$ git clone -n https://gitee.com/bbrucezhang/xrootd.git /var/lib/mock/dist-oc9-epol-build-232452-81744/root/chroot_tmpdir/scmroot/xrootd
Cloning into '/var/lib/mock/dist-oc9-epol-build-232452-81744/root/chroot_tmpdir/scmroot/xrootd'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/bbrucezhang/xrootd
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f644192 fix