external_signer: replace boost::process with cpp-subprocess

This primarily affects the `RunCommandParseJSON` utility function.

1 files changed, 10 insertions, 15 deletions

diff --git a/src/common/run_command.cpp b/src/common/run_command.cpp
index 8bd5febd53..e5356490ef 100644
--- a/src/common/run_command.cpp
+++ b/src/common/run_command.cpp
@@ -12,39 +12,34 @@
 #include <univalue.h>
 
 #ifdef ENABLE_EXTERNAL_SIGNER
-#include <boost/process.hpp>
+#include <util/subprocess.hpp>
 #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;
+    namespace sp = subprocess;
 
     UniValue result_json;
-    bp::opstream stdin_stream;
-    bp::ipstream stdout_stream;
-    bp::ipstream stderr_stream;
+    std::istringstream stdout_stream;
+    std::istringstream 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
-    );
+    auto c = sp::Popen(str_command, sp::input{sp::PIPE}, sp::output{sp::PIPE}, sp::error{sp::PIPE});
     if (!str_std_in.empty()) {
-        stdin_stream << str_std_in << std::endl;
+        c.send(str_std_in);
     }
-    stdin_stream.pipe().close();
+    auto [out_res, err_res] = c.communicate();
+    stdout_stream.str(std::string{out_res.buf.begin(), out_res.buf.end()});
+    stderr_stream.str(std::string{err_res.buf.begin(), err_res.buf.end()});
 
     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();
+    const int n_error = c.retcode();
     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);