$ git clone -n https://src.fedoraproject.org/rpms/rust-prost-build.git /var/lib/mock/f38-build-side-42-init-devel-1394898-31050/root/chroot_tmpdir/scmroot/rust-prost-build
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1394898-31050/root/chroot_tmpdir/scmroot/rust-prost-build'...
$ git fetch origin 907237cebca9c3b2e2185a7672a03ff3d7ed9e0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prost-build
 * [new ref]         907237cebca9c3b2e2185a7672a03ff3d7ed9e0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 907237c Regenerate with rust2rpm v24; simplify packaging; enable tests