$ git clone -n https://src.fedoraproject.org/rpms/rust-simd_helpers.git /var/lib/mock/f45-build-44979-820/root/chroot_tmpdir/scmroot/rust-simd_helpers
Cloning into '/var/lib/mock/f45-build-44979-820/root/chroot_tmpdir/scmroot/rust-simd_helpers'...
$ git fetch origin 672513d86d2b529874bae32f61414afef04335a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-simd_helpers
 * [new ref]         672513d86d2b529874bae32f61414afef04335a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 672513d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild