$ git clone -n https://gitee.com/wency_cn/jbig2dec.git /var/lib/mock/dist-an23-build-502503-74802/root/chroot_tmpdir/scmroot/jbig2dec
Cloning into '/var/lib/mock/dist-an23-build-502503-74802/root/chroot_tmpdir/scmroot/jbig2dec'...
$ git fetch origin 4100783cec904203a6394c54d72cca7144c325c7:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/jbig2dec
 * [new ref]         4100783cec904203a6394c54d72cca7144c325c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4100783 Update code from upstream