$ git clone -n https://src.fedoraproject.org/rpms/qt5-qtx11extras.git /var/lib/mock/f38-build-711684-94096/root/chroot_tmpdir/scmroot/qt5-qtx11extras
Cloning into '/var/lib/mock/f38-build-711684-94096/root/chroot_tmpdir/scmroot/qt5-qtx11extras'...
$ git fetch origin 00a38b1b3363f19d0a2fb7fb990d4439946f3810:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5-qtx11extras
 * [new ref]         00a38b1b3363f19d0a2fb7fb990d4439946f3810 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00a38b1 5.15.9