59,11 @@ var interval *time.Duration
 
 var remotePath *string
 
+var persistSnapshot *bool
+
 func init() {
 	root.RootCmd.AddCommand(syncCmd)
 	interval = syncCmd.Flags().Duration("interval", 1*time.Second, "project files polling interval")
 	remotePath = syncCmd.Flags().String("remote-path", "", "remote path to store repo in. eg: /Repos/me@example.com/test-repo")
+	persistSnapshot = syncCmd.Flags().Bool("persist-snapshot", true, "whether to store local snapshots of sync state")
 }

cmd/sync/watchdog.go

@@ -94,13 +94,14 @@ func (w *watchdog) main(ctx context.Context, applyDiff func(diff) error) {
 	// load from json or sync it every time there's an action
 	state := snapshot{}
 	root := w.files.Root()
+	if *persistSnapshot {
 		err := state.loadSnapshot(root)
 		if err != nil {
 			log.Printf("[ERROR] cannot load snapshot: %s", err)
 			w.failure = err
 			return
 		}
-
+	}
 	for {
 		select {
 		case <-ctx.Done():
@@ -122,6 +123,7 @@ func (w *watchdog) main(ctx context.Context, applyDiff func(diff) error) {
 				w.failure = err
 				return
 			}
+			if *persistSnapshot {
 				err = state.storeSnapshot(root)
 				if err != nil {
 					log.Printf("[ERROR] cannot store snapshot: %s", err)
@@ -131,3 +133,4 @@ func (w *watchdog) main(ctx context.Context, applyDiff func(diff) error) {
 			}
 		}
 	}
+}