$ git clone -n https://gitee.com/opencloudos-stream/perl-Contextual-Return.git /var/lib/mock/dist-oc9-epol-build-93421-59429/root/chroot_tmpdir/scmroot/perl-Contextual-Return
Cloning into '/var/lib/mock/dist-oc9-epol-build-93421-59429/root/chroot_tmpdir/scmroot/perl-Contextual-Return'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/perl-Contextual-Return
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdb0f7f package init