$ git clone -n https://src.fedoraproject.org/rpms/rust-parking.git /var/lib/mock/f45-build-43701-805/root/chroot_tmpdir/scmroot/rust-parking
Cloning into '/var/lib/mock/f45-build-43701-805/root/chroot_tmpdir/scmroot/rust-parking'...
$ git fetch origin 1b3b5ae683fdca56d7a09a23c6a242d5dcc0e8dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-parking
 * [new ref]         1b3b5ae683fdca56d7a09a23c6a242d5dcc0e8dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b3b5ae Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild