$ git clone -n https://gitee.com/opencloudos-stream/perl-Mail-Box.git /var/lib/mock/dist-oc9-epol-build-94452-59557/root/chroot_tmpdir/scmroot/perl-Mail-Box
Cloning into '/var/lib/mock/dist-oc9-epol-build-94452-59557/root/chroot_tmpdir/scmroot/perl-Mail-Box'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-Mail-Box
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed7147b update