$ git clone -n https://src.fedoraproject.org/rpms/rust-pep440_rs.git /var/lib/mock/f45-build-43782-805/root/chroot_tmpdir/scmroot/rust-pep440_rs
Cloning into '/var/lib/mock/f45-build-43782-805/root/chroot_tmpdir/scmroot/rust-pep440_rs'...
$ git fetch origin 68c76f0e171867fe5486b2fb0e988a21337eb472:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pep440_rs
 * [new ref]         68c76f0e171867fe5486b2fb0e988a21337eb472 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68c76f0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild