/usr/share/debhelper/autoscripts/preinst-sgmlcatalog is in debhelper 9.20150101+deb8u2.
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 | if test -f #CENTRALCAT# -a "(" "$1" = "upgrade" -o "$1" = "install" -a -n "$2" ")" &&
! dpkg-query -S #CENTRALCAT# >/dev/null 2>&1; then
# If the dpkg-query command returns non-zero, the central catalog is
# not owned by any package. This is due to an old behaviour of
# debhelper. Now that file becomes a conffile. In order to avoid a
# question during installation, we remove the old non-conffile.
mv #CENTRALCAT# #CENTRALCAT#.old
fi
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