$ git clone -n https://src.fedoraproject.org/rpms/ghc-union-find.git /var/lib/mock/f39-build-1713123-41228/root/chroot_tmpdir/scmroot/ghc-union-find
Cloning into '/var/lib/mock/f39-build-1713123-41228/root/chroot_tmpdir/scmroot/ghc-union-find'...
$ git fetch origin 466c4e59469d5adad9a23b515828f961c9a3bbdc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-union-find
 * [new ref]         466c4e59469d5adad9a23b515828f961c9a3bbdc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 466c4e5 fix build with ghc-9.4