$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtwebengine.git /var/lib/mock/f39-build-1589054-38230/root/chroot_tmpdir/scmroot/qt6-qtwebengine
Cloning into '/var/lib/mock/f39-build-1589054-38230/root/chroot_tmpdir/scmroot/qt6-qtwebengine'...
$ git fetch origin d5c3f17e705b79f7676bec02f6801550d5e73a08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtwebengine
 * [new ref]         d5c3f17e705b79f7676bec02f6801550d5e73a08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5c3f17 Move v8_context_snapshot file to correct subpackage