$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-MailTools.git /var/lib/mock/dist-oc9-build-71242-47534/root/chroot_tmpdir/scmroot/perl-MailTools
Cloning into '/var/lib/mock/dist-oc9-build-71242-47534/root/chroot_tmpdir/scmroot/perl-MailTools'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-MailTools
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f451a8 import perl-MailTools-2.21-5.tl4