$ git clone -n https://src.fedoraproject.org/rpms/golang-x-sync.git /var/lib/mock/f40-build-2002986-44784/root/chroot_tmpdir/scmroot/golang-x-sync
Cloning into '/var/lib/mock/f40-build-2002986-44784/root/chroot_tmpdir/scmroot/golang-x-sync'...
$ git fetch origin d6fb848246c77fcc9be80fd6786f89a05380a804:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-x-sync
 * [new ref]         d6fb848246c77fcc9be80fd6786f89a05380a804 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6fb848 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild