$ git clone -n https://src.fedoraproject.org/rpms/fstrm.git /var/lib/mock/f45-build-9313-401/root/chroot_tmpdir/scmroot/fstrm
Cloning into '/var/lib/mock/f45-build-9313-401/root/chroot_tmpdir/scmroot/fstrm'...
$ git fetch origin 33e0dd6efba41a5695f76b24772f1148ceb1fb90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fstrm
 * [new ref]         33e0dd6efba41a5695f76b24772f1148ceb1fb90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 33e0dd6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild