add tokenforwarding for etoken and x2go

bashrc_add

@@ -127,6 +127,9 @@ EOF
     # source loading defaults part of myshellconfig
     . "${MYSHELLCONFIG_BASE}/myshell_load_defaults"
 
+    # source loading workaround for x2go to forward local etoken to remote machine with forwardagent
+    . "${MYSHELLCONFIG_BASE}/myshell_load_x2go_tokenforward"
+
     cat << EOF >> "${MYSHELLCONFIG_LOGFILE}"
     --8<--- end ---------------- $(date) ---------------8<--
 

myshell_load_x2go_tokenforward

@@ -0,0 +1,52 @@
+# --- BEGIN X2Go SSH forwarding workaround ---
+
+
+# Part that runs in regular SSH session
+
+# check we have an agent socket and
+# check we have an ~/.x2go directory
+echo "SSH_AUTH_SOCK: ${SSH_AUTH_SOCK-x} - ${SSH_AUTH_SOCK+x} - ${SSH_AUTH_SOCK}"
+if [ -n "$SSH_AUTH_SOCK" ] && \
+   [ -d ~/.x2go ] && \
+   [ -z "$X2GO_AGENT_PID" ] ; then
+        # touch the output file and set permissions
+        # (as tight as possible)
+        touch ~/.x2go/agentsocket
+        chmod 600 ~/.x2go/agentsocket
+        chown $USER ~/.x2go/agentsocket
+        # write file name of agent socket into file
+        echo old agentsock
+        cat ~/.x2go/agentsocket
+        echo $SSH_AUTH_SOCK >~/.x2go/agentsocket
+        echo "write SSH_AUTH_SOCK to ~/.x2go/agentsocket"
+fi
+
+# Part that runs in X2Go session
+
+# check we're on an X2GoServer (x2golistsessions is in path),
+# check we have a DISPLAY set, and
+# check our client DISPLAY and SSH client IP correspond to
+# a running X2Go session and
+# check ~/.x2go/agentsocket is a regular file
+if which x2golistsessions >/dev/null && \
+   [ -n "$DISPLAY" ] && \
+   [ -n "$(x2golistsessions | \
+        awk -F '|' '":"$3 == "'$DISPLAY'" && \
+                    $5 == "R" && \
+                    $8 == "'$(echo $SSH_CLIENT | \
+                    awk '{print $1}')'" { print $3 }')" ] && \
+   [ -f ~/.x2go/agentsocket ] ; then
+        # all checks passed, read content of file
+        # (might still contain stale agent socket or garbage
+        MIGHTBEOURAGENT=$(cat ~/.x2go/agentsocket)
+        # check if it corresponds to an existing socket
+        echo "MIGHTBEOURAGENT: $MIGHTBEOURAGENT"
+        if [ -S "$MIGHTBEOURAGENT" ]; then
+                # export path to agent socket
+                export SSH_AUTH_SOCK=$MIGHTBEOURAGENT
+                echo export it
+        fi
+fi
+
+
+# ---- END X2Go SSH forwarding workaround ----