$ git clone -n https://src.fedoraproject.org/rpms/mum-hash.git /var/lib/mock/f39-build-1462285-33320/root/chroot_tmpdir/scmroot/mum-hash
Cloning into '/var/lib/mock/f39-build-1462285-33320/root/chroot_tmpdir/scmroot/mum-hash'...
$ git fetch origin b11ce57903691d97a9cc6ae55b72541aa1fc911d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mum-hash
 * [new ref]         b11ce57903691d97a9cc6ae55b72541aa1fc911d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b11ce57 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild