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bitbake: user-manual-intro.xml: Re-write of BitBake introduction.

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(Bitbake rev: afc998a73f09f3d1a0d7e22425badfa5b7001aa1)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Bill Traynor
2014-01-13 18:34:16 -06:00
committed by Richard Purdie
parent a713dade85
commit 3a9593d409
1 changed files with 40 additions and 15 deletions
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55
bitbake/doc/user-manual/user-manual-intro.xml
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@@ -8,21 +8,46 @@
<title>Introduction</title>
<para>
BitBake is a tool for executing tasks commonly performed by software
developers when building systems on a daily basis.
BitBake can build Systems consisting of numerous individual pieces
of software, or can be used to build a single application.
Example tasks that BitBake can execute are fetching source code,
applying patches to source code, configuring, compiling, and
packaging applications into a complete system, and managing metadata.
BitBake abstracts the information for completing individual tasks
into files known as recipes.
Recipes contain all of the relevant information required by BitBake
to complete a given task including dependencies, source file
locations, etc.
BitBake is similar to
<ulink url='http://www.gnu.org/software/make/'>GNU Make</ulink>
and other build tools.
fundamentally, BitBake is a generic task execution
engine that allows shell and Python tasks to be run
efficiently and in parallel while working within
complex inter-task dependency constraints.
One of BitBake's main users, OpenEmbedded, takes this core
and builds embedded Linux software stacks using
a task-oriented approach.
</para>
<para>
Conceptually, BitBake is similar to GNU Make in
some regards but has significant differences:
<itemizedlist>
<listitem><para>
BitBake executes tasks according to provided
metadata that builds up the tasks.
Metadata is stored in recipe (<filename>.bb</filename>),
configuration (<filename>.conf</filename>), and class
(<filename>.bbclass</filename>) files and provides
BitBake with instructions on what tasks to run and
the dependencies between those tasks.
</para></listitem>
<listitem><para>
BitBake includes a fetcher library for obtaining source
code from various places such as source control
systems or websites.
</para></listitem>
<listitem><para>
The instructions for each unit to be built (e.g. a piece
of software) are known as recipe files and
contain all the information about the unit
(dependencies, source file locations, checksums, description
and so on).
</para></listitem>
<listitem><para>
BitBake includes a client/server abstraction and can
be used from a command line or used as a service over XMLRPC and
has several different user interfaces.
</para></listitem>
</itemizedlist>
</para>
</section>