preinst is in tt-rss 17.1+git20170410+dfsg-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 | #!/bin/sh
set -e
# clear cache (needed for upgrade)
# this will be done in prerm in the future, but
# for a transitional period is also done in preinst,
# since the old prerm file is used, which may not
# yet clear the cache during upgrade.
if [ "$1" = "upgrade" ] ; then
find /var/cache/tt-rss -type f -delete
fi;
exit 0
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