$ git clone -n https://src.fedoraproject.org/rpms/erlang-kvc.git /var/lib/mock/f42-build-3314910-41426/root/chroot_tmpdir/scmroot/erlang-kvc
Cloning into '/var/lib/mock/f42-build-3314910-41426/root/chroot_tmpdir/scmroot/erlang-kvc'...
$ git fetch origin 90f52214ff9677e8238f1617c5d7ea5fabfd4392:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/erlang-kvc
 * [new ref]         90f52214ff9677e8238f1617c5d7ea5fabfd4392 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90f5221 Cosmetic changes