$ git clone -n https://gitee.com/opencloudos-stream/perl-VM-EC2.git /var/lib/mock/dist-oc9-epol-build-94878-59571/root/chroot_tmpdir/scmroot/perl-VM-EC2
Cloning into '/var/lib/mock/dist-oc9-epol-build-94878-59571/root/chroot_tmpdir/scmroot/perl-VM-EC2'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-VM-EC2
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a3c1a3 update