[LEDE-DEV] Buildbot

[John Allen]

On 2016-05-10 6:14 AM, Jo-Philipp Wich wrote:
> Hi,
>
>> I may be asking a stupid question, but why does the build system have to
>> build everything every time.
> until recently this wasn't possible due to certain technical
> limitations, some of which we already addressed [1].
>
>> Under OpenWRT a typical build will take 12 - 16+ hours, of which 10+
>> will be spent building the packages. very few of which will have changed.
> Correct.
>
>> Would it be possible to split the base system and the packages into two
>> separate builds in order to speed up the build process.
> We already did that [2], also see:
> http://phase1.builds.lede-project.org/
> http://phase2.builds.lede-project.org/
>
>> Would it be possible to build only those packages that have changed. I
>> realize that if some underlying common source code has changed then all
>> the affected apps will need to be rebuilt. However, if a linked library
>> has changed why do we recompile, why not just re-link?
> Not at the moment. Implementing that would imply the ability to keep all
> build trees on disk, we currently lack the resources to do so.
>
> Another approach is to rebuild single packages (plus their dependency
> subtrees) using the SDK, then patch and re-sign the repository index
> files in-place. This is an approach I used for binary security updates
> in OpenWrt [3] but it has certain locking / race condition implications
> as multiple parallel running builders need to patch the same repository
> index files so it is rather hard to do correctly in a distributed manner.
>
> 1:
> https://git.lede-project.org/?p=source.git;a=commit;h=5170393f8cae3c5acac61bd6ac6e127f9727cee4
> 2: https://git.lede-project.org/?p=buildbot.git;a=summary
> 3: https://github.com/openwrt/buildscripts
>
> ~ Jo
>
How much space does LEDE/OpenWRT take up?