.. highlight:: rst

.. _scevtlog:

########
scevtlog
########

**Event log preserving the history of updates.**


Description
===========

Running SeisComP causes many database accesses for writing. Anytime a new
event has been created a new row will be inserted in the database table.
When the same event is updated the row in the database table is going to be
changed as well. The information about the history of the event is lost because
the database contains only the current event attributes. scevtlog saves the
event history into files. While scevtlog is running it keeps the track of all
event updates and stores this information in a directory that can be analyzed
at anytime. The stored information is written as plain text in an easily
readable format. Additionally scevtlog maintains an event summary file for an
overview of the event history.


.. _scevtlog_configuration:

Module Configuration
====================

| :file:`etc/defaults/global.cfg`
| :file:`etc/defaults/scevtlog.cfg`
| :file:`etc/global.cfg`
| :file:`etc/scevtlog.cfg`
| :file:`~/.seiscomp/global.cfg`
| :file:`~/.seiscomp/scevtlog.cfg`

scevtlog inherits :ref:`global options<global-configuration>`.



.. confval:: directory

   Default: ``@LOGDIR@/events``

   Type: *string*

   Specify the output directory. Within this directory the logging
   directory structure and the event files are stored.


.. confval:: format

   Default: ``xml``

   Type: *string*

   Specify output event format \(default is autoloc3\). For completeness
   it is recommended to switch to xml as storage format. The autoloc3
   format can be easily reconstructed with scbulletin but not the other
   way around.


.. confval:: gzip

   Default: ``false``

   Type: *boolean*

   If format is xml then all XML files will be compressed with gzip
   and stored with file extension \".xml.gz\". They are also
   valid gzip files and can be used as input to e.g. zgrep.



Command-Line Options
====================

.. program:: scevtlog

:program:`scevtlog [options]`


Generic
-------

.. option:: -h, --help

   Show help message.

.. option:: -V, --version

   Show version information.

.. option:: --config-file arg

   Use alternative configuration file. When this option is
   used the loading of all stages is disabled. Only the
   given configuration file is parsed and used. To use
   another name for the configuration create a symbolic
   link of the application or copy it. Example:
   scautopick \-> scautopick2.

.. option:: --plugins arg

   Load given plugins.

.. option:: -D, --daemon

   Run as daemon. This means the application will fork itself
   and doesn't need to be started with \&.

.. option:: --auto-shutdown arg

   Enable\/disable self\-shutdown because a master module shutdown.
   This only works when messaging is enabled and the master
   module sends a shutdown message \(enabled with \-\-start\-stop\-msg
   for the master module\).

.. option:: --shutdown-master-module arg

   Set the name of the master\-module used for auto\-shutdown.
   This is the application name of the module actually
   started. If symlinks are used, then it is the name of
   the symlinked application.

.. option:: --shutdown-master-username arg

   Set the name of the master\-username of the messaging
   used for auto\-shutdown. If \"shutdown\-master\-module\" is
   given as well, this parameter is ignored.


Verbosity
---------

.. option:: --verbosity arg

   Verbosity level [0..4]. 0:quiet, 1:error, 2:warning, 3:info,
   4:debug.

.. option:: -v, --v

   Increase verbosity level \(may be repeated, eg. \-vv\).

.. option:: -q, --quiet

   Quiet mode: no logging output.

.. option:: --component arg

   Limit the logging to a certain component. This option can
   be given more than once.

.. option:: -s, --syslog

   Use syslog logging backend. The output usually goes to
   \/var\/lib\/messages.

.. option:: -l, --lockfile arg

   Path to lock file.

.. option:: --console arg

   Send log output to stdout.

.. option:: --debug

   Execute in debug mode.
   Equivalent to \-\-verbosity\=4 \-\-console\=1 .

.. option:: --log-file arg

   Use alternative log file.


Messaging
---------

.. option:: -u, --user arg

   Overrides configuration parameter :confval:`connection.username`.

.. option:: -H, --host arg

   Overrides configuration parameter :confval:`connection.server`.

.. option:: -t, --timeout arg

   Overrides configuration parameter :confval:`connection.timeout`.

.. option:: -g, --primary-group arg

   Overrides configuration parameter :confval:`connection.primaryGroup`.

.. option:: -S, --subscribe-group arg

   A group to subscribe to.
   This option can be given more than once.

.. option:: --content-type arg

   Overrides configuration parameter :confval:`connection.contentType`.

.. option:: --start-stop-msg arg

   Set sending of a start and a stop message.


Database
--------

.. option:: --db-driver-list

   List all supported database drivers.

.. option:: -d, --database arg

   The database connection string, format:
   service:\/\/user:pwd\@host\/database.
   \"service\" is the name of the database driver which
   can be queried with \"\-\-db\-driver\-list\".

.. option:: --config-module arg

   The config module to use.

.. option:: --inventory-db arg

   Load the inventory from the given database or file, format:
   [service:\/\/]location .

.. option:: --db-disable

   Do not use the database at all


Storage
-------

.. option:: -o, --directory arg

   Overrides configuration parameter :confval:`directory`.

.. option:: -f, --format arg

   Overrides configuration parameter :confval:`format`.

