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2017-11-16scripted-diff: Replace #include "" with #include <> (ryanofsky)MeshCollider
-BEGIN VERIFY SCRIPT- for f in \ src/*.cpp \ src/*.h \ src/bench/*.cpp \ src/bench/*.h \ src/compat/*.cpp \ src/compat/*.h \ src/consensus/*.cpp \ src/consensus/*.h \ src/crypto/*.cpp \ src/crypto/*.h \ src/crypto/ctaes/*.h \ src/policy/*.cpp \ src/policy/*.h \ src/primitives/*.cpp \ src/primitives/*.h \ src/qt/*.cpp \ src/qt/*.h \ src/qt/test/*.cpp \ src/qt/test/*.h \ src/rpc/*.cpp \ src/rpc/*.h \ src/script/*.cpp \ src/script/*.h \ src/support/*.cpp \ src/support/*.h \ src/support/allocators/*.h \ src/test/*.cpp \ src/test/*.h \ src/wallet/*.cpp \ src/wallet/*.h \ src/wallet/test/*.cpp \ src/wallet/test/*.h \ src/zmq/*.cpp \ src/zmq/*.h do base=${f%/*}/ relbase=${base#src/} sed -i "s:#include \"\(.*\)\"\(.*\):if test -e \$base'\\1'; then echo \"#include <\"\$relbase\"\\1>\\2\"; else echo \"#include <\\1>\\2\"; fi:e" $f done -END VERIFY SCRIPT-
2017-11-15Merge #10600: Make feebumper class statelessMarcoFalke
aed1d90ac [wallet] Change feebumper from class to functions (Russell Yanofsky) 37bdcca3c [refactor] Make feebumper namespace (Russell Yanofsky) 7c4f00919 [trivial] Rename feebumper variables according to project code style (Russell Yanofsky) Pull request description: Make feebumper methods static and remove stored state in the class. Having the results of feebumper calls persist in an object makes process separation between Qt and wallet awkward, because it means the feebumper object either has to be serialized back and forth between Qt and wallet processes between fee bump calls, or that the feebumper object needs to stay alive in the wallet process with an object reference passed back to Qt. It's simpler just to have fee bumper calls return their results immediately instead of storing them in an object with an extended lifetime. In addition to making feebumper methods static, also: - Move LOCK calls from Qt code to feebumper - Move TransactionCanBeBumped implementation from Qt code to feebumper - Rename CFeeBumper class to FeeBumper (every CFeeBumper reference had to be updated in this PR anyway so this doesn't increase the size of the diff) This change was originally part of https://github.com/bitcoin/bitcoin/pull/10244 Tree-SHA512: bf75e0c741b4e9c8912e66cc1dedf0ff715f77ea65fc33f7020d97d9099b0f6448f5852236dac63eea649de7d6fc03b0b21492e2c5140fb7560a39cf085506fd
2017-11-15Merge #10286: Call wallet notify callbacks in scheduler thread (without cs_main)Wladimir J. van der Laan
89f0312 Remove redundant pwallet nullptr check (Matt Corallo) c4784b5 Add a dev notes document describing the new wallet RPC blocking (Matt Corallo) 3ea8b75 Give ZMQ consistent order with UpdatedBlockTip on scheduler thread (Matt Corallo) cb06edf Fix wallet RPC race by waiting for callbacks in sendrawtransaction (Matt Corallo) e545ded Also call other wallet notify callbacks in scheduler thread (Matt Corallo) 17220d6 Use callbacks to cache whether wallet transactions are in mempool (Matt Corallo) 5d67a78 Add calls to CWallet::BlockUntilSyncedToCurrentChain() in RPCs (Matt Corallo) 5ee3172 Add CWallet::BlockUntilSyncedToCurrentChain() (Matt Corallo) 0b2f42d Add CallFunctionInQueue to wait on validation interface queue drain (Matt Corallo) 2b4b345 Add ability to assert a lock is not held in DEBUG_LOCKORDER (Matt Corallo) 0343676 Call TransactionRemovedFromMempool in the CScheduler thread (Matt Corallo) a7d3936 Add a CValidationInterface::TransactionRemovedFromMempool (Matt Corallo) Pull request description: Based on #10179, this effectively reverts #9583, regaining most of the original speedups of #7946. This concludes the work of #9725, #10178, and #10179. See individual commit messages for more information. Tree-SHA512: eead4809b0a75d1fb33b0765174ff52c972e45040635e38cf3686cef310859c1e6b3c00e7186cbd17374c6ae547bfbd6c1718fe36f26c76ba8a8b052d6ed7bc9
2017-11-10[wallet] Change feebumper from class to functionsRussell Yanofsky
Change feebumper from a stateful class into a namespace of stateless functions. Having the results of feebumper calls persist in an object makes process separation between Qt and wallet awkward, because it means the feebumper object either has to be serialized back and forth between Qt and wallet processes between fee bump calls, or that the feebumper object needs to stay alive in the wallet process with an object reference passed back to Qt. It's simpler just to have fee bumper calls return their results immediately instead of storing them in an object with an extended lifetime. In addition to making feebumper stateless, also: - Move LOCK calls from Qt code to feebumper - Move TransactionCanBeBumped implementation from Qt code to feebumper
2017-11-10[refactor] Make feebumper namespaceRussell Yanofsky
Future commit will remove the FeeBumper class. This commit simply places everything into a feebumper namespace, and changes the enum class name from BumpeFeeResult to feebumper::Result.
2017-11-10[trivial] Rename feebumper variables according to project code styleRussell Yanofsky
Future PRs will completely refactor this translation unit and touch all this code so we rename the variables to follow project stlye guidelines in this preparation commit. Don't use m_ prefixes for member variables since we're going to remove the class entirely in the next commits.
2017-11-10[wallet] getreceivedbyaddress should return error if address is not mineJohn Newbery
2017-11-10tests: Add missing locks to testspracticalswift
Add missing locks to tests to satisfy lock requirements (such as EXCLUSIVE_LOCKS_REQUIRED(...) (Clang Thread Safety Analysis), AssertLockHeld(...) and implicit lock assumptions).
2017-11-09Merge #11043: Use std::unique_ptr (C++11) where possibleWladimir J. van der Laan
a357293 Use MakeUnique<Db>(...) (practicalswift) 3e09b39 Use MakeUnique<T>(...) instead of std::unique_ptr<T>(new T(...)) (practicalswift) 8617989 Add MakeUnique (substitute for C++14 std::make_unique) (practicalswift) d223bc9 Use unique_ptr for pcoinscatcher/pcoinsdbview/pcoinsTip/pblocktree (practicalswift) b45c597 Use unique_ptr for pdbCopy (Db) and fix potential memory leak (practicalswift) 29ab96d Use unique_ptr for dbenv (DbEnv) (practicalswift) f72cbf9 Use unique_ptr for pfilter (CBloomFilter) (practicalswift) 8ccf1bb Use unique_ptr for sem{Addnode,Outbound} (CSemaphore) (practicalswift) 73db063 Use unique_ptr for upnp_thread (boost::thread) (practicalswift) 0024531 Use unique_ptr for dbw (CDBWrapper) (practicalswift) fa6d122 Use unique_ptr:s for {fee,short,long}Stats (TxConfirmStats) (practicalswift) 5a6f768 Use unique_ptr for httpRPCTimerInterface (HTTPRPCTimerInterface) (practicalswift) 860e912 Use unique_ptr for pwalletMain (CWallet) (practicalswift) Pull request description: Use `std::unique_ptr` (C++11) where possible. Rationale: 1. Avoid resource leaks (specifically: forgetting to `delete` an object created using `new`) 2. Avoid undefined behaviour (specifically: double `delete`:s) **Note to reviewers:** Please let me know if I've missed any obvious `std::unique_ptr` candidates. Hopefully this PR should cover all the trivial cases. Tree-SHA512: 9fbeb47b800ab8ff4e0be9f2a22ab63c23d5c613a0c6716d9183db8d22ddbbce592fb8384a8b7874bf7375c8161efb13ca2197ad6f24b75967148037f0f7b20c
2017-11-09Merge #11272: CKeystore/CCrypter: move relevant implementation out of the headerWladimir J. van der Laan
dd9bb25 Fix code style in keystore.cpp/crypter.cpp (Jonas Schnelli) 208fda6 CCrypter: move relevant implementation out of the header (Jonas Schnelli) 3155fd2 CKeystore: move relevant implementation out of the header (Jonas Schnelli) Pull request description: Tree-SHA512: 4ce73cca5609199b74b8ff2614ee2b6af949545a1332a3a0135c6453c98665d2b0da171c1e390c9a2aec6b12b7fad931ec90084bb7c2defe243786bfc70daf60
2017-11-09Use MakeUnique<Db>(...)practicalswift
2017-11-09Use MakeUnique<T>(...) instead of std::unique_ptr<T>(new T(...))practicalswift
2017-11-09Use unique_ptr for pdbCopy (Db) and fix potential memory leakpracticalswift
2017-11-09Use unique_ptr for dbenv (DbEnv)practicalswift
2017-11-09Use unique_ptr for pwalletMain (CWallet)practicalswift
2017-11-09Merge #11074: Assert that CWallet::SyncMetaData finds oldest transaction.Wladimir J. van der Laan
6c4042a Assert that CWallet::SyncMetaData finds oldest transaction. (Eelis) Pull request description: Without this assert, the Clang static analyzer warns about subsequent dereferencing of copyFrom, because it can't be sure that it's not nullptr. See #9573. Tree-SHA512: 83cbcb32c52c94fcfefbc90ec7de2011dacd6bdb0da35adc401b8d8dda6a86de2fa0403e2158592268c2cf15eef4f3d887d98c90f1031d4735d5f4bf9dbc1d23
2017-11-09Merge #10368: [wallet] Remove helper conversion operator from walletWladimir J. van der Laan
5a5e4e9 [wallet] Remove CTransaction&() helper conversion operator from wallet implementation. (Karl-Johan Alm) Pull request description: The `CTransaction&()` operator in `CMerkleTx` makes conversion into `CTransaction`s transparent, but was marked as to-be-removed in favor of explicitly getting the `tx` ivar, presumably as the operator can lead to ambiguous behavior and makes the code harder to follow. This PR removes the operator and adapts callers. This includes some cases of `static_cast<CTransaction>(wtx)` → `*wtx.tx`, which is definitely an improvement. Tree-SHA512: 95856fec7194d6a79615ea1c322abfcd6bcedf6ffd0cfa89bbdd332ce13035fa52dd4b828d20df673072dde1be64b79c513529a6f422dd5f0961ce722a32d56a
2017-11-09Merge #11594: Improve -disablewallet parameter interactionWladimir J. van der Laan
7963335 Fix -disablewallet default value (João Barbosa) b411c2a Improve -disablewallet parameter interaction (João Barbosa) Pull request description: The first commit logs a message for each configured wallet if `-disablewallet` is set: ``` bitcoind -printtoconsole -regtest -disablewallet -wallet=foo -wallet=bar ... WalletParameterInteraction: parameter interaction: -disablewallet -> ignoring -wallet=foo WalletParameterInteraction: parameter interaction: -disablewallet -> ignoring -wallet=bar ``` It also moves up the `-disablewallet` check which avoids the unnecessary `-wallet` soft set. The second commit fixes the default value of `-disablewallet`, currently the value is correct, but it should use `DEFAULT_DISABLE_WALLET`. The third commit can be dropped or squashed, just took the opportunity to fix the coding style there. Tree-SHA512: bec13d2b2be5adf4680c77212020ed27dd05f15c4c73542d2005d91108bf704e2df1707ed2bec696e584ecd40eff7a63e25201fd70400222aa5a8da6aed6afeb
2017-11-08Merge #11289: Add wallet backup text to import* and add* RPCsWladimir J. van der Laan
c098c58 Wrap dumpwallet warning and note scripts aren't dumped (MeshCollider) a38bfbc Add wallet backup text to import*, add* and dumpwallet RPCs (MeshCollider) Pull request description: Closes https://github.com/bitcoin/bitcoin/issues/11243 Adds "Requires a new wallet backup" text to `addwitnessaddress`, `importprivkey`, `importmulti`, `importaddress`, `importpubkey`, and `addmultisigaddress`. Also adds a warning to `dumpwallet` that backing up the seed alone is not sufficient to back up non-HD addresses Tree-SHA512: 76d7cdca54d5b458acf479154620322391b889922525fddd6153f4164cfee393ad743757400cb8f6b1b30f24947df68ea9043b4e509f7df77a8fa05dda370933
2017-11-07Fix -disablewallet default valueJoão Barbosa
2017-11-07Improve -disablewallet parameter interactionJoão Barbosa
2017-11-03[trivial] Fix error messages in CFeeBumperKarl-Johan Alm
2017-11-02Merge #11590: [Wallet] always show help-line of wallet encryption callsMarcoFalke
720d9e8fa [Wallet] always show help-line of wallet encryption calls (Jonas Schnelli) Pull request description: We do currently show/hide the wallet encryption RPC calls from the help if the current wallet. In case of an encrypted wallet, `encryptwallet` is hidden and `walletpassphrasechange`, `walletpassphrasechange` and `walletlock` do appear in the help. This is no longer ideal in case of multiwallet due to the fact that one may want help infos in order to target a specific wallet. IMO its preferable to have a static help screen (show everything always). The currently show/hidden calls do handle the possible invalid encryption-state fine. Fixes #11588 Tree-SHA512: 513fecd15248a31361f5143685e8cdeb63dfd3fa7120828917e1db54d936dc3db60d48ce46efa5c3a563a48157fe962689879856eeeed53f904686b12aec204e
