#!/usr/bin/env pagsh

# I have no idea what I'm doing

# Copyright (c) 2004-2012 Kevin Chen
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

tmux=`which tmux`
if [ ! -x "$tmux" ]; then
	echo "no tmux, gg"
	exit 1
fi
if [ "x$TMUX_SESSION_NAME" = "x" ]; then
    TMUX_SESSION_NAME="owl"
fi

# Check for pre-existing tmuxes.
tmuxlist=`$tmux list-sessions | grep "^$TMUX_SESSION_NAME"`
if [ "x$tmuxlist" != "x" ]; then
    echo "Found a pre-existing $TMUX_SESSION_NAME-tmux session:"
    echo "$tmuxlist"
    echo "You probably want to reattach it instead."
    echo
    exit 1
fi

# Get AFS tokens for the tmux session.
# We are now in a new PAG (because of pagsh).
# If you want to get tokens for other cells, list them in ~/.xlog
aklog

# Use separate kerberos tickets for tmux. Even if we accidentally
# (or intentionally) log out, the tmux session will still have
# tickets.
NEWKRB5=`mktemp -t "krb5cc_${USER}_tmux_XXXXXXXXXX"`

# Copy the tickets we obtained on login to the tmux tickets.
KRB5CCNAME=`echo $KRB5CCNAME | sed 's/FILE://'`
cp $KRB5CCNAME $NEWKRB5

# Now actually use the new tickets.
KRB5CCNAME=FILE:$NEWKRB5; export KRB5CCNAME

# Repeat for krb4 if appropriate.
if [ "x$KRBTKFILE" != "x" ]; then
   NEWKRB4=`mktemp -t "tkt_${USER}_tmux_XXXXXXXXXX"`
   KRBTKFILE=`echo $KRBTKFILE | sed 's/FILE://'`
   cp $KRBTKFILE $NEWKRB4
   KRBTKFILE=$NEWKRB4; export KRBTKFILE
fi

# Figure out which zephyr client to use.  Defaults to barnowl.
if [ "x$ZEPHYR_TMUX_CLIENT" = "x" ]; then
    barnowl=`which barnowl`
    if [ ! -x "$barnowl" ]; then
	attach -n -q barnowl
	barnowl=`athdir /mit/barnowl`/barnowl
    fi
    ZEPHYR_TMUX_CLIENT="$barnowl"
fi

# Renew tickets and tokens.
contrenew=`which cont-renew-notify`
if [ ! -x "$contrenew" ]; then
    attach -n -q kchen
    contrenew=`athdir /mit/kchen`/cont-renew-notify
fi
nohup $contrenew < /dev/null > /dev/null 2> /dev/null &

# Name the tmux $TMUX_SESSION_NAME so we can reattach the right
# tmux later.
$tmux new-session -s $TMUX_SESSION_NAME $ZEPHYR_TMUX_CLIENT