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authorJosé Bollo <jose.bollo@iot.bzh>2016-10-26 18:24:13 +0200
committerJosé Bollo <jose.bollo@iot.bzh>2016-10-28 15:35:02 +0200
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-<h1 class="title">The afm-system-daemon</h1>
-<h2 class="author">José Bollo</h2>
-<h2 class="author">Fulup Ar Foll</h2>
-<h3 class="date">24 juin 2016</h3>
-</header>
-<nav id="TOC">
-<ul>
-<li><a href="#the-afm-system-daemon">The afm-system-daemon</a><ul>
-<li><a href="#foreword">Foreword</a></li>
-<li><a href="#introduction">Introduction</a></li>
-<li><a href="#starting-afm-system-daemon">Starting <strong>afm-system-daemon</strong></a></li>
-<li><a href="#the-d-bus-interface">The D-Bus interface</a><ul>
-<li><a href="#overview-of-the-dbus-interface">Overview of the dbus interface</a></li>
-<li><a href="#the-protocol-over-d-bus">The protocol over D-Bus</a></li>
-</ul></li>
-</ul></li>
-</ul>
-</nav>
-<h1 id="the-afm-system-daemon">The afm-system-daemon</h1>
-<h2 id="foreword">Foreword</h2>
-<p>This document describes application framework system daemon fundamentals. FCF (Fully Conform to Specification) implementation is still under development. It may happen that current implementation somehow diverges with specifications.</p>
-<h2 id="introduction">Introduction</h2>
-<p>The daemon <strong>afm-system-daemon</strong> is in charge of installing applications on AGL system. Its main tasks are:</p>
-<ul>
-<li><p>installs applications and setup security framework for newly installed application.</p></li>
-<li><p>uninstall applications</p></li>
-</ul>
-<p>The <strong>afm-system-daemon</strong> takes its orders from system instance of D-Bus.</p>
-<p>The figure below summarizes the situation of <strong>afm-system-daemon</strong> in the system.</p>
-<pre><code>+------------------------------------------------------------+
-| User |
-| |
-| +-------------------------------------------------+ |
-| | | |
-| | afm-user-daemon | |
-| | | |
-| +----------+----------------------+----------+----+ |
-| | | : |
-| | | : |
-:================|======================|==========:=========:
-| | | : |
-| +----------+----------+ +-----+-----+ : |
-| | D-Bus system +-----+ CYNARA | : |
-| +----------+----------+ +-----+-----+ : |
-| | | : |
-| +----------+---------+ +-------+----------+----+ |
-| | afm-system-daemon +----+ SECURITY-MANAGER | |
-| +--------------------+ +-----------------------+ |
-| |
-| System |
-+------------------------------------------------------------+</code></pre>
-<h2 id="starting-afm-system-daemon">Starting <strong>afm-system-daemon</strong></h2>
-<p><strong>afm-system-daemon</strong> is launched as a <strong>systemd</strong> service attached to system. Normally, the service file is located at /lib/systemd/system/afm-system-daemon.service.</p>
-<p>The options for launching <strong>afm-system-daemon</strong> are:</p>
-<pre><code>-r
---root directory
-
- Set the root application directory.
-
- Note that the default root directory is defined
- to be /usr/share/afm/applications (may change).
-
--d
---daemon
-
- Daemonizes the process. It is not needed by sytemd.
-
--q
---quiet
-
- Reduces the verbosity (can be repeated).
-
--v
---verbose
-
- Increases the verbosity (can be repeated).
-
--h
---help
-
- Prints a short help.</code></pre>
-<h2 id="the-d-bus-interface">The D-Bus interface</h2>
-<h3 id="overview-of-the-dbus-interface">Overview of the dbus interface</h3>
-<p><strong><em>afm-system-daemon</em></strong> takes its orders from the session instance of D-Bus. The use of D-Bus is great because it allows to implement discovery and signaling.</p>
-<p>The <strong>afm-system-daemon</strong> is listening with the destination name <strong><em>org.AGL.afm.system</em></strong> at the object of path <strong><em>/org/AGL/afm/system</em></strong> on the interface <strong><em>org.AGL.afm.system</em></strong> for the below detailed members <strong><em>install</em></strong> and <strong><em>uninstall</em></strong>.</p>
-<p>D-Bus is mainly used for signaling and discovery. Its optimized typed protocol is not used except for transmitting only one string in both directions.</p>
-<p>The client and the service are using JSON serialization to exchange data.</p>
-<p>The D-Bus interface is defined by:</p>
-<ul>
-<li><p>DESTINATION: <strong>org.AGL.afm.system</strong></p></li>
-<li><p>PATH: <strong>/org/AGL/afm/system</strong></p></li>
-<li><p>INTERFACE: <strong>org.AGL.afm.system</strong></p></li>
-</ul>
-<p>The signature of any member of the interface is <strong><em>string -&gt; string</em></strong> for <strong><em>JSON -&gt; JSON</em></strong>.</p>
-<p>This is the normal case. In case of error, the current implementation returns a dbus error that is a string.</p>
-<p>Here is an example using <em>dbus-send</em> to query data on installed applications.</p>
-<pre><code>dbus-send --session --print-reply \
- --dest=org.AGL.afm.system \
- /org/AGL/afm/system \
- org.AGL.afm.system.install &#39;string:&quot;/tmp/appli.wgt&quot;&#39;</code></pre>
-<h3 id="the-protocol-over-d-bus">The protocol over D-Bus</h3>
-<hr />
-<h4 id="method-org.agl.afm.system.install">Method org.AGL.afm.system.install</h4>
-<p><strong>Description</strong>: Install an application from a widget file.</p>
-<p>When an application with the same <em>id</em> and <em>version</em> already exists. Outside of using <em>force=true</em> the application is not reinstalled.</p>
-<p>Applications are installed the subdirectories of applications common directory. If <em>root</em> is specified, the application is installed under the sub-directories of the <em>root</em> defined.</p>
-<p>Note that this methods is a simple accessor method of <strong><em>org.AGL.afm.system.install</em></strong> from <strong><em>afm-system-daemon</em></strong>.</p>
-<p>After the installation and before returning to the sender, <strong><em>afm-system-daemon</em></strong> sends a signal <strong><em>org.AGL.afm.system.changed</em></strong>.</p>
-<p><strong>Input</strong>: The <em>path</em> of the widget file to install and, optionally, a flag to <em>force</em> reinstallation, and, optionally, a <em>root</em> directory.</p>
-<p>Either just a string being the absolute path of the widget file:</p>
-<pre><code>&quot;/a/path/driving/to/the/widget&quot;</code></pre>
-<p>Or an object:</p>
-<pre><code>{
- &quot;wgt&quot;: &quot;/a/path/to/the/widget&quot;,
- &quot;force&quot;: false,
- &quot;root&quot;: &quot;/a/path/to/the/root&quot;
-}</code></pre>
-<p>&quot;wgt&quot; and &quot;root&quot; must be absolute paths.</p>
-<p><strong>output</strong>: An object with the field &quot;added&quot; being the string for the id of the added application.</p>
-<pre><code>{&quot;added&quot;:&quot;appli@x.y&quot;}</code></pre>
-<hr />
-<h4 id="method-org.agl.afm.system.uninstall">Method org.AGL.afm.system.uninstall</h4>
-<p><strong>Description</strong>: Uninstall an application from its id.</p>
-<p>Note that this methods is a simple method accessor of <strong><em>org.AGL.afm.system.uninstall</em></strong> from <strong><em>afm-system-daemon</em></strong>.</p>
-<p>After the uninstallation and before returning to the sender, <strong><em>afm-system-daemon</em></strong> sends a signal <strong><em>org.AGL.afm.system.changed</em></strong>.</p>
-<p><strong>Input</strong>: the <em>id</em> of the application and optionally the application <em>root</em> path.</p>
-<p>Either a string:</p>
-<pre><code>&quot;appli@x.y&quot;</code></pre>
-<p>Or an object:</p>
-<pre><code>{
- &quot;id&quot;: &quot;appli@x.y&quot;,
- &quot;root&quot;: &quot;/a/path/to/the/root&quot;
-}</code></pre>
-<p><strong>output</strong>: the value 'true'.</p>
-</body>
-</html>