$ git clone -n https://src.fedoraproject.org/rpms/golang-github-cockroachdb-cmux.git /var/lib/mock/f39-build-1988017-43354/root/chroot_tmpdir/scmroot/golang-github-cockroachdb-cmux
Cloning into '/var/lib/mock/f39-build-1988017-43354/root/chroot_tmpdir/scmroot/golang-github-cockroachdb-cmux'...
$ git fetch origin 664bbe321236abb48fb8e778b4bca78c136fd174:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-cockroachdb-cmux
 * [new ref]         664bbe321236abb48fb8e778b4bca78c136fd174 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 664bbe3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild