$ git clone -n https://src.fedoraproject.org/rpms/rust-safe_arch.git /var/lib/mock/f45-build-44670-816/root/chroot_tmpdir/scmroot/rust-safe_arch
Cloning into '/var/lib/mock/f45-build-44670-816/root/chroot_tmpdir/scmroot/rust-safe_arch'...
$ git fetch origin 34e06b115f15fa605c18e8cfc1ef45feb2f4bc34:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-safe_arch
 * [new ref]         34e06b115f15fa605c18e8cfc1ef45feb2f4bc34 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34e06b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild