Merge bitcoin/bitcoin#26196: kernel: move RunCommandParseJSON to its own file

43b8777dc3e63f4a1b20a3cb23e44c1b9e32862b refactor: move run_command from util to common (Cory Fields)
192325a77d593e404e74ef5e204aed8801b4e66f kernel: move RunCommandParseJSON to its own file (Cory Fields)

Pull request description:

  Because libbitcoinkernel does not include this new object, this has the side-effect of eliminating its unnecessary `boost::process` dependency.

  This leaves libbitcoinkernel with 3 remaining boost dependencies:
  - `boost::date_time` for `util/time.cpp`, which I'll separate out next. Exactly like this PR.
  - `boost::signals2` for which I have a POC re-implementation here: https://github.com/theuni/bitcoin/commits/replace-boost-signals
  - `boost::multi_index` which I'm not sure about yet.

ACKs for top commit:
  ryanofsky:
    Code review ACK 43b8777dc3e63f4a1b20a3cb23e44c1b9e32862b. Could consider squashing the two commits, so the code just moves once instead of twice.
  fanquake:
    ACK 43b8777dc3e63f4a1b20a3cb23e44c1b9e32862b

Tree-SHA512: f2a46cac34aaadfb8a1442316152ad354f6990021b82c78d80cae9fd43cd026209ffd62132eaa99d5d0f8cf34e996b6737d318a9d9a3f1d2ff8d17d697abf26d

7 files changed, 90 insertions, 62 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index bc1c6a0d0f..caeaee511f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -133,6 +133,7 @@ BITCOIN_CORE_H = \
   clientversion.h \
   coins.h \
   common/bloom.h \
+  common/run_command.h \
   compat/assumptions.h \
   compat/byteswap.h \
   compat/compat.h \
@@ -616,7 +617,7 @@ libbitcoin_consensus_a_SOURCES = \
   version.h
 
 # common: shared between bitcoind, and bitcoin-qt and non-server tools
-libbitcoin_common_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+libbitcoin_common_a_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BOOST_CPPFLAGS)
 libbitcoin_common_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 libbitcoin_common_a_SOURCES = \
   base58.cpp \
@@ -624,6 +625,7 @@ libbitcoin_common_a_SOURCES = \
   chainparams.cpp \
   coins.cpp \
   common/bloom.cpp \
+  common/run_command.cpp \
   compressor.cpp \
   core_read.cpp \
   core_write.cpp \
diff --git a/src/common/run_command.cpp b/src/common/run_command.cpp
new file mode 100644
index 0000000000..6ad9f75b5d
--- /dev/null
+++ b/src/common/run_command.cpp
@@ -0,0 +1,64 @@
+// Copyright (c) 2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
+#include <common/run_command.h>
+
+#include <tinyformat.h>
+#include <univalue.h>
+
+#ifdef ENABLE_EXTERNAL_SIGNER
+#if defined(__GNUC__)
+// Boost 1.78 requires the following workaround.
+// See: https://github.com/boostorg/process/issues/235
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnarrowing"
+#endif
+#include <boost/process.hpp>
+#if defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
+#endif // ENABLE_EXTERNAL_SIGNER
+
+UniValue RunCommandParseJSON(const std::string& str_command, const std::string& str_std_in)
+{
+#ifdef ENABLE_EXTERNAL_SIGNER
+    namespace bp = boost::process;
+
+    UniValue result_json;
+    bp::opstream stdin_stream;
+    bp::ipstream stdout_stream;
+    bp::ipstream stderr_stream;
+
+    if (str_command.empty()) return UniValue::VNULL;
+
+    bp::child c(
+        str_command,
+        bp::std_out > stdout_stream,
+        bp::std_err > stderr_stream,
+        bp::std_in < stdin_stream
+    );
+    if (!str_std_in.empty()) {
+        stdin_stream << str_std_in << std::endl;
+    }
+    stdin_stream.pipe().close();
+
+    std::string result;
+    std::string error;
+    std::getline(stdout_stream, result);
+    std::getline(stderr_stream, error);
+
+    c.wait();
+    const int n_error = c.exit_code();
+    if (n_error) throw std::runtime_error(strprintf("RunCommandParseJSON error: process(%s) returned %d: %s\n", str_command, n_error, error));
+    if (!result_json.read(result)) throw std::runtime_error("Unable to parse JSON: " + result);
+
+    return result_json;
+#else
+    throw std::runtime_error("Compiled without external signing support (required for external signing).");
+#endif // ENABLE_EXTERNAL_SIGNER
+}
diff --git a/src/common/run_command.h b/src/common/run_command.h
new file mode 100644
index 0000000000..2fbdc071ee
--- /dev/null
+++ b/src/common/run_command.h
@@ -0,0 +1,21 @@
+// Copyright (c) 2022 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_COMMON_RUN_COMMAND_H
+#define BITCOIN_COMMON_RUN_COMMAND_H
+
+#include <string>
+
+class UniValue;
+
+/**
+ * Execute a command which returns JSON, and parse the result.
+ *
+ * @param str_command The command to execute, including any arguments
+ * @param str_std_in string to pass to stdin
+ * @return parsed JSON
+ */
+UniValue RunCommandParseJSON(const std::string& str_command, const std::string& str_std_in="");
+
+#endif // BITCOIN_COMMON_RUN_COMMAND_H
diff --git a/src/external_signer.cpp b/src/external_signer.cpp
index 094314e878..0e582629f7 100644
--- a/src/external_signer.cpp
+++ b/src/external_signer.cpp
@@ -3,10 +3,10 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <chainparams.h>
+#include <common/run_command.h>
 #include <core_io.h>
 #include <psbt.h>
 #include <util/strencodings.h>
-#include <util/system.h>
 #include <external_signer.h>
 
