Sometimes customer report an error which occurs with kernel package provided by L3 team (which we call PTF). To do the analysis we usually need to prepare kernel source code. That usually means to go back to maintenance update tag in git repository and apply all the patches provided in the used PTF.
We could use clones of kernel.git and kernel-source.git repositories on l3slave to store used tree and make it quickly available.
It can be implemented as ptfbuild hook for kernel packages or as script calling ptfbuild.
When build of PTF is requested, project diff would be generated (usually consists of series.conf entry, added patch to tarballs, changelog entry, ...), new branch in kernel-source.git generated, patch applied and commited. For kernel.git would be generated equivalent branch with patch as well.
With this we could provide to R&D used kernel source easily for error analysis, backporting or we could base PTFs on PTFs more quickly.
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