$ git clone -n https://src.fedoraproject.org/rpms/libksane.git /var/lib/mock/f42-build-863735-171737/root/chroot_tmpdir/scmroot/libksane
Cloning into '/var/lib/mock/f42-build-863735-171737/root/chroot_tmpdir/scmroot/libksane'...
$ git fetch origin dd52f15f2607d790b53359a6a47ca646b35e835e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libksane
 * [new ref]         dd52f15f2607d790b53359a6a47ca646b35e835e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd52f15 fix: unify into one package and devel subpackage. Add obsoletes