$ git clone -n https://src.fedoraproject.org/rpms/rust-mock_instant.git /var/lib/mock/f45-build-43263-801/root/chroot_tmpdir/scmroot/rust-mock_instant
Cloning into '/var/lib/mock/f45-build-43263-801/root/chroot_tmpdir/scmroot/rust-mock_instant'...
$ git fetch origin 90d30c44ecd7fc95cf6e149578264fb838f23d8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mock_instant
 * [new ref]         90d30c44ecd7fc95cf6e149578264fb838f23d8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90d30c4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild