$ git clone -n https://gitee.com/src-opencloudos-rpms/perl-Mail-DKIM /var/lib/mock/dist-oc8-build-57065-15217/root/chroot_tmpdir/scmroot/perl-Mail-DKIM
Cloning into '/var/lib/mock/dist-oc8-build-57065-15217/root/chroot_tmpdir/scmroot/perl-Mail-DKIM'...
$ git fetch origin oc8:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/perl-Mail-DKIM
 * [new branch]      oc8        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 52af513 import perl-Mail-DKIM-1.20200907-1.tl3