 #include <algorithm>
diff --git a/src/test/system_tests.cpp b/src/test/system_tests.cpp
index f160bb08a5..11f4be7fef 100644
--- a/src/test/system_tests.cpp
+++ b/src/test/system_tests.cpp
@@ -3,7 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 //
 #include <test/util/setup_common.h>
-#include <util/system.h>
+#include <common/run_command.h>
 #include <univalue.h>
 
 #ifdef ENABLE_EXTERNAL_SIGNER
diff --git a/src/util/system.cpp b/src/util/system.cpp
index c3c6cbfef6..ce5d846eb9 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -5,19 +5,6 @@
 
 #include <util/system.h>
 
-#ifdef ENABLE_EXTERNAL_SIGNER
-#if defined(__GNUC__)
-// Boost 1.78 requires the following workaround.
-// See: https://github.com/boostorg/process/issues/235
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wnarrowing"
-#endif
-#include <boost/process.hpp>
-#if defined(__GNUC__)
-#pragma GCC diagnostic pop
-#endif
-#endif // ENABLE_EXTERNAL_SIGNER
-
 #include <chainparamsbase.h>
 #include <fs.h>
 #include <sync.h>
@@ -1332,44 +1319,6 @@ void runCommand(const std::string& strCommand)
 }
 #endif
 
-UniValue RunCommandParseJSON(const std::string& str_command, const std::string& str_std_in)
-{
-#ifdef ENABLE_EXTERNAL_SIGNER
-    namespace bp = boost::process;
-
-    UniValue result_json;
-    bp::opstream stdin_stream;
-    bp::ipstream stdout_stream;
-    bp::ipstream stderr_stream;
-
-    if (str_command.empty()) return UniValue::VNULL;
-
-    bp::child c(
-        str_command,
-        bp::std_out > stdout_stream,
-        bp::std_err > stderr_stream,
-        bp::std_in < stdin_stream
-    );
-    if (!str_std_in.empty()) {
-        stdin_stream << str_std_in << std::endl;
-    }
-    stdin_stream.pipe().close();
-
-    std::string result;
-    std::string error;
-    std::getline(stdout_stream, result);
-    std::getline(stderr_stream, error);
-
-    c.wait();
-    const int n_error = c.exit_code();
-    if (n_error) throw std::runtime_error(strprintf("RunCommandParseJSON error: process(%s) returned %d: %s\n", str_command, n_error, error));
-    if (!result_json.read(result)) throw std::runtime_error("Unable to parse JSON: " + result);
-
-    return result_json;
-#else
-    throw std::runtime_error("Compiled without external signing support (required for external signing).");
-#endif // ENABLE_EXTERNAL_SIGNER
-}
 
 void SetupEnvironment()
 {
diff --git a/src/util/system.h b/src/util/system.h
index c8e1de6700..29629e547e 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -107,14 +107,6 @@ std::string ShellEscape(const std::string& arg);
 #if HAVE_SYSTEM
 void runCommand(const std::string& strCommand);
 #endif
-/**
- * Execute a command which returns JSON, and parse the result.
- *
- * @param str_command The command to execute, including any arguments
- * @param str_std_in string to pass to stdin
- * @return parsed JSON
- */
-UniValue RunCommandParseJSON(const std::string& str_command, const std::string& str_std_in="");
 
 /**
  * Most paths passed as configuration arguments are treated as relative to