$ git clone -n https://src.fedoraproject.org/rpms/rust-krates.git /var/lib/mock/f45-build-42789-796/root/chroot_tmpdir/scmroot/rust-krates
Cloning into '/var/lib/mock/f45-build-42789-796/root/chroot_tmpdir/scmroot/rust-krates'...
$ git fetch origin 9aa6e626fb51a5052ab157badca87071044041a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-krates
 * [new ref]         9aa6e626fb51a5052ab157badca87071044041a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9aa6e62 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild