$ git clone -n https://src.fedoraproject.org/rpms/rust-nanoserde-derive.git /var/lib/mock/f45-build-43302-801/root/chroot_tmpdir/scmroot/rust-nanoserde-derive
Cloning into '/var/lib/mock/f45-build-43302-801/root/chroot_tmpdir/scmroot/rust-nanoserde-derive'...
$ git fetch origin 3519e387f2cdf4a9b618a4a5dff62bbad96a8bda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nanoserde-derive
 * [new ref]         3519e387f2cdf4a9b618a4a5dff62bbad96a8bda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3519e38 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild