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bitbake: bitbake-user-manual-metadata.xml: Adding some flag examples.

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As long as i've understood everything correctly, this is just
throwing in some physical examples of a couple concepts.

(Bitbake rev: a18cc69c2fef6484a6acd78ea008d1da71198e68)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Robert P. J. Day 2014-07-10 10:12:09 +03:00 committed by Richard Purdie
parent e83032ce0a
commit 49627bbad3
1 changed files with 24 additions and 1 deletions
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25
bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml
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@ -293,6 +293,17 @@
The flags are immediately set to "abc" and "123", respectively.
The <filename>a</filename> flag becomes "abc456".
</para>
<para>
No need exists to pre-define variable flags.
You can simply start using them.
One extremely common application
is to attach some brief documentation to a BitBake variable as
follows:
<literallayout class='monospaced'>
CACHE[doc] = "The directory holding the cache of the metadata."
</literallayout>
</para>
</section>
<section id='inline-python-variable-expansion'>
@ -306,7 +317,19 @@
DATE = "${@time.strftime('%Y%m%d',time.gmtime())}"
</literallayout>
This example results in the <filename>DATE</filename>
variable becoming the current date.
variable being set to the current date.
</para>
<para>
Probably the most common use of this feature is to extract
the value of variables from BitBake's internal data dictionary,
<filename>d</filename>.
The following lines select the values of a package name
and its version number, respectively:
<literallayout class='monospaced'>
PN = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE'),d)[0] or 'defaultpkgname'}"
PV = "${@bb.parse.BBHandler.vars_from_file(d.getVar('FILE'),d)[1] or '1.0'}"
</literallayout>
</para>
</section>