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|
#!/bin/sh
hosts=""
ssh_options=""
tmux_name="cssh"
usage() {
echo "Usage: $0 [options] host [host ...]" >&2
echo "" >&2
echo "Spawns multiple synchronized SSH sessions inside a tmux session." >&2
echo "" >&2
echo "Options:" >&2
echo " -h Show help" >&2
echo " -c Use the current tmux session and just spawn a new window instead" >&2
echo " -n <name> Name of the tmux session or window (default: cssh)" >&2
echo " -o <ssh args> Additional SSH arguments" >&2
}
while [ $# -ne 0 ]; do
case $1 in
-n)
shift;
if [ $# -eq 0 ]; then
usage
exit 2
fi
tmux_name="$1"; shift
;;
-c)
tmux_attach_current_session="true"; shift
;;
-o)
shift;
if [ $# -eq 0 ]; then
usage
exit 2
fi
ssh_options="$1"; shift
;;
-h)
usage
exit 0
;;
-*)
usage
exit 2
;;
*)
hosts="${hosts}${hosts:+ }$1"; shift
;;
esac
done
if [ -z "${hosts}" ]; then
usage
exit 2
fi
# Find a name for a new session
n=0; while tmux has-session -t "${tmux_name}-${n}" 2>/dev/null; do n=$(($n + 1)); done
tmux_session="${tmux_name}-${n}"
if [ -n "${tmux_attach_current_session}" ]; then
tmux_session=$(tmux display-message -p '#S')
n=0; while tmux list-windows -F "#W" | grep -q "${tmux_name}-${n}" 2>/dev/null; do n=$(($n + 1)); done
tmux_window="${tmux_name}-${n}"
tmux_window_options="-n ${tmux_window}"
fi
# If host doesn't look like a DNS name, it may be a CSSH cluster
if ! echo "${hosts}" | grep -q '[. ]'; then
for cfg in ~/.clusterssh/clusters /etc/clusters; do
if [ -r "${cfg}" ]; then
h="$(sed -n < "${cfg}" "s/^$hosts //p")"
if [ -n "$h" ]; then
hosts="${h}"
break
fi
fi
# If there was no corresponding cluster name,
# just assume we have an unqualified domain name
done
fi
# Open a new session and split into new panes for each SSH session
for host in ${hosts}; do
if ! tmux has-session -t "${tmux_session}" 2>/dev/null; then
tmux new-session -s "${tmux_session}" -d "ssh ${ssh_options} ${host}"
elif [ -n "${tmux_attach_current_session}" ] && ! tmux list-windows -F "#W" | grep -q "${tmux_window}" >/dev/null; then
tmux new-window ${tmux_window_options} "ssh ${ssh_options} ${host}"
else
tmux split-window -t "${tmux_session}" -t ${tmux_window} -d "ssh ${ssh_options} ${host}"
# We have to reset the layout after each new pane otherwise the panes
# quickly become too small to spawn any more
tmux select-layout -t "${tmux_session}" tiled
fi
done
# Synchronize panes by default
if [ -n "${tmux_attach_current_session}" ]; then
tmux set-window-option -t "${tmux_window}" synchronize-panes on
else
tmux set-window-option -t "${tmux_session}" synchronize-panes on
fi
if [ -n "${TMUX}" ]; then
# We are in a tmux, just switch to the new session
tmux switch-client -t "${tmux_session}"
else
# We are NOT in a tmux, attach to the new session
tmux attach-session -t "${tmux_session}"
fi
exit 0
|
