man: add man page for ask-password

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diff --git a/man/systemd-ask-password.xml b/man/systemd-ask-password.xml
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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+        "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-ask-password">
+
+        <refentryinfo>
+                <title>systemd-ask-password</title>
+                <productname>systemd</productname>
+
+                <authorgroup>
+                        <author>
+                                <contrib>Developer</contrib>
+                                <firstname>Lennart</firstname>
+                                <surname>Poettering</surname>
+                                <email>lennart@poettering.net</email>
+                        </author>
+                </authorgroup>
+        </refentryinfo>
+
+        <refmeta>
+                <refentrytitle>systemd-ask-password</refentrytitle>
+                <manvolnum>1</manvolnum>
+        </refmeta>
+
+        <refnamediv>
+                <refname>systemd-ask-password</refname>
+                <refpurpose>Query the user for a system password</refpurpose>
+        </refnamediv>
+
+        <refsynopsisdiv>
+                <cmdsynopsis>
+                        <command>systemd-ask-password <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt">MESSAGE</arg></command>
+                </cmdsynopsis>
+        </refsynopsisdiv>
+
+        <refsect1>
+                <title>Description</title>
+
+                <para><command>systemd-ask-password</command> may be
+                used to query a system password or passphrase from the
+                user, using a question message specified on the
+                command line. When run from a TTY it will query a
+                password on the TTY and print it to STDOUT. When run
+                with no TTY or with <option>--no-tty</option> it will
+                query the password system-wide and allow active users
+                to respond via several agents. The latter is
+                only available to privileged processes.</para>
+
+                <para>The purpose of this tool is to query system-wide
+                passwords -- that is passwords not attached to a
+                specific user account. Examples include: unlocking
+                encrypted hard disks when they are plugged in or at
+                boot, entering an SSL certificate passphrase for web
+                and VPN servers.</para>
+
+                <para>Existing agents are: a boot-time password agent
+                asking the user for passwords using Plymouth; a
+                boot-time password agent querying the user directly on
+                the console; an agent requesting password input via a
+                <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                message; an agent suitable for running in a GNOME
+                session; a command line agent which can be started
+                temporarily to process queued password requests; a TTY
+                agent that is temporarily spawned during
+                <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                invocations.</para>
+
+                <para>Additional password agents may be implemented
+                according to the <ulink
+                url="http://www.freedesktop.org/wiki/Software/systemd/PasswordAgents">systemd
+                Password Agent Specification</ulink>.</para>
+
+                <para>If a password is queried on a tty the user may
+                press TAB to hide the asterisks normally shown for
+                each character typed. Pressing Backspace as first key
+                achieves the same effect.</para>
+
+        </refsect1>
+
+        <refsect1>
+                <title>Options</title>
+
+                <para>The following options are understood:</para>
+
+                <variablelist>
+                        <varlistentry>
+                                <term><option>--h</option></term>
+                                <term><option>--help</option></term>
+
+                                <listitem><para>Prints a short help
+                                text and exits.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--icon=</option></term>
+
+                                <listitem><para>Specify an icon name
+                                alongside the pasword query, which may
+                                be used in all agents supporting
+                                graphical display. The icon name
+                                should follow the <ulink
+                                url="http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html">XDG
+                                Icon Naming
+                                Specification</ulink>.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--timeout=</option></term>
+
+                                <listitem><para>Specify the query
+                                timeout in seconds.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--no-tty</option></term>
+
+                                <listitem><para>Never ask for password
+                                on current TTY even if one is
+                                available. Always use agent
+                                system.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--accept-cached</option></term>
+
+                                <listitem><para>If passed accept
+                                cached passwords, i.e. passwords
+                                previously typed in.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--multiple</option></term>
+
+                                <listitem><para>When used in
+                                conjunction with
+                                <option>--accept-cached</option>
+                                accept multiple passwords. This will
+                                output one password per
+                                line.</para></listitem>
+                        </varlistentry>
+                </variablelist>
+
+        </refsect1>
+
+        <refsect1>
+                <title>Exit status</title>
+
+                <para>On success 0 is returned, a non-zero failure
+                code otherwise.</para>
+        </refsect1>
+
+        <refsect1>
+                <title>See Also</title>
+                <para>
+                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                </para>
+        </refsect1>
+
+</refentry>