$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtwebengine.git /var/lib/mock/f43-build-59040142-6570541/root/chroot_tmpdir/scmroot/qt6-qtwebengine
Cloning into '/var/lib/mock/f43-build-59040142-6570541/root/chroot_tmpdir/scmroot/qt6-qtwebengine'...
$ git fetch origin 1b504add43c2002a2f3ed6d7053a73b8f992795d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtwebengine
 * [new ref]         1b504add43c2002a2f3ed6d7053a73b8f992795d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b504ad global define all optional system libs, enable XFA