Comment 2 for bug 1706979

This isn't a bug, it's a feature request.

build-source doesn't currently take a treeish argument. So to reproduce:

git ubuntu clone something
cd something
add a changelog entry and commit it
git checkout pkg/ubuntu/trusty-devel # (say)
git ubuntu build-source ubuntu/devel

This fails because build-source doesn't understand ubuntu/devel and passes it to dpkg-buildpackage, but even if it didn't, it would build the source for pkg/ubuntu/trusty-devel instead of ubuntu/devel.