A more convenient store-tool (solana-labs#26796)

* Use new_from_file_unchecked - don't sanitize input length for appendvec file

* Exit-early on completely zeroed accounts

runtime/store-tool/Cargo.toml

@@ -14,6 +14,7 @@ clap = "2.33.1"
 log = { version = "0.4.17" }
 solana-logger = { path = "../../logger", version = "=1.12.0" }
 solana-runtime = { path = "..", version = "=1.12.0" }
+solana-sdk = { path = "../../sdk", version = "=1.12.0" }
 solana-version = { path = "../../version", version = "=1.12.0" }
 
 [package.metadata.docs.rs]

runtime/store-tool/src/main.rs

@@ -1,7 +1,8 @@
 use {
-    clap::{crate_description, crate_name, value_t_or_exit, App, Arg},
+    clap::{crate_description, crate_name, value_t, value_t_or_exit, App, Arg},
     log::*,
-    solana_runtime::append_vec::AppendVec,
+    solana_runtime::append_vec::{AppendVec, StoredAccountMeta},
+    solana_sdk::{account::AccountSharedData, hash::Hash, pubkey::Pubkey},
 };
 
 fn main() {
@@ -26,21 +27,37 @@ fn main() {
         .get_matches();
 
     let file = value_t_or_exit!(matches, "file", String);
-    let len = value_t_or_exit!(matches, "len", usize);
-    let (mut store, num_accounts) = AppendVec::new_from_file(file, len).expect("should succeed");
+    let len = value_t!(matches, "len", usize)
+        .unwrap_or_else(|_| std::fs::metadata(&file).unwrap().len() as usize);
+
+    let mut store = AppendVec::new_from_file_unchecked(file, len).expect("should succeed");
     store.set_no_remove_on_drop();
-    info!(
-        "store: len: {} capacity: {} accounts: {}",
-        store.len(),
-        store.capacity(),
-        num_accounts,
-    );
+    info!("store: len: {} capacity: {}", store.len(), store.capacity());
+    let mut num_accounts: usize = 0;
+    let mut stored_accounts_len: usize = 0;
     for account in store.account_iter() {
+        if is_account_zeroed(&account) {
+            break;
+        }
         info!(
             "  account: {:?} version: {} data: {} hash: {:?}",
             account.meta.pubkey, account.meta.write_version, account.meta.data_len, account.hash
         );
+        num_accounts = num_accounts.saturating_add(1);
+        stored_accounts_len = stored_accounts_len.saturating_add(account.stored_size);
     }
+    info!(
+        "num_accounts: {} stored_accounts_len: {}",
+        num_accounts, stored_accounts_len
+    );
+}
+
+fn is_account_zeroed(account: &StoredAccountMeta) -> bool {
+    account.hash == &Hash::default()
+        && account.meta.data_len == 0
+        && account.meta.write_version == 0
+        && account.meta.pubkey == Pubkey::default()
+        && account.clone_account() == AccountSharedData::default()
 }
 
 #[cfg(test)]