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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">
<erlref>
<header>
<copyright>
<year>2014</year><year>2016</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
</legalnotice>
<title></title>
<prepared></prepared>
<responsible></responsible>
<docno>1</docno>
<approved></approved>
<checked></checked>
<date></date>
<rev></rev>
<file>system_information.xml</file>
</header>
<module since="OTP 17.0">system_information</module>
<modulesummary>System Information</modulesummary>
<description>
<p></p>
</description>
<funcs>
<func>
<name name="sanity_check" arity="0" since="OTP 17.0"/>
<fsummary>Perform a sanity check</fsummary>
<desc>
<p>Performs a sanity check on the system. If no issues
were found, <c>ok</c> is returned. If issues were
found, <c>{failed, <anno>Failures</anno>}</c> is
returned. All failures found will be part of the
<c><anno>Failures</anno></c> list. Currently defined
<c><anno>Failure</anno></c> elements in the
<c><anno>Failures</anno></c> list:</p>
<taglist>
<tag><c><anno>InvalidAppFile</anno></c></tag>
<item><p>An application has an invalid <c>.app</c> file. The
second element identifies the application which has the
invalid <c>.app</c> file.</p></item>
<tag><c><anno>InvalidApplicationVersion</anno></c></tag>
<item><p>An application has an invalid application version.
The second element identifies the application version that
is invalid.</p></item>
<tag><c><anno>MissingRuntimeDependencies</anno></c></tag>
<item><p>An application is missing
<seealso marker="kernel:app#runtime_dependencies">runtime
dependencies</seealso>. The second element identifies the
application (with version) that has missing dependencies.
The third element contains the missing dependencies.</p>
<p>Note that this check use application versions that
are loaded, or will be loaded when used. You might have
application versions that satisfies all dependencies
installed in the system, but if those are not loaded this
check will fail. The system will of course also fail when
used like this. This may happen when you have multiple
<seealso marker="doc/system_principles:versions">branched
versions</seealso> of the same application installed in the
system, but you do not use a
<seealso marker="doc/system_principles:system_principles#BOOTSCRIPT">boot
script</seealso> identifing the correct application version.</p>
</item>
</taglist>
<p>Currently the sanity check is limited to verifying
runtime dependencies found in the <c>.app</c> files of
all applications. More checks will be introduced in the
future. This implies that the return type <em>will</em>
change in the future.</p>
<note><p>An <c>ok</c> return value only means that
<c>sanity_check/0</c> did not find any issues, <em>not</em>
that no issues exist.</p></note>
</desc>
</func>
<func>
<name name="to_file" arity="1" since="OTP 17.0"/>
<fsummary>Write miscellaneous system information to file</fsummary>
<desc><p>Writes miscellaneous system information to file. This
information will typically be requested by the Erlang/OTP team
at Ericsson AB when reporting an issue.</p></desc>
</func>
</funcs>
</erlref>
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