2017-11-01Merge #11376: Ensure backupwallet fails when attempting to backup to source fileMarcoFalke
5d465e396 Ensure backupwallet fails when attempting to backup to source file (Tomas van der Wansem) Pull request description: Previous behaviour was to destroy the wallet (to zero-length) This fixes #11375 Tree-SHA512: bfd1738659b15e3f23b6bbdf55ec12269c62c820bf701daec19500b52bd5845bb5516733c6f76f36197eb155182a8a35dc239ad4de2ef1e59bbb0f124a455759
2017-10-31[Wallet] always show help-line of wallet encryption callsJonas Schnelli
2017-10-26Make listsinceblock refuse unknown block hashRussell Yanofsky
Change suggested by Cory Fields <cory-nospam-@coryfields.com> who noticed listsinceblock would ignore invalid block hashes causing it to return a completely unfiltered list of transactions.
2017-10-19Avoid opening copied wallet databases simultaneouslyRussell Yanofsky
Make sure wallet databases have unique fileids. If they don't, throw an error. BDB caches do not work properly when more than one open database has the same fileid, because values written to one database may show up in reads to other databases. Bitcoin will never create different databases with the same fileid, but users can create them by manually copying database files. BDB caching bug was reported by Chris Moore <dooglus@gmail.com> https://github.com/bitcoin/bitcoin/issues/11429 Fixes #11429
2017-10-19Wrap dumpwallet warning and note scripts aren't dumpedMeshCollider
2017-10-18Merge #11467: Fix typos. Use nullptr instead of NULL.Wladimir J. van der Laan
0aacfa4 Remove accidental stray semicolon (practicalswift) 68feb49 Use nullptr instead of NULL (practicalswift) c6b07fd Fix a vs. an typo (practicalswift) Pull request description: Minor cleanups: * Typo: Fix a vs. an typo * Typo: Remove accidental stray semicolon (only remaining instance in repo) * Correctness/consistency: Use `nullptr` instead of `NULL` (only remaining instance in repo) Tree-SHA512: 47142e557da9d3fa0b532c46edeb7f356a1f6dc5973e60b0e496badff3581ff696eade542d49da777ac7f2e895129cc8487ccdb1984ff828434fa86f9a56dad0
2017-10-18Merge #11492: [wallet] Fix leak in CDB constructorWladimir J. van der Laan
7104de8 [wallet] Fix leak in CDB constructor (João Barbosa) Pull request description: First commit fixes a minor leak. Second commit improves the constructor in the failure cases. Tree-SHA512: 5165413d60ed9fc28203c9fe128adbba03a9ea9e9aa3734d9ea2522dafd815ba0fb8b90fd0809dbc06eb3ad360e7764de01dadf653ade3350fe86f6b8f04bc90
2017-10-17Merge #11483: Fix importmulti bug when importing an already imported keyMarcoFalke
a44a21517 Fix importmulti bug when importing an already imported key (Pedro Branco) Pull request description: This PR fixes a bug in `importmulti` RPC call where it returns an invalid response when importing an already imported key. Before: ```sh ❯ bitcoin-cli -regtest importmulti '[{ "keys": ["cNcMUunXhVK1dXJ5riixtpYSxPXZnUAMGS4vpzwChdKmYY3Rz99v"], "scriptPubKey": { "address": "n4YZAf4WE2XF3t4BfeYS2nHAhb8CVx91BR" }, "timestamp": 1507655239 }]' [{ "success": true }] ❯ bitcoin-cli -regtest importmulti '[{ "keys": ["cNcMUunXhVK1dXJ5riixtpYSxPXZnUAMGS4vpzwChdKmYY3Rz99v"], "scriptPubKey": { "address": "n4YZAf4WE2XF3t4BfeYS2nHAhb8CVx91BR" }, "timestamp": 1507655239 }]' '{ "rescan": false }' [ false ] ❯ bitcoin-cli -regtest importmulti '[{ "keys": ["cNcMUunXhVK1dXJ5riixtpYSxPXZnUAMGS4vpzwChdKmYY3Rz99v"], "scriptPubKey": { "address": "n4YZAf4WE2XF3t4BfeYS2nHAhb8CVx91BR" }, "timestamp": 1507655239 }]' '{ "rescan": true }' error code: -1 error message: JSON value is not a boolean as expected ``` After this fix: ```sh ❯ bitcoin-cli -rpcuser=u -rpcpassword=p -regtest importmulti '[{ "keys": ["cNcMUunXhVK1dXJ5riixtpYSxPXZnUAMGS4vpzwChdKmYY3Rz99v"], "scriptPubKey": { "address": "n4YZAf4WE2XF3t4BfeYS2nHAhb8CVx91BR" }, "timestamp": 1507655139 }]' [{ "success": true }] ❯ bitcoin-cli -rpcuser=u -rpcpassword=p -regtest importmulti '[{ "keys": ["cNcMUunXhVK1dXJ5riixtpYSxPXZnUAMGS4vpzwChdKmYY3Rz99v"], "scriptPubKey": { "address": "n4YZAf4WE2XF3t4BfeYS2nHAhb8CVx91BR" }, "timestamp": 1507655139 }]' [{ "success": false, "error": { "code": -4, "message": "The wallet already contains the private key for this address or script" } }] ``` Tree-SHA512: 4acebdfb7d0ebd7cd48e943b93ed1cec072db1ace5c42b3f5cc225603764b6e804e4b823b0710965826aafc2f0c615c53d5aefcfdb9bc9c379f5221b798a318c
2017-10-14[wallet] Fix leak in CDB constructorJoão Barbosa
Now using a std::unique_ptr, the Db instance is correctly released when CDB initialization fails. The internal CDB state and mapFileUseCount are only mutated when the CDB initialization succeeds.
2017-10-14Add wallet backup text to import*, add* and dumpwallet RPCsMeshCollider
2017-10-14Add missing comma from rescanblockchainMeshCollider
2017-10-13Remove redundant pwallet nullptr checkMatt Corallo
2017-10-13Use callbacks to cache whether wallet transactions are in mempoolMatt Corallo
This avoid calling out to mempool state during coin selection, balance calculation, etc. In the next commit we ensure all wallet callbacks from CValidationInterface happen in the same queue, serialized with each other. This helps to avoid re-introducing one of the issues described in #9584 [1] by further disconnecting wallet from current chain/mempool state. Thanks to @morcos for the suggestion to do this. Note that there are several race conditions introduced here: * If a user calls sendrawtransaction from RPC, adding a transaction which is "trusted" (ie from them) and pays them change, it may not be immediately used by coin selection until the notification callbacks finish running. No such race is introduced in normal transaction-sending RPCs as this case is explicitly handled. * Until Block{Connected,Disconnected} and TransactionAddedToMempool calls also run in the CSceduler background thread, there is a race where TransactionAddedToMempool might be called after a Block{Connected,Disconnected} call happens. * Wallet will write a new best chain from the SetBestChain callback prior to having processed the transaction from that block. [1] "you could go to select coins, need to use 0-conf change, but such 0-conf change may have been included in a block who's callbacks have not yet been processed - resulting in thinking they are not in mempool and, thus, not selectable."
2017-10-13Add calls to CWallet::BlockUntilSyncedToCurrentChain() in RPCsMatt Corallo
This prevents the wallet-RPCs-return-stale-info issue from being re-introduced when new-block callbacks no longer happen in the block-connection cs_main lock
2017-10-13Add CWallet::BlockUntilSyncedToCurrentChain()Matt Corallo
This blocks until the wallet has synced up to the current height.
