Add option isInteractive

src/libutil/util.cc

@@ -1141,9 +1141,9 @@ std::vector<char *> stringsToCharPtrs(const Strings & ss)
 }
 
 std::string runProgram(Path program, bool searchPath, const Strings & args,
-    const std::optional<std::string> & input)
+    const std::optional<std::string> & input, bool isInteractive)
 {
-    auto res = runProgram(RunOptions {.program = program, .searchPath = searchPath, .args = args, .input = input});
+    auto res = runProgram(RunOptions {.program = program, .searchPath = searchPath, .args = args, .input = input, .isInteractive = isInteractive});
 
     if (!statusOk(res.first))
         throw ExecError(res.first, "program '%1%' %2%", program, statusToString(res.first));
@@ -1193,6 +1193,16 @@ void runProgram2(const RunOptions & options)
     // case), so we can't use it if we alter the environment
     processOptions.allowVfork = !options.environment;
 
+    std::optional<Finally<std::function<void()>>> resumeLoggerDefer;
+    if (options.isInteractive) {
+        logger->pause();
+        resumeLoggerDefer.emplace(
+            []() {
+                logger->resume();
+            }
+        );
+    }
+
     /* Fork. */
     Pid pid = startProcess([&]() {
         if (options.environment)

src/libutil/util.hh

@@ -415,7 +415,7 @@ pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = P
  */
 std::string runProgram(Path program, bool searchPath = false,
     const Strings & args = Strings(),
-    const std::optional<std::string> & input = {});
+    const std::optional<std::string> & input = {}, bool isInteractive = false);
 
 struct RunOptions
 {
@@ -430,6 +430,7 @@ struct RunOptions
     Source * standardIn = nullptr;
     Sink * standardOut = nullptr;
     bool mergeStderrToStdout = false;
+    bool isInteractive = false;
 };
 
 std::pair<int, std::string> runProgram(RunOptions && options);