$ git clone -n https://src.fedoraproject.org/rpms/golang-github-graylog2-gelf.git /var/lib/mock/f39-build-1503775-34985/root/chroot_tmpdir/scmroot/golang-github-graylog2-gelf
Cloning into '/var/lib/mock/f39-build-1503775-34985/root/chroot_tmpdir/scmroot/golang-github-graylog2-gelf'...
$ git fetch origin 7c528f3e89f8fa91d30135808baf5c4556118473:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-graylog2-gelf
 * [new ref]         7c528f3e89f8fa91d30135808baf5c4556118473 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c528f3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild