/usr/share/tripleo-image-elements/postfix/pre-install.d/59-postfix is in python-tripleo-image-elements 0.7.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/bash
set -eux
# set some defaults for Debian based installs
if [ -f /etc/debian_version ]; then
debconf-set-selections <<< "postfix postfix/main_mailer_type string '${DIB_POSTFIX_INSTALL_TYPE:-Local Only}'"
else
echo "Postfix element currently supports Debian based environments only."
exit 1
fi
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