2017-10-13Merge #7061: [Wallet] Add RPC call "rescanblockchain <startheight> <stopheight>"Jonas Schnelli
7a91ceb5e [QA] Add RPC based rescan test (Jonas Schnelli) c77170fbd [Wallet] add rescanblockchain <start_height> <stop_height> RPC command (Jonas Schnelli) Pull request description: A RPC rescan command is much more flexible for the following reasons: * You can define the start and end-height * It can be called during runtime * It can work in multiwallet environment Tree-SHA512: df67177bad6ad1d08e5a621f095564524fa3eb87204c2048ef7265e77013e4b1b29f991708f807002329a507a254f35e79a4ed28a2d18d4b3da7a75d57ce0ea5
2017-10-12[Wallet] add rescanblockchain <start_height> <stop_height> RPC commandJonas Schnelli
2017-10-12Merge #11133: Document assumptions that are being made to avoid division by zeroWladimir J. van der Laan
55509f1 Document assumptions that are being made to avoid division by zero (practicalswift) Pull request description: Document assumptions (via `assert(…)`:s) that are being made to avoid division by zero. Rationale: * Make it clear to human reviewers and non-human static analyzers that what might look like potential division by zero cases are written the way they are intentionally (these cases are currently flagged by various static analyzers). Tree-SHA512: bbb67b1370afd8f39bda35f9e3a20f4325f017d94cc1bfac3b0d36c9f34c2d95a9efe11efe44db29fb4aadd25d8276d8f0e03c8806ac64f0d21d821912e13b8e
2017-10-11Fix importmulti bug when importing an already imported keyPedro Branco
2017-10-10Ensure backupwallet fails when attempting to backup to source fileTomas van der Wansem
Previous behaviour was to destroy the wallet (to zero-length)
2017-10-09Use nullptr instead of NULLpracticalswift
2017-10-09Update importprivkey named args documentationDusty Williams
Fixes #11462. Updated documentation for importprivkey function to use the correct name for the first argument. Also updates a call to importprivkey to use named args in functional test.
2017-10-06Fix code style in keystore.cpp/crypter.cppJonas Schnelli
2017-10-05Merge #11107: Fix races in AppInitMain and others with lock and atomic boolsMarcoFalke
c626dcb50 Make fUseCrypto atomic (MeshCollider) 731065b11 Consistent parameter names in txdb.h (MeshCollider) 35aeabec6 Make fReindex atomic to avoid race (MeshCollider) 58d91af59 Fix race for mapBlockIndex in AppInitMain (MeshCollider) Pull request description: Fixes https://github.com/bitcoin/bitcoin/issues/11106 Also makes fReindex atomic as suggested in @TheBlueMatt comment below, and makes fUseCrypto atomic as suggested in 10916 https://github.com/bitcoin/bitcoin/pull/11107/commits/d291e7635b0ef4156c2805c6c4ee1adad91f0307 just renames the parameters in the txdb header file to make them consistent with those used in the cpp file, noticed it when looking for uses of fReindex Tree-SHA512: b378aa7289fd505b76565cd4d48dcdc04ac5540283ea1c80442170b0f13cb6df771b1a94dd54b7fec3478a7b4668c224ec9d795f16937782724c5d020edd3a42
2017-10-04CCrypter: move relevant implementation out of the headerJonas Schnelli
2017-10-04Merge #9937: rpc: Prevent `dumpwallet` from overwriting filesWladimir J. van der Laan
0cd9273 rpc: Prevent `dumpwallet` from overwriting files (Wladimir J. van der Laan) Pull request description: Prevent arbitrary files from being overwritten by `dumpwallet`. There have been reports that users have overwritten wallet files this way. It may also avoid other security issues. Fixes #9934. Adds mention to release notes and adds a test. Tree-SHA512: 268c98636d40924d793b55a685a0b419bafd834ad369edaec08227ebe26ed4470ddea73008d1c4beb10ea445db1b0bb8e3546ba8fc2d1a411ebd4a0de8ce9120
2017-10-04Merge #10939: [init] Check non-emptiness of -blocknotify command prior to ↵Wladimir J. van der Laan
executing cffe85f Skip sys::system(...) call in case of empty command (practicalswift) 6fb8f5f Check that -blocknotify command is non-empty before executing (practicalswift) Pull request description: Check that `-blocknotify` command is non-empty before executing. To make the `BlockNotifyCallback(...)` (`-blocknotify`) behaviour consistent with that of: * `AlertNotify(...)` (`-alertnotify`) * `AddToWallet(...)` (`-walletnotify`) Tree-SHA512: 18272166793a5a8b9cc2a727bfbcea53d38c329a55bc975c02db601329d608a61c20e026ce4b616193ecd3810dca4d3e2cb3bf773898a51872008a8dba96763e
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