$ git clone -n https://gitee.com/opencloudos-stream/perl-Cache-FastMmap.git /var/lib/mock/dist-oc9-epol-build-79786-53455/root/chroot_tmpdir/scmroot/perl-Cache-FastMmap
Cloning into '/var/lib/mock/dist-oc9-epol-build-79786-53455/root/chroot_tmpdir/scmroot/perl-Cache-FastMmap'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-Cache-FastMmap
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16f5b31 package init