$ git clone -n https://src.fedoraproject.org/rpms/xmlstreambuffer.git /var/lib/mock/f38-build-side-42-init-devel-688458-26776/root/chroot_tmpdir/scmroot/xmlstreambuffer
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-688458-26776/root/chroot_tmpdir/scmroot/xmlstreambuffer'...
$ git fetch origin 6d173bc975e1c0167f70ce9a4d4c5998c5ec1743:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlstreambuffer
 * [new ref]         6d173bc975e1c0167f70ce9a4d4c5998c5ec1743 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6d173bc Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild