tang/debian/tang.postinst

#!/bin/sh

set -e

DB_DIR_OLD=/var/db/tang
DB_DIR=/var/lib/tang

case "$1" in
configure)
    if ! getent passwd _tang >/dev/null; then
        adduser --quiet --system --group --no-create-home --home /nonexistent --force-badname _tang
    fi

    # Migrate tang db:
    # * Change location
    # * Give it to _tang user
    # (Retire after bookworm release)
    if \
        dpkg --compare-versions "$2" lt "10-3" &&
        [ -d "$DB_DIR_OLD" ] &&
        [ ! -d "$DB_DIR" ]
    then
        echo 'I: Migrating tang db'
        mv "$DB_DIR_OLD" "$DB_DIR"
        chown -R _tang:_tang "$DB_DIR"
    fi

    # Possibly remove /var/db/
    # (Retire after bookworm release)
    if \
        dpkg --compare-versions "$2" lt "10-3" &&
        [ -d /var/db/ ]
    then
        rmdir /var/db/ >/dev/null 2>&1 || :
    fi

    # assert db directory
    mkdir -p "$DB_DIR"
    chown _tang:_tang "$DB_DIR"

    ;;
abort-upgrade|abort-remove|abort-deconfigure)
    ;;
*)
    echo "postinst called with unknown argument '$1'" >&2
    exit 1
    ;;
esac

#DEBHELPER#
exit 0