preinst is in libapache2-mod-svn 1.9.3-2ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #!/bin/sh
set -e
case "$1" in
install | upgrade)
# The transition from dav_svn.load with authz_svn_module in it,
# to a separate .load file, happened in 1.6.17dfsg-2. Here we
# signal the postinst, with a temp file, to enable authz_svn.
if grep -q '^LoadModule *authz_svn_module' \
/etc/apache2/mods-enabled/dav_svn.load 2>/dev/null; then
touch '/etc/apache2/#enable_authz_svn#'
fi
;;
esac
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