source: debian/i2p.postinst @ 03ff4dc0

#!/bin/sh  -e

I2PHOME=/var/lib/i2p
I2PSYSUSER=i2psvc

conffile="/etc/default/i2p"

# Source debconf library -- we have a Depends line
# to make sure it is there...
. /usr/share/debconf/confmodule
db_version 2.0


case "$1" in
    configure|reconfigure)
        if [ ! -e $conffile ]; then
            echo "# Defaults for i2p initscript (/etc/init.d/i2p" >> $conffile
            echo "# This is a posix shell fragment" >> $conffile
            echo >> $conffile
            echo "# [automatically edited by postinst, do not change line format ]" >> $conffile
            echo "# Run 'dpkg-reconfigure -plow i2p' to change these values." >> $conffile
            echo >> $conffile
            echo "RUN_DAEMON=" >> $conffile
            echo "I2PUSER=" >> $conffile
            echo "# The next value is also wrapper.java.maxmemory in /etc/i2p/wrapper.config" >> $conffile
            echo "MEMORYLIMIT=" >> $conffile
        fi

        db_get i2p/daemon
        RUN_DAEMON="$RET"
        db_get i2p/user
        I2PUSER="$RET"
        db_get i2p/memory
        MEMORYLIMIT="$RET"

        cp -a -f $conffile $conffile.tmp

        # If the admin deleted or commented some variables but then set them via debconf,
        # (re-)add them to the conffile.
        test -z "$RUN_DAEMON" || grep -Eq '^ *RUN_DAEMON=' $conffile || \
            echo "RUN_DAEMON=" >> $conffile
        test -z "$I2PUSER" || grep -Eq '^ *I2PUSER=' $conffile || \
            echo "I2PUSER=" >> $conffile
        test -z "$MEMORYLIMIT" || grep -Eq '^ *MEMORYLIMIT=' $conffile || \
            echo "MEMORYLIMIT=" >> $conffile

        if [ -z $RUN_DAEMON ]; then
            RUN_DAEMON="false"
            I2PUSER="i2psvc"
        fi



        sed -e "s/^ *RUN_DAEMON=.*/RUN_DAEMON=\"$RUN_DAEMON\"/" \
            -e "s/^ *I2PUSER=.*/I2PUSER=\"$I2PUSER\"/" \
            -e "s/^ *MEMORYLIMIT=.*/MEMORYLIMIT=\"$MEMORYLIMIT\"/" \
            < $conffile > $conffile.tmp
        mv -f $conffile.tmp $conffile

        sed -e "s/^ *wrapper\.java\.maxmemory=.*/wrapper\.java\.maxmemory=$MEMORYLIMIT/" \
            < /etc/i2p/wrapper.config > /etc/i2p/wrapper.config.tmp
        mv -f /etc/i2p/wrapper.config.tmp /etc/i2p/wrapper.config

    migrate_existing_user(){
        # Adjust the user/group in /etc/passwd, mainly for upgrades from old packages that didn't
        # create $I2PSYSUSER as a system group/user
        usermod -c "I2P Router Daemon" -m -d $I2PHOME -g $I2PSYSUSER -s "/bin/false" \
            -l $I2PSYSUSER -e 1 > /dev/null 2>&1
        echo "Existing user migrated, home directory moved to $I2PHOME"
    }

    # Create user and group as a system user.
    adduser --system --quiet --group --home $I2PHOME $I2PSYSUSER || migrate_existing_user

    [ -d /var/log/i2p ] || mkdir -m0750 /var/log/i2p
    chown -f -R $I2PSYSUSER:adm /var/log/i2p

    # Has someone set the permissions with dpkg-statoverride? If so, obey them.
    if ! dpkg-statoverride --list $I2PHOME > /dev/null 2>&1
    then
        chown -f -R $I2PSYSUSER:$I2PSYSUSER $I2PHOME
        chmod -f u=rwx,g=rxs,o= $I2PHOME
    fi

    db_stop
;;
abort-upgrade|abort-remove|abort-deconfigure)
    echo "Aborting upgrade"
    exit 0
    ;;
*)
        echo "postinst called with unknown argument \`$1'" >&2
                exit 0
                ;;
esac
    
#DEBHELPER#

exit 0