$ git clone -n https://gitee.com/src-opencloudos-rpms/btrfs-progs.git /var/lib/mock/dist-oc9-build-120573-71374/root/chroot_tmpdir/scmroot/btrfs-progs
Cloning into '/var/lib/mock/dist-oc9-build-120573-71374/root/chroot_tmpdir/scmroot/btrfs-progs'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/btrfs-progs
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a51568 import btrfs-progs-6.0.1-7.tl4