$ git clone -n https://src.fedoraproject.org/rpms/rubygem-slim.git /var/lib/mock/f38-build-side-42-init-devel-583576-26087/root/chroot_tmpdir/scmroot/rubygem-slim
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-583576-26087/root/chroot_tmpdir/scmroot/rubygem-slim'...
$ git fetch origin dbf752ed64352c47818d293e8ba5d3ec4db9d7eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-slim
 * [new ref]         dbf752ed64352c47818d293e8ba5d3ec4db9d7eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbf752e Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild