$ git clone -n https://src.fedoraproject.org/rpms/kwin.git /var/lib/mock/f40-build-1239460-22917/root/chroot_tmpdir/scmroot/kwin
Cloning into '/var/lib/mock/f40-build-1239460-22917/root/chroot_tmpdir/scmroot/kwin'...
$ git fetch origin 3b3be1619a2f0bdd9431855969c18c022466217c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kwin
 * [new ref]         3b3be1619a2f0bdd9431855969c18c022466217c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b3be16 Merge branch 'rawhide' into f40