postinst is in appstream 0.12.0-3.
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 | #!/bin/sh
# postinst script for appstream
set -e
# Force-upgrade the cache, to ensure it matches the installed
# version of AppStream and is present.
appstreamcli refresh-cache --force || true
exit 0
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