$ git clone -n https://src.fedoraproject.org/rpms/ghc-turtle.git /var/lib/mock/f39-test-2569123-62233/root/chroot_tmpdir/scmroot/ghc-turtle
Cloning into '/var/lib/mock/f39-test-2569123-62233/root/chroot_tmpdir/scmroot/ghc-turtle'...
$ git fetch origin fbb9966575c7f1f0ab278a64a5342af02baaf79f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-turtle
 * [new ref]         fbb9966575c7f1f0ab278a64a5342af02baaf79f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbb9966 https://hackage.haskell.org/package/turtle-1.6.1/changelog