$ git clone -n https://src.fedoraproject.org/rpms/gnome-mines.git /var/lib/mock/f42-build-side-1-3498251-45962/root/chroot_tmpdir/scmroot/gnome-mines
Cloning into '/var/lib/mock/f42-build-side-1-3498251-45962/root/chroot_tmpdir/scmroot/gnome-mines'...
$ git fetch origin 66bb3953ea73039d59cba8eef6f553905e7c0254:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-mines
 * [new ref]         66bb3953ea73039d59cba8eef6f553905e7c0254 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66bb395 Update to 48.1