$ git clone -n https://src.fedoraproject.org/rpms/gap-pkg-jupyterkernel.git /var/lib/mock/f38-build-side-42-init-devel-623107-26358/root/chroot_tmpdir/scmroot/gap-pkg-jupyterkernel
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-623107-26358/root/chroot_tmpdir/scmroot/gap-pkg-jupyterkernel'...
$ git fetch origin 6c5e639e3d48976e1328837c52fc6161442894e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gap-pkg-jupyterkernel
 * [new ref]         6c5e639e3d48976e1328837c52fc6161442894e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c5e639 Version 1.5.0.