feat! use SQLite db for chunk index on server

This speeds startup a lot. However, the backup repository needs to be
re-created from scratch and internal APIs have change in incompatible
ways.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/error.rs b/src/error.rs
index 360e62d..a35a99c 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -13,6 +13,12 @@ pub enum ObnamError {
     #[error("Server response did not have a 'chunk-meta' header for chunk {0}")]
     NoChunkMeta(String),
 
-    #[error("Wrong checksum for chunk {0}")]
-    WrongChecksum(String),
+    #[error("Wrong checksum for chunk {0}, got {1}, expected {2}")]
+    WrongChecksum(String, String, String),
+
+    #[error("Chunk is missing: {0}")]
+    MissingChunk(String),
+
+    #[error("Chunk is in store too many times: {0}")]
+    DuplicateChunk(String),
 }