From: Stefan Pluecken Date: Thu, 31 Jul 2008 09:02:17 +0000 (+0000) Subject: small introdution to the defaults handlers (could still be subject to X-Git-Url: http://code.vuplus.com/gitweb/?p=vuplus_dvbapp;a=commitdiff_plain;h=62d86f1ac67bfd0391922d766fa62a1849f5ddb4 small introdution to the defaults handlers (could still be subject to change) --- diff --git a/doc/DEFAULTS b/doc/DEFAULTS new file mode 100644 index 0000000..b61696f --- /dev/null +++ b/doc/DEFAULTS @@ -0,0 +1,116 @@ +Contents: +1) What is a default? +2) Where are defaults used? +3) How do you build a default? +4) What are the contents of an .info file? +5) What about .dmpkg files? +6) Details about the default types + +1) What is a default? + +A default can consist of one or many of the following: +- skins +- lamedbs +- config files +- favourite files +- ipk packages + +2) Where are defaults used? +There are several places, where defaults are used. Some require user interaction and some don't. +- First of all an "image default" is installed, when you start e2 for the first time. No user interaction is needed for that. +- After that e2 tries to mount a "preset partion" (also called "dealer partition"). If this partition contains defaults, + the user is presented with a list of these defaults and can choose to install/not install each of these defaults. +- You can create ".dmpkg files" and put them on a SD card (or something, that will be given to the FileScanner. +- The default satlists feature uses defaults. + +3) How do you build a default? +A default contains at least an .info file (see next section for details). The .info file contains meta information about data, +that this default consists of. Furthermore the default can contain the data, you wish to install (skin, lamedbs etc.). The data +can also lie on some http server. + +4) What are the contents of an .info file? +The .info file is an XMl file containing meta information about what this default contains. The basic structure +is as follows: + + + ... + + + ... + + + ... + + + +Prerequisites can be used globally for this default (as seen in the sketch above) or in the area for specific files +(see below for details). Prerequisites can have the following tags: + (e.g. boxtype "dm8000") + (e.g. DVB-S, DVB-T, DVB-C) + (e.g. 192 for Astra 19.2E) + +Used in the global section of the .info file, the default can ONLY be installed if ALL prerequisites are fulfilled. Something +similar applies to the use of prerequisites in the section. But in contrary to not being able to install the whole +default, the prerequisites in the section can only exclude distinct entries. For example, you have a lamedb +containing only services and transponders for Astra 19.2E and this is the only stuff in your default. Then you would define +a in the global section, so that cable or terrestrial boxes don't get the possibility for the +useless default and use a whith the tag for the lamedb with the 19.2 transponders/services. + +The tag must contain a tag and can (but should!) contain an tag: + + Dream Multimedia GmbH + Dream Multimedia Default + +The tag is presented to the user as the name for the default to install. + +The tag can contain several tags. Each tag must have "type" and a "name" attribute and can have a directory +attribute which is the directory relative to the .info file, where the file in the "name" attribute is stored (exception: +type="skin" => "name" is the description of the skin, since skins are always stored in whole directories, not single files). +The "type" attribute can be "skin", "config", "services", "favourites" or "package". +A short example for every type: + + + + + + + +As mentioned above, each tag can have it's own prerequisites. An example for a lamedb, containing only transponders for Astra +19.2 would be: + + + + + + +So this would only install the lamedb.192 file, if you have a DVB-S NIM in your box AND some of the tuners is configured to 19.2. + +5) What about .dmpkg files? +.dmpkg files are nothing else than tar'ed defaults. You can also use gzipped tars. + +6) Details about the default types +- "image default" + An image default is stored in /usr/share/enigma2/defaults. You can have several defaults at the same time, but you should keep + in mind, that these defaults are all installed without user interaction. So defaults with contrary contents should be avoided + (e.g. setting a default parameter in one settings file an setting another setting for the same parameter in another could lead + to unexpected behaviour, since the installation order is undetermined and completely random. so use prerequisites insted) + The "image default" is also used to set box specific config elements (for example show the new RC on a dm8000) and install the + default bouquets. +- The "preset partition" defaults are stored in /usr/share/enigma2/dealer or in an mtd partition which must be calles "preset partition". + The user is presented a list of the names of the installable + (installable means, that all prerequisites in the global section are met) defaults and can choose the defaults to install. + This can be used for customizing a users box. For example, a dealer can put in a skin, the settings for the user's sat dish etc. + into the preset partition. This partition will not be overwritten by an original Dream image. So if the user installs a new image + from the Dream website, the default settings are presented to the user in the start wizard of the new image. +- .dmpkg Packages are already explained in detail. This could be used to easily distribute update for packages (e.g. the e2 core package) + for quick hotfixes on boxes without internet connection. The advantage over normal .ipk packages is, that one .dmpkg package + can contain more than one .ipk package. +- Default satlists are stored either in the "image default"-directory or in the "preset partition" directory. The satlists must contain a + tag in the global tag: + + + + + + Only if this tag is present, the user get's this default presented in the default satlist selection (and nowhere else!). +