Handle ssh-agent socket going away.

git-svn-id: https://svn.cambridge.iain.cx/profile/trunk@47 6be0d1a5-5cfe-0310-89b6-964be062b18b

diff --git a/.profile.d/ssh.bashrc b/.profile.d/ssh.bashrc
index 1e02b1c..5f3c1a5 100644 (file)
--- a/.profile.d/ssh.bashrc
+++ b/.profile.d/ssh.bashrc
@@ -2,6 +2,10 @@
 
 SOCKET=~/.ssh/agent
 
+function get_agent_pid() {
+  ps waux | grep -- ^$USER\ .\*ssh-agent\ -a\ .\*\ -s | grep -v grep | awk '{ print $2 }' | head -n 1
+}
+
 if [ ! -z "$SSH_CLIENT" ]; then
   # Set display if we aren't already forwarding X11
   if [ "$DISPLAY" = "" ]; then
@@ -12,7 +16,17 @@ fi
 # Try to hook up with already running ssh-agent.
 if [ $UID -gt 0 ]; then
   # Not all OSes support ``ps -wu''.
-  RUNNING_AGENT="$(ps waux | grep -- ^$USER\ .\*ssh-agent\ -a\ .\*\ -s | grep -v grep | awk '{ print $2 }' | head -n 1)"
+  RUNNING_AGENT="$(get_agent_pid)"
+
+  # Has the socket gone away?
+  if [ ! -z "$RUNNING_AGENT" -a ! -S "$SOCKET" ]; then
+    if kill $RUNNING_AGENT; then
+      RUNNING_AGENT="$(get_agent_pid)"
+    else
+      echo >&2 "$SOCKET has gone away but agent is running as PID $RUNNING_AGENT."
+    fi
+  fi
+
   if [ -z "$SSH_AGENT_PID" -o ! "$SSH_AGENT_PID" = "$RUNNING_AGENT" ]; then
     export SSH_AGENT_PID="$RUNNING_AGENT"
     if [ "$SSH_AGENT_PID" = "" ]; then
@@ -31,3 +45,4 @@ if [ $UID -gt 0 ]; then
 fi
 
 unset SOCKET
+unset get_agent_pid