hacks/ssh: Redirect the master's output and error.

Otherwise it inherits our streams, and something waiting from EOF from
us will become seriously disappointed.  It's not like the master has
anything especially interesting to say on stdout anyway.  The error
stream is captured into a logfile for later perusal.

Just stdout wasn't enough.

diff --git a/hacks/ssh b/hacks/ssh
index a11c777..16b7578 100755 (executable)
--- a/hacks/ssh
+++ b/hacks/ssh
@@ -25,6 +25,8 @@
 ### Configuration.
 
 : ${REAL_SSH=/usr/bin/ssh}
+: ${SSH_HOME=$(unset HOME; bash -c 'echo ~/.ssh')}
+: ${SSH_LOGDIR=$SSH_HOME/log-$(hostname)}
 
 ###--------------------------------------------------------------------------
 ### Parse the command line and dredge out information.
@@ -113,6 +115,13 @@ while :; do
            login=$arg
            ;;
 
+         ## Catch the port number.  We want this for building the logfile
+         ## name.
+         ?,p*)
+           masteropts=("${masteropts[@]}" "-p$arg")
+           port=$arg
+           ;;
+
          ## These options are interesting to the master connection.
          m,[aADLlRSwxXv]*)
            masteropts=("${masteropts[@]}" "-${o:0:1}$arg")
@@ -162,8 +171,11 @@ case "$mode" in
     exec "$REAL_SSH" "${opts[@]}" ${host+"$host"} "$@"
     ;;
   m)
+    mkdir -p -m700 "$SSH_LOGDIR"
+    logfile=$SSH_LOGDIR/${login+"$login@"}"$host"${port+":$port"}.log
     if ! "$REAL_SSH" -Ocheck ${login+"$login@"}"$host" >/dev/null 2>&1; then
-      "$REAL_SSH" -MNf "${masteropts[@]}" "$host"
+      "$REAL_SSH" -MNf "${masteropts[@]}" "$host" \
+       </dev/null >/dev/null 2>$logfile
     fi
     exec "$REAL_SSH" ${opts[@]} "$host" "$@"
     ;;