#! /bin/sh
# Depends: lockfile-progs, ssh
set -e

if [ -z "$1" ]; then
    echo "Usage: $0 hostname" 2>&1
    exit 1
fi

DIR="$HOME/tmp/.bsmtp"
mkdir -p "$DIR"
cd "$DIR"

HOST="$1"

# TODO: Note that this scheme may currently lose mail if the local disk
# fills up! This is obviously very bad. Fix this.

# By default, lockfile-create gives up after three minutes, so don't cron
# this any more frequently than that without supplying a --retry argument.
lockfile-create "$HOST"
lockfile-touch "$HOST" &
TOUCH="$!"
trap 'kill "$TOUCH"; lockfile-remove "$HOST"' EXIT ERR HUP INT QUIT TERM

ssh -2 -i "$HOME/.ssh/id-bsmtp-$HOST" -C "$HOST" bsmtp-pull-server > "$HOST"
[ -s "$HOST" ] || exit 0
/usr/sbin/sendmail -bS < "$HOST"
rm -f "$HOST"

exit 0