$ git clone -n https://src.fedoraproject.org/rpms/rust-tonic-build.git /var/lib/mock/f41-build-side-1-2983965-35892/root/chroot_tmpdir/scmroot/rust-tonic-build
Cloning into '/var/lib/mock/f41-build-side-1-2983965-35892/root/chroot_tmpdir/scmroot/rust-tonic-build'...
$ git fetch origin 28ef33ff74d11d8e17c6ced0a9b1232d4e00e582:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tonic-build
 * [new ref]         28ef33ff74d11d8e17c6ced0a9b1232d4e00e582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28ef33f Update to version 0.12.3