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debian/mandos.postinst
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#!/bin/sh -e
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# This script can be called in the following ways:
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#
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# After the package was installed:
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#       <postinst> configure <old-version>
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#
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#
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# If prerm fails during upgrade or fails on failed upgrade:
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#       <old-postinst> abort-upgrade <new-version>
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#
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# If prerm fails during deconfiguration of a package:
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#       <postinst> abort-deconfigure in-favour <new-package> <version>
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#                  removing <old-package> <version>
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#
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# If prerm fails during replacement due to conflict:
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#       <postinst> abort-remove in-favour <new-package> <version>
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case "$1" in
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    configure)
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        # Rename old "mandos" user and group
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        if dpkg --compare-versions "$2" lt "1.0.3-1"; then
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            case "`getent passwd mandos`" in
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                *:Mandos\ password\ system,,,:/nonexistent:/bin/false)
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                    usermod --login _mandos mandos
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                    groupmod --new-name _mandos mandos
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                    ;;
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            esac
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        fi
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        # Create new user and group
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        if ! getent passwd _mandos >/dev/null; then
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            adduser --system --force-badname --quiet \
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                --home /nonexistent --no-create-home --group \
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                --disabled-password --gecos "Mandos password system" \
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                _mandos
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        fi
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        ;;
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    abort-upgrade|abort-deconfigure|abort-remove)
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        ;;
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    *)
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        echo "$0 called with unknown argument '$1'" 1>&2
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        exit 1
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        ;;
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esac
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#DEBHELPER#
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exit 0