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p2p: Avoid InitError when downgrading peers.dat

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fixes #24188
When downgrading, a peers.dat with a future version that has a minimum
required version larger than the downgraded version would cause an InitError.

This commit changes this behavior to overwrite the existing peers.dat with
a new empty one, while creating a backup in peers.dat.bak.
This commit is contained in:
junderw
2022-01-29 21:58:59 +09:00
parent 5b4b8f76f3
commit d41ed32153
4 changed files with 24 additions and 10 deletions
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17
test/functional/feature_addrman.py
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@@ -68,17 +68,16 @@ class AddrmanTest(BitcoinTestFramework):
self.start_node(0, extra_args=["-checkaddrman=1"])
assert_equal(self.nodes[0].getnodeaddresses(), [])
self.log.info("Check that addrman from future cannot be read")
self.log.info("Check that addrman from future is overwritten with new addrman")
self.stop_node(0)
write_addrman(peers_dat, lowest_compatible=111)
self.nodes[0].assert_start_raises_init_error(
expected_msg=init_error(
"Unsupported format of addrman database: 1. It is compatible with "
"formats >=111, but the maximum supported by this version of "
f"{self.config['environment']['PACKAGE_NAME']} is 4.: (.+)"
),
match=ErrorMatch.FULL_REGEX,
)
assert_equal(os.path.exists(peers_dat + ".bak"), False)
with self.nodes[0].assert_debug_log([
f'Creating new peers.dat because the file version was not compatible ("{peers_dat}"). Original backed up to peers.dat.bak',
]):
self.start_node(0)
assert_equal(self.nodes[0].getnodeaddresses(), [])
assert_equal(os.path.exists(peers_dat + ".bak"), True)
self.log.info("Check that corrupt addrman cannot be read (EOF)")
self.stop_node(0)