postinst is in uwsgi-plugin-asyncio-python3 2.0.12-5ubuntu3.
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 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | #!/bin/sh
# postinst script for uwsgi-plugin-asyncio-python3
#
# see: dh_installdeb(1)
set -e
# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
case "$1" in
    configure)
      DEFAULTFLAVOR_DOTLESS=python35
      for flavor_dotless in python35; do
        if [ "x$flavor_dotless" = "x$DEFAULTFLAVOR_DOTLESS" ]; then
          ALTERNATIVE_PRIORITY=75
        else
          ALTERNATIVE_PRIORITY=35
        fi
        update-alternatives --quiet \
          --install \
            /usr/lib/uwsgi/plugins/asyncio_python3_plugin.so \
            uwsgi-plugin-asyncio-python3 \
            /usr/lib/uwsgi/plugins/asyncio_${flavor_dotless}_plugin.so \
            $ALTERNATIVE_PRIORITY
      done
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
exit 0
 |