$ git clone -n https://src.fedoraproject.org/rpms/kwin.git /var/lib/mock/f39-build-1899427-42822/root/chroot_tmpdir/scmroot/kwin
Cloning into '/var/lib/mock/f39-build-1899427-42822/root/chroot_tmpdir/scmroot/kwin'...
$ git fetch origin a775cc3814431fc2513f0a11599a265c1ad1bae3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kwin
 * [new ref]         a775cc3814431fc2513f0a11599a265c1ad1bae3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a775cc3 Backport proposed patch to fix nvidia screencasting