<corpauthor>BitBake Team</corpauthor>
</authorgroup>
<copyright>
- <year>2004, 2005</year>
+ <year>2004, 2005, 2006</year>
<holder>Chris Larson</holder>
<holder>Phil Blundell</holder>
</copyright>
<legalnotice>
- <para>This work is licensed under the Creative Commons Attribution License. To view a copy of this license, visit <ulink url="http://creativecommons.org/licenses/by/2.0/">http://creativecommons.org/licenses/by/2.0/</ulink> or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.</para>
+ <para>This work is licensed under the Creative Commons Attribution License. To view a copy of this license, visit <ulink url="http://creativecommons.org/licenses/by/2.5/">http://creativecommons.org/licenses/by/2.5/</ulink> or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.</para>
</legalnotice>
</bookinfo>
<chapter>
<section>
<title>Appending (.=) and prepending (=.) without spaces</title>
<para><screen><varname>B</varname> = "bval"
-<varname>B</varname> += "additionaldata"
+<varname>B</varname> .= "additionaldata"
<varname>C</varname> = "cval"
-<varname>C</varname> =+ "test"</screen></para>
+<varname>C</varname> =. "test"</screen></para>
<para>In this example, <varname>B</varname> is now <literal>bvaladditionaldata</literal> and <varname>C</varname> is <literal>testcval</literal>. In contrast to the above Appending and Prepending operators no additional space
will be introduced.</para>
</section>
<section>
<title>Events</title>
<para><emphasis>NOTE:</emphasis> This is only supported in .bb and .bbclass files.</para>
- <para>BitBake also implements a means of registering event handlers. Events are triggered at certain points during operation, such as, the beginning of operation against a given .bb, the start of a given task, task failure, task success, et cetera. The intent was to make it easy to do things like email notifications on build failure.</para>
+ <para>BitBake allows to install event handlers. Events are triggered at certain points during operation, such as, the beginning of operation against a given .bb, the start of a given task, task failure, task success, et cetera. The intent was to make it easy to do things like email notifications on build failure.</para>
<para><screen>addhandler myclass_eventhandler
python myclass_eventhandler() {
from bb.event import NotHandled, getName
print "The file we run for is %s" % data.getVar('FILE', e.data, True)
return NotHandled
+}
</screen></para><para>
This event handler gets called every time an event is triggered. A global variable <varname>e</varname> is defined. <varname>e</varname>.data contains an instance of bb.data. With the getName(<varname>e</varname>)
method one can get the name of the triggered event.</para><para>The above event handler prints the name
</section>
</section>
</chapter>
+
+ <chapter>
+ <title>File Download support</title>
+ <section>
+ <title>Overview</title>
+ <para>BitBake provides support to download files this procedure is called fetching. The SRC_URI is normally used to indicate BitBake which files to fetch. The next sections will describe th available fetchers and the options they have. Each Fetcher honors a set of Variables and
+a per URI parameters separated by a <quote>;</quote> consisting of a key and a value. The semantic of the Variables and Parameters are defined by the Fetcher. BitBakes tries to have a consistent semantic between the different Fetchers.
+ </para>
+ </section>
+
+ <section>
+ <title>Local File Fetcher</title>
+ <para>The URN for the Local File Fetcher is <emphasis>file</emphasis>. The filename can be either absolute or relative. If the filename is relative <varname>FILESPATH</varname> and <varname>FILESDIR</varname> will be used to find the appropriate relative file depending on the <varname>OVERRIDES</varname>. Single files and complete directories can be specified.
+<screen><varname>SRC_URI</varname>= "file://relativefile.patch"
+<varname>SRC_URI</varname>= "file://relativefile.patch;this=ignored"
+<varname>SRC_URI</varname>= "file:///Users/ich/very_important_software"
+</screen>
+ </para>
+ </section>
+
+ <section>
+ <title>CVS File Fetcher</title>
+ <para>The URN for the CVS Fetcher is <emphasis>cvs</emphasis>. This Fetcher honors the variables <varname>DL_DIR</varname>, <varname>SRCDATE</varname>, <varname>FETCHCOMMAND_cvs</varname>, <varname>UPDATECOMMAND_cvs</varname>. <varname>DL_DIRS</varname> specifies where a temporary checkout is saved, <varname>SRCDATE</varname> specifies which date to use when doing the fetching, <varname>FETCHCOMMAND</varname> and <varname>UPDATECOMMAND</varname> specify which executables should be used when doing the CVS checkout or update.
+ </para>
+ <para>The supported Parameters are <varname>module</varname>, <varname>tag</varname>, <varname>date</varname>, <varname>method</varname>, <varname>localdir</varname>, <varname>rsh</varname>. The <varname>module</varname> specifies which module to check out, the <varname>tag</varname> describes which CVS TAG should be used for the checkout by default the TAG is empty. A <varname>date</varname> can be specified to override the SRCDATE of the configuration to checkout a specific date. <varname>method</varname> is by default <emphasis>pserver</emphasis>, if <emphasis>ext</emphasis> is used the <varname>rsh</varname> parameter will be evaluated and <varname>CVS_RSH</varname> will be set. Finally <varname>localdir</varname> is used to checkout into a special directory relative to <varname>CVSDIR></varname>.
+<screen><varname>SRC_URI</varname> = "cvs://CVSROOT;module=mymodule;tag=some-version;method=ext"
+<varname>SRC_URI</varname> = "cvs://CVSROOT;module=mymodule;date=20060126;localdir=usethat"
+</screen>
+ </para>
+ </section>
+
+ <section>
+ <title>HTTP/FTP Fetcher</title>
+ <para>The URNs for the HTTP/FTP are <emphasis>http</emphasis>, <emphasis>https</emphasis> and <emphasis>ftp</emphasis>. This Fetcher honors the variables <varname>DL_DIR</varname>, <varname>FETCHCOMMAND_wget</varname>, <varname>PREMIRRORS</varname>, <varname>MIRRORS</varname>. The <varname>DL_DIR</varname> defines where to store the fetched file, <varname>FETCHCOMMAND</varname> contains the command used for fetching. <quote>${URI}</quote> and <quote>${FILES}</quote> will be replaced by the uri and basename of the to be fetched file. <varname>PREMIRRORS</varname>
+will be tried first when fetching a file if that fails the actual file will be tried and finally all <varname>MIRRORS</varname> will be tried.
+ </para>
+ <para>The only supported Parameter is <varname>md5sum</varname>. After a fetch the <varname>md5sum</varname> of the file will be calculated and the two sums will be compared.
+ </para>
+ <para><screen><varname>SRC_URI</varname> = "http://oe.handhelds.org/not_there.aac;md5sum=12343"
+<varname>SRC_URI</varname> = "ftp://oe.handhelds.org/not_there_as_well.aac;md5sum=1234"
+<varname>SRC_URI</varname> = "ftp://you@oe.handheld.sorg/home/you/secret.plan;md5sum=1234"
+</screen></para>
+ </section>
+
+ <section>
+ <title>SVK Fetcher</title>
+ <para>
+ <emphasis>Currently NOT suppoered</emphasis>
+ </para>
+ </section>
+
+ <section>
+ <title>SVN Fetcher</title>
+ <para>The URN for the SVN Fetcher is <emphasis>svn</emphasis>.
+ </para>
+ <para>The Variables <varname>FETCHCOMMAND_svn</varname>, <varname>DL_DIR</varname> are used by the SVN Fetcher. <varname>FETCHCOMMAND</varname> contains the subversion command, <varname>DL_DIR</varname> is the directory where tarballs will be saved.
+ </para>
+ <para>The supported Parameters are <varname>proto</varname>, <varname>rev</varname>. <varname>proto</varname> is the subversion prototype, <varname>rev</varname> is the subversions revision.
