$ git clone -n https://src.fedoraproject.org/rpms/golang-github-modern-concurrent.git /var/lib/mock/f40-build-2288395-55783/root/chroot_tmpdir/scmroot/golang-github-modern-concurrent
Cloning into '/var/lib/mock/f40-build-2288395-55783/root/chroot_tmpdir/scmroot/golang-github-modern-concurrent'...
$ git fetch origin 204a81e43bb62a70e5effc82ebb2e1f72a30dc5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-modern-concurrent
 * [new ref]         204a81e43bb62a70e5effc82ebb2e1f72a30dc5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 204a81e Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild