$ git clone -n https://gitee.com/opencloudos-stream/perl-Sys-Mmap.git /var/lib/mock/dist-oc9-epol-build-77391-52768/root/chroot_tmpdir/scmroot/perl-Sys-Mmap
Cloning into '/var/lib/mock/dist-oc9-epol-build-77391-52768/root/chroot_tmpdir/scmroot/perl-Sys-Mmap'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-Sys-Mmap
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b040435 package init