f07a097213
This code has been unchanged since 2006 apart from attempts to optimise performance by minimising chdir() calls. There is no reason the modern bitbake parser should be changing directory all the time. We did have some path assumptions in the mists of time but those were resovled and the code is deterministic and doesn't depend on cwd now for parsing. We can therefore drop the changes in directory. Also, TOPDIR is now being set by cookerdata in all cases so we don't need the fallbacks in this code (which was used to effectively initialise a value). We don't need to change TOPDIR when parsing a recipe, that makes no sense. If we stop all the other messing around, we don't need to expand TMPDIR either. These changes have the potential to break some obscure use cases such as an anonymous function assuming the current working directory, or some case which depends on TOPDIR changing but I believe any such uses should be fixed at this point. (Bitbake rev: add5d488e1d6607a98441836075d01cb1dc9c0fa) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Bitbake
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.
For information about Bitbake, see the OpenEmbedded website: https://www.openembedded.org/
Bitbake plain documentation can be found under the doc directory or its integrated html version at the Yocto Project website: https://docs.yoctoproject.org
Contributing
Please refer to https://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded for guidelines on how to submit patches, just note that the latter documentation is intended for OpenEmbedded (and its core) not bitbake patches (bitbake-devel@lists.openembedded.org) but in general main guidelines apply. Once the commit(s) have been created, the way to send the patch is through git-send-email. For example, to send the last commit (HEAD) on current branch, type:
git send-email -M -1 --to bitbake-devel@lists.openembedded.org
Mailing list:
https://lists.openembedded.org/g/bitbake-devel
Source code:
https://git.openembedded.org/bitbake/
Testing:
Bitbake has a testsuite located in lib/bb/tests/ whichs aim to try and prevent regressions. You can run this with "bitbake-selftest". In particular the fetcher is well covered since it has so many corner cases. The datastore has many tests too. Testing with the testsuite is recommended before submitting patches, particularly to the fetcher and datastore. We also appreciate new test cases and may require them for more obscure issues.