$ git clone -n https://src.fedoraproject.org/rpms/R-lobstr.git /var/lib/mock/f45-build-6215-347/root/chroot_tmpdir/scmroot/R-lobstr
Cloning into '/var/lib/mock/f45-build-6215-347/root/chroot_tmpdir/scmroot/R-lobstr'...
$ git fetch origin a0c8ff6e58247f24e9e96ae2e8806a214f3d8cd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-lobstr
 * [new ref]         a0c8ff6e58247f24e9e96ae2e8806a214f3d8cd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0c8ff6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild