$ git clone -n https://src.fedoraproject.org/rpms/xmountains.git /var/lib/mock/f38-build-side-42-init-devel-1229551-30640/root/chroot_tmpdir/scmroot/xmountains
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1229551-30640/root/chroot_tmpdir/scmroot/xmountains'...
$ git fetch origin 9fea20afc674716f16e5c2066ae10b5806f6531f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmountains
 * [new ref]         9fea20afc674716f16e5c2066ae10b5806f6531f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9fea20a Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild