wjones127 commented on code in PR #13520:
URL: https://github.com/apache/arrow/pull/13520#discussion_r916280629
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cpp/src/arrow/filesystem/gcsfs_test.cc:
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@@ -105,9 +106,21 @@ class GcsTestbench : public ::testing::Environment {
error += " (exe not found)";
continue;
}
-
- server_process_ = bp::child(exe_path, "-m", "testbench", "--port",
port_, group_);
- if (server_process_.valid() && server_process_.running()) break;
+ // TODO: should I be worried about lifetime of this variable?
+ bp::ipstream output;
+
+ server_process_ = bp::child(exe_path, "-m", "testbench", "--port",
port_, group_,
+ bp::std_err > output);
+ // Wait for message: "* Restarting with"
+ auto testbench_is_running = [&output](bp::child& process) {
+ std::string line;
+ while (process.valid() && process.running() && std::getline(output,
line)) {
+ if (line.find("* Restarting with") != std::string::npos) return true;
+ }
+ return false;
+ };
+
+ if (testbench_is_running(server_process_)) break;
Review Comment:
I think the case I'm wary of is that the program doesn't write anything to
std err for a while. IIUC `get_line` blocks until a line is retrieved, so in
that case it could hang.
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