$ git clone -n https://gitee.com/mgb01105731/bzip2.git /var/lib/mock/dist-an27-build-529932-80163/root/chroot_tmpdir/scmroot/bzip2
Cloning into '/var/lib/mock/dist-an27-build-529932-80163/root/chroot_tmpdir/scmroot/bzip2'...
$ git fetch origin a27:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/bzip2
 * [new branch]      a27        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b4b182 Add source files