src/backup/archive_index.rs: first try

src/backup/datastore.rs

@@ -8,6 +8,7 @@ use std::sync::{Mutex, Arc};
 use crate::config::datastore;
 use super::chunk_store::*;
 use super::image_index::*;
+use super::archive_index::*;
 
 pub struct DataStore {
     chunk_store: ChunkStore,
@@ -76,6 +77,16 @@ impl DataStore {
         Ok(index)
     }
 
+    pub fn create_archive_writer<P: AsRef<Path>>(
+        &self, filename: P,
+        chunk_size: usize
+    ) -> Result<ArchiveIndexWriter, Error> {
+
+        let index = ArchiveIndexWriter::create(&self.chunk_store, filename.as_ref(), chunk_size)?;
+
+        Ok(index)
+    }
+
     pub fn list_images(&self) -> Result<Vec<PathBuf>, Error> {
         let base = self.chunk_store.base_path();