$ git clone -n https://src.fedoraproject.org/rpms/xmpcore.git /var/lib/mock/f38-build-side-42-init-devel-593573-26155/root/chroot_tmpdir/scmroot/xmpcore
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-593573-26155/root/chroot_tmpdir/scmroot/xmpcore'...
$ git fetch origin 562bb9083bd580d802971bb6dae40a494cecedd6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmpcore
 * [new ref]         562bb9083bd580d802971bb6dae40a494cecedd6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 562bb90 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild