$ git clone -n https://src.fedoraproject.org/rpms/ghc-system-fileio.git /var/lib/mock/f31-build-101270-33376/root/chroot_tmpdir/scmroot/ghc-system-fileio
Cloning into '/var/lib/mock/f31-build-101270-33376/root/chroot_tmpdir/scmroot/ghc-system-fileio'...
$ git reset --hard 86f202867e0b325868f2a9986329264ab8dba3b2
HEAD is now at 86f2028 BR prof for lib and static for executable