msimerson/Mail-Toaster-6

#!/bin/sh

# shellcheck disable=SC2044
for _f in $(find /data/vpopmail/ -type f -name .qmail); do

    # ignore files that don't specify maildrop
    if ! grep -q maildrop "$_f"; then continue; fi

    _lines=$(wc -l < "$_f" | bc)
    if [ "$_lines" = 1 ]; then
        # files with only a mailfilter rule can be deleted
        echo "$_lines: rm $_f"
        rm "$_f"
        continue
    fi

    # multiple delivery rules are in the file (see 'man dot-qmail')

    # extract all that isn't a maildrop invocation
    _contents=$(grep -v maildrop "$_f")

    # replace the maildrop rule with fully qualified path to Maildir
    _maildir="$(dirname "$_f" | sed -e 's|/data/vpopmail/home|/usr/local/vpopmail|')/Maildir/"

    echo "$_lines"
    echo "$_f"
    echo

    #echo "$_contents"
    #echo

    # write a new .qmail with the FQ Maildir + other delivery rules
    echo "$_contents" > "$_f.new" || exit 1
    echo "$_maildir" >> "$_f.new" || exit 1
    chown 89:89 "$_f.new" || exit 1
    chmod 600 "$_f.new" || exit 1

    # atomically replace the existing .qmail
    #echo "mv $_f.new $_f"
    #mv "$_f.new" "$_f"
done