$ git clone -n https://gitee.com/mgb01105731/coreutils.git /var/lib/mock/dist-an27-build-529925-80163/root/chroot_tmpdir/scmroot/coreutils
Cloning into '/var/lib/mock/dist-an27-build-529925-80163/root/chroot_tmpdir/scmroot/coreutils'...
$ git fetch origin a27:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/coreutils
 * [new branch]      a27        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab44888 Add source files