$ git clone -n https://src.fedoraproject.org/rpms/rust-number_prefix.git /var/lib/mock/f45-build-43497-803/root/chroot_tmpdir/scmroot/rust-number_prefix
Cloning into '/var/lib/mock/f45-build-43497-803/root/chroot_tmpdir/scmroot/rust-number_prefix'...
$ git fetch origin 82c69ae887e17d2a6d04595eda9345d12da20054:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-number_prefix
 * [new ref]         82c69ae887e17d2a6d04595eda9345d12da20054 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82c69ae Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild