$ git clone -n https://src.fedoraproject.org/rpms/golang-github-tj-buffer.git /var/lib/mock/f38-build-side-42-init-devel-960551-28791/root/chroot_tmpdir/scmroot/golang-github-tj-buffer
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-960551-28791/root/chroot_tmpdir/scmroot/golang-github-tj-buffer'...
$ git fetch origin c21e306b6469d6559bb6207b9b98afc18f4621b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-tj-buffer
 * [new ref]         c21e306b6469d6559bb6207b9b98afc18f4621b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c21e306 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild