share

#!/bin/sh
SERVER="${SERVER:-Mumble}"
shareuser="felix@$SERVER"

set -e

for COMMAND in abduco socat ssh dvtm; do
	if ! command -v $COMMAND > /dev/null 2>&1; then
		printf '%s found: no\n' "$COMMAND"
		exit
	fi
done

if ! printf '%s' "$1" | grep '^[a-z0-9-]\+$'; then
	echo 'Please provide an alphanumeric (and -) session name'
	exit 1
fi

# Create a temporary directory for our sockets
umask 077
socketdir="$(mktemp -d)"
trap "rm -rf '$socketdir'" EXIT

# Create the session in which we'll teach, in the background
SESSION_NAME="$1" SESSION_SOCKET="$socketdir/abduco" abduco -n "$socketdir/abduco" dvtm

# Create an SSH master connection in the background, to allow asking for passphrases
ssh -N -f -M -S "$socketdir/ssh" "$shareuser"

# Connect our sessions socket to a remote file over our existing ssh connection
socat -u unix-connect:"$socketdir/abduco" exec:"ssh -S '$socketdir/ssh' '$shareuser' 'socat -u - create:/tmp/socks/$1,unlink-early,mode=777'" &
socatpid="$!"

# Keep 'resizing' our screen to resend the whole thing
while pkill -SIGWINCH dvtm; do
	sleep 1
done &
resizepid="$!"

# Attach to the session created earlier
abduco -a "$socketdir/abduco"

# Close in reverse order
kill "$resizepid"
kill "$socatpid"
ssh -O exit -S "$socketdir/ssh" "$shareuser"
wait