$ git clone -n https://src.fedoraproject.org/rpms/ostree-pin.git /var/lib/mock/f41-build-838615-159731/root/chroot_tmpdir/scmroot/ostree-pin
Cloning into '/var/lib/mock/f41-build-838615-159731/root/chroot_tmpdir/scmroot/ostree-pin'...
$ git fetch origin 96217a8f5212db1df1c0fa21d720c90a7f2e16a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ostree-pin
 * [new ref]         96217a8f5212db1df1c0fa21d720c90a7f2e16a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96217a8 bump release