Resized accounts must be rent exempt

sdk/src/account.rs

@@ -326,6 +326,21 @@ fn shared_new<T: WritableAccount>(lamports: u64, space: usize, owner: &Pubkey) -
     )
 }
 
+fn shared_new_rent_epoch<T: WritableAccount>(
+    lamports: u64,
+    space: usize,
+    owner: &Pubkey,
+    rent_epoch: Epoch,
+) -> T {
+    T::create(
+        lamports,
+        vec![0u8; space],
+        *owner,
+        bool::default(),
+        rent_epoch,
+    )
+}
+
 fn shared_new_ref<T: WritableAccount>(
     lamports: u64,
     space: usize,
@@ -434,6 +449,9 @@ impl Account {
     ) -> Result<RefCell<Self>, bincode::Error> {
         shared_new_ref_data_with_space(lamports, state, space, owner)
     }
+    pub fn new_rent_epoch(lamports: u64, space: usize, owner: &Pubkey, rent_epoch: Epoch) -> Self {
+        shared_new_rent_epoch(lamports, space, owner, rent_epoch)
+    }
     pub fn deserialize_data<T: serde::de::DeserializeOwned>(&self) -> Result<T, bincode::Error> {
         shared_deserialize_data(self)
     }
@@ -490,6 +508,9 @@ impl AccountSharedData {
     ) -> Result<RefCell<Self>, bincode::Error> {
         shared_new_ref_data_with_space(lamports, state, space, owner)
     }
+    pub fn new_rent_epoch(lamports: u64, space: usize, owner: &Pubkey, rent_epoch: Epoch) -> Self {
+        shared_new_rent_epoch(lamports, space, owner, rent_epoch)
+    }
     pub fn deserialize_data<T: serde::de::DeserializeOwned>(&self) -> Result<T, bincode::Error> {
         shared_deserialize_data(self)
     }

sdk/src/system_transaction.rs

@@ -27,6 +27,20 @@ pub fn create_account(
     Transaction::new(&[from_keypair, to_keypair], message, recent_blockhash)
 }
 
+/// Create and sign new SystemInstruction::Allocate transaction
+pub fn allocate(
+    payer_keypair: &Keypair,
+    account_keypair: &Keypair,
+    recent_blockhash: Hash,
+    space: u64,
+) -> Transaction {
+    let payer_pubkey = payer_keypair.pubkey();
+    let account_pubkey = account_keypair.pubkey();
+    let instruction = system_instruction::allocate(&account_pubkey, space);
+    let message = Message::new(&[instruction], Some(&payer_pubkey));
+    Transaction::new(&[payer_keypair, account_keypair], message, recent_blockhash)
+}
+
 /// Create and sign new system_instruction::Assign transaction
 pub fn assign(from_keypair: &Keypair, recent_blockhash: Hash, program_id: &Pubkey) -> Transaction {
     let from_pubkey = from_keypair.pubkey();