postinst is in solr-tomcat 3.6.2+dfsg-2.
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 | #!/bin/sh
set -e
# If proper permissions for the stuff under /var/lib/solr haven't
# been set, set them now
case "$1" in
    configure)
        # fixup for upgrade from solr-tomcat55, wich makes this tomcat55:root 750
        chown root:root /var/lib/solr
        chmod 755 /var/lib/solr
        chown -R tomcat6:tomcat6 /var/lib/solr/data
        chmod -R 770 /var/lib/solr/data
        ln -sf /etc/solr/tomcat.policy /etc/tomcat6/policy.d/05solr.policy
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
invoke-rc.d --quiet tomcat6 restart || {
    RESULT=$?
    # Ignore if tomcat6 init script does not exist (yet)
    if [ $RESULT != 100 ]; then
	    exit $RESULT
    fi
}
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