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gossipd: truncate gossip_store.tmp for compaction. 

If something went wrong and there was an old one, we were
appending to it!

Reported-by: @SimonVrouwe
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-06-20 10:21:12 +09:30
parent 92bd3a3587
commit 47b5f2e837
2 changed files with 15 additions and 1 deletions
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2
gossipd/gossip_store.c
View File

@ -235,7 +235,7 @@ bool gossip_store_compact(struct gossip_store *gs)
"Compacting gossip_store with %zu entries, %zu of which are stale",
gs->count, gs->deleted);
fd = open(GOSSIP_STORE_TEMP_FILENAME, O_RDWR|O_APPEND|O_CREAT, 0600);
fd = open(GOSSIP_STORE_TEMP_FILENAME, O_RDWR|O_TRUNC|O_CREAT, 0600);
if (fd < 0) {
status_broken(

14
tests/test_gossip.py
View File

@ -1198,6 +1198,20 @@ def setup_gossip_store_test(node_factory, bitcoind):
return l2
@unittest.skipIf(not DEVELOPER, "need dev-compact-gossip-store")
def test_gossip_store_compact_noappend(node_factory, bitcoind):
l2 = setup_gossip_store_test(node_factory, bitcoind)
# It should truncate this, not leave junk!
with open(os.path.join(l2.daemon.lightning_dir, 'gossip_store.tmp'), 'wb') as f:
f.write(bytearray.fromhex("07deadbeef"))
l2.rpc.call('dev-compact-gossip-store')
l2.restart()
wait_for(lambda: l2.daemon.is_in_log('gossip_store: Read '))
assert not l2.daemon.is_in_log('gossip_store:.*truncate')
def test_gossip_store_load_complex(node_factory, bitcoind):
l2 = setup_gossip_store_test(node_factory, bitcoind)