$ git clone -n https://src.fedoraproject.org/rpms/resalloc.git /var/lib/mock/f45-build-34455-687/root/chroot_tmpdir/scmroot/resalloc
Cloning into '/var/lib/mock/f45-build-34455-687/root/chroot_tmpdir/scmroot/resalloc'...
$ git fetch origin 961be30ea65781acd0d31f06820797a95565c22d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/resalloc
 * [new ref]         961be30ea65781acd0d31f06820797a95565c22d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 961be30 New upstream version 6.3