datastore: remove load_manifest_json

There's no point in having that as a seperate method, just parse the
thing into a struct and write it back out correctly.

Also makes further changes to the method simpler.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>

src/backup/datastore.rs

@@ -6,7 +6,6 @@ use std::convert::TryFrom;
 
 use anyhow::{bail, format_err, Error};
 use lazy_static::lazy_static;
-use serde_json::Value;
 
 use proxmox::tools::fs::{replace_file, CreateOptions};
 
@@ -623,22 +622,12 @@ impl DataStore {
         Ok((manifest, raw_size))
     }
 
-    pub fn load_manifest_json(
-        &self,
-        backup_dir: &BackupDir,
-    ) -> Result<Value, Error> {
-        let blob = self.load_blob(backup_dir, MANIFEST_BLOB_NAME)?;
-        // no expected digest available
-        let manifest_data = blob.decode(None, None)?;
-        let manifest: Value = serde_json::from_slice(&manifest_data[..])?;
-        Ok(manifest)
-    }
-
     pub fn store_manifest(
         &self,
         backup_dir: &BackupDir,
-        manifest: Value,
+        manifest: BackupManifest,
     ) -> Result<(), Error> {
+        let manifest = serde_json::to_value(manifest)?;
         let manifest = serde_json::to_string_pretty(&manifest)?;
         let blob = DataBlob::encode(manifest.as_bytes(), None, true)?;
         let raw_data = blob.raw_data();

src/backup/verify.rs

@@ -368,7 +368,7 @@ pub fn verify_backup_dir(
         upid,
     };
     manifest.unprotected["verify_state"] = serde_json::to_value(verify_state)?;
-    datastore.store_manifest(&backup_dir, serde_json::to_value(manifest)?)
+    datastore.store_manifest(&backup_dir, manifest)
         .map_err(|err| format_err!("unable to store manifest blob - {}", err))?;
 
     Ok(error_count == 0)