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-rw-r--r--man/systemctl.xml3
-rw-r--r--man/systemd.preset.xml4
-rw-r--r--man/systemd.unit.xml36
3 files changed, 29 insertions, 14 deletions
diff --git a/man/systemctl.xml b/man/systemctl.xml
index 0ad0ad6d7e..78607c9ba3 100644
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -1092,7 +1092,8 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
enabled and disabled, or only enabled, or only disabled.</para>
<para>If the unit carries no install information, it will be silently ignored
- by this command.</para>
+ by this command. <replaceable>NAME</replaceable> must be the real unit name,
+ any alias names are ignored silently.</para>
<para>For more information on the preset policy format, see
<citerefentry><refentrytitle>systemd.preset</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
diff --git a/man/systemd.preset.xml b/man/systemd.preset.xml
index b7164014f0..d09167baaf 100644
--- a/man/systemd.preset.xml
+++ b/man/systemd.preset.xml
@@ -98,6 +98,10 @@
Empty lines and lines whose first non-whitespace character is # or
; are ignored.</para>
+ <para>Presets must refer to the "real" unit file, and not to any aliases. See
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for a description of unit aliasing.</para>
+
<para>Two different directives are understood:
<literal>enable</literal> may be used to enable units by default,
<literal>disable</literal> to disable units by default.</para>
diff --git a/man/systemd.unit.xml b/man/systemd.unit.xml
index 85a7b12d76..f818e772a9 100644
--- a/man/systemd.unit.xml
+++ b/man/systemd.unit.xml
@@ -144,21 +144,31 @@
<option>false</option> and <option>off</option> are
equivalent.</para>
- <para>Time span values encoded in unit files can be written in
- various formats. A stand-alone number specifies a time in seconds.
- If suffixed with a time unit, the unit is honored. A concatenation
- of multiple values with units is supported, in which case the
- values are added up. Example: "50" refers to 50 seconds; "2min
- 200ms" refers to 2 minutes plus 200 milliseconds, i.e. 120200ms.
- The following time units are understood: s, min, h, d, w, ms, us.
- For details see
+ <para>Time span values encoded in unit files can be written in various formats. A stand-alone number specifies a
+ time in seconds. If suffixed with a time unit, the unit is honored. A concatenation of multiple values with units
+ is supported, in which case the values are added up. Example: <literal>50</literal> refers to 50 seconds;
+ <literal>2min 200ms</literal> refers to 2 minutes and 200 milliseconds, i.e. 120200 ms. The following time units
+ are understood: <literal>s</literal>, <literal>min</literal>, <literal>h</literal>, <literal>d</literal>,
+ <literal>w</literal>, <literal>ms</literal>, <literal>us</literal>. For details see
<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
- <para>Empty lines and lines starting with # or ; are
- ignored. This may be used for commenting. Lines ending
- in a backslash are concatenated with the following
- line while reading and the backslash is replaced by a
- space character. This may be used to wrap long lines.</para>
+ <para>Empty lines and lines starting with <literal>#</literal> or <literal>;</literal> are ignored. This may be
+ used for commenting. Lines ending in a backslash are concatenated with the following line while reading and the
+ backslash is replaced by a space character. This may be used to wrap long lines.</para>
+
+ <para>Units can be aliased (have an alternative name), by creating a symlink from the new name to the existing name
+ in one of the unit search paths. For example, <filename>systemd-networkd.service</filename> has the alias
+ <filename>dbus-org.freedesktop.network1.service</filename>, created during installation as the symlink
+ <filename>/usr/lib/systemd/system/dbus-org.freedesktop.network1.service</filename>. In addition, unit files may
+ specify aliases through the <varname>Alias=</varname> directive in the [Install] section; those aliases are only
+ effective when the unit is enabled. When the unit is enabled, symlinks will be created for those names, and removed
+ when the unit is disabled. For example, <filename>reboot.target</filename> specifies
+ <varname>Alias=ctrl-alt-del.target</varname>, so when enabled it will be invoked whenever CTRL+ALT+DEL is
+ pressed. Alias names may be used in commands like <command>enable</command>, <command>disable</command>,
+ <command>start</command>, <command>stop</command>, <command>status</command>, …, and in unit dependency directives
+ <varname>Wants=</varname>, <varname>Requires=</varname>, <varname>Before=</varname>, <varname>After=</varname>, …,
+ with the limitation that aliases specified through <varname>Alias=</varname> are only effective when the unit is
+ enabled. Aliases cannot be used with the <command>preset</command> command.</para>
<para>Along with a unit file <filename>foo.service</filename>, the
directory <filename>foo.service.wants/</filename> may exist. All