$ git clone -n https://src.fedoraproject.org/rpms/cosmic-osd.git /var/lib/mock/f41-build-side-1-3123105-39473/root/chroot_tmpdir/scmroot/cosmic-osd
Cloning into '/var/lib/mock/f41-build-side-1-3123105-39473/root/chroot_tmpdir/scmroot/cosmic-osd'...
$ git fetch origin b062a3b419b211c4059be29d3c85f555578e5616:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-osd
 * [new ref]         b062a3b419b211c4059be29d3c85f555578e5616 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b062a3b "Update to 1.0.0~alpha.3"