$ git clone -n https://src.fedoraproject.org/rpms/xsimd.git /var/lib/mock/f45-build-39105-732/root/chroot_tmpdir/scmroot/xsimd
Cloning into '/var/lib/mock/f45-build-39105-732/root/chroot_tmpdir/scmroot/xsimd'...
$ git fetch origin a0e2b07267c63dfece5534b2df15bdc635607c41:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xsimd
 * [new ref]         a0e2b07267c63dfece5534b2df15bdc635607c41 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0e2b07 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild