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man,docs: document the new unit file directory for attached images

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This commit is contained in:
Lennart Poettering 2018-10-08 18:43:14 +02:00
parent 339731dba1
commit 83f72cd65f
3 changed files with 21 additions and 12 deletions
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15
docs/PORTABLE_SERVICES.md
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@ -98,16 +98,17 @@ This command does the following:
`foobar@.{service|socket|target|timer|path}` as well as
`foobar.*.{service|socket|target|timer|path}` and
`foobar.{service|socket|target|timer|path}` are copied out. These unit files
are placed in `/etc/systemd/system/` like regular unit files. Within the
images the unit files are looked for at the usual locations, i.e. in
`/usr/lib/systemd/system/` and `/etc/systemd/system/` and so on, relative to
the image's root.
are placed in `/etc/systemd/system.attached/` (which is part of the normal
unit file search path of PID 1, and thus loaded exactly like regular unit
files). Within the images the unit files are looked for at the usual
locations, i.e. in `/usr/lib/systemd/system/` and `/etc/systemd/system/` and
so on, relative to the image's root.
3. For each such unit file a drop-in file is created. Let's say
`foobar-waldo.service` was one of the unit files copied to
`/etc/systemd/system/`, then a drop-in file
`/etc/systemd/system/foobar-waldo.service.d/20-portable.conf` is created,
containing a few lines of additional configuration:
`/etc/systemd/system.attached/`, then a drop-in file
`/etc/systemd/system.attached/foobar-waldo.service.d/20-portable.conf` is
created, containing a few lines of additional configuration:
```
[Service]

16
man/portablectl.xml
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@ -101,9 +101,9 @@
<term><option>--runtime</option></term>
<listitem><para>When specified the unit and drop-in files are placed in
<filename>/run/systemd/system/</filename> instead of <filename>/etc/systemd/system/</filename>. Images attached
with this option set hence remain attached only until the next reboot, while they are normally attached
persistently.</para></listitem>
<filename>/run/systemd/system.attached/</filename> instead of
<filename>/etc/systemd/system.attached/</filename>. Images attached with this option set hence remain attached
only until the next reboot, while they are normally attached persistently.</para></listitem>
</varlistentry>
<varlistentry>
@ -167,8 +167,10 @@
<listitem><para>All unit files of types <filename>.service</filename>, <filename>.socket</filename>,
<filename>.target</filename>, <filename>.timer</filename> and <filename>.path</filename> which match the
indicated unit file name prefix are copied from the image to the host's
<filename>/etc/systemd/system/</filename> directory (or <filename>/run/systemd/system/</filename> — depending
whether <option>--runtime</option> is specified, see above).</para></listitem>
<filename>/etc/systemd/system.attached/</filename> directory (or
<filename>/run/systemd/system.attached/</filename> — depending whether <option>--runtime</option> is
specified, see above), which is included in the built-in unit search path of the system service
manager.</para></listitem>
<listitem><para>For unit files of type <filename>.service</filename> a drop-in is added to these copies that
adds <varname>RootDirectory=</varname> or <varname>RootImage=</varname> settings (see
@ -330,6 +332,10 @@
to place image files directly in <filename>/etc/portables/</filename> or
<filename>/run/systemd/portables/</filename> (as these are generally not suitable for storing large or non-textual
data), but use these directories only for linking images located elsewhere into the image search path.</para>
<para>When a portable service image is attached, matching unit files are copied onto the host into the
<filename>/etc/systemd/system.attached/</filename> and <filename>/run/systemd/system.attached/</filename>
directories. When an image is detached, the unit files are removed again from these directories.</para>
</refsect1>
<refsect1>

2
man/systemd.unit.xml
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@ -44,7 +44,9 @@
<filename>/run/systemd/transient/*</filename>
<filename>/run/systemd/generator.early/*</filename>
<filename>/etc/systemd/system/*</filename>
<filename>/etc/systemd/systemd.attached/*</filename>
<filename>/run/systemd/system/*</filename>
<filename>/run/systemd/systemd.attached/*</filename>
<filename>/run/systemd/generator/*</filename>
<filename>…</filename>
<filename>/usr/lib/systemd/system/*</filename>