Please add a git archive method

[pini-edf]

Hi,
We use jenkins-debian-glue at $work, but because we handle some very large source packages (up to 25 Go) we don't want jenkins to fetch every ref. This could lead to several hundred of Go transiting through the network, while with only need a few Go to build the source package.
How about introducing a new git backend with these 2 parameters ?

• repo URI
• refspec to build the source package from
  This backend would first 'git archive' the given refspec only, then build the source package using dpkg-source instead of gbp.
  Thanks in advance.

[mika]

Hi! I'm definitely open for such ideas, I have a similar situation at a customer of mine, who has tons of gerrit reviews in many repositories, we use a customized *-source there, using command lines like git fetch --tags --progress "${GIT_URL}" +"refs/changes/${git_ref_id}:refs/remotes/origin/${git_ref_id}" to get the relevant data.

Note: the dpkg-source approach will probably only for native packages (https://www.debian.org/doc/manuals/maint-guide/first.en.html#non-native-dh-make), otherwise the orig.tar.* files will be missing (that's something gbp can take care of).

If you're interested in working on a PR I'd be more than happy to provide feedback!