rc/bin/mailsync

#!/bin/sh

die () {
    2>&1 echo "$*"
    exit 1
}

maildir=~/mail
mailboxes=$(find "$maildir" -mindepth 1 -maxdepth 1 -type d ! -name cur ! -name tmp ! -name new ! -name .notmuch -printf '%f\n')

LOCKFILE="/tmp/.mailsync.$USER.lock"
# https://stackoverflow.com/questions/185451/quick-and-dirty-way-to-ensure-only-one-instance-of-a-shell-script-is-running-at
# /!\ locking method is susceptible to race condition
# Should be fine for cron job
if [ -e "$LOCKFILE" ] && kill -0 "$(cat "$LOCKFILE")"; then
    echo "mailsync is already running"
    exit 1
fi

# make sure the lockfile is removed when we exit and then claim it
trap "rm -f '$LOCKFILE'; exit" INT TERM EXIT
echo $$ > "$LOCKFILE"

# Try a single short sync to test password availability
mbsync "$(echo "$mailboxes" | head -n 1)" || die "Please unlock password database"

for m in $(echo "$mailboxes" | tail -n+2); do
    mbsync "$m" &
    sleep 1
done

wait

fdm fetch
notmuch new

rm -f "$LOCKFILE"