$ git clone -n https://gitee.com/mgb01105731/imath.git /var/lib/mock/dist-an23-dde-build-426762-72605/root/chroot_tmpdir/scmroot/imath
Cloning into '/var/lib/mock/dist-an23-dde-build-426762-72605/root/chroot_tmpdir/scmroot/imath'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/imath
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e485e8 rebuild