$ git clone -n https://src.fedoraproject.org/rpms/bltk.git /var/lib/mock/f41-build-1057133-19395/root/chroot_tmpdir/scmroot/bltk
Cloning into '/var/lib/mock/f41-build-1057133-19395/root/chroot_tmpdir/scmroot/bltk'...
$ git fetch origin eb40d38e801e2df13a4109a05845f95ad6e0c7f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bltk
 * [new ref]         eb40d38e801e2df13a4109a05845f95ad6e0c7f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb40d38 Eliminate use of obsolete %patchN syntax (#2283636)