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systemd/man/systemd-ask-password.xml
Tom Gundersen 12b42c7667 man: revert dynamic paths for split-usr setups
This did not really work out as we had hoped. Trying to do this upstream
introduced several problems that probably makes it better suited as a
downstream patch after all. At any rate, it is not releaseable in the
current state, so we at least need to revert this before the release.

 * by adjusting the path to binaries, but not do the same thing to the
   search path we end up with inconsistent man-pages. Adjusting the search
   path too would be quite messy, and it is not at all obvious that this is
   worth the effort, but at any rate it would have to be done before we
   could ship this.

 * this means that distributed man-pages does not make sense as they depend
   on config options, and for better or worse we are still distributing
   man pages, so that is something that definitely needs sorting out before
   we could ship with this patch.

 * we have long held that split-usr is only minimally supported in order
   to boot, and something we hope will eventually go away. So before we start
   adding even more magic/effort in order to make this work nicely, we should
   probably question if it makes sense at all.
2015-06-18 19:47:44 +02:00

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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">
<!--
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Copyright 2011 Lennart Poettering
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You should have received a copy of the GNU Lesser General Public License
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-->
<refentry id="systemd-ask-password"
xmlns:xi="http://www.w3.org/2001/XInclude">
<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 standard output. 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 project='man-pages'><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>--icon=</option></term>
<listitem><para>Specify an icon name alongside the password
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. Defaults
to 90s. A timeout of 0 waits indefinitely. </para></listitem>
</varlistentry>
<varlistentry>
<term><option>--echo</option></term>
<listitem><para>Echo the user input instead of masking it.
This is useful when using
<filename>systemd-ask-password</filename> to query for
usernames. </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>
<xi:include href="standard-options.xml" xpointer="help" />
</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 project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>