postrm is in solr-common 3.6.2+dfsg-11.
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 | #!/bin/sh
set -e
if [ "$1" = "purge"  ]; then
    if [ -e /usr/share/debconf/confmodule ]; then
        . /usr/share/debconf/confmodule
        db_input high solr/purgeindexfiles || true
        db_go || true
        db_get solr/purgeindexfiles || true
        if [ "$RET" = "true" ]; then
            rm -rf /var/lib/solr
        fi
    else
        rm -rf /var/lib/solr
    fi
fi
# Automatically added by dh_installdebconf/11ubuntu1
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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