/usr/share/debhelper/autoscripts/postinst-systemd-dont-enable is in dh-systemd 1.29ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | if deb-systemd-helper debian-installed #UNITFILE#; then
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask #UNITFILE# >/dev/null || true
if deb-systemd-helper --quiet was-enabled #UNITFILE#; then
# Create new symlinks, if any.
deb-systemd-helper enable #UNITFILE# >/dev/null || true
fi
fi
# Update the statefile to add new symlinks (if any), which need to be cleaned
# up on purge. Also remove old symlinks.
deb-systemd-helper update-state #UNITFILE# >/dev/null || true
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