$ git clone -n https://gitee.com/opencloudos-stream/perl-Mail-Message.git /var/lib/mock/dist-oc9-epol-build-94454-59557/root/chroot_tmpdir/scmroot/perl-Mail-Message
Cloning into '/var/lib/mock/dist-oc9-epol-build-94454-59557/root/chroot_tmpdir/scmroot/perl-Mail-Message'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-Mail-Message
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db81e18 update