Major Subsystem Rewrite (Reconciler Mk5) (#217)

server/src/imfs/snapshot.rs

@@ -0,0 +1,38 @@
+use std::collections::HashMap;
+
+#[derive(Debug, Clone)]
+pub enum ImfsSnapshot {
+    File(FileSnapshot),
+    Directory(DirectorySnapshot),
+}
+
+impl ImfsSnapshot {
+    /// Create a new file ImfsSnapshot with the given contents.
+    pub fn file(contents: impl Into<Vec<u8>>) -> ImfsSnapshot {
+        ImfsSnapshot::File(FileSnapshot {
+            contents: contents.into(),
+        })
+    }
+
+    /// Create a new directory ImfsSnapshot with the given children.
+    pub fn dir<S: Into<String>>(children: HashMap<S, ImfsSnapshot>) -> ImfsSnapshot {
+        let children = children
+            .into_iter()
+            .map(|(k, v)| (k.into(), v))
+            .collect();
+
+        ImfsSnapshot::Directory(DirectorySnapshot {
+            children,
+        })
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct FileSnapshot {
+    pub contents: Vec<u8>,
+}
+
+#[derive(Debug, Clone)]
+pub struct DirectorySnapshot {
+    pub children: HashMap<String, ImfsSnapshot>,
+}