postinst is in crawl-common 2:0.21.1-1.
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 | #!/bin/sh
set -e
# Everything here is clean-up from old versions that used to be setgid.
OLDDIR=/var/games/crawl/saves
DIR=/var/games/crawl
# Drop the old db cache; the new one is in ~/.crawl/ for security reasons.
rm -rf $OLDDIR/db
rm -rf $OLDDIR/des
rm -f $OLDDIR/*.prf
# We keep old saves and bones for now, they're incompatible but the user may
# decide to downgrade to complete a game in progress.
rmdir $OLDDIR $DIR/morgue $DIR >/dev/null 2>/dev/null || true
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