Difference between revisions of "BitBake (dev)"
From Openembedded.org
m (adding to developer category) |
(→"Helloworld" using bb library) |
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== "Helloworld" using bb library == | == "Helloworld" using bb library == | ||
+ | |||
+ | === Simplest === | ||
<pre> | <pre> | ||
Line 24: | Line 26: | ||
</pre> | </pre> | ||
− | + | === with data module === | |
<pre> | <pre> | ||
Line 43: | Line 45: | ||
</pre> | </pre> | ||
+ | data module is well documented because it uses doctest. | ||
+ | |||
+ | === with persist_data module === | ||
+ | |||
+ | Now you want persistant data to exchange data between threads/tasks. | ||
+ | This can be done using bb.persist_data module that uses sqlite via pyslite2. | ||
+ | |||
+ | <pre> | ||
+ | #!/usr/bin/env python | ||
+ | # ex:ts=4:sw=4:sts=4:et | ||
+ | # -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- | ||
+ | |||
+ | import bb, os, sys | ||
+ | from bb import data, persist_data, fetch | ||
+ | |||
+ | __version__ = "0.0.1" | ||
+ | |||
+ | def main(): | ||
+ | """ | ||
+ | The main Method | ||
+ | """ | ||
+ | |||
+ | # persist_data module need debug_level to be set | ||
+ | bb.msg.set_debug_level(0) | ||
+ | |||
+ | # init a data with PERSISTENT_DIR to set where the data will be saved | ||
+ | d = data.init() | ||
+ | data.setVar('PERSISTENT_DIR', os.getcwd(), d) | ||
+ | |||
+ | # create persist_data base in bb_persist_data.sqlite3 | ||
+ | pd = persist_data.PersistData(d) | ||
+ | |||
+ | # create a sql table | ||
+ | pd.addDomain("MYBASE") | ||
+ | |||
+ | # add a data in this table | ||
+ | pd.setValue( "MYBASE", "TOTO", "hello world!") | ||
+ | |||
+ | # print it | ||
+ | val = pd.getValue ( "MYBASE", "TOTO") | ||
+ | print val | ||
+ | |||
+ | if __name__ == '__main__': | ||
+ | main() | ||
+ | |||
+ | </pre> | ||
[[Category:Dev]] | [[Category:Dev]] |
Revision as of 16:17, 2 October 2008
developer homepage
- First , RTFM ;-) : http://bitbake.berlios.de/manual/
- Don't forget mailinglist :
- Best documentation for source is via python documentation system.
Contents
Tutorial
This tutorial focus bitbake developement, not bbclass or openembedded developement that is documented elsewhere.
"Helloworld" using bb library
Simplest
#!/usr/bin/env python # ex:ts=4:sw=4:sts=4:et # -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- import bb version = bb.__version__ bb.note("Hello from helloworld using lib bb v%s." % ( version ))
with data module
#!/usr/bin/env python # ex:ts=4:sw=4:sts=4:et # -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- import os , bb from bb import data hello = ("Hello from helloworld using lib bb v%s." % ( bb.__version__ )) d = data.init() data.setVar('HELLO_MSG', hello, d) mystring = data.getVar('HELLO_MSG', d, 1) bb.note(mystring)
data module is well documented because it uses doctest.
with persist_data module
Now you want persistant data to exchange data between threads/tasks. This can be done using bb.persist_data module that uses sqlite via pyslite2.
#!/usr/bin/env python # ex:ts=4:sw=4:sts=4:et # -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- import bb, os, sys from bb import data, persist_data, fetch __version__ = "0.0.1" def main(): """ The main Method """ # persist_data module need debug_level to be set bb.msg.set_debug_level(0) # init a data with PERSISTENT_DIR to set where the data will be saved d = data.init() data.setVar('PERSISTENT_DIR', os.getcwd(), d) # create persist_data base in bb_persist_data.sqlite3 pd = persist_data.PersistData(d) # create a sql table pd.addDomain("MYBASE") # add a data in this table pd.setValue( "MYBASE", "TOTO", "hello world!") # print it val = pd.getValue ( "MYBASE", "TOTO") print val if __name__ == '__main__': main()