$ git clone -n https://src.fedoraproject.org/rpms/ghc-gtk.git /var/lib/mock/f39-build-1712149-41228/root/chroot_tmpdir/scmroot/ghc-gtk
Cloning into '/var/lib/mock/f39-build-1712149-41228/root/chroot_tmpdir/scmroot/ghc-gtk'...
$ git fetch origin 0fe81cafdd742dc51d441a60016d3643367f64c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gtk
 * [new ref]         0fe81cafdd742dc51d441a60016d3643367f64c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fe81ca https://hackage.haskell.org/package/gtk-0.15.8/changelog