+ </para>
+ <para><screen><varname>SRC_URI</varname> = "svn://svn.oe.handhelds.org/svn;module=vip;proto=http;rev=667"
+<varname>SRC_URI</varname> = "svn://svn.oe.handhelds.org/svn/;module=opie;proto=svn+ssh;date=20060126"
+</screen></para>
+ </section>
+
+ <section>
+ <title>GIT Fetcher</title>
+ <para>The URN for the GIT Fetcher is <emphasis>git</emphasis>.
+ </para>
+ <para>The Variables <varname>DL_DIR</varname>, <varname>GITDIR</varname> are used. <varname>DL_DIR</varname> will be used to store the checkedout version. <varname>GITDIR</varname> will be used as the base directory where the git tree is cloned to.
+ </para>
+ <para>The Parameters are <emphasis>tag</emphasis>, <emphasis>protocol</emphasis>. <emphasis>tag</emphasis> is a git tag, the default is <quote>master</quote>. <emphasis>protocol</emphasis> is the git protocol to use and defaults to <quote>rsync</quote>.
+ </para>
+ <para><screen><varname>SRC_URI</varname> = "git://git.oe.handhelds.org/git/vip.git;tag=version-1"
+<varname>SRC_URI</varname> = "git://git.oe.handhelds.org/git/vip.git;protocol=http"
+ </screen></para>
+ </section>
+
+ </chapter>
+
+
<chapter>
<title>Commands</title>
<section>
cannot be remade, the other dependencies of these
targets can be processed all the same.
-f, --force force run of specified cmd, regardless of stamp status
- -i, --interactive drop into the interactive mode.
+ -i, --interactive drop into the interactive mode also called the BitBake
+ shell.
-c CMD, --cmd=CMD Specify task to execute. Note that this only executes
the specified task for the providee and the packages
it depends on, i.e. 'compile' does not implicitly call
stage for the dependencies (IOW: use only if you know
- what you are doing)
+ what you are doing). Depending on the base.bbclass a
+ listtaks tasks is defined and will show available
+ tasks
-r FILE, --read=FILE read the specified file before bitbake.conf
-v, --verbose output more chit-chat to the terminal
- -D, --debug Increase the debug level
+ -D, --debug Increase the debug level. You can specify this more
+ than once.
-n, --dry-run don't execute, just go through the motions
-p, --parse-only quit after parsing the BB files (developers only)
-d, --disable-psyco disable using the psyco just-in-time compiler (not
-s, --show-versions show current and preferred versions of all packages
-e, --environment show the global or per-package environment (this is
what used to be bbread)
+ -g, --graphviz emit the dependency trees of the specified packages in
+ the dot syntax
+ -I IGNORED_DOT_DEPS, --ignore-deps=IGNORED_DOT_DEPS
+ Stop processing at the given list of dependencies when
+ generating dependency graphs. This can help to make
+ the graph more appealing
</screen>
</para>
<screen><prompt>$ </prompt>bitbake virtual/whatever</screen>
<screen><prompt>$ </prompt>bitbake -c clean virtual/whatever</screen>
</example>
+ <example>
+ <title>Generating dependency graphs</title>
+ <para>BitBake is able to generate dependency graphs using the dot syntax. These graphs can be converted
+to images using the <application>dot</application> application from <ulink url="http://www.graphviz.org">graphviz</ulink>.
+Three files will be written into the current working directory, <emphasis>depends.dot</emphasis> containing <varname>DEPENDS</varname> variables, <emphasis>rdepends.dot</emphasis> containing <varname>RDEPENDS</varname> and <emphasis>alldepends.dot</emphasis> containing all depends. To stop depending on common depends one can use the <prompt>-I depend</prompt> to omit these from the graph. This can lead to more readable graphs.</para>
+ <screen><prompt>$ </prompt>bitbake -g blah</screen>
+ <screen><prompt>$ </prompt>bitbake -g -I virtual/whatever -I bloom blah</screen>
+ </example>
</para>
</section>
<section>
<title>Depending on another .bb</title>
<para>a.bb:
<screen>PN = "package-a"
- DEPENDS += "package-b"</screen>
+DEPENDS += "package-b"</screen>
</para>
<para>b.bb:
<screen>PN = "package-b"</screen>
projects / vuplus_bitbake / blobdiff