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File name : postfix-instance-generator

Content :

#!/bin/sh

set -e

WANTDIR="$1/postfix.service.wants"
SERVICEFILE="/lib/systemd/system/postfix@.service"

mkdir -p "$WANTDIR"

ln -s "$SERVICEFILE" "$WANTDIR/postfix@-.service"
for DIR in $(postconf -h multi_instance_directories); do
    ln -s "$SERVICEFILE" "$WANTDIR/postfix@$(postconf -o inet_interfaces= -hc $DIR multi_instance_name).service"
done

exit 0