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Handling upstream patches with git-export-debian-patches

13 de Agosto de 2011, 0:00 , por Software Livre Brasil - | Ninguém está seguindo este artigo ainda.

These days I briefly discussed with a fellow Debian developer about how to maintain upstream patches in Debian packages with Git, what brought me to rethink a little about my current practices. What I usually do is pretty much like point 4 in Raphael's post "4 tips to maintain a “3.0 (quilt)” Debian source package in a VCS":  I make commits in the Debian packaging branch, or in a separate branch that is merged into the Debian packaging branch. Then I add the single-debian-patch option to debian/source/options so that a single Debian patch is generated, and include a patch header that points people interested in the individual changes to the public Git repository where they were originally done.

My reasoning for doing so was the following: most upstream developers will hardly care enough to come check the patches applied against their source in Debian, so it's not so important to have a clean source package with separated and explained patches. But then there is the people who will actually care about the patches: other distribution developers. Not imposing a specific VCS on them to review the patches applied in Debian is a nice thing to do.

Then I wrote a script called git-export-debian-patches (downloadmanpage), which was partly inspired by David Bremner's script. It exports all commits in the Debian packaging branch that do not touch files under debian/ and were not applied upstream to debian/patches. The script also creates an appropriate debian/patches/series files. The script is even smart enough to detect patches that were later reverted in the Debian branch and exclude them (and the commit that reverted them) from the patch list.

The advantage I see over gbp-pq is that I don't need to rebase (and thus lose history) to have a clean set of patches. The advantage over the gitpkg quilt-patches-deb-export-hook hook is that I don't need to explicitly say which ranges I want: every change that is merged in master, was not applied upstream and was not reverted gets listed as a patch. To be honest I don't have any experience with either gbp-pq or gitpkg and these advantages were based on what I read, so please leave a (nice ;-)) comment if I said something stupid.

I am looking forward to receive feedback about the tool, specially about potential corner cases in which it would break. For now I have tested it in a package with simple changes agains upstream source, and it seems fine.


Tags deste artigo: english debian packaging git git-export-debian-patches

1Um comentário

  • A3498d42ab563352a866036c812caa75?only path=false&size=50&d=404glandium(usuário não autenticado)
    14 de Agosto de 2011, 3:16

    Patch evolution

    Unfortunately, this kind of script will generate several patch files when you fix a previous fix. Or do you handle this case specifically?
    Another reason why I prefer rebasing is that upstream changes may induce conflicts. As such, only merge commits will contain the necessary fixups, and appluying the original patch will fail.
    Anyways, this probably works just fine for small packages that don't need to sit on patches for years.