preinst is in libdigest-sha-perl 6.01-1.
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 14 15 16 17 18 19 20 21 22 23 | #!/bin/sh
set -e
# diversion first introduced in 5.62-2
if [ upgrade != "$1" ] || dpkg --compare-versions "$2" lt 5.62-2
then
dpkg-divert --add --package libdigest-sha-perl --rename \
--divert /usr/bin/shasum.bundled /usr/bin/shasum
# this diversion is needed even if we don't actually ship shasum.1.gz,
# because otherwise it takes precedence over shasum.1p.gz (which we do
# ship)
dpkg-divert --add --package libdigest-sha-perl --rename \
--divert /usr/share/man/man1/shasum.bundled.1.gz /usr/share/man/man1/shasum.1.gz
fi
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
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