Deterministic daemons: CLN_DEV_SET_TIME and CLN_DEV_ENTROPY_SEED#8556

Merged

rustyrussell merged 12 commits intoElementsProject:masterfrom

rustyrussell:deterministic-daemons

Nov 13, 2025

Commits on Nov 13, 2025

common: add randbytes() wrapper to override cryptographic entropy: $CLN_DEV_ENTROPY_SEED
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global: replace randombytes_buf() with randbytes() wrapper.
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pseudorand: make the results in deterministic mode per-caller.
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gossipd: remove --dev-gossip-time setting, we'll use CLN_DEV_SET_TIME.
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connectd, gossipd, pay, bcli: use timemono when solely measuring duration for timeouts.
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common/clock_time: wrapper for time_now() so we can override it.
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global: use clock_time in place of time_now().
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lightningd: introduce some changes for dual open id randomness even with CLN_DEV_ENTROPY_SEED.
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wallet: make utxo order deterministic if CLN_DEV_ENTROPY_SEED set.
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topology: in deterministic mode, only return one best candidate for listincoming.
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lightningd: add --dev-ignore-idb to not complain about bitcoind in initialblockdownload.
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pyln-testing: introduce canned blocks support to bitcoind fixture.
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