$ git clone -n https://src.fedoraproject.org/rpms/ghc-websockets.git /var/lib/mock/f39-build-1929923-43099/root/chroot_tmpdir/scmroot/ghc-websockets
Cloning into '/var/lib/mock/f39-build-1929923-43099/root/chroot_tmpdir/scmroot/ghc-websockets'...
$ git fetch origin 9b014c6997e09aac5317a261659a4d3298339e9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-websockets
 * [new ref]         9b014c6997e09aac5317a261659a4d3298339e9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b014c6 revised .cabal file