$ git clone -n https://src.fedoraproject.org/rpms/goverlay.git /var/lib/mock/f39-build-1927380-43057/root/chroot_tmpdir/scmroot/goverlay
Cloning into '/var/lib/mock/f39-build-1927380-43057/root/chroot_tmpdir/scmroot/goverlay'...
$ git fetch origin fdd2cc1a832037911812dae81e7e348cc12d1780:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/goverlay
 * [new ref]         fdd2cc1a832037911812dae81e7e348cc12d1780 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fdd2cc1 build: Add BR: lazarus-lcl-qt5 (rh#2225909)