Merge bitcoin/bitcoin#28195: blockstorage: Drop legacy -txindex check

fae405556d scripted-diff: Rename CBlockTreeDB -> BlockTreeDB (MarcoFalke)
faf63039cc Fixup style of moved code (MarcoFalke)
fa65111b99 move-only: Move CBlockTreeDB to node/blockstorage (MarcoFalke)
fa8685597e index: Drop legacy -txindex check (MarcoFalke)
fa69148a0a scripted-diff: Use blocks_path where possible (MarcoFalke)

Pull request description:

  The only reason for the check was to print a warning about an increase in storage use. Now that 22.x is EOL and everyone should have migrated (or decided to not care about storage use), remove the check.

  Also, a move-only commit is included. (Rebased from https://github.com/bitcoin/bitcoin/pull/22242)

ACKs for top commit:
  TheCharlatan:
    ACK fae405556d, though I lack historical context to really judge the second commit fa8685597e.
  stickies-v:
    ACK fae405556d

Tree-SHA512: 9da8f48767ae52d8e8e21c09a40c949cc0838794f1856cc5f58a91acd3f00a3bca818c8082242b3fdc9ca5badb09059570bb3870850d3807b75a8e23b5222da1
pull/28419/head
fanquake 8 months ago
commit ecab855838
No known key found for this signature in database
GPG Key ID: 2EEB9F5CC09526C1

@ -1555,11 +1555,6 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
// ********************************************************* Step 8: start indexers
if (args.GetBoolArg("-txindex", DEFAULT_TXINDEX)) {
auto result{WITH_LOCK(cs_main, return CheckLegacyTxindex(*Assert(chainman.m_blockman.m_block_tree_db)))};
if (!result) {
return InitError(util::ErrorString(result));
}
g_txindex = std::make_unique<TxIndex>(interfaces::MakeChain(node), cache_sizes.tx_index, false, fReindex);
node.indexes.emplace_back(g_txindex.get());
}

@ -7,6 +7,7 @@
#include <chain.h>
#include <clientversion.h>
#include <consensus/validation.h>
#include <dbwrapper.h>
#include <flatfile.h>
#include <hash.h>
#include <kernel/chainparams.h>
@ -15,15 +16,125 @@
#include <reverse_iterator.h>
#include <signet.h>
#include <streams.h>
#include <sync.h>
#include <undo.h>
#include <util/batchpriority.h>
#include <util/fs.h>
#include <util/signalinterrupt.h>
#include <util/translation.h>
#include <validation.h>
#include <map>
#include <unordered_map>
namespace kernel {
static constexpr uint8_t DB_BLOCK_FILES{'f'};
static constexpr uint8_t DB_BLOCK_INDEX{'b'};
static constexpr uint8_t DB_FLAG{'F'};
static constexpr uint8_t DB_REINDEX_FLAG{'R'};
static constexpr uint8_t DB_LAST_BLOCK{'l'};
// Keys used in previous version that might still be found in the DB:
// BlockTreeDB::DB_TXINDEX_BLOCK{'T'};
// BlockTreeDB::DB_TXINDEX{'t'}
// BlockTreeDB::ReadFlag("txindex")
bool BlockTreeDB::ReadBlockFileInfo(int nFile, CBlockFileInfo& info)
{
return Read(std::make_pair(DB_BLOCK_FILES, nFile), info);
}
bool BlockTreeDB::WriteReindexing(bool fReindexing)
{
if (fReindexing) {
return Write(DB_REINDEX_FLAG, uint8_t{'1'});
} else {
return Erase(DB_REINDEX_FLAG);
}
}
void BlockTreeDB::ReadReindexing(bool& fReindexing)
{
fReindexing = Exists(DB_REINDEX_FLAG);
}
bool BlockTreeDB::ReadLastBlockFile(int& nFile)
{
return Read(DB_LAST_BLOCK, nFile);
}
bool BlockTreeDB::WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*>>& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo)
{
CDBBatch batch(*this);
for (const auto& [file, info] : fileInfo) {
batch.Write(std::make_pair(DB_BLOCK_FILES, file), *info);
}
batch.Write(DB_LAST_BLOCK, nLastFile);
for (const CBlockIndex* bi : blockinfo) {
batch.Write(std::make_pair(DB_BLOCK_INDEX, bi->GetBlockHash()), CDiskBlockIndex{bi});
}
return WriteBatch(batch, true);
}
bool BlockTreeDB::WriteFlag(const std::string& name, bool fValue)
{
return Write(std::make_pair(DB_FLAG, name), fValue ? uint8_t{'1'} : uint8_t{'0'});
}
bool BlockTreeDB::ReadFlag(const std::string& name, bool& fValue)
{
uint8_t ch;
if (!Read(std::make_pair(DB_FLAG, name), ch)) {
return false;
}
fValue = ch == uint8_t{'1'};
return true;
}
bool BlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex, const util::SignalInterrupt& interrupt)
{
AssertLockHeld(::cs_main);
std::unique_ptr<CDBIterator> pcursor(NewIterator());
pcursor->Seek(std::make_pair(DB_BLOCK_INDEX, uint256()));
// Load m_block_index
while (pcursor->Valid()) {
if (interrupt) return false;
std::pair<uint8_t, uint256> key;
if (pcursor->GetKey(key) && key.first == DB_BLOCK_INDEX) {
CDiskBlockIndex diskindex;
if (pcursor->GetValue(diskindex)) {
// Construct block index object
CBlockIndex* pindexNew = insertBlockIndex(diskindex.ConstructBlockHash());
pindexNew->pprev = insertBlockIndex(diskindex.hashPrev);
pindexNew->nHeight = diskindex.nHeight;
pindexNew->nFile = diskindex.nFile;
pindexNew->nDataPos = diskindex.nDataPos;
pindexNew->nUndoPos = diskindex.nUndoPos;
pindexNew->nVersion = diskindex.nVersion;
pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
pindexNew->nTime = diskindex.nTime;
pindexNew->nBits = diskindex.nBits;
pindexNew->nNonce = diskindex.nNonce;
pindexNew->nStatus = diskindex.nStatus;
pindexNew->nTx = diskindex.nTx;
if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits, consensusParams)) {
return error("%s: CheckProofOfWork failed: %s", __func__, pindexNew->ToString());
}
pcursor->Next();
} else {
return error("%s: failed to read value", __func__);
}
} else {
break;
}
}
return true;
}
} // namespace kernel
namespace node {
std::atomic_bool fReindex(false);

@ -7,17 +7,25 @@
#include <attributes.h>
#include <chain.h>
#include <dbwrapper.h>
#include <kernel/blockmanager_opts.h>
#include <kernel/chainparams.h>
#include <kernel/cs_main.h>
#include <protocol.h>
#include <sync.h>
#include <txdb.h>
#include <util/fs.h>
#include <util/hasher.h>
#include <atomic>
#include <cstdint>
#include <functional>
#include <limits>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
class BlockValidationState;
@ -36,7 +44,26 @@ namespace util {
class SignalInterrupt;
} // namespace util
namespace kernel {
/** Access to the block database (blocks/index/) */
class BlockTreeDB : public CDBWrapper
{
public:
using CDBWrapper::CDBWrapper;
bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*>>& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
bool ReadBlockFileInfo(int nFile, CBlockFileInfo& info);
bool ReadLastBlockFile(int& nFile);
bool WriteReindexing(bool fReindexing);
void ReadReindexing(bool& fReindexing);
bool WriteFlag(const std::string& name, bool fValue);
bool ReadFlag(const std::string& name, bool& fValue);
bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex, const util::SignalInterrupt& interrupt)
EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
};
} // namespace kernel
namespace node {
using kernel::BlockTreeDB;
/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
@ -185,7 +212,7 @@ public:
*/
std::multimap<CBlockIndex*, CBlockIndex*> m_blocks_unlinked;
std::unique_ptr<CBlockTreeDB> m_block_tree_db GUARDED_BY(::cs_main);
std::unique_ptr<BlockTreeDB> m_block_tree_db GUARDED_BY(::cs_main);
bool WriteBlockIndexDB() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
bool LoadBlockIndexDB() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

@ -37,10 +37,10 @@ static ChainstateLoadResult CompleteChainstateInitialization(
const ChainstateLoadOptions& options) EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
{
auto& pblocktree{chainman.m_blockman.m_block_tree_db};
// new CBlockTreeDB tries to delete the existing file, which
// new BlockTreeDB tries to delete the existing file, which
// fails if it's still open from the previous loop. Close it first:
pblocktree.reset();
pblocktree = std::make_unique<CBlockTreeDB>(DBParams{
pblocktree = std::make_unique<BlockTreeDB>(DBParams{
.path = chainman.m_options.datadir / "blocks" / "index",
.cache_bytes = static_cast<size_t>(cache_sizes.block_tree_db),
.memory_only = options.block_tree_db_in_memory,

@ -64,6 +64,7 @@
#include <functional>
#include <stdexcept>
using kernel::BlockTreeDB;
using kernel::ValidationCacheSizes;
using node::ApplyArgsManOptions;
using node::BlockAssembler;
@ -182,7 +183,7 @@ ChainTestingSetup::ChainTestingSetup(const ChainType chainType, const std::vecto
.notifications = chainman_opts.notifications,
};
m_node.chainman = std::make_unique<ChainstateManager>(m_node.kernel->interrupt, chainman_opts, blockman_opts);
m_node.chainman->m_blockman.m_block_tree_db = std::make_unique<CBlockTreeDB>(DBParams{
m_node.chainman->m_blockman.m_block_tree_db = std::make_unique<BlockTreeDB>(DBParams{
.path = m_args.GetDataDirNet() / "blocks" / "index",
.cache_bytes = static_cast<size_t>(m_cache_sizes.block_tree_db),
.memory_only = true});

@ -5,49 +5,25 @@
#include <txdb.h>
#include <chain.h>
#include <coins.h>
#include <dbwrapper.h>
#include <logging.h>
#include <pow.h>
#include <primitives/transaction.h>
#include <random.h>
#include <serialize.h>
#include <uint256.h>
#include <util/signalinterrupt.h>
#include <util/translation.h>
#include <util/vector.h>
#include <stdint.h>
#include <cassert>
#include <cstdlib>
#include <iterator>
#include <utility>
static constexpr uint8_t DB_COIN{'C'};
static constexpr uint8_t DB_BLOCK_FILES{'f'};
static constexpr uint8_t DB_BLOCK_INDEX{'b'};
static constexpr uint8_t DB_BEST_BLOCK{'B'};
static constexpr uint8_t DB_HEAD_BLOCKS{'H'};
static constexpr uint8_t DB_FLAG{'F'};
static constexpr uint8_t DB_REINDEX_FLAG{'R'};
static constexpr uint8_t DB_LAST_BLOCK{'l'};
// Keys used in previous version that might still be found in the DB:
static constexpr uint8_t DB_COINS{'c'};
static constexpr uint8_t DB_TXINDEX_BLOCK{'T'};
// uint8_t DB_TXINDEX{'t'}
util::Result<void> CheckLegacyTxindex(CBlockTreeDB& block_tree_db)
{
CBlockLocator ignored{};
if (block_tree_db.Read(DB_TXINDEX_BLOCK, ignored)) {
return util::Error{_("The -txindex upgrade started by a previous version cannot be completed. Restart with the previous version or run a full -reindex.")};
}
bool txindex_legacy_flag{false};
block_tree_db.ReadFlag("txindex", txindex_legacy_flag);
if (txindex_legacy_flag) {
// Disable legacy txindex and warn once about occupied disk space
if (!block_tree_db.WriteFlag("txindex", false)) {
return util::Error{Untranslated("Failed to write block index db flag 'txindex'='0'")};
}
return util::Error{_("The block index db contains a legacy 'txindex'. To clear the occupied disk space, run a full -reindex, otherwise ignore this error. This error message will not be displayed again.")};
}
return {};
}
bool CCoinsViewDB::NeedsUpgrade()
{
@ -178,25 +154,6 @@ size_t CCoinsViewDB::EstimateSize() const
return m_db->EstimateSize(DB_COIN, uint8_t(DB_COIN + 1));
}
bool CBlockTreeDB::ReadBlockFileInfo(int nFile, CBlockFileInfo &info) {
return Read(std::make_pair(DB_BLOCK_FILES, nFile), info);
}
bool CBlockTreeDB::WriteReindexing(bool fReindexing) {
if (fReindexing)
return Write(DB_REINDEX_FLAG, uint8_t{'1'});
else
return Erase(DB_REINDEX_FLAG);
}
void CBlockTreeDB::ReadReindexing(bool &fReindexing) {
fReindexing = Exists(DB_REINDEX_FLAG);
}
bool CBlockTreeDB::ReadLastBlockFile(int &nFile) {
return Read(DB_LAST_BLOCK, nFile);
}
/** Specialization of CCoinsViewCursor to iterate over a CCoinsViewDB */
class CCoinsViewDBCursor: public CCoinsViewCursor
{
@ -269,71 +226,3 @@ void CCoinsViewDBCursor::Next()
keyTmp.first = entry.key;
}
}
bool CBlockTreeDB::WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo) {
CDBBatch batch(*this);
for (std::vector<std::pair<int, const CBlockFileInfo*> >::const_iterator it=fileInfo.begin(); it != fileInfo.end(); it++) {
batch.Write(std::make_pair(DB_BLOCK_FILES, it->first), *it->second);
}
batch.Write(DB_LAST_BLOCK, nLastFile);
for (std::vector<const CBlockIndex*>::const_iterator it=blockinfo.begin(); it != blockinfo.end(); it++) {
batch.Write(std::make_pair(DB_BLOCK_INDEX, (*it)->GetBlockHash()), CDiskBlockIndex(*it));
}
return WriteBatch(batch, true);
}
bool CBlockTreeDB::WriteFlag(const std::string &name, bool fValue) {
return Write(std::make_pair(DB_FLAG, name), fValue ? uint8_t{'1'} : uint8_t{'0'});
}
bool CBlockTreeDB::ReadFlag(const std::string &name, bool &fValue) {
uint8_t ch;
if (!Read(std::make_pair(DB_FLAG, name), ch))
return false;
fValue = ch == uint8_t{'1'};
return true;
}
bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex, const util::SignalInterrupt& interrupt)
{
AssertLockHeld(::cs_main);
std::unique_ptr<CDBIterator> pcursor(NewIterator());
pcursor->Seek(std::make_pair(DB_BLOCK_INDEX, uint256()));
// Load m_block_index
while (pcursor->Valid()) {
if (interrupt) return false;
std::pair<uint8_t, uint256> key;
if (pcursor->GetKey(key) && key.first == DB_BLOCK_INDEX) {
CDiskBlockIndex diskindex;
if (pcursor->GetValue(diskindex)) {
// Construct block index object
CBlockIndex* pindexNew = insertBlockIndex(diskindex.ConstructBlockHash());
pindexNew->pprev = insertBlockIndex(diskindex.hashPrev);
pindexNew->nHeight = diskindex.nHeight;
pindexNew->nFile = diskindex.nFile;
pindexNew->nDataPos = diskindex.nDataPos;
pindexNew->nUndoPos = diskindex.nUndoPos;
pindexNew->nVersion = diskindex.nVersion;
pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
pindexNew->nTime = diskindex.nTime;
pindexNew->nBits = diskindex.nBits;
pindexNew->nNonce = diskindex.nNonce;
pindexNew->nStatus = diskindex.nStatus;
pindexNew->nTx = diskindex.nTx;
if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits, consensusParams)) {
return error("%s: CheckProofOfWork failed: %s", __func__, pindexNew->ToString());
}
pcursor->Next();
} else {
return error("%s: failed to read value", __func__);
}
} else {
break;
}
}
return true;
}

@ -11,27 +11,15 @@
#include <kernel/cs_main.h>
#include <sync.h>
#include <util/fs.h>
#include <util/result.h>
#include <cstddef>
#include <cstdint>
#include <functional>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
class CBlockFileInfo;
class CBlockIndex;
class COutPoint;
class uint256;
namespace Consensus {
struct Params;
};
namespace util {
class SignalInterrupt;
} // namespace util
//! -dbcache default (MiB)
static const int64_t nDefaultDbCache = 450;
@ -89,22 +77,4 @@ public:
std::optional<fs::path> StoragePath() { return m_db->StoragePath(); }
};
/** Access to the block database (blocks/index/) */
class CBlockTreeDB : public CDBWrapper
{
public:
using CDBWrapper::CDBWrapper;
bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
bool ReadBlockFileInfo(int nFile, CBlockFileInfo &info);
bool ReadLastBlockFile(int &nFile);
bool WriteReindexing(bool fReindexing);
void ReadReindexing(bool &fReindexing);
bool WriteFlag(const std::string &name, bool fValue);
bool ReadFlag(const std::string &name, bool &fValue);
bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex, const util::SignalInterrupt& interrupt)
EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
};
[[nodiscard]] util::Result<void> CheckLegacyTxindex(CBlockTreeDB& block_tree_db);
#endif // BITCOIN_TXDB_H

@ -47,7 +47,6 @@
#include <vector>
class Chainstate;
class CBlockTreeDB;
class CTxMemPool;
class ChainstateManager;
struct ChainTxData;

@ -18,7 +18,7 @@ class BlocksdirTest(BitcoinTestFramework):
def run_test(self):
self.stop_node(0)
assert os.path.isdir(os.path.join(self.nodes[0].chain_path, "blocks"))
assert os.path.isdir(os.path.join(self.nodes[0].blocks_path))
assert not os.path.isdir(os.path.join(self.nodes[0].datadir, "blocks"))
shutil.rmtree(self.nodes[0].datadir)
initialize_datadir(self.options.tmpdir, 0, self.chain)
@ -31,7 +31,7 @@ class BlocksdirTest(BitcoinTestFramework):
self.log.info("mining blocks..")
self.generatetoaddress(self.nodes[0], 10, self.nodes[0].get_deterministic_priv_key().address)
assert os.path.isfile(os.path.join(blocksdir_path, self.chain, "blocks", "blk00000.dat"))
assert os.path.isdir(os.path.join(self.nodes[0].chain_path, "blocks", "index"))
assert os.path.isdir(os.path.join(self.nodes[0].blocks_path, "index"))
if __name__ == '__main__':

@ -91,7 +91,7 @@ class PruneTest(BitcoinTestFramework):
def setup_network(self):
self.setup_nodes()
self.prunedir = os.path.join(self.nodes[2].chain_path, 'blocks', '')
self.prunedir = os.path.join(self.nodes[2].blocks_path, '')
self.connect_nodes(0, 1)
self.connect_nodes(1, 2)
@ -290,7 +290,7 @@ class PruneTest(BitcoinTestFramework):
assert_equal(ret + 1, node.getblockchaininfo()['pruneheight'])
def has_block(index):
return os.path.isfile(os.path.join(self.nodes[node_number].chain_path, "blocks", f"blk{index:05}.dat"))
return os.path.isfile(os.path.join(self.nodes[node_number].blocks_path, f"blk{index:05}.dat"))
# should not prune because chain tip of node 3 (995) < PruneAfterHeight (1000)
assert_raises_rpc_error(-1, "Blockchain is too short for pruning", node.pruneblockchain, height(500))

@ -7,7 +7,6 @@
Previous releases are required by this test, see test/README.md.
"""
import os
import shutil
from test_framework.test_framework import BitcoinTestFramework
@ -55,10 +54,6 @@ class TxindexCompatibilityTest(BitcoinTestFramework):
drop_index_chain_dir = self.nodes[1].chain_path
shutil.rmtree(drop_index_chain_dir)
shutil.copytree(legacy_chain_dir, drop_index_chain_dir)
self.nodes[1].assert_start_raises_init_error(
extra_args=["-txindex"],
expected_msg="Error: The block index db contains a legacy 'txindex'. To clear the occupied disk space, run a full -reindex, otherwise ignore this error. This error message will not be displayed again.",
)
# Build txindex from scratch and check there is no error this time
self.start_node(1, extra_args=["-txindex"])
self.wait_until(lambda: self.nodes[1].getindexinfo()["txindex"]["synced"] == True)
@ -66,12 +61,6 @@ class TxindexCompatibilityTest(BitcoinTestFramework):
self.stop_nodes()
self.log.info("Check migrated txindex cannot be read by legacy node")
err_msg = f": You need to rebuild the database using -reindex to change -txindex.{os.linesep}Please restart with -reindex or -reindex-chainstate to recover."
shutil.rmtree(legacy_chain_dir)
shutil.copytree(drop_index_chain_dir, legacy_chain_dir)
self.nodes[0].assert_start_raises_init_error(extra_args=["-txindex"], expected_msg=err_msg)
if __name__ == "__main__":
TxindexCompatibilityTest().main()

@ -221,7 +221,7 @@ class WalletBackupTest(BitcoinTestFramework):
self.erase_three()
#start node2 with no chain
shutil.rmtree(os.path.join(self.nodes[2].chain_path, 'blocks'))
shutil.rmtree(os.path.join(self.nodes[2].blocks_path))
shutil.rmtree(os.path.join(self.nodes[2].chain_path, 'chainstate'))
self.start_three(["-nowallet"])

@ -87,7 +87,7 @@ class WalletHDTest(BitcoinTestFramework):
self.stop_node(1)
# we need to delete the complete chain directory
# otherwise node1 would auto-recover all funds in flag the keypool keys as used
shutil.rmtree(os.path.join(self.nodes[1].chain_path, "blocks"))
shutil.rmtree(os.path.join(self.nodes[1].blocks_path))
shutil.rmtree(os.path.join(self.nodes[1].chain_path, "chainstate"))
shutil.copyfile(
os.path.join(self.nodes[1].datadir, "hd.bak"),
@ -115,7 +115,7 @@ class WalletHDTest(BitcoinTestFramework):
# Try a RPC based rescan
self.stop_node(1)
shutil.rmtree(os.path.join(self.nodes[1].chain_path, "blocks"))
shutil.rmtree(os.path.join(self.nodes[1].blocks_path))
shutil.rmtree(os.path.join(self.nodes[1].chain_path, "chainstate"))
shutil.copyfile(
os.path.join(self.nodes[1].datadir, "hd.bak"),

@ -106,7 +106,7 @@ class WalletPruningTest(BitcoinTestFramework):
def has_block(self, block_index):
"""Checks if the pruned node has the specific blk0000*.dat file"""
return os.path.isfile(os.path.join(self.nodes[1].chain_path, "blocks", f"blk{block_index:05}.dat"))
return os.path.isfile(os.path.join(self.nodes[1].blocks_path, f"blk{block_index:05}.dat"))
def create_wallet(self, wallet_name, *, unload=False):
"""Creates and dumps a wallet on the non-pruned node0 to be later import by the pruned node"""

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