$ git clone -n https://src.fedoraproject.org/rpms/ghc-unix-compat.git /var/lib/mock/f40-build-742976-111005/root/chroot_tmpdir/scmroot/ghc-unix-compat
Cloning into '/var/lib/mock/f40-build-742976-111005/root/chroot_tmpdir/scmroot/ghc-unix-compat'...
$ git fetch origin acfc0da0b30785adf4441f8122a54656913a51dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-unix-compat
 * [new ref]         acfc0da0b30785adf4441f8122a54656913a51dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acfc0da https://hackage.haskell.org/package/unix-compat-0.7/changelog