$ git clone -n https://src.fedoraproject.org/rpms/rust-tls_codec_derive.git /var/lib/mock/f45-build-45446-823/root/chroot_tmpdir/scmroot/rust-tls_codec_derive
Cloning into '/var/lib/mock/f45-build-45446-823/root/chroot_tmpdir/scmroot/rust-tls_codec_derive'...
$ git fetch origin b6d078a9ec10bde3d05a37097ec43cba0c54467e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tls_codec_derive
 * [new ref]         b6d078a9ec10bde3d05a37097ec43cba0c54467e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6d078a initial import (resolves rhbz#2487074)