preinst is in gnupg-curl 1.4.20-1ubuntu3.
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 18 19 | #!/bin/sh
# preinst script for gnupg-curl
#
# see: dh_installdeb(1)
set -e
if [ "$1" = install ] || [ "$1" = upgrade ] ; then
dpkg-divert --package gnupg-curl \
--divert /usr/lib/gnupg/gpgkeys_curl.non_curl \
--rename /usr/lib/gnupg/gpgkeys_curl
dpkg-divert --package gnupg-curl \
--divert /usr/lib/gnupg/gpgkeys_hkp.non_curl \
--rename /usr/lib/gnupg/gpgkeys_hkp
fi
exit 0
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