$ git clone -n https://src.fedoraproject.org/rpms/rust-env-lock.git /var/lib/mock/f45-build-41491-782/root/chroot_tmpdir/scmroot/rust-env-lock
Cloning into '/var/lib/mock/f45-build-41491-782/root/chroot_tmpdir/scmroot/rust-env-lock'...
$ git fetch origin 797b715bbe044aed163e7257d8fc477f2331b365:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-env-lock
 * [new ref]         797b715bbe044aed163e7257d8fc477f2331b365 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 797b715 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild