$ git clone -n https://src.fedoraproject.org/rpms/unixcw.git /var/lib/mock/f41-build-side-1-2887645-34540/root/chroot_tmpdir/scmroot/unixcw
Cloning into '/var/lib/mock/f41-build-side-1-2887645-34540/root/chroot_tmpdir/scmroot/unixcw'...
$ git fetch origin 156ebca830eb1e72621f453124a0e05116521bf2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unixcw
 * [new ref]         156ebca830eb1e72621f453124a0e05116521bf2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 156ebca convert GPLv2+ license to SPDX