Hack to get SSH error messages from build-remote

E.g.

  cannot build on 'ssh://mac1': cannot connect to 'mac1': bash: nix-store: command not found
  cannot build on 'ssh://mac2': cannot connect to 'mac2': Host key verification failed.
  cannot build on 'ssh://mac3': cannot connect to 'mac3': Received disconnect from 213... port 6001:2: Too many authentication failures
  Authentication failed.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/build-remote/build-remote.cc b/src/build-remote/build-remote.cc
index 6b294a4d2c..9cd01bb61b 100644
--- a/src/build-remote/build-remote.cc
+++ b/src/build-remote/build-remote.cc
@@ -191,8 +191,10 @@ int main (int argc, char * * argv)
                     storeUri = bestMachine->storeUri;
 
                 } catch (std::exception & e) {
-                    printError("unable to open SSH connection to '%s': %s; trying other available machines...",
-                        bestMachine->storeUri, e.what());
+                    auto msg = chomp(drainFD(5, false));
+                    printError("cannot build on '%s': %s%s",
+                        bestMachine->storeUri, e.what(),
+                        (msg.empty() ? "" : ": " + msg));
                     bestMachine->enabled = false;
                     continue;
                 }
@@ -202,6 +204,8 @@ int main (int argc, char * * argv)
         }
 
 connected:
+        close(5);
+
         std::cerr << "# accept\n" << storeUri << "\n";
 
         auto inputs = readStrings<PathSet>(source);