$ git clone -n https://src.fedoraproject.org/rpms/cosmic-workspaces.git /var/lib/mock/f41-build-858097-168310/root/chroot_tmpdir/scmroot/cosmic-workspaces
Cloning into '/var/lib/mock/f41-build-858097-168310/root/chroot_tmpdir/scmroot/cosmic-workspaces'...
$ git fetch origin b8a853f3a02f394d867318a87fcb93b4dbfa9fd6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-workspaces
 * [new ref]         b8a853f3a02f394d867318a87fcb93b4dbfa9fd6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8a853f "Update to 1.0.0~alpha.2"