$ git clone -n https://src.fedoraproject.org/rpms/golang-github-cockroachdb-cmux.git /var/lib/mock/f38-build-side-42-init-devel-568669-25905/root/chroot_tmpdir/scmroot/golang-github-cockroachdb-cmux
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-568669-25905/root/chroot_tmpdir/scmroot/golang-github-cockroachdb-cmux'...
$ git fetch origin c53b4fe9e10db88ede042147f8b05bb20edbdf0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-cockroachdb-cmux
 * [new ref]         c53b4fe9e10db88ede042147f8b05bb20edbdf0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c53b4fe Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild