preinst is in libtest-harness-perl 3.23-1.
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 | #!/bin/sh
# Preinstallation script for libtest-harness-perl
#
# Diverts perl's /usr/bin/prove (which comes from an earlier
# version of libtest-harness-perl)
set -e
if [ "$1" = install ] || [ "$1" = upgrade ]
then
dpkg-divert --package libtest-harness-perl --add --rename \
--divert /usr/bin/prove.diverted /usr/bin/prove
fi
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