wallet: load flags before everything else #21127
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sidhujag
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Feb 13, 2021
9305862 wallet: load flags before everything else (Sjors Provoost) Pull request description: Load and set wallet flags before processing other records. That way we can take them into account while processing those other records. Suggested here: bitcoin#16546 (comment) ACKs for top commit: laanwj: Code review ACK 9305862 gruve-p: ACK bitcoin@9305862 achow101: ACK 9305862 Tree-SHA512: 7104523e369ce3c670571fe5e8b52c67b9ca92b8e36a2da5eb6f9f8bf8ed0544897007257204b68f6f371d682b3ef0d0635d36e6e8416ac74af1999d9fbc869c
laanwj
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Feb 23, 2021
f75e0c1 doc: add external-signer.md (Sjors Provoost) d4b0107 rpc: send: support external signer (Sjors Provoost) 245b445 rpc: signerdisplayaddress (Sjors Provoost) 7ebc7c0 wallet: ExternalSigner: add GetDescriptors method (Sjors Provoost) fc5da52 wallet: add GetExternalSigner() (Sjors Provoost) 259f52c test: external_signer wallet flag is immutable (Sjors Provoost) 2655197 rpc: add external_signer option to createwallet (Sjors Provoost) 2700f09 rpc: signer: add enumeratesigners to list external signers (Sjors Provoost) 07b7c94 rpc: add external signer RPC files (Sjors Provoost) 8ce7767 wallet: add ExternalSignerScriptPubKeyMan (Sjors Provoost) 157ea7c wallet: add external_signer flag (Sjors Provoost) f3e6ce7 test: add external signer test (Sjors Provoost) 8cf543f wallet: add -signer argument for external signer command (Sjors Provoost) f7eb7ec test: framework: add skip_if_no_external_signer (Sjors Provoost) 87a9794 configure: add --enable-external-signer (Sjors Provoost) Pull request description: Big picture overview in [this gist](https://gist.github.com/Sjors/29d06728c685e6182828c1ce9b74483d). This PR lets `bitcoind` call an arbitrary command `-signer=<cmd>`, e.g. a hardware wallet driver, where it can fetch public keys, ask to display an address, and sign a transaction (using PSBT under the hood). It's design to work with https://github.com/bitcoin-core/HWI, which supports multiple hardware wallets. Any command with the same arguments and return values will work. It simplifies the manual procedure described [here](https://github.com/bitcoin-core/HWI/blob/master/docs/bitcoin-core-usage.md). Usage is documented in [doc/external-signer.md]( https://github.com/Sjors/bitcoin/blob/2019/08/hww-box2/doc/external-signer.md), which also describes what protocol a different signer binary should conform to. Use `--enable-external-signer` to opt in, requires Boost::Process: ``` Options used to compile and link: with wallet = yes with gui / qt = no external signer = yes ``` It adds the following RPC methods: * `enumeratesigners`: asks <cmd> for a list of signers (e.g. devices) and their master key fingerprint * `signerdisplayaddress <address>`: asks <cmd> to display an address It enhances the following RPC methods: * `createwallet`: takes an additional `external_signer` argument and fetches keys from device * `send`: automatically sends transaction to device and waits Usage TL&DR: * clone HWI repo somewhere and launch `bitcoind -signer=../HWI/hwi.py` * check if you can see your hardware device: `bitcoin-cli enumeratesigners` * create wallet and auto import keys `bitcoin-cli createwallet "hww" true true "" true true true` * display address on device: `bitcoin-cli signerdisplayaddress ...` * to spend, use `send` RPC and approve transaction on device Prerequisites: - [x] #21127 load wallet flags before everything else - [x] #21182 remove mostly pointless BOOST_PROCESS macro Potentially useful followups: - GUI support: bitcoin-core/gui#4 - bumpfee support - (automatically) verify (a subset of) keys on the device after import, through message signing ACKs for top commit: laanwj: re-ACK f75e0c1 Tree-SHA512: 7db8afd54762295c1424c3f01d8c587ec256a72f34bd5256e04b21832dabd5dc212be8ab975ae3b67de75259fd569a561491945750492f417111dc7b6641e77f
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Load and set wallet flags before processing other records. That way we can take them into account while processing those other records.
Suggested here:
#16546 (comment)