$ git clone -n https://gitee.com/mgb01105731/ttmkfdir.git /var/lib/mock/dist-an23-build-338858-69766/root/chroot_tmpdir/scmroot/ttmkfdir
Cloning into '/var/lib/mock/dist-an23-build-338858-69766/root/chroot_tmpdir/scmroot/ttmkfdir'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/ttmkfdir
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc6cec9 rebuild