$ git clone -n https://src.fedoraproject.org/rpms/xapian-bindings.git /var/lib/mock/f39-build-1559243-37321/root/chroot_tmpdir/scmroot/xapian-bindings
Cloning into '/var/lib/mock/f39-build-1559243-37321/root/chroot_tmpdir/scmroot/xapian-bindings'...
$ git fetch origin adcd95a78aa6d1bde506fa8217bf6e91a8ef46f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xapian-bindings
 * [new ref]         adcd95a78aa6d1bde506fa8217bf6e91a8ef46f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at adcd95a 1.4.23