$ git clone -n https://src.fedoraproject.org/rpms/rust-rustfft.git /var/lib/mock/f45-build-44561-815/root/chroot_tmpdir/scmroot/rust-rustfft
Cloning into '/var/lib/mock/f45-build-44561-815/root/chroot_tmpdir/scmroot/rust-rustfft'...
$ git fetch origin 2e0332d5c4b315c364af50f1fd2d2f01b6235160:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustfft
 * [new ref]         2e0332d5c4b315c364af50f1fd2d2f01b6235160 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e0332d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild