$ git clone -n https://src.fedoraproject.org/rpms/golang-github-modern-concurrent.git /var/lib/mock/f38-build-side-42-init-devel-625698-26368/root/chroot_tmpdir/scmroot/golang-github-modern-concurrent
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-625698-26368/root/chroot_tmpdir/scmroot/golang-github-modern-concurrent'...
$ git fetch origin bce62c23735885a8ee1ff5f99674b6ce320919c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-modern-concurrent
 * [new ref]         bce62c23735885a8ee1ff5f99674b6ce320919c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bce62c2 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild