$ git clone -n https://gitee.com/xht8015/libdb.git /var/lib/mock/dist-an23-build-480092-74220/root/chroot_tmpdir/scmroot/libdb
Cloning into '/var/lib/mock/dist-an23-build-480092-74220/root/chroot_tmpdir/scmroot/libdb'...
$ git fetch origin 21a92abeeb1e09c350dfd86555cf9c0184397a48:KOJI_FETCH_HEAD
From https://gitee.com/xht8015/libdb
 * [new ref]         21a92abeeb1e09c350dfd86555cf9c0184397a48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21a92ab Add support for riscv64