$ git clone -n https://gitee.com/alpha-wang/libunwind.git /var/lib/mock/dist-an8.9-build-417587-72835/root/chroot_tmpdir/scmroot/libunwind
Cloning into '/var/lib/mock/dist-an8.9-build-417587-72835/root/chroot_tmpdir/scmroot/libunwind'...
$ git fetch origin 27ace517c0077ba3bc6970423f06d0598a325c91:KOJI_FETCH_HEAD
From https://gitee.com/alpha-wang/libunwind
 * [new ref]         27ace517c0077ba3bc6970423f06d0598a325c91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27ace51 update to libunwind-1.3.1-3.src.rpm