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#!/usr/bin/env python3
# Copyright (c) 2023-present The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Test running bitcoind with -reindex from a read-only blockstore
- Start a node, generate blocks, then restart with -reindex after setting blk files to read-only
"""
import os
import stat
import subprocess
from test_framework.test_framework import BitcoinTestFramework
class BlockstoreReindexTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 1
self.extra_args = [["-fastprune"]]
def reindex_readonly(self):
self.log.debug("Generate block big enough to start second block file")
fastprune_blockfile_size = 0x10000
opreturn = "6a"
nulldata = fastprune_blockfile_size * "ff"
self.generateblock(self.nodes[0], output=f"raw({opreturn}{nulldata})", transactions=[])
block_count = self.nodes[0].getblockcount()
self.stop_node(0)
assert (self.nodes[0].chain_path / "blocks" / "blk00000.dat").exists()
assert (self.nodes[0].chain_path / "blocks" / "blk00001.dat").exists()
self.log.debug("Make the first block file read-only")
filename = self.nodes[0].chain_path / "blocks" / "blk00000.dat"
filename.chmod(stat.S_IREAD)
undo_immutable = lambda: None
# Linux
try:
subprocess.run(['chattr'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
try:
subprocess.run(['chattr', '+i', filename], capture_output=True, check=True)
undo_immutable = lambda: subprocess.check_call(['chattr', '-i', filename])
self.log.info("Made file immutable with chattr")
except subprocess.CalledProcessError as e:
self.log.warning(str(e))
if e.stdout:
self.log.warning(f"stdout: {e.stdout}")
if e.stderr:
self.log.warning(f"stderr: {e.stderr}")
if os.getuid() == 0:
self.log.warning("Return early on Linux under root, because chattr failed.")
self.log.warning("This should only happen due to missing capabilities in a container.")
self.log.warning("Make sure to --cap-add LINUX_IMMUTABLE if you want to run this test.")
undo_immutable = False
except Exception:
# macOS, and *BSD
try:
subprocess.run(['chflags'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
try:
subprocess.run(['chflags', 'uchg', filename], capture_output=True, check=True)
undo_immutable = lambda: subprocess.check_call(['chflags', 'nouchg', filename])
self.log.info("Made file immutable with chflags")
except subprocess.CalledProcessError as e:
self.log.warning(str(e))
if e.stdout:
self.log.warning(f"stdout: {e.stdout}")
if e.stderr:
self.log.warning(f"stderr: {e.stderr}")
if os.getuid() == 0:
self.log.warning("Return early on BSD under root, because chflags failed.")
undo_immutable = False
except Exception:
pass
if undo_immutable:
self.log.debug("Attempt to restart and reindex the node with the unwritable block file")
with self.nodes[0].assert_debug_log(["Reindexing finished"], timeout=60):
self.start_node(0, extra_args=['-reindex', '-fastprune'])
assert block_count == self.nodes[0].getblockcount()
undo_immutable()
filename.chmod(0o777)
def run_test(self):
self.reindex_readonly()
if __name__ == '__main__':
BlockstoreReindexTest(__file__).